Deep Ring Research Articles

Topology-adaptive Bayesian optimization for deep ring echo state networks in speech emotion recognition

Topology-adaptive Bayesian optimization for deep ring echo state networks in speech emotion recognition

Case of large spermatic cord lipoma misdiagnosed as inguinal hernia

Clinically, a pure spermatic cord lipoma has not been recognized as a disease entity but regarded as an incidental finding at the time of hernia repair because it presents as groin symptoms and clinical findings are indistinguishable from those of inguinal hernia. We report the successful treatment of case of huge pure spermatic cord lipoma originally misdiagnosed as inguinal hernia. A 65year male patient presented with progressive swelling, on and off pain in left groin in the last 2 years. On examination it was partially reducible and ultrasonographic scan was showing as inguinal hernia. We proceeded for an open hernia repair, unexpectedly it revealed a large fatty mass attached to spermatic cord and there is no connection to peritoneal cavity near deep ring. Then it is excised and Lichtenstein tension free hernioplasty was done to prevent future development of hernia. Histopathological examination of excised specimen confirmed it is a lipoma of cord.

WP1.5 - Outcomes of inguinal hernia repair in adolescents by both paediatric and adult surgeons- a retrospective observational study

Abstract Aims Adolescent inguinal herniae are repaired by both paediatric and adult surgeons, but there is significant variation in operative technique. We aim to report both adult and paediatric practice, and to compare outcomes amongst different repair techniques. Methods Data were collected from records of patients aged 12-18 who underwent inguinal hernia repair in adult or paediatric services within our region between 2000 and 2023. Results 116 inguinal herniae in 106 adolescents were identified. 66% were repaired by paediatric surgeons. 85% were male. Median age was 14.1 years. Median length of follow-up was 15.0 years. 71% herniae were right-sided and 9% bilateral. 98% were indirect. 3% were incarcerated. 72% underwent open repair. Herniotomy with high ligation of the sac was the most common open operation in adult and paediatric practice. 28% herniae were repaired laparoscopically (64% by adult surgeons). Adult surgeons most commonly utilised total extraperitoneal repair, and paediatric surgeons most utilised closure of the deep ring. 4% recurred (all operated on by paediatric surgeons). 4% of patients developed chronic pain (80% from adult services). Only 1 of 5 patients with chronic pain had mesh repair. Logistic regression showed no independent variables predictive for recurrence or chronic pain. Conclusions There is significant variation in practice between adult and paediatric surgeons in adolescents with inguinal herniae. Recurrence was more common after repair by paediatric surgeons whilst post-operative chronic pain was less common. Paediatric and adult surgeons could learn from each other to optimise outcomes. This study also raises the question of who should be doing these procedures.

Retinal microvascular changes in patients with pancreatitis and their clinical significance

Acute pancreatitis, a common exocrine inflammatory disease affecting the pancreas, is characterized by intense abdominal pain and multiple organ dysfunction. However, the alterations in retinal blood vessels among individuals with acute pancreatitis remain poorly understood. This study employed optical coherence tomography angiography (OCTA) to examine the superficial and deep retinal blood vessels in patients with pancreatitis. Sixteen patients diagnosed with pancreatitis (32 eyes) and 16 healthy controls (32 eyes) were recruited from the First Affiliated Hospital of Nanchang University for participation in the study. Various ophthalmic parameters, such as visual acuity, intraocular pressure, and OCTA image for retina consisting of the superficial retinal layer (SRL) and the deep retinal layer (DRL), were recorded for each eye. The study observed the superficial and deep retinal microvascular ring (MIR), macrovascular ring (MAR), and total microvessels (TMI) were observed. Changes in retinal vascular density in the macula through annular partitioning (C1–C6), hemispheric quadrant partitioning (SR, SL, IL, and IR), and early diabetic retinopathy treatment studies (ETDRS) partitioning methods (R, S, L, and I). Correlation analysis was employed to investigate the relationship between retinal capillary density and clinical indicators. Our study revealed that in the superficial retinal layer, the vascular density of TMI, MIR, MAR, SR, IR, S, C2, C3 regions were significantly decreased in patients group compared with the normal group. For the deep retinal layer, the vascular density of MIR, SR, S, C1, C2 regions also reduced in patient group. The ROC analysis demonstrated that OCTA possesses significant diagnostic performance for pancreatitis. In conclusion, patients with pancreatitis may have retinal microvascular dysfunction, and OCTA can be a valuable tool for detecting alterations in ocular microcirculation in pancreatitis patients in clinical practice.

Abdominoscrotal Hydrocele - Considerations.

The aim of the study was to highlight the pathology, clinical spectrum, and approach considerations in abdominoscrotal hydrocele (ASH). Our study included eight children with ASH from 2015 to 2022. The demographics, clinical presentation, investigations, operative details, and postoperative outcome were collected retrospectively from case files. The age of presentation ranged from 11 months to 2½ years. Six lesions were on the right side and two were on the left side. One child presented with an acute scrotum and underwent emergency inguinal exploration, revealing hemorrhagic fluid after trauma. Others presented with tense inguinoscrotal swelling, which was fully reducible but refilled promptly after emptying. Preoperative ultrasound showed the abdominal component in 50%, while others were detected intraoperatively. All of them were approached inguinally, and the hydrocele sac was traced proximally to the abdominal component through the internal ring. This was drained and a partial excision of the extraperitoneal sac was done. An additional patent processus vaginalis (PPV) was identified in 87%, dissected up to the deep ring, and ligated. On follow-up, there was no recurrence. ASH is an uncommon condition that should be identified and dealt with appropriately. Physical examination and ultrasonography are usually sufficient for diagnosis. The inguinal approach is a safe, simple method and an extension of the standard operation for the hydrocele. One must keep in mind to explore for an additional narrow PPV to prevent the recurrence of hydrocele.

Crypto Deep Ring Topology Firewall in Sensitive Data Transmission and Retrieval in Cloud

The data transmission and data retrieval process from the cloud is a critical issue because of cyber‐attacks. The data in the cloud is highly vulnerable and may fall prey to hackers. The hackers tend to attack the data in the public network, deteriorating the range of confidentiality and the authentication of the data. To prevent this attack on the cloud data, this manuscript proposes a crypto deep ring topology firewall to protect the cloud from data breaches. The data transmission has been performed using egress ring topology crypto encryption that solves the difficulty in isolating the traffic path between the edge and cloud network. Moreover, during the cloud data retrieval, the data interoperability issue arises due to the improper cloud service level agreement, which is solved using an application programing interface firewall fetch intrusion prevention system used in the secure transmission technique in which the data are entered into the transport and session layer of the firewall and then into the intrusion detection and prevention system thus sieving of data is carried out to solve the amenability violation of the cloud network and eliminate data interoperability issue. The proposed model was implemented in the Python platform and provided an enhanced level of encryption and decryption performance than the existing cloud retrieval model, producing high access speed to the cloud network with data security. The proposed work has proved to be highly robust against cyber attacks like man‐in‐the‐middle attacks and spoofing attacks.

P-036 SUTURING OF THE INTERNAL INGUINAL ORIFICE DURING THE LAPAROSCOPIC TRANSABDOMINAL REPAIR OF A LARGE INDIRECT INGUINAL HERNIA

Abstract Aim To present the rationale and surgical technique of the internal inguinal orifice suturing during transabdominal preperitoneal hernia repair of large inguinal hernias. Methods The surgical steps of a laparoscopic transabdominal preperitoneal hernia repair (TAPP) with the addition of the suturing reconstruction of the internal orifice are presented. Results A 52-year-old man presented with a large symptomatic right inguinal hernia. A TAPP repair was performed. Due to a significantly widened internal inguinal orifice, reconstruction of the deep ring was performed by suturing the transversalis fascia arc to the iliopubic tract with a self-locking 2-0 stitch in a continuous fashion. Accordingly, a medium-weighted polyester mesh was applied. The patient had an uneventful postoperative period, without symptoms of chronic pain or discomfort at a 6-month follow-up. Conclusions During the laparoscopic repair of large indirect inguinal hernias, suturing reconstruction of the internal orifice, similar to the common practice for open inguinal hernia repair, may reduce mesh eventration and recurrence.

P-004 APPENDICITIS CAUSING CHRONIC MESH INFECTION: A CASE SERIES OF TWO PATIENTS

Abstract Aim To discuss appendicitis as a cause of chronic mesh infection. Methods This study reports two patients with previous inguinal hernia repair who presented with recurrent groin infections resulting from appendicitis. Results Patient 1 had a history of laparoscopic bilateral inguinal hernia repair, followed by an open repair of a unilateral recurrence. He presented twice with groin pain and discharge. Sinugram demonstrated a superficial tract, but intra-operatively the sinus tract extended to the deep ring where the appendix was adherent and inflamed. There was also a meshoma of the preperitoneal mesh. He underwent appendicectomy and excision of meshoma. Patient 2 presented with perforated appendicitis with a large pelvic collection extending into the anterior abdominal wall. This was treated with percutaneous drainage and antibiotics. Further presentations with recurrent abscesses prompted a laparoscopy where an inflamed appendix was found adherent to the previous mesh through a hole in the peritoneum in a pre-peritoneal abscess cavity. He underwent appendicectomy and washout without mesh removal. Both patients remain symptom free at 10 months and 1 month respectively. Conclusion Literature review found reports of mesh-related appendicitis but no cases of appendicitis causing chronic mesh infection. Whilst rare, appendicitis causing chronic mesh infection should be considered in patients presenting with recurrent groin pain and abscesses having previously undergone inguinal hernia repair. Whilst we do not have long term follow up data, our experience indicates that these patients can be managed with or without mesh removal, providing the appendix is removed and the source of sepsis controlled.

CAUSES OF INGUINAL HERNIAS RECURRENCE DURING THE LIECHTENSTEIN OPERATION

Numerous methods of plastic surgery of inguinal hernias with own tissues, which were developed by surgeons, gave relapses up to 35%. A large number of relapses in the treatment of inguinal hernias with tension methods forced surgeons to look for new ways to solve this problem.
 Without pathological changes in the deep inguinal ring, a hernia cannot occur, and this leads to the conclusion that all existing methods, which are aimed at strengthening only the front wall of the inguinal canal, are pathogenetically unfounded and often a recurrence of the hernia can be expected.
 Therefore, a justified operation for various types of inguinal hernia is the strengthening of the deep ring and the back wall of the inguinal canal.
 Changing the concept of the approach to the treatment of inguinal hernias should be aimed at minimizing trauma and take into account the pathogenetic features of the development of hernias.
 The reason for the development of inguinal hernias is expansion, destruction, functional insufficiency of deep inguinal openings: medial and lateral.
 The back wall of the inguinal canal does not have a protective function when intraperitoneal pressure increases and cannot resist hernia formation. At the same time, its weakening, destruction can contribute to the increase of the internal inguinal opening. Although we did not come across any publication that gave an example of a hernia exiting directly through the back wall of the inguinal canal.
 Based on our own clinical experience, as well as the processing of a large number of literary sources, we offer a modified type of Lichtenstein's operation in the following interpretation: a typical incision of the skin and subcutaneous tissue with the opening of the aponeurosis of the external oblique abdominal muscle; mobilization of the spermatic cord; mobilization of the hernia sac, its opening, stitching at the base and removal. With a direct inguinal hernia, if the bag is small, there is no need to remove it. Revision of the internal inguinal ring in case of an oblique hernia and, if necessary, sewing it to the required size (the tip of the little finger should pass between the cord and the ring).
 Revision of the medial deep ring in direct inguinal hernia and its suturing "tightly" over the hernial protrusion.
 Prepare a mesh implant so that its dimensions cover both deep holes, dissect it according to our proposed method. Fix the net to the deep ring using the described method. Sew the lower part of the mesh with an overlap of 1-1.5 cm to the pubic bone, fix the lateral edge of the implant to the pubic ligament with a wrapping suture or knotted single sutures.
 Above the spermatic cord, the legs of the dissected implant are sewn together and sewn to the aponeurosis of the external oblique muscle of the abdomen from below.
 The medial edge of the mesh is sewn to the internal oblique muscle and to the aponeurosis of the external oblique muscle in the manner described above.
 The middle part of the mesh is fixed to the sewn medial deep inguinal ring and to the middle of the inguinal canal with separate knotted stitches. We lay the spermatic cord on the mesh, over which we sew the aponeurosis of the external oblique muscle of the abdomen, subcutaneous tissue and skin.
 In our opinion, the method of surgery proposed by us for direct and oblique inguinal hernias is the most optimal, minimally traumatic, which best meets the modern requirements of the pathogenesis of the disease. But even this method of plastic inguinal hernias is not ideal and needs constant improvement.

Incidentally found Bilaterally Occult Femoral Hernia during Transabdominal Preperitoneal Inguinal Hernia Repair: A Case Report

Hernia is defined as an area of anatomical weakness or an abnormal protrusion of a viscous or a part of a viscous through an opening, covering it. Inguinal hernia is the most common hernia because of the presence of natural weakness like the deep ring and cord structures. The minimally invasive procedures for inguinal hernia repair include Intraperitoneal Onlay Mesh (IPOM) repair, Transabdominal Preperitoneal Repair (TAPP), and Total Extraperitoneal (TEP) repair. Laparoscopic inguinal hernia repair has the advantage of inspecting the entire myopectineal orifice, as it allows for the identification of bilateral or recurrent hernias. The principle behind laparoscopic repair includes strengthening of myopectineal orifice in all the above approaches. TAPP repair is mainly indicated for large indirect hernias or irreducible hernia. TEP repair is technically challenging to perform and has the advantage of avoiding interbowel adhesions as the peritoneum is not opened. IPOM repair is not routinely performed but has advantages in cases where there is an increased risk of spermatic cord injury seen in patients with a history of lower abdominal irradiation or a history of multiple recurrent hernia surgery. Occult contralateral inguinal hernia and the occult femoral hernia can be easily diagnosed and repaired with no extra incisions while performing TAPP repair. These hernias, if left untreated may present as recurrent hernias or as non resolution of symptoms posthernia surgery. A rare case of bilateral occult femoral hernia found during laparoscopic TAPP repair of an inguinal hernia was reported. The entire myopectineal orifice was repaired using the same mesh with no extra risk or cost.

Duplication of the internal maxillary artery: Anatomical and clinical considerations.

Duplication of the internal maxillary artery (IMAX) results from a failed regression of either the embryological superficial or deep ring and is reported to be exceedingly rare. We present a patient with this rare anatomical variant who was treated by endovascular technique in the clinical context of an acute oropharyngeal hemorrhage.

A clinical study on groin hernias presenting as acute emergencies in a tertiary care hospital

Background: Inguinal hernias are the most common hernias encountered in the surgical practice. A small section of cases present to the emergency with certain complications at time of presentation. Complications like irreducibility, obstruction and strangulation occur which require immediate management. Aim of this study is to study groin hernias presenting as emergencies and their surgical management. Materials and Methods: This study was a prospective observational study, conducted in the Department of General Surgery, Rangaraya Medical College and Hospital, during May 2021 to May 2022(1 Years). The study population is 50 patients.Results: The incidence of hernia is more common in the age group consisting 60-70 years (34%). The incidence at the age group 51-60 years is 22%.The frequency of hernia in males is greater than females. Incidence in males is 98% and 2% in females. The duration of hernia before the acute episode is more common in the first year. Complications were more common on the right side than the left side. The common site of constriction is at the internal ring. The duration of hernia before the acute episode is more common in the first year. Complications were more common on the right side than the left side. The common site of constriction is at the internal ring. Pain is universal in all patients. Pain and irreducibility were present in the frequency of 50 patients. Constipation was found in 36 patients and fever was present in 16 cases respectively. Complications like obstruction which were present in 64% of cases. Pain and irreducibility were present in 22% of cases. Strangulation was seen in 14% of the cases. Optimum procedure done was herniorrhaphy in 84% of cases. Resection and anastomosis was done in 6% of the cases. Omentectomy was done in 3% of the cases.Conclusion: The most common age group of presentation is 51 to 60 years. It is more common in male sex group. Pain and irreducibility were universal. The incidence of complications were common in the first year of presentation. The most common site of constriction is the deep ring followed by superficial and femoral canal. Pain and irreducibility were universal. Herniorrhaphy was done universally for all cases with resection and anastomosis of gangrenous bowel and omentectomy as adjunctive procedures.

Undescended Testis Revealing Triorchidism in a Child: A Case Report

Polyorchidism is a rare genitourinary congenital malformation, which diagnosis is generally fortuitous in children. We report the case of a 7-year-old boy admitted to the pediatric surgery service of Donka University Hospital in Conakry for an empty left scrotum. Initially, the diagnosis of left cryptorchidism had prompted orchidopexy by inguinal approach, whose intraoperative exploration revealed two undescended left testicles. The first, located at the deep ring of the inguinal canal, had normal volume, while the second, located in the inguinal canal, was hypotrophic. The orchiectomy of the latter was performed, associated with a dartos-pouch orchidopexy of the testicle of normal volume. After one year of follow-up, no complications were noted.

Hydrocele in the canal of nuck in a young female: a rare case report

Hydrocele of the canal of Nuck is a rare condition seen in younger females which is an extension of the peritoneum into the inguinal canal. Incomplete proximal obliteration and collection of serous fluid in the sac leads to the formation of a hydrocele of the canal of Nuck. A 28-year-old woman presented with swelling in her right groin for 5 months of 6cm × 5 cm. Ultrasound revealed a well-defined tubular cystic structure, measuring 5 cm × 3.5 cm × 5 cm with a volume of 50–60 ml. The cyst was dissected and the neck of the sac was extended up to the deep ring. Clear fluid was found on opening the sac. Clinically, it appears either as a painless or a moderately painful fluctuant inguinal mass. Clinical findings alone do not help in diagnosing the disease. Treatment includes surgical excision of the mass but without puncturing it as aspiration is inadequate and results in recurrence.

Direct mapping and characterization of the surface local field in InGaAs/InP avalanche photodetectors

In this paper, InGaAs/InP avalanche photodetectors with a variety of guard ring structures are investigated. The electric distribution in the device is characterized by experiment and simulation methods to better understand the dark current mechanisms. It is found that deeper guard rings are more effective in preventing edge breakdown for the depressed lateral electric field. Scanning photocurrent microscopy measurement is used to characterize the effect of guard ring on InP layer. Our results show that deep guard ring design can reduce the surface electric field. In addition, the 1550 nm response distribution of optimized photodetectors under different operating modes is measured and compared. It shows guard ring can inhibit the edge breakdown. This work demonstrates the significance of guard ring designs of InGaAs/InP avalanche photodetectors, and the characterization method will provide an effective way to understand the source of the current generation mechanism.

Clinical Presentation, Diagnostic Approach, Laparoscopic Evaluation and Treatment of Impalpable Testis.

To find out the clinical presentation, utility of ultrasound for diagnosis, laparoscopic findings and treatment for clinically impalpable testis. Cross-sectional study. Department of Paediatric Surgery, National Institute of Child Health, Jinnah Sindh Medical University Karachi, from September 2019 to April 2020. Patients with clinically impalpable testis were included. Ultrasound of inguinal region was done to locate testis. Presence of testis and its position was confirmed at laparoscopy and surgical procedure done according to the findings. Data was stratified according to the age and Chi-square test and Student t-test were applied to find out statistical significance among different variables in children below and above five years of age. A p <0.05 was taken as significant. Ninety-one patients with 113 testes were included. The median age of the children was 48 months. Sixty-nine (75.8%) patients had unilateral undescended testis and 22 (24.2%) bilateral undescended testes. Fifty-three (58.2%) patients were less than five years of age. On ultrasound, testis was found near deep ring in 23 (25.3%) patients. At laparoscopy, 74 (81.3%) testes were found within the abdominal cavity. In 7 (7.7%) patients, only nubbin of tissue was identified and removed. The first stage of Fowler Stephen procedure was done in the majority of the patients. There was statistically no significant difference following stratification in relation to laterality and position of undescended testis (p = 0.556 and p = 0.846, respectively). However, mean size of the testis was found statistically significant (p = 0.032). Most of the patients were above five years of age. Ultrasound helped in identifying low-lying intra-abdominal testis in more than 80% of patients. Laparoscopy was helpful in further defining the position of the testis and selection of surgical procedure. Undescended testis, Cryptorchidism, Laparoscopy, Orchiopexy.

Anatomic pattern and variations of the ilioinguinal nerve as it travels throughout the anterior abdominal wall: Cadaveric study

Introduction: Ilioinguinal nerve (IIN) is repeatedly damaged during surgeries as well as through the application of local anaesthesia to the lower abdominal wall. This study aimed to identify the variations of the IIN during its course in the anterior abdominal wall. Materials and Methods: A cross-sectional study on formalin-preserved cadavers was carried out after approval by the ethical committee, Alzaeim Alazhari University (January 2018–May 2020). Cadavers satisfied the inclusion criteria were dissected bilaterally to expose and map the IINs from their lateral emergence on the anterior abdominal wall to their termination in the midline in reference to the internal and external inguinal rings as well as the fixed bony landmarks. The collected data were compared on both sides using SPSS version 21.0. Results: Fifty-four IINs were identified (77 cadavers). Double nerve was observed in 8.44%. IINs derived from L1, L1-3 and L3 in 98.1%, 1.3% and 0.6%, respectively. On the right side, in 3 corpses, the nerves aberrantly ascend from L3 or L1-3, whereas this deviant was not seen on the left side. The mean distance from the umbilicus was 9.2 cm ± 1.1 cm (equal on both sides). The mean distance from the deep ring was 1.5 cm ± 0.4 cm, it was closed on the right compared to the left (P = 0.87). It emerges 0.9 cm–6 cm from the anterior superior iliac spine, this was closed on the right than the left (P = 0.9). It was not attached to the external oblique muscle on the right side, whereas it did in 3.2% on the left (P = 0.03). The mean distance from the superficial ring was 1.9 cm ± 0.8 cm, almost the same on both sides. The mean distance from the inguinal ligament was 2.4 cm ± 0.5 cm, it was closed on the right than on the left (P = 0.98). Its mean thickness was 1.97 mm ± 0.44 mm and 1.88 mm ± 0.43 mm on the right and left sides, respectively. Conclusion: IIN demarcates variants not generally quoted in anatomical manuals.

Corona mortis, aberrant obturator vessels, accessory obturator vessels: clinical applications in gynaecology

Corona mortis (CMOR) is a heterogeneous and often dubious term that causes much confusion in medical literature, especially in regard to its modern day significance in pelvic surgery. Some authors define CMOR as any abnormal anastomotic vessel between the external iliac and obturator vessels, whereas others define it as any vessel coursing over the superior pubic branch, regardless whether it is a vascular anastomosis, an accessory obturator vessels, an obturator vessel related to the external iliac system or a terminal small vessel. There is no standard classification of CMOR and obturator vessels variations, although there are multitudes of classifications describing the diverse variations in the obturator foramen region. We define accessory obturator, aberrant obturator vessels and CMOR as different structures, as CMOR is an anatomical term that reflects a clinical situation rather than an anatomical structure. A new clinical classification for aberrant, accessory obturator vessels and CMOR is proposed regarding the anatomical variations, and the location of vessels to the deep femoral ring. The clinical significance of accessory obturator, aberrant vessels and CMOR is delineated in oncogynaecological and urogynaecological surgery.

The Interaction Between Warm‐Core Rings and Submarine Canyons and Its Influence on the Onshore Transport of Offshore Waters

AbstractGulf Stream warm‐core rings (WCRs) impinging onto the Mid‐Atlantic Bight (MAB) shelf edge can induce substantial water exchange between the shelf and slope seas. Combining satellite imagery and idealized ocean models, this study investigates the long‐neglected influence of submarine canyons on the WCR impingement process. Satellite images show onshore intrusion of the WCR water concentrated near the MAB shelf‐break canyons, indicating canyon‐induced enhancement of cross‐shelf exchange. Model simulations of the ring‐canyon interaction qualitatively reproduce the observed pattern and show greatly enhanced vertical motions and cross‐shelf transport in a canyon. The ring‐induced transient flow in a canyon resolved by the model is consistent with the three‐dimensional canyon circulation driven by ambient along‐slope steady flows as depicted in the literature. Cross‐isobath flows occur over both canyon slopes with a strong upwelling onshore flow over the slope upstream to the coastal‐trapped wave propagation (the upwave slope) and a weak downwelling offshore flow over the downwave slope. To conserve potential vorticity, a subsurface‐intensified cyclonic eddy is formed inside the canyon, which interacts with the sloping bottom and enhances the upwelling onshore flow over the upwave slope. The upwelled deep ring water is transported either back offshore by the ring‐edge current on the upwave side of the canyon or across the canyon onto the downwave shelf forming a localized bulge pattern. While the former is an ephemeral onshore transport process, the latter represents a more sustained onshore transport of the ring water, both of which have major implication for ecosystem dynamics at the shelf edge.

Prospects for exploration of hydrogen fields in riftogene structures of platforms (the case of the Dnieper-Donets Aulacogene)

This paper shows the prospect to find industrial-scale hydrogen accumulations in riftogenic structures of platforms using the example of the Dnieper-Donets Aulacogene, located in the southern part of the East European Platform. Within the Dnieper-Donets Depression, geological and geophysical methods indicate a significant number of deep faults and ring structures of volcanogenic and explosive origin promising increased hydrogen content. Possible locations of the most propitious areas of hydrogen concentration are associated with faults in rift systems and their nearest margins, as well as with explosive and volcanogenic ring structures with signs of modern activation. At a fine-grained level, the prospectivity of the area is determined not only by the specified structural relationship, but also by the set of geophysical characteristics (thermal, seismic, gravity, electrical conductivity, magnetic) and the corresponding geological and hydrogeological parameters. Areas for further more detailed investigations within the Sribne and other ring structures, Southern Near-Edge Fault, Northern Near-Edge Fault were identified based on the data on geological and geophysical materials, satellite images, and field work. We defined high-priority and low-priority territories. Areas for initial investigations using satellite images, gas sampling (hydrogen, helium, methane, etc.), primary geophysical surveys (with evaluation of intermediate reservoirs and cap rocks) were identified. The primary results can be used to plan pilot shallow drilling and wells sampling. The areas for priority deeper drilling and sampling are selected by the sum of results obtained and data comparison. The paper presents the results obtained 30 km east of Kyiv as an example of field assessment of H2 degassing in a local depression. The results show that hydrogen concentrations at depths of 0.45 to 1.5 m are near zero outside the local depression. The maximum values of H2 concentration (up to 3300 ppm 1.5 m deep) are characteristic of the point inside the depression.