Hydrocarbon Gas Generation Research Articles

Characterization of Pyrolysis Kinetics of Continental Shale: Comparison and Enlightenment of the Parallel Reaction Model and the Overall Reaction Model

A total of nine immature–low maturity oil shale samples from Fushun and Maoming, the main oil shale producing areas in China, and three mature shale samples from the Jiyang Depression, China, were selected for use in hydrocarbon generation thermal simulation experiments in an open system and a closed system. The parallel first–order reaction kinetic model and the overall nth–order reaction kinetic model were used to calibrate the pyrolysis kinetic parameters of the samples. This comparative study revealed following conclusion. The generation period of the gaseous hydrocarbons (C1–5) was the longest, and the generation period of the heavy hydrocarbon (C14+) was the shortest. The activation energy of the hydrocarbon generation reaction was closely related to the maturity of the organic matter, i.e., the higher the maturity of the sample, the higher the activation energy of the reaction, which indicates that oil shale/shale oil conversion requires higher temperature conditions. The parallel first–order reaction model regards the hydrocarbon generation reaction as a series of first–order reactions, and it has a better fitting effect for the longer hydrocarbon generation period reactions, such as generating gaseous hydrocarbons (C1–5) and light components (C6–14) from organic matter. The overall nth–order reaction treats the reaction as a nth–order reaction, and the nth–order reaction has a better fitting effect for reactions with a narrow hydrocarbon generation window, such as generating heavy components from organic matter. In the process of generating hydrocarbons from organic matter, the order of the reaction is the sum of the orders of the sub–reactions. The more hydrocarbon–generating parent material, the higher order of hydrocarbon–generating reaction. The reaction order sequence of the generation of different hydrocarbons from organic matter is as follows: generation of gaseous hydrocarbons > generation of light hydrocarbons > generation of heavy hydrocarbons.

The evolution of pore structure heterogeneity during thermal maturation in lacustrine shale pyrolysis

Although pore structure variations during thermal maturation have been extensively discussed using natural or artificially matured shale samples, related investigations into pore structure heterogeneity and its evolution remain scarce, posing challenges in fine reservoir evaluation and exploration target prioritization. The variation of pore structure heterogeneity during thermal maturation was determined in this study by integrating multifractal theory with nitrogen adsorption-desorption tests using the naturally immature sample and the artificially matured samples, and the governing factors were ascertained. The increasing thermal maturity results in organic matter transformation, hydrocarbon generation, retention and expulsion, and various types of pore formation, driving the variation of pore structure heterogeneity. Pore structure heterogeneity, quantified by the breadth of singular spectra, was chiefly impacted by the pore volume difference between diverse types of pores. Macropores make a main contribution to pore structure heterogeneity due to their higher percentage of total pore volume compared to mesopores and micropores. Through a comparison of pore structure heterogeneity in shale samples with different thermal maturity, the impact of thermal maturity on shales was clarified. At immature to low-mature stages, nonthermal maturity factors make a main contribution to the inherent pore structure of different shales and cause an ambiguous relationship between pore structure heterogeneity and thermal maturity. At mature to high-mature stages, pore structure becomes more heterogeneous with increasing thermal maturity, resulting from newly formed organic pores or dissolution pores and the progressive generation and expulsion of liquid and gaseous hydrocarbons. At the over-mature stage, pore structure heterogeneity decreases and then fluctuates on a small scale, related to the collapse of mesopores and macropores caused by compaction and the predominance of newly formed micropores.

Hydrocarbon Generation Potential of Microbial Carbonate in the Western Qaidam Basin, China: Implication From Thermocompression Experiment

The potential of microbial carbonate rocks as hydrocarbon source rocks still remains uncertain. To evaluate the hydrocarbon generation and expulsion capability of microbial carbonate rocks, stromatolite obtained from the Xiaganchaigou formation of the western Qaidam Basin has been used for thermocompression experiments to simulate hydrocarbon generation and expulsion at temperature of 280 to 380°C. The results show that the generation potentials of total oil, residual oil, expelled oil, and hydrocarbon gases for stromatolite are 143.39 to 379.99 mg/g total organic carbon (TOC), 47.08 to 223.92 mg/gTOC, 71.12 to 170.81 mg/gTOC, and 6.60 to 101.74 mg/gTOC, respectively. A three-stage model of hydrocarbon generation and expulsion evolution has been constructed for stromatolite. The results show that the first stage is characterized by relatively slow oil generation with associated hydrocarbon gases, having limited capability of oil expulsion in the temperature range of 280 to 360°C (0.50% ≤ Ro ≤ 0.70%). The second stage is characterized by rapid oil generation with associated hydrocarbon gases, having incremental capability of oil expulsion in the temperature range of 320 to 360°C (0.70% ≤ Ro ≤ 1.15%). The third stage is characterized by hydrocarbon gas generation with associated oil, having efficient oil expulsion capability in the temperature range of 360 to 380°C (1.15% ≤ Ro ≤ 1.45%). The experimental data of argillaceous dolostone, gray mudstone, and marlstone, which were reported with the same hydrocarbon generation experimental method, was compared with the data for stromatolite. Compared with traditional source rocks, the oil generation potential of stromatolite is less than that of argillaceous dolostone and gray mudstone but greater than that that of marlstone in the same amount of organic carbon. Especially, the hydrocarbon gas generation potential of stromatolite is approximately double than that of traditional source rocks. Therefore, the experiments indicate that the microbial carbonate rocks in the western Qaidam Basin could be effective source rocks.

Organic and Isotopic Geochemistry of Evaporites and Shales of the Santana Group (Araripe Basin, Brazil): Clues on the Evolution of Depositional Systems and Global Correlation during the Lower Cretaceous

Even being the more studied of the interior basins of Northeast Brazil, the Araripe Basin still lacks research in organic geochemistry designed to support interpretations of depositional systems and conditions of formation. This work aims to investigate the organic behavior of evaporites and shales from the Santana Group (Lower Cretaceous), as well as discuss their role in the evolution of its depositional systems. A total of 23 samples, 17 shales and six evaporites, were collected in outcrops and quarries. Analyses of Total Organic Carbon (TOC), Total Sulfur (TS), Rock Eval pyrolysis, and the δ34S isotope ratio were performed. The TOC results revealed high organic content for seven intervals, of which only five had high TS content. From the Rock Eval pyrolysis, dominance of the Type I kerogen was verified, thus corresponding to the best type of organic matter (mainly algal) for the generation of liquid and gaseous hydrocarbons. The Lower Cretaceous (probably Aptian) response to the progressive evolution in redox conditions is linked to a remarked Oceanic Anoxic Event (OAE-1a). The TOC/TS ratio suggests variable palaeosalinity, indicating most of the shales were formed under brackish waters with saline influence, yet tending to increase the salinity upwards where hypersaline conditions dominate in the Ipubi Formation. The isotope data also suggest the occurrence of marine ingressions in the depositional systems even prior to the well-documented event of the Romualdo Formation.

Influence of particle size and temperature on the yield and composition of products from the pyrolysis of Jimsar (China) oil shale

The influence of particle grain size and retorting temperature on the yield and composition characteristics of products evolved from the pyrolysis of oil shale for a range of sizes from granules to large blocks (6−20, 20−30, 30−50 and 50−55 mm) is investigated. The results show that oil shale particle size has no significant effect on the yield of shale oil and non-condensable gas, and the highest yield of shale oil is achieved at the retorting temperature of 520 °C. The generation of C1-C5 hydrocarbon gases has two main temperature ranges (350−500 °C and 500−600 °C) due to the temperature gradients in oil shale particles and packed beds, and the secondary reactions of carbonaceous residues and retained oil. The main constituents of shale oil are aliphatic hydrocarbons, aromatic hydrocarbons and heteroatom-containing compounds ranging from the number of carbon atoms C6-C26. And the chemical composition of non-condensable gases and shale oil has certain regularity changes with the changing of particle size and retorting temperature, which is attributed to the important effect of particle size and retorting temperature on the secondary reactions of pyrolysis products during diffusing out of oil shale particles and packed bed.

Elements of regional organic geochemistry and separate prediction of oil and gas content of regions

The article considers the elements of organic geochemistry in the regional aspect, which aims to separate quantitative prediction of oil and gas content of regions. The principles and results of balance calculations of generation and emission of liquid and gaseous hydrocarbons for different facies-genetic types of organic matter and methods for calculating the scale of hydrocarbon emission are considered. Finally, a list of the main regularities of organic geochemistry is given.

Elements of regional organic geochemistry and separate prediction of oil and gas content of regions

The article considers the elements of organic geochemistry in the regional aspect, which aims to separate quantitative prediction of oil and gas content of regions. The principles and results of balance calculations of generation and emission of liquid and gaseous hydrocarbons for different facies-genetic types of organic matter and methods for calculating the scale of hydrocarbon emission are considered. Finally, a list of the main regularities of organic geochemistry is given.

Thermal maturation, mineral catalysis, and gas generation kinetics of carbonate source rock

Source-rock evaluation must start by first characterizing thermal maturity. The concept of thermal maturation or thermal decomposition is a well-defined quantitative modelling of kinetic parameters to explain the generation and expulsion of liquid and gaseous hydrocarbons from sedimentary source rocks. However, unlike coal and shale source rocks, carbonate source rocks are emerging source rocks and no analyses of thermal maturation kinetics have been reported in the literature. Apparently, this study is one of the most recent and first laboratory study of thermal maturation kinetics of carbonate source rock. In this paper, we simulated this process by conducting controlled laboratory experiments under high temperature from 40 °C to 450 °C using advanced integrated analytical techniques. The dataset is modeled by the solid state kinetics of first order reactions. In addition, the poor knowledge of how catalytic minerals stimulate thermal maturation is investigated; a unique and significant contribution that sets this work apart from previous thermal maturation studies. The result from kinetic modelling showed that the distribution of activation energy in the range of 99–325 kJ/mol is bimodal, reflecting possible peak shift in the thermal decomposition process, reaction mechanism and maturation prediction. The model further suggests that the maturation process of carbonate-rich source rock is very likely to be different from that of clay-rich source rock. Elemental and mineralogical analyses of investigated sample revealed the presences of catalytic elements such as iron, gypsum, pyrite and kaolinite. The analysis of the generated gases constrained to only three gases showed that the volume content of carbon dioxide, methane and water are 2%, 46% and 52% respectively. The generation of carbon dioxide is constant whereas methane increases and water decreases respectively with thermal maturation. Although, the investigated sample has a high calcite content of 91.9%, the methane content of 46% gives a strong indication of high natural gas generative potential as contrasted with the 2% of carbon dioxide generated. The findings of this study can help to better understand the coupled mechanism controlling thermal maturation of carbonate source rock and also provide useful reference dataset for basin modelling of carbonate source rocks for field studies.

A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China

To compare the micropore structure of marine-continental transitional shale with marine shale, organic geochemical, field emission scanning electron microscopy, and low-temperature nitrogen adsorption experiments were conducted on shale samples from the Shanxi Formation in the eastern Ordos Basin and the Longmaxi Formation in the southern Sichuan Basin. The results show that Shanxi Formation shale has a smaller specific surface area and pore volume than Longmaxi Formation shale; therefore, the transitional shales fail to provide sufficient pore spaces for the effective storage and preservation of natural gas. Both the transitional and marine shales are in an overmature stage with high total organic carbon content, but they differ considerably in pore types and development degrees. Inorganic pores and fractures are dominantly developed in transitional shales, such as intragranular pores and clay mineral interlayer fractures, while organic nanopores are rarely developed. In contrast, organic pores are the dominant pore type in the marine shales and inorganic pores are rarely observed. The fractal analysis also shows that pore structure complexity and heterogeneity are quite different. These differences were related to different organic types, i.e., type I of marine shale and type III of transitional shale. Marine Longmaxi shale has experienced liquid hydrocarbon cracking, gas generation, and pore-forming processes, providing good conditions for natural gas to be preserved. However, during the evolution of transitional Shanxi shale, gas cannot be effectively preserved due to the lack of the above evolution processes, leading to the poor gas-bearing property. The detailed comparison of the micropore structure between the transitional and marine shales is of great importance for the future exploitation of marine-continental transitional shale gas in China.

Hydrogen isotopic responses to thermochemical oxidation of light hydrocarbon gases in deep clastic reservoirs of the Junggar Basin, China

The occurrence of high-valence Mn/Fe oxides in deeply buried oxidized reservoir rocks promotes thermochemical oxidation of hydrocarbons (TOH). This study aimed to better understand this process and its effects on hydrogen isotopes via sampling natural gases from the Lower Triassic red beds with depths of >3.5 km in the Junggar Basin, NW China. The gas compositions, hydrogen and carbon isotopes of C1–C4 alkanes, and carbon isotopes of carbon dioxide were analyzed. The gases are almost mature thermogenic gases generated by sapropelic kerogen from the deeper Lower Permian source rock. The hydrocarbon gases display a unique reversed trend of δ2HCH4 > δ2HC2H6 < δ2HC3H8 > δ2Hn-C4H10, whereas the carbon isotopic compositions (δ13C) of C1–C4 alkanes mostly follow the normal trend of δ13CCH4 < δ13CC2H6 < δ13CC3H8 < δ13CC4H10. The average δ13C values of C1–C4 increased by 10.0‰, 6.0‰, 4.4‰, and 5.1‰, respectively, compared with the initial gases from source rocks, and exhibit a gradually declining trend. In contrast, the δ2H values of C1–C4 increased more from those of normal thermogenic gas, and the size of the 2H-enrichment varies, eventually resulting in the unique reversals. The δ2H and δ13C increments of methane are much higher than those of C2–C4. The reversals cannot be explained by current models for hydrocarbon gas generation, such as mixing of gases from different sources and thermal maturities. Instead, the results are consistent with a model where TOH caused a systematic 13C- and 2H-enrichment of C1–C4 after hydrocarbons charged the reservoir beds enriched in high-valence Mn/Fe oxides. Increase of C1 content accompanied by decreasing of C2–C4, heavy isotopic enrichment of C1–C4, and differential hydrogen isotopic fractionation of C1 and C2–C4 relative to theoretical calculation, suggest C2–C4 were preferentially oxidized during TOH, and C1 had been consumed in reaction. As TOH proceeded the 13C- and 2H-enrichment of C1–C4 was mainly caused by the Rayleigh fractionation. Involvement of formation water in the reaction intermediates of TOH is likely another factor causing the abnormal 2H-enrichment of C1 and the reversals. This study demonstrates that in some circumstances the TOH reactions induced by high-valence metal oxides cause large differences in the hydrogen isotopic compositions of natural hydrocarbons, and the process can be identified via their molecular and hydrogen isotopic signatures.

Relationship between Hydrocarbon Gas Generation and Kerogen Structural Evolution Revealed by Closed System Pyrolysis and Quantitative Py-GC Analysis of a Type II Kerogen

Kerogen can release both liquid and gaseous hydrocarbons during thermal maturation. In this study, the maturation and hydrocarbon generation of a low-maturity type II kerogen were simulated via tem...

Investigation of mechanism of smear formation from diamond-like carbon films on heating

The formation of head smears during the heat-assisted magnetic recording is a significant problem that must be addressed to ensure the reliability of the head-disk interface. In this study, the formation of a head smear by diamond-like carbon (DLC) films on magnetic disks was analyzed through simulated heating experiments. DLC films with a thickness of 100 nm were prepared and heated on a hot plate in an environmental gas chamber. A smear was observed on a silicon wafer placed 3 mm above the DLC surface film after the heating of the film. The smear amount was quantified based on the intensity of the carbon peak of the smear, which was measured by X-ray photoelectron spectroscopy. In air, the carbon concentration decreased with the heating temperature, while in nitrogen, it increased. Further, the carbon concentration of the smear formed in air was lower than that in nitrogen. A comparison of the smears formed by DLC films with different hydrogen concentrations showed that a greater amount of the decomposition gases was generated from the DLC films with a higher hydrogen concentration and that this value increased at lower temperatures. This result suggests that DLC films with low hydrogen concentrations generate smaller amounts of the decomposition gases during heating than those with high hydrogen concentrations. In addition, the results of Raman spectroscopy suggested that the DLC films get degraded during heating, resulting in the generation of hydrocarbon gases because the films contain carbon and hydrogen. Moreover, since peaks related to fragments with atomic masses of 250–500 atomic mass units were observed in the time-of-flight secondary ion mass spectrometry spectra of the smears, it can be concluded that the smears consist of hydrocarbons with relatively higher molecular weights.

Pyrolysis of coal measure source rocks at highly to over mature stage and its geological implications

The influence of water on gas generation from humic type organic matter at highly to over mature stage was investigated with thermal simulation experiments at high temperature and pressure. The result of the experiments indicates that the effect of water on gas generation was controlled by the thermal maturity of organic matter. Water could enhance gas generation and increase hydrocarbon gas yields significantly at over mature stage of humic type organic matter. Hydrogen isotopic compositions of coal-derived gases generated at highly to over mature stage were mainly controlled by thermal maturity of source rocks, but also affected by formation water. Highly and over mature coal measure source rocks are widely distributed in China. The hydrocarbon gas generation capacity of coal measure source rocks and resource potential of coal-derived gases in deep formations would be significantly enhanced assuming that formation water could be involved in the thermal cracking of highly to over mature organic matter in real geological settings.

Insights of the pore system of lacustrine shales from immature to late mature with the aid of petrology, mineralogy and porosimetry: A case study of the Triassic Yanchang Formation of the Ordos Basin, North China

The study of pore network evolution is an important aspect of tight shale reservoir characterization. Pore spaces in shales consist of three major types: interparticle pores and intraparticle pores associated with mineral matrix and organic-matter pores. In this study, the evolution of pore networks for each pore type in lacustrine shales during thermal maturation was studied based on a suite of 19 Triassic Yanchang Formation shale samples from the Ordos Basin across a maturation gradient from immature to late mature (vitrinite reflectance (Ro) from 0.36 to 1.30%). The results show that different pore types follow systematic evolutions during thermal maturation and that the evolution of pore type and pore size is critically controlled by multiple diagenetic processes such as mechanical compaction, cementation, mineral dissolution, clay mineral transformation, and organic matter thermal maturation. Specifically, at immature and early mature stages (Ro < 0.55%), pores associated with mineral matrix are abundant and have moderate pore sizes. Interparticle pores exhibit preferential orientation along clay platelets. At the mature stage (0.55% < Ro < 1.15%), pores associated with mineral matrix have the smallest size, and interparticle pores become less common and show reduced preferential orientation because of mechanical compaction and cementation. Organic-matter pores start to develop at a maturity level of Ro 0.77% and higher. The total porosity and BET specific surface area show minimum values at Ro 1.12%, mainly because pre-existing matrix-related pores are destroyed by mechanical compaction and filled by migrated bitumen and liquid hydrocarbons, and then they increase when Ro exceeds 1.12%, which likely results from the development of secondary organic-matter nanopores due to the generation and expulsion of gaseous hydrocarbons. An increase in pore size of matrix-related pores at the late mature stage (1.15% < Ro < 1.30%) could be a result of dissolution by organic acid generated during organic matter thermal maturation.

Hydrogen production from steam gasification of corn straw catalyzed by blast furnace gas ash

A lab scale gasifier was built to perform the gasification experiment. The effects of temperature and steam flow on the process were investigated, and the effects of the addition of blast furnace gas ash (BFGA) on product composition, the value of H2/(CO + CO2), the lower heating value (LHV) of product gas, and productivity are summarized. The experimental results clearly indicate that the addition of BFGA in the steam gasification of corn straw pellets effectively enhances the ability of the downdraft gasifier to produce hydrogen-rich gas. Compared with the non-catalytic gasification process, the addition of BFGA promotes the formation of H2, inhibits the generation of methane, CH4, and other hydrocarbon gases, CnHm, and increases the H2/(CO + CO2) ratio. Unlike the process without the BFGA, the LHV of the product gas with BFGA increases with increasing temperature. When the water vapor volume was 0.75 kg/h, the gas production rate was the same at 850 °C with BFGA and at 950 °C without ash gas. The addition of BFGA clearly leads to a significant improvement in the ability of gasifiers to produce hydrogen-rich gas.

Development of Control Terminal of Control System of Light Hydrocarbon Gas Generator Based on NB-IoT

To improve the instability of light hydrocarbon gas supply station, the need for long-term maintenance and guard of staff, and improve the intelligence and automation of gas supply station, a perception terminal of light hydrocarbon gas generation device control system based on NB-IoT is designed. The data of liquid level, temperature, gas supply, and pressure are collected by STC15W4K56S4 low-power single-chip microcomputer. Based on the platform of the Internet of things, the remote transmission of data is completed by the BC95 module and local monitoring center. The experiment shows that the terminal can effectively transmit the collected data, respond to the command of the monitoring center, and complete the two-way communication between the terminal and the monitoring center, which has a high engineering value.

Studi Komponen Gas Hidrokarbon Batubara Menggunakan Metode Pirolisis Gas Kromatografi

This recent research was conducted to investigate the characteristics of lignite from organic geochemistry side using pyrolysis method of gas chromatography. Thi aim of the study is to analyze three important things concluding the generated hydrocarbon gases, calculate the gas volume, and investigate its environmental setting. The gas product is called pyrolisat which generated during processing of pyrolysis that shown as chromatogram graph on computer screen concluding group of short carbon- chain (C1-4), medium carbon-chain (C5-14), and long carbon-chain (C15). The research result revealed that short carbon-chain has dominant percentage (81,9%) than medium carbon chain (9,5%) or long carbon chain (8,6%). This condition indicates that coal sample consisted of various organic matter particularly methane which derived from land plants. Based on these research results, it can be conclude that organic matters were originally from terrestrial environmental setting.

Superimposed secondary alteration of oil reservoirs. Part I: Influence of biodegradation on the gas generation behavior of crude oils

Due to multi-stage tectonic movements, many oil reservoirs in typical superimposed basins of China have undergone more than one secondary alteration. Typically, these oil reservoirs experienced biodegradation at an early stage followed by thermal alteration at a later stage. The extent of each secondary alteration can be variable. Here, the succession of biodegradation and subsequent thermal alteration is called superimposed secondary alteration. This study aims not only to show the superimposed secondary alteration process in the reservoir by laboratory simulations, but also to show how varying extents of biodegradation influence the gas generation behavior of crude oils under thermal stress. Hydrocarbon gas generation potential is significantly reduced at the low to moderate biodegradation stage because of the selective removal of normal and branched alkanes. Hydrocarbon gases generated from the more severely biodegraded oils are drier, attributable to the decreasing yields of C2–C5 gases relative to methane. In the oil-generative window, the methane generated from more severely biodegraded oils is relatively enriched in 13C. Kinetic modeling suggests that moderately and severely biodegraded oils are thermally less stable than the non-biodegraded and slightly biodegraded oils. The bulk hydrocarbon gas yields from the non-biodegraded oil do not exceed those from the moderately biodegraded oils until EasyRo > 1.6%. For EasyRo of 1.6–2.5%, pyro-bitumen yields from heavily to severely biodegraded oils were about 2–4 times that of non-biodegraded oil. That is, the gas yields normalized to the weight of pyro-bitumen from heavily to severely biodegraded oil is only 25–50% of the gas yield of non-biodegraded oil. Therefore, hydrocarbon gas resource potential based on pyro-bitumen content must be very carefully considered in cases of superimposed secondary alteration.

The architecture of organic matter and its pores in highly mature gas shales of the lower Silurian Longmaxi Formation in the upper Yangtze platform, south China

The nanometer-scale architecture of organic matter (OM) and associated pores in highly mature gas shales from the lower Silurian Longmaxi Formation in the upper Yangtze platform of south China were investigated using field emission scanning electron microscopy (SEM), focused ion beam SEM, and low-pressure gas (N2 and CO2) adsorption bulk pore characterization. The Longmaxi shale comprises fine-grained siliciclastic rocks deposited in a marine shelf environment, which was dominated by quartz and clay minerals. Four porous OM types were found in the Longmaxi shale on the basis of the chemical composition and spatial occurrence of OM, including (1) isolated original OM particles, (2) OM–clay mineral complexes, (3) OM–heavy mineral complexes, and (4) secondary migrated bituminous OM. The pores in the particulate OM are not homogeneously distributed, and the processes leading to different pores depend on the specific OM type. The nature of OM-hosted pores is a result of several factors, such as primary porous kerogen, mechanical compaction, organic–inorganic interactions, gaseous and liquid hydrocarbon generation, retention, and expulsion. Pore volumes and specific surface areas of the Longmaxi shale derived from low-pressure N2 and CO2 adsorption experiments reveal positive linear relationships with total organic carbon contents, which indicates that the pore systems in the highly mature Longmaxi shale are dominated by OM-hosted pores. Additionally, the OM-hosted pores appear connected compared to pores in the mineral matrix. Therefore, the OM-hosted pore systems offer the preferential storage space and primary migration pathways for natural gas in the Longmaxi shale reservoir.

Application of fine analysis technology for gas-source on condensate gas reservoirs in the Dinan Uplift

Some researches on the distribution of Carboniferous source rock in the Dinan uplift, Junggar Basin, has been clear that the Songkaersu Formation (C1sb) is relatively implement, but that of the Dishuiquan Formation (C1d) is still uncertain. The acknowledgment and conclusion of the hydrocarbon generation and gas generation capacity of C1d source rocks are fairly limited, and thus the contribution of this set of source rock to the natural gas in the southern Dinan uplift exists a certain dispute. In this paper, based on the predecessors’ research work, the fine-scale comparison of fingerprint characteristics between the two sets of source rocks in Carboniferous by using monomer hydrocarbon carbon isotope technique, and at the same time, the condensate oils which were associated with Carboniferous natural gas in this region were also compared in detail. As such, the contribution of Carboniferous C1sb and C1d source rocks was determined.