Abstract
Reservoirs in the Songliao Basin are characterized by strong heterogeneity, which increases the difficulty of exact reservoir prediction. The clay interlayer developed in the reservoir is an important factor affecting the heterogeneity of the reservoir. Using the reservoir numerical simulation technology, an attempt has been made to investigate the storage efficiency during CO2 sequestration in Songliao Basin considering different types of interlayer in underground formations. Results indicate that type I interlayer, with a large thickness embedded between the two sand bodies has function of shunting and blocking to alleviate the impacts on cap rock. The type II interlayer has a small thickness and locates inside a single sand body, with poor physical properties and continuity, which has the same blocking effect on CO2 distribution and moderating influence on the cap rock. The physical properties of type III interlayer are same as the type II interlayer, but it has uneven distribution and poor continuity. In addition, three schemes of perforated zone were designed and their effects on CO2 storage efficiency and stability were studied. For a single reservoir, the scheme I is to perforate a whole reservoir, which is more conducive to maintain the reservoir’s stability. For multiple sets of “single-reservoir”, the scheme II can be preferentially selected to perforate the reservoir section below the interlayer when the injection volume is small. However, the scheme III can be used to perforate the interlayer and the reservoir below that when the injection volume is large. The study is beneficial to provide guidance and advice for selecting a suitable CO2 geological storage and reduce the risk of CO2 leakage.
Highlights
Songliao Basin is a large Meso-Cenozoic sedimentary basin in eastern China and a composite basin with dual faultdepression structure (Fig. 1)
The numerical simulation method was used to explore the influence of interlayer on CO2 storage efficiency, for further analysis and evaluation of the space utilization and stability of CO2 storage
By referring to the above ideas and combining the objectives of GCS project, it is critical to investigate the effect of the interlayer on CO2 storage
Summary
Songliao Basin is a large Meso-Cenozoic sedimentary basin in eastern China and a composite basin with dual faultdepression structure (Fig. 1). In the process of sedimentation and diagenesis of the reservoir, the interlayer with different genesis and distributions are formed. In the later stage of the reservoir prediction, if the interlayer is not considered, the flooding process of reservoir will be abnormal, and the prediction can be not accurate (Shan et al, 2007; Zhang et al, 2009). The above series of studies will eventually serve the development of oil and gas reservoirs, for investigating the effects of interlayer on waterflooding, drilling and reservoir distribution. For oilfield development, the interlayer has a blocking effect and affects the reservoir connectivity and oil production (Fan et al, 2015; Sun, 2013). The numerical simulation method was used to explore the influence of interlayer on CO2 storage efficiency, for further analysis and evaluation of the space utilization and stability of CO2 storage
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