| Citation: | Wang Chonghuan, Wei Qinlian, Hu Rong, Xiao Ling. Microstructure characteristics and genetic analysis of tight reservoirs with different provenance systems: A case study of Fanjiachuan and Nanliang region of Chang 6 reservoir in Longdong area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 286-298. doi: 10.19509/j.cnki.dzkq.2021.0258
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Ordos Basin is rich in tight oil and gas resources.The multi-source system controls the development of Chang 6 reservoir in Longdong area. However, the current study on the microstructural characteristics of sand bodies is weak, which has restricted the exploration and evaluation of Chang 6 reservoir in this area. In this study, we used microstructural analysis by thin sections, X-ray diffraction and constant-speed mercury intrusion analysis to identify the microstructure characteristics of reservoirs, and to compare the influence of sedimentary microstructures on reservoir development. Based on these information, we establish corresponding pore evolution models, and discuss the control mechanisms of main diagenesis on reservoir densification. Our results can concluded as followed.①Throats are the main factor to control the permeability of the reservoir. The northeast provenance area shows better throat development and higher permeability than the western provenance area; ②As the permeability increases, the contribution of large throats to the permeability increases significantly in Nanliang area; ③Sedimentary microfacies can be important factors to control the physical properties of sand bodies in different provenance systems. The physical properties of sandy clastic flow and turbidity current sand bodies are better in Nanliang area than those in Fanjiachuan area.Compaction can be the major reason for reservoir densification.Affected by the content difference of illite and chlorite in reservoirs of different provenance systems, the amount of compaction reduction in the northeast provenance deposition area (19.29%) is less than that in the western provenance deposition area (22.32%).The new results have guiding significance to evaluate the late evaluation of tight oil from different provenance systems.
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