Influence of diagenesis on reservoir performance of shale: a case study of the upper sub-member of Member 4 of Paleogene Shahejie Formation in Dongying sag
YU Zhiyun1, CHEN Shiyue1, ZHANG Shun2, LIU Xinjin2, TANG Dong2, YAN Jihua1
1 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China; 2 Reserch Institute of Petroleum Exploration and Development,Shengli Oilfield,SINOPEC,Shandong Dongying 257022,China
Abstract：The pore structure characteristics and reservoir capacity of continental shale oil reservoirs are affected by the complex diagenetic alteration during burial,resulting in significant vertical differences. However,relevant researches are still limited. This work focuses on the typical continental organic-rich shale of the upper sub-member of Member 4 of Paleogene Shahejie Formation(Es4U)in Dongying sag,using the multi-scale observation methods like core description,thin section and scanning electron microscopy(SEM)observations,X-ray diffraction,isotope geochemistry,physical property and energy spectrum analysis,to reveal the diagenesis characteristics and its controls on reservoir quality of the shale. Our work has identified that: (1)Seven types of diageneses that can affect reservoir quality. The constructive diagenesis is mainly calcite recrystallization,clay mineral transformation,and dolomitization. The Es4U is overall in the middle diagenetic stage A. (2)Calcite recrystallization,clay minerals transformation,and dolomitization vary significantly in vertical. The sparry calcite caused by recrystallization is mainly developed in the $Ea^{4Ucs3}$ and the $Ea^{4Ucs2}$ layers. The intermediate and high pores formed by clay minerals transformation are mainly developed in the $Ea^{4Ucs2}$ layer. Based on the petrological characteristics,there are two types of dolomite identified in the study area. Among them,the argillaceous dolomite is mainly developed in the $Ea^{4Ucs3}$ layer,and the microcrystalline iron dolomite is mainly developed in the $Ea^{4Ucs1}$ layer and the $Ea^{4Ucs2}$ layer. (3)The combined actions of calcite recrystallization and clay mineral transformation generate a large number of micropores in the $Ea^{4Ucs2}$ layer. At the same time,moderate iron dolomite is a skeleton mineral to support the pores,conducive to preserving pores in a moderate-deep burial depth. It is the key for the $Ea^{4Ucs2}$ layer to become a high-quality shale-oil reservoir.
YU Zhiyun,CHEN Shiyue,ZHANG Shun et al. Influence of diagenesis on reservoir performance of shale: a case study of the upper sub-member of Member 4 of Paleogene Shahejie Formation in Dongying sag[J]. JOPC, 2022, 24(4): 771-784.
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