Hydrocarbon Generation Potential and Pore Characteristics of Chang 7 Oil Shale in the Zhangjiawan Region

doi:10.11885/j.issn.1674-5086.2018.03.12.01

Abstract

Abstract: Hydrocarbon generation potential and pore characteristics of Chang 7 oil shale from the Yanchang Formation in the Zhangjiawan Region of the Zhiluo Oilfield were examined in this study. We conducted petrological and organic geochemical analyses, and methods like scanning electron microscopy and argon ion milling were used to analyze the distribution, geochemical characteristics, and pore characteristics of the Chang 7 shale in the study area. The results reveal that the Chang 7 black lake shale from the Yanchang Formation in the study area is heterogeneous both horizontally and vertically. It is thick in the northwest, but thin in the southeast. The organic matter in the Chang 7 oil shale are primarily type I and Ⅱ₁ and are highly mature. Therefore, the shale is a desirable hydrocarbon source rock. The shale reservoir is a type 1 enrichment reservoir. The pores of the reservoir are mainly intergranular pores, intercrystalline pores, dissolution pores, and organic pores, where the pore sizes are mostly <0.5 μm. The throat radius ranges from 100 to 750 nm. There is a relatively porosity range (0.5% to 1.9%) with an average of approximately 1.0%. It is believed that the "newly discovered" Chang 7 shale in the study area has relatively great hydrocarbon generation potential, with a relatively high content of movable oil.

Key words: shale, potential of hydrocarbon generation, pore characteristics, Chang 7, Zhiluo Oilfield

CLC Number:

TE122

TANG Jianyun, ZHANG Gang, FAN Hongwei, LIU Jiantong, CHEN Yubao. Hydrocarbon Generation Potential and Pore Characteristics of Chang 7 Oil Shale in the Zhangjiawan Region[J]. 西南石油大学学报(自然科学版), 2019, 41(3): 29-41.

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