Thermal Evolution History of Shale in Da’anzhai Member and Its Petroleum Geological Significance in Central Sichuan Basin

doi:10.7657/XJPG20240302

Abstract

Abstract:

The Da’anzhai member of the Lower Jurassic Ziliujing formation is the most favorable layer for the development of continental shale oil in the Sichuan basin, and has huge potential in shale oil exploration. However, there is a lack of systematic research on the thermal evolution history of this formation. Using the simulation system for petroliferous basins, the differences in the thermal evolution and hydrocarbon generation of the shales in Da’anzhai member between the northern part and the central part of the central Sichuan basin were comparatively analyzed, and their impacts on shale oil enrichment were discussed. The thermal evolution degree of the shale of Da’anzhai member in the study area gradually increases from southwest to northeast, and the shale can be divided into a highly matured zone and a matured zone on the plane. The highly matured zone is located in the northern part of the study area, with vitrinite reflectance ranging from 1.3% to 1.7%, mainly developing Type Ⅲ organic matter. The early oil generation occured in the early Late Jurassic, and the oil generation peaked at the end of Late Jurassic, experiencing two phases of hydrocarbon generation. The matured zone is located in the central to southern parts of the study area, with vitrinite reflectance ranging from 0.9% to 1.3%, mainly developing Type Ⅱ₁-Ⅱ₂ organic matter. The sedimentary thickness of the Jurassic is relatively small, the early oil generation occured at the end of the Late Jurassic and reached the peak in the Early Cretaceous, with only one period of hydrocarbon generation. Compared with the northern area, a large set of organic-rich shales deposited in the central area, which provieded a solid material basis for shale oil in the Da’anzhai member. However, the tectonic uplift and stratum erosion since the Paleogene posed a certain destructive effect on the preservation of oil and gas in this area.

Key words: Sichuan basin, Lower Jurassic, Ziliujing formation, Da’anzhai member, thermal evolution history, hydrocarbon generation capacity, preservation, shale oil and gas

CLC Number:

TE122

JIANG Qijun, LI Yong, XIAO Zhenglu, LU Jungang, QIN Chunyu, ZHANG Shaomin. Thermal Evolution History of Shale in Da’anzhai Member and Its Petroleum Geological Significance in Central Sichuan Basin[J]. Xinjiang Petroleum Geology, 2024, 45(3): 262-270.

Figures/Tables 9

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Table 1.

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沉积结束时间/Ma	地层	LA1井			RA1井
沉积结束时间/Ma	地层	残余厚度/ m	剥蚀厚度/ m	古热流值/ （mW·m^-2）	残余厚度/ m	剥蚀厚度/ m	古热流值/ （mW·m^-2）
0	新近系—第四系	0	1 350	47	0	1 300	55
23	古近系	0	950		0	700
66	白垩系	2 300		48	2 000		53
147	蓬莱镇组	900	60		700	300
159	遂宁组	420			400
162	沙溪庙组上段	1 180		52	864		52
168	沙溪庙组下段	860			336
171	凉高山组	170			120
174	大安寨段	84		56	75		60