Reservoir Characteristics and Comprehensive Evaluation of the Middle Jurassic Shaximiao Formation in Middle of Western Sichuan Depression

doi:10.11885/j.issn.16745086.2019.08.28.03

Abstract

Abstract: The Shaximiao Formation of Middle Jurassic in the West Sichuan Depression is a delta-shore-shallow lake sedimentary system developed under the background of multiple provenance. Different provenance background has great influence on reservoir and the exploration effect is obviously different the reservoir characteristics of the near-source and distal-source depositional systems have been analyzed and compared on the basis of core and drilling cutting analysis, thin section observation and reservoir test analysis. The results imply that the near-source reservoir is dominated by low-maturity, coarse grained sandstone. Its favorable reservoirs consist of fine-grained sandstone characterized by matured lithology, low calcite cement, and well-developed fractures. The preservation of porosity is the major controlling factor of reservoir quality. On the contrary, the favorable reservoirs of distal-source depositional system are composed of low-maturity, medium-grained sandstone with low calcite cement and high feldspar contents. Pressure dissolution has significantly contributed to the development of secondary porosity, which further improve the quality of reservoirs. On such basis, classification standards are established to evaluate the reservoirs quality of the two depositional systems. The results show that the reservoir development of distal-source depositional system is significantly better than the near-source system, since its favorable reservoir has greater lateral extent.

Key words: middle section of Western Sichuan Depression, Shaximiao Formation, sedimentary system, comparative study, reservoir evaluation

CLC Number:

TE122

ZHANG Ling, CHEN Gongyang, YE Sujuan, YANG Yingtao, CHENG Leli. Reservoir Characteristics and Comprehensive Evaluation of the Middle Jurassic Shaximiao Formation in Middle of Western Sichuan Depression[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 12-24.

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