Geological characteristics of continental shale gas reservoir in the Jurassic Da’anzhai member in the northeastern Sichuan Basin

doi:10.3969/j.issn.1672-7703.2020.05.005

Abstract

Abstract: In this paper, continental shale gas reservoirs in the Da’anzhai member of the Jurassic Ziliujing Formation in the Yuanba and Fuling areas in the northeastern Sichuan Basin is studied to investigate the geological characteristics and exploration and development potential. Core analysis and lab test were conducted, including core observation, thin section identification, X-ray diffraction, organic carbon content analysis, Scanning Electron Microscope, high-pressure mercury injection and nitrogen adsorption, to determine the sedimentary environment and lithology, organic geochemical characteristics, reservoir space and gas-bearing properties, mineral composition and fluid properties of continental shale gas reservoir. The results show that organic- rich shales are developed in shallow to semi-deep lacustrine facies in the Da’anzhai member. The lithology is mainly shale intercalated with stripped or laminated sandstones and shell limestones. The organic matter type is Type Ⅱ2 or type Ⅲ. TOC is 0.33%?3.78%. Ro is 1.11%?1.82%, indicating a mature to high mature stage. The reservoir space in the shale is mainly mineral pores. The porosity ranges from 1.5% to 6.7%, with micro-pores less than 2nm and medium pores of 2?50 nm being the most prevalent. The gas-bearing properties are good (average gas content is 1.49 m3/t). The shale has good fracability and the average content of brittle minerals is 51%. A total of 12 wells have obtained high-production oil and gas flows, showing good exploration and development potential. Comparative study of the differences between the characteristics of continental shale and marine shale indicates that favorable sedimentary facies is an important basis in enrichment and high production of continental shale gas in the Da’anzhai member. Shale gas accumulation is also controlled by rock association and lithologic composition, organic carbon content, physical properties, fluid pressure, and the development degree of micro fractures. These understandings provide reference for selection of the most favorable exploration and development target formations of Jurassic continental shale gas in the Sichuan Basin.

CLC Number:

Zhou Dehua, Sun Chuanxiang, Liu Zhongbao, Nie Haikuan. Geological characteristics of continental shale gas reservoir in the Jurassic Da’anzhai member in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2020, 25(5): 32-42.

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