Development characteristics and forming mechanism of Middle Permian fault-karst carbonate reservoirs in the central Sichuan Basin

doi:10.3969/j.issn.1672-7703.2019.01.011

Abstract

Abstract: The Middle Permian carbonate rocks in the central Sichuan Basin have experienced multi-stage tectonic deformation and karstification, and accordingly various irregular fault-karst carbonate rocks have been formed along the dissolved fault zone. In order to clarify the forming and development characteristics, and predict where fault-karst carbonate rocks are developed, the type and forming mechanism of fault-karst carbonate rocks have been studied. According to core, thin section, logging and seismic data, three types of fault-karst carbonate rocks were identified, including vug-fracture type, fracture type and fracture-vug type, which depend on the development scales and periods of karst reservoirs and faults. The vug-fracture type is based on the karst vugs from the superposition of syn-depositional fault belts and the exposure of the Maokou Formation. The fracture type is the result of the joint dissolution action among meteoric water, thermal fluids and organic acid on the resurrecting deep and large faults formed in the Caledonian and Hercynian periods. The fracture-vug type is the fault controlling composite formed in the Caledonian and Hercynian Movements, which are formed by the secondary faults and plane fault-karst carbonate rocks as the result of meteoric water and organic acid dissolving the Middle Permian granular beach. As a type of composite reservoir, fault-karst carbonate rocks provide good spaces for oil and gas, and are mainly distributed in the dissolution planes of large and deep faults and its associated secondary fault belts. The fracture-vug type is the most favorable reservoir.

Key words: central Sichuan Basin, Middle Permian, structural deformation, karstification, fault-karst carbonate rock, reservoir

CLC Number:

Li Rong, Hu Mingyi, Pan Renfang, Hu Zhonggui. Development characteristics and forming mechanism of Middle Permian fault-karst carbonate reservoirs in the central Sichuan Basin[J]. China Petroleum Exploration, 2019, 24(1): 105-114.

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