Reservoir-Forming Conditions and Exploration Practices of Wutonggou Formation in Western Dinan Swell, Junggar Basin

doi:10.7657/XJPG20200502

Abstract

Abstract:

Superior conditions in the Dinan swell help develop three sets of hydrocarbon source rocks including Paleozoic Carboniferous Dishuiquan formation, Songkaersu formation and Permian Pingdiquan formation, which have good hydrocarbon supply capacity. Comprehensive analysis of accumulation conditions, seismic reservoir prediction and regional geology shows that large near-source oil and gas reservoirs could be developed in the Permian Wutonggou formation. This is the first set of sedimentary reservoir-cap assemblage above the unconformity in the Carboniferous top, whose transport system is composed of late Hercynian faults and the unconformity in the Carboniferous top, and the regional caprock composed of the upper 100-meter-thick mudstone is developed in the high-stand system tract. In the western section of the swell, transgressive sand bodies are constructive delta deposits, with the characteristics of superimposed and continuous accumulation. In the swell slope and sag areas, large and thick sand bodies of low-stand system tract are developed, but with poor physical properties. Sedimentary bodies with good physical properties such as slope deposits or alluvial fans and mid-fans can form massive oil and gas reservoirs with low porosity, low permeability and low abundance. The potential around the gas reservoirs that have been discovered in the Wutonggou formation is still large, and new gas reservoirs may be discovered in the slope and sag areas.

Key words: Junggar basin, Dinan swell, Wutonggou formation, accumulation condition, reservoir-cap assemblage, proven reserves

CLC Number:

TE112.6

WANG Gang, SHI Xinpu, LIU Xuemei, LIU Yunhong, ZHU Zhonghua, HOU Lei. Reservoir-Forming Conditions and Exploration Practices of Wutonggou Formation in Western Dinan Swell, Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(5): 519-526.

Figures/Tables 10

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