Trap Types and Their Characteristics of Lithologic Oil-gas Reservoirs in Xiangxi Group in Upper Triassic, Central Sichuan
Basin

Abstract

Abstract: There are several gentle structure traps and small faults developed in central Sichuan Basin, some discovered oil-gas reservoirs are not related to anticlines. It is thought through related research that the lithologic trapsmainly developed in Xiangxi Group. According to the factors that controlled the formation of traps , paleo-geomorphology feature before Xiangxi Group deposition and fracture feature, lithologic trap types can be divided to four types, including: (1) stratigraphic-lithologic trap is related with stratigraphic pinch out;(2) diagenesis-lithologic trap is related with the facies variation of deposition and diagenersis;(3) differential compaction-lithologic trap is related with paleo-geomorphology;(4) fracture-lithologic trap is related with the transformation and adjustment of faults. Among theses, diagenesis-lithologic trap and stratigraphic-lithologic trap are regarded as the most important and extensive type distributed in central Sichuan Basin.

Key words: trap type, lithologic oil-gas reservoirs, Upper Triassic, Sichuan Basin

CLC Number:

P618.130

YangXiaoping, Zou Caineng and LiWei. Trap Types and Their Characteristics of Lithologic Oil-gas Reservoirs in Xiangxi Group in Upper Triassic, Central Sichuan Basin[J]. China Petroleum Exploration, 2006, 11(4): 33-36,4.

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Trap Types and Their Characteristics of Lithologic Oil-gas Reservoirs in Xiangxi Group in Upper Triassic, Central Sichuan Basin

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