The pre-Sinian rift in central Sichuan Basin and its control on hydrocarbon accumulation in the overlying strata
WEI Guoqi1, YANG Wei1, ZHANG Jian2, XIE Wuren1, ZENG Fuying1, SU Nan1, JIN Hui1
1. Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China; 2. PetroChina Southwest Oil & Gas Field Company, Chendu 610041, China;
Abstract:Based on the latest seismic data, resistivity profile, outcrop evidence and logging data, the structural features of basement in Sichuan Basin and its control on the hydrocarbon accumulation in the Sinian-Cambrian strata was discussed. It was found that a NE striking pre-Sinian rift was developed across the whole basin. Controlled by a series of rift-parallel normal faults, horst-graben structures were developed inside the rift, large horst-graben structures and later activity of their boundary faults controlled the distribution of beach facies of the overlying strata. The horst-graben structures induced the formation of local highs of ancient landform and controlled the successive development of overlapped bioherm beach facies in long-term marine setting from the Sinian period to the Permian period, and as a result a widely distributed favorable sedimentary facies belt was developed. The pre-Sinian rift and later activities of related normal faults controlled the development of the grain beach and karst reservoirs and the deposition of high quality source rock, which form structural-lithologic traps. Through comprehensive evaluation, two large structural-lithologic composite trap favorable exploration areas in the south and north of the Gaoshiti-Moxi area, were selected.
魏国齐, 杨威, 张健, 谢武仁, 曾富英, 苏楠, 金惠. 四川盆地中部前震旦系裂谷及对上覆地层成藏的控制[J]. 石油勘探与开发, 2018, 45(2): 179-189.
WEI Guoqi, YANG Wei, ZHANG Jian, XIE Wuren, ZENG Fuying, SU Nan, JIN Hui. The pre-Sinian rift in central Sichuan Basin and its control on hydrocarbon accumulation in the overlying strata[J]. Petroleum Exploration and Development, 2018, 45(2): 179-189.
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