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Hydrocarbon accumulation and key exploration & development technologies of changning-weiyuan marine shale gas field, southern Sichuan

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Petroleum Research 2021年第1期6卷 1-15页

作者： Xiao He Jianfa Wu Rui Yong Shengxian Zhao PetroChina Southwest Oil&Gas Field Company Chengdu610051China

China is rich in shale gas resources and has broad prospects for development. However, the quality ofshale gas resources in China is different from that in the United States, so independent unique technologies are urgently required in China. In this regard, PetroChina has carried out theoretical andtechnical researches systematically on shale gas in Longmaxi Formation in southern Sichuan according toits geology-engineering characteristics. Guided by the “three-control” theory for marine shale gasenrichment and high yield (i.e. sedimentary diagenesis controls reservoir, preservation conditions control accumulation, and continuous thickness of Type I reservoir controls production), six key explorationand development technologies in southern China have been innovatively developed for marine shale gaswhich experienced multi-stage tectonic evolution. The technologies include comprehensive geologicalevaluation technology, development optimization technology, optimal and fast drilling technology forhorizontal well, volume fracturing technology for horizontal well, factory-like operation technology, andefficient clean production technology. These technologies have enabled the large-scale commercial recovery of shale gas. By the end of 2019, PetroChina had obtained proved geological reserves of1.06 1012 m3, had built production capacity of 10 109 m3, and had cumulative gas production of20 109 m3 in southern Sichuan. The remarkable results of application are of great significance forvigorously developing shale gas industry to reduce external dependence, ensure national energy security,and realize the strategy of "ecological priority and green development".

关键词： Shale gas Exploration and development Hydrocarbon accumulation condition Horizontal well Optimization Fracturing Changning-weiyuan area Southern sichuan

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