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Theory and practice of unconventional gas exploration in carrier beds: Insight from the breakthrough of new type of shale gas and tight gas in Sichuan Basin, SW China

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Petroleum Exploration and Development 2023年第1期50卷 27-42页

作者： GUO Tonglou XIONG Liang YE Sujuan DONG Xiaoxia WEI Limin YANG Yingtao Sinopec Southwest Oil&Gas Company Chengdu 610041China

Unconventional gas in the Sichuan Basin mainly includes shale gas and tight gas.The development of shale gas is mainly concentrated in the Ordovician Wufeng formation-Silurian Longmaxi formation,but has not made any significant breakthrough in the Cambrian Qiongzhusi Formation marine shale regardless of exploration efforts for years.The commercial development of tight sandstone gas is mainly concentrated in the Jurassic Shaximiao formation,but has not been realized in the widespread and thick Triassic Xujiahe formation.Depending on the geological characteristics of the qiongzhusi formation and Xujiahe formation,the feedback of old wells was analyzed.Then,combining with the accumulation mechanisms of con-ventional gas and shale gas,as well as the oil/gas shows during drilling,changes in production and pressure during develop-ment,and other characteristics,it was proposed to change the exploration and development strategy from source and reservoir exploration to carrier beds exploration.With the combination of effective source rock,effective carrier beds and effective sand-stone or shale as the exploration target,a model of unconventional gas accumulation and enrichment in carrier beds was built.Under the guidance of this study,two significant results have been achieved in practice.First,great breakthrough was made in exploration of the silty shale with low organic matter abundance in the qiongzhusi formation,which breaks the traditional approach to prospect shale gas only in organic-rich black shales and realizes a breakthrough in new areas,new layers and new types of shale gas and a transformation of exploration and development of shale gas from single-layer system,Longmaxi For-mation,to multi-layer system in the Sichuan Basin.Second,exploration breakthrough and high-efficient development were re-alized for difficult-to-produce tight sandstone gas reserves in the Xujiahe formation,which helps address the challenges of low production and unstable production of fracture zones in the Xujiahe formation,promote the tr

关键词： Sichuan Basin carrier bed tight gas shale gas silty shale Cambrian Qiongzhusi Formation Triassic Xujiahe formation

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Geological characteristics of the southern segment of the Late Sinian–Early cambrian Deyang-Anyue rift trough in Sichuan Basin, SW China

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Petroleum Exploration and Development 2023年第2期50卷 321-333页

作者： LI Rong WANG Yongxiao WANG Zecheng XIE Wuren LI Wenzheng GU Mingfeng LIANG Zirui PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina Hangzhou Geological Research Institute Hangzhou 310023China Sinopec Exploration Company Chengdu 610000China

Based on the latest drilling, seismic and field outcrop data, the geological characteristics(e.g. strata, development and sedimentary evolution) of the southern segment of the Late Sinian–Early cambrian Deyang–Anyue rift trough in the Sichuan Basin are analyzed. First, the strata in the southern segment are complete. The first to second members of Dengying formation(Deng 1 + Deng 2) are found with relatively stable thickness(400–550 m), and the third to fourth members(Deng 3+ Deng 4) show great thickness difference between the marginal trough and the inner trough, which is up to 250 m. The cambrian Maidiping formation and qiongzhusi formation in southern Sichuan Basin are relatively thin, with the thickness changing greatly and frequently. Second, the Deyang–Anyue rift trough extended southward during the Deng 4 period, affecting southern Sichuan Basin. Compared to the middle and northern segments of the rift trough, the southern segment is generally wide, gentle and shallow, with multiple steps, and alternating uplifts and sags, which are distributed in finger shape. Third, the Deng 1 + Deng 2 in southern Sichuan Basin records the dominance of carbonate platform and unobvious sedimentary differentiation, and the Deng 4 exhibits obvious sedimentary differentiation, namely, basin–slope–secondary slope–slope–secondary slope–platform margin–restricted platform, from the inner trough to the marginal trough. Fourth, the rift trough in southern Sichuan Basin has evolved in four stages: stabilization of Deng 1–Deng 2, initialization of Deng 3–Deng 4, filling of Maidiping–qiongzhusi, and extinction of Canglangpu formation.

关键词： Deyang-Anyue rift trough geological characteristics secondary slope development and evolution cambrian Maidiping formation Cambrian Qiongzhusi Formation Sinian Dengying formation Sichuan Basin

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