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In deep and ultradeep marine carbonate fields, a number of large oil and gas fields with different types of reservoirs and different accumulation processes have been discovered in China. In this study, the basic conditions, accumulation processes and key reservoir-controlled elements of the Tahe Oil Field, Shunbei Oil and Gas Field, Puguang Gas Field and Yuanba Gas Field, which were discovered in the Tarim Basin and Sichuan Basin, were compared and analyzed. The Tahe Oil Field and Shunbei Oil Field have formed typical paleokarst fracture–cavity reservoirs and fault-controlled fracture–cavity reservoirs under the influence of paleo-uplifts development and strike-slip fault activity. After multistage accumulations and multiple transformations, the planar distribution of oil and gas accumulation in different phases is still regular with some order. Under the influence of the development of Kaijiang–Liangping continental shelf, the Puguang Gas Field and Yuanba Gas Field have formed typical platform-margin reef–shoal–type reservoirs with favorable near-source enrichment accumulation conditions, which have also experienced whole processes of oil and gas phase transformation. Large-scale source–reservoir efficient source and reservoir configurations of the source and reservoirs, and good preservation conditions are important conditions for the formation of deep and ultradeep large oil and gas fields. In the three superimposed basins of Tarim, Sichuan and Ordos, paleokarst reservoirs related to large-scale unconformities, fault-controlled reservoirs related to Multistage faults, platform edge mound-shoal reservoirs related to sedimentary differentiation, and widely distributed paleomicrobial rocks and dolomite reservoirs that developed in confined tidal flat environments, are all important exploration targets.

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Typical Examples and Exploration Potentials of Large-Scale Petroleum Accumulations in Deep and Ultradeep Carbonate Reservoirs in China

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  • 出版模式：

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  • 发表日期：

    2026年

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  • Xunyu Cai,
  • Huili Li,
  • Zicheng Cao,
  • Bisong Li,
  • Jun Han,
  • Xiuxiang Zhu,
  • Qingfeng Zhang,
  • Zuxin Xu,
  • Chongyang Wu

摘要

In deep and ultradeep marine carbonate fields, a number of large oil and gas fields with different types of reservoirs and different accumulation processes have been discovered in China. In this study, the basic conditions, accumulation processes and key reservoir-controlled elements of the Tahe Oil Field, Shunbei Oil and Gas Field, Puguang Gas Field and Yuanba Gas Field, which were discovered in the Tarim Basin and Sichuan Basin, were compared and analyzed. The Tahe Oil Field and Shunbei Oil Field have formed typical paleokarst fracture–cavity reservoirs and fault-controlled fracture–cavity reservoirs under the influence of paleo-uplifts development and strike-slip fault activity. After multistage accumulations and multiple transformations, the planar distribution of oil and gas accumulation in different phases is still regular with some order. Under the influence of the development of Kaijiang–Liangping continental shelf, the Puguang Gas Field and Yuanba Gas Field have formed typical platform-margin reef–shoal–type reservoirs with favorable near-source enrichment accumulation conditions, which have also experienced whole processes of oil and gas phase transformation. Large-scale source–reservoir efficient source and reservoir configurations of the source and reservoirs, and good preservation conditions are important conditions for the formation of deep and ultradeep large oil and gas fields. In the three superimposed basins of Tarim, Sichuan and Ordos, paleokarst reservoirs related to large-scale unconformities, fault-controlled reservoirs related to Multistage faults, platform edge mound-shoal reservoirs related to sedimentary differentiation, and widely distributed paleomicrobial rocks and dolomite reservoirs that developed in confined tidal flat environments, are all important exploration targets.