Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 57-70.doi: 10.12108/yxyqc.20240406

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Accumulation mechanism of overpressured lithologic reservoirs of the third member of Paleogene Shahejie Formation in northern Dongpu Sag

ZHANG Lei1,2, LI Sha3, LUO Bobo1,2, LYU Boqiang1,2, XIE Min1,2, CHEN Xinping1,2, CHEN Dongxia3, DENG Caiyun1,2   

  1. 1. Research Institute of Exploration and Production, Zhongyuan Oilfield Company, Sinopec, Puyang 457001, Henan, China;
    2. Zhongyuan Oilfield Branch Company, Sinopec, Puyang 457001, Henan, China;
    3. National Key Laboratory of Petroleum Resources and Engineering, Beijing 102249, China
  • Received:2023-08-18 Revised:2023-12-06 Online:2024-07-01 Published:2024-07-04

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Abstract: The processes of hydrocarbon generation，migration and accumulation are complex with tight reservoirs and widespread overpressure in the deep area of Dongpu Sag. A systematic study was conducted on the formation mechanism of overpressure，the effects of overpressure on source rocks and reservoirs，as well as the dynamics of hydrocarbon migration in the third member of Paleogene Shahejie Formation in northern Dongpu Sag by using wire-logging，mud-logging，drilling，and geochemical analysis data，and the accumulation mechanisms of deep overpressured lithologic reservoirs were elucidated. The results show that：（1）There are five types of overpressured lithologic reservoirs of the third member of Paleogene Shahejie Formation in northern Dongpu Sag， which are three pure lithologic reservoirs and two compound reservoirs. The pure lithologic reservoirs include updip pinch-out sandstone reservoirs，sand lens reservoirs and fractured reservoirs，while the compound reservoirs are lithologic-structural reservoirs and structural-lithologic reservoirs. The lithologic reservoirs are mainly distributed in the northern Dongpu Sag，especially around Qianliyuan subsag，Haitongji subsag，Liutun subsag and PuchengWeicheng subsag，with the characteristics of“orderly distribution around sags”.（2）The deep overpressure caused by the thick gypsum salt rocks and the process of hydrocarbon generation in the study area can inhibit the hydrocarbon generation of source rocks，effectively enlarging the oil generation window，enhancing the hydrocarbon generation ability of deep source rocks，and promoting large-scale near source hydrocarbon supply to lithologic reservoirs around the sag. The distribution of high-quality reservoirs is controlled by gypsum salt rocks，rapid burial in the early stage，anti-compaction of overpressure and dissolution in the late stage. The synergistic action of overpressure and buoyancy widely developed in the deep，provides an effective driving force for deep oil and gas migration.（3）The hydrocarbon accumulation model of the eastern sag belt in the study area is“single sag with single source，early miscible phase and late gas phase charging，self-generating and self preserving，hydrocarbon migration and accumulation driven by overpressure”. The hydrocarbon accumulation model of the eastern steep slope zone is“single sag with multi-source，early miscible phase and late gas phase charging，lateral hydrocarbon migration and accumulation driven by overpressure and buoyancy”. The hydrocarbon accumulation model of the western slope zone is“single sag with multi-source，oil phase charging，lateral hydrocarbon migration and accumulation driven by overpressure and buoyancy”. The hydrocarbon accumulation model of the western sag belt is“single sag with single source，oil phase charging，lateral hydrocarbon migration and accumulation driven by overpressure and buoyancy”.

Key words: lithologic reservoir, near source hydrocarbon supply, gypsum salt rock, overpressure drive, buoyancy drive, lateral hydrocarbon migration and accumulation, the third member of Shahejie Formation, Paleogene, Dongpu Sag

CLC Number: 

  • TE122.1
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