Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 72-79.doi: 10.12108/yxyqc.20220606

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Tectonic characteristics and favorable exploration zones of Paleozoic in Dongpu Sag

YU Haibo1,2   

  1. 1. Research Institute of Geophysical Prospecting, Zhongyuan Oilfield Company, Sinopec, Puyang 457001, Henan, China;
    2. Postdoctoral Research Station, Zhongyuan Oilfield Company, Sinopec, Puyang 457001, Henan, China
  • Received:2022-01-04 Revised:2022-02-23 Online:2022-11-01 Published:2022-11-09

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Abstract: Based on seismic and drilling data， the structure of Dongpu Sag was analyzed， and the favorable exploration zones of Paleozoic were predicted by considering gas generation intensity in the high thermal evolution zones of coal measure source rocks. The results show that：（1）The Dongpu Sag has the evolution characteristics of IndosinianYanshanian compressional zone， Paleogene extensional zone，fault-sag controlled sub-sag in the sedimentary period of Es4-Es3，and strike-slip block in the sedimentary period of Es2，resulting in the structure of multiple faults，multiple protrusions and multiple sub-sags in the Paleogene.（2）The“checker-board”petroleum system was formed in Dongpu Sag under the superposition of multi-phase tectonic stress. The oil and gas in each petroleum system generally has the characteristics of“upper oil and lower gas， early oil and late gas， and continuous accumulation” . On the whole， four types of oil and gas reservoirs were developed， and the oil and gas enrichment model of “near source accumulation，continuous accumulation，and fault controlled enrichment”in weakly modified basins was established.（3）The central area of Dongpu Sag is characterized by weak structural transformation，oil and gas enrichment，and the distribution of Paleozoic residual strata is controlled by the NS compression fault，which is a favorable zone for deep coalbed methane primary reservoirs. In the high thermal evolution area with the source rock as the center， Weicheng-Wenliu structural belt can be selected as favorable exploration zones by using the superposition of multiple reservoiring factors.

Key words: coalbed methane, hydrocarbon accumulation, tectonic evolution, favorable exploration zones, high thermal evolution area, Paleozoic, Dongpu Sag

CLC Number: 

  • TE121.2
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