Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 110-125.doi: 10.12108/yxyqc.20230310

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation characteristics and favorable zones prediction in and under source of Paleozoic in Huanghua Depression，Bohai Bay Basin

YANG Runze1, ZHAO Xianzheng2, LIU Haitao1, LI Hongjun2, ZHAO Changyi1, PU Xiugang2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2022-07-19 Revised:2022-08-06 Published:2023-04-25

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Abstract: Coal measure source rocks are the main source rocks of Paleozoic petroleum system in Huanghua Depression，Bohai Bay Basin. Hydrocarbon accumulation mechanism and accumulation process of the in-source and under-source reservoirs are not clear. Based on logging，well log and seismic data，combined with geochemical tests of source rocks，reservoir analysis and testing，inclusion tests，physical simulation experiment，the hydrocarbon accumulation mechanism and accumulation process in and under source of Paleozoic in Huanghua Depression were discussed. The results show that： （1）There is hydrocarbon accumulation in the in-source reservoirs of Paleozoic in Huanghua Depression，the in-source reservoirs are close to the source rocks，and the coal measure oil and gas can be charged preferentially. The stable structural background can make the in-source reservoirs well preserved.（2）Two necessary conditions are met for hydrocarbon accumulation in the Lower Ordovician，the fracture with upper end ending in coal measure and lower end connecting with Ordovician reservoirs， and the low angle fractures have higher transport efficiency. The source-reservoir pressure difference over 10 MPa is a good driving force for hydrocarbon accumulation.（3）The in-source and under-source reservoirs are characterized by accumulation in early and late stage and destroyed in middle stage. In Middle Cretaceous，low-mature crude oil was charged in large quantities. Strong tectonic uplift in Late Cretaceous caused the destruction or adjustment of the ancient oil reservoirs. In Cenozoic，with the further maturity of hydrocarbon source rocks，generation and expulsion of hydrocarbons，a large amount of coal gas and light oil accumulated and formed reservoirs.（4）The relatively stable areas with high-quality reservoirs developed within the range of hydrocarbon generation in the study area are favorable areas for in-source oil and gas exploration，while the areas where the Indosinian thrust faults developed and were weakly modified by later extension are favorable exploration areas for under-source oil and gas exploration.

Key words: coal measure source rock, accumulation in the source, accumulation under the source, source-reservoir pressure difference, hydrocarbon accumulation mechanism, Paleozoic, Huanghua Depression, Bohai Bay Basin

CLC Number: 

  • TE122.2
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