Mapping of oil-source faults in reservoir–cap rock combinations without a source rock

Energy Geoscience

Xu Han¹  Guang Fu²  Qiaoqiao Li²  Mugui Liang² 

[1] Corresponding author.;School of Earth Sciences, Northeast Petroleum University, Daqing, 163318, Heilongjiang, China;

关键词: Reservoir–cap rock combination without a source rock;    Reservoir–cap rock combination with a source rock;    Oil-source fault;    Mapping method;    Banqiao area;   

DOI  :  

来源: DOAJ

【 摘 要 】

Oil and gas exploration near faults in shallow strata is investigated in this study based on an analysis of oil-source faults in reservoir–cap rock combinations without a source rock. The oil-source faults were mapped by superimposition of the distribution area of oil-source faults and the leakage area of cap rocks. This method is applied to the mapping of oil-source faults for two sets of reservoir–cap rock combinations without a source rock in the Banqiao area of the Qikou Sag in the Bohai Bay Basin, eastern China. Combination B is formed by a mudstone cap rock of the middle sub-member of the 1st member of the Shahejie Formation (E3s1M) with its underlying reservoir, while Combination C is formed by a mudstone cap rock of the 2nd member of the Dongying Formation (E3d2) with its underlying reservoir. The results show that the oil-source faults of Combination B are relatively better developed and mainly occur in the northeast and southeast, while those of Combination C are not as well developed and are only distributed at the southeastern edge of the study area with a small proportion in the north. These results are consistent with the fact that oil and gas are mainly distributed near oil-source faults, proving the method proposed is workable in determining the oil-source faults in reservoir–cap rock combinations without a source rock.

【 授权许可】

Unknown