Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 46-55.doi: 10.12108/yxyqc.20240505

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Oil and gas migration characteristics of lithologic reservoirs of Neogene Minghuazhen Formation in Bozhong A-2 area，Bozhong Sag

CHENG Yan, WANG Bo, ZHANG Tongyao, QI Yumin, YANG Jilei, HAO Peng, LI Kuo, WANG Xiaodong   

  1. EnerTech-Drilling & Production Co., CNOOC Energy Technology & Services Limited, Tianjin 300452, China
  • Received:2023-09-14 Revised:2023-09-28 Online:2024-09-01 Published:2024-09-04

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Abstract: By analyzing the characteristics of source rocks and comparing the biomarker parameters of crude oil samples from typical wells，the crude oil sources and its migration and accumulation patterns of lithologic reservoirs of the lower Minghuazhen Formation of Neogene in Bozhong A-2 area in the southwest belt of Bozhong Sag were studied. The results show that：（1）The source rocks of the third member of Dongying Formation （E3d3）and the first and third members of Shahejie Formation（E2s1，E2s3）are developed longitudinally in the southwest belt of Bozhong Sag. The source rocks of E3d3 have C19TT predominance，a high Ts abundance value and a “V”-shaped distribution of C27-C28-C29 regular sterane. The source rocks of E2s1 have C23TT predominance， similar Ts and Tm abundance values，a high abundance value of gammacerane and a “L”-shped distribution of C27-C28-C29 regular sterane. The source rocks of E2s3 have C21TT or C23TT predominance，high Ts abundance value，and a “V”-shaped distribution of C27-C28-C29 regular sterane，with C27 predominance.（2）The difference distribution of physical parameters and gas chromatogram of crude oil shows that the filling capacity of crude oil in the southeast well area of Bozhong A-2 reservoir is stronger than that in the middle well area. The C27-C28-C29 regular sterane distributed in a “L” shape and the peak value of 4-methylsteranes is large. In the upper part of the lower Minghuazhen Formation，the C19TT/C23TT is smaller，the MPI1 and MPI2 parameters are larger，total oil has a slightly heavy carbon isotope，indicating that the oil source is mainly supplied by E2s1 and supplemented by E2s3.（3）1-methylphenanthrene，9-methylphenanthrene，C29ααS/（S+R），C29ββ/ αα+ββ），dibenzothiophene series and QGF index parameters change regularly in each well of Bozhong A-2 reservoir，indicating that the crude oil is mainly charged from east to south to northwest. The comparison results of crude oil biomarker show that the deep crude oil in the southwest belt of Bozhong Sag firstly accumulated in Guantao Formation in Bozhong A-4 reservoir，transported vertically to the shallow lower Minghuazhen Formation，and then migrated horizontally along the wide sand bodies to lower Minghuazhen Formation of Bozhong A-2 reservoir，thus forming the current lithologic reservoirs.

Key words: lithologic reservoir, oil-source correlation, hydrocarbon migration pathway, source rocks of Shahejie Formation, carbon isotope, biomarker, Minghuazhen Formation, Bozhong A-2 reservoir, Bozhong Sag

CLC Number: 

  • TE122.1
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