Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 82-91.doi: 10.12108/yxyqc.20230610

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Exploration potential of lithologic reservoirs of Cretaceous AG Formation in Fula Sag,Muglad Basin,Africa

LIU Jiguo, ZHOU Hongpu, QIN Yanqun, ZOU Quan, ZHENG Fengyun, LI Zaohong, XIAO Gaojie   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2023-06-02 Revised:2023-07-10 Online:2023-11-01 Published:2023-11-07

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Abstract: Referring to the domestic exploration theory and technology of lithologic oil and gas reservoirs in fault basins,sequence stratigraphy analysis method was used to carry out multi-scale sequence stratigraphy division,geochemical analysis of source rocks,research on hydrocarbon accumulation rules,favorable zone division and potential evaluation of Fula Sag in Muglad Basin of Central African Rift System. The results show that:（1）Five third-order sequences can be identified based on the sea level changes,and the flooding surface is the most favorable vertical location for lithologic reservoirs.（2）There are three major provenance systems in AG Formation in the study area. Fula-west steep slope belt is short-axis with rapid deposition and narrow distribution of facies zones. Braided river delta system is continuously developed with wide distribution in the northeastern part of the study area,and braided river delta system is limited developed in the southeastern part at the later period. The delta front and beach bar in shore-shallow lacustrine are the most favorable sedimentary facies for lithologic reservoirs.（3）Grey-dark mudstones developed in AG2 member（SQ4 sequence）of AG Formation are mainly deposited in shallow lake to semi-deep lake environment. The kerogen is type Ⅰ-Ⅱ1,the average total organic carbon（TOC）content is 3.41%,and the hydrocarbon generation potential（S1+ S2）is greater than 8 mg/g,which are good-excellent source rocks and the material basis for the forming of structural-lithologic reservoirs.（4）The AG Formation can be divided into seven lithologic reservoirs zones,among which the northern Fula-Moga slope zone has favorable conditions for hydrocarbon accumulation and great exploration potential.

Key words: lithologic reservoirs, flooding surface, delta front, beach bar, lithologic zones, Fula-Moga slope zone, AG Formation, Cretaceous, Fula Sag, Muglad Basin

CLC Number: 

  • TE121.3+1
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