尼日尔三角洲盆地油气分布特征及控制因素

doi:10.11743/ogg20050319

Abstract

Abstract:

Evolution of Niger delta basin can be divided into two stages.During the early stage,i.e.early Cretaceous,embryonic Niger delta has been formed,and the thermal uplifting associated with volcanic activities has provided heat sources for maturation of Tertiary organic matters.During the late stage,i.e.,Paleocene to Eocene,the framework of Niger delta has been basically finalized,with many growth faults and associated rollover anticlines being developed.The rollover anticlines basically can be divided into 4 types:1) simple rollover anticline;2) rollover anticlines that have been formed by the joint action of two or more growth faults and the master fault;3) rollover anticlines that have been formed by the joint action of one or more antithetic (north-dipping) faults and the master fault; 4)cave-in structures on top of rollover anticlines,due to the uplifting of shale.Most of the reservoirs,mainly of structural type,are related to the rollover anticlines associated with growth faults,and reservoirs of non-structural trap type have also been developed.The major controlling factors of hydrocarbon accumulation in Niger delta include the very thick inherited delta deposits,good hydrocarbon generating conditions,stable and well-developed reservoirs and seals,as well as! faults acting as the major migration pathways.

Key words: oil and gas distribution, controlling factor, structural reservoir, Niger delta

CLC Number:

TE112.11

Hou Gaowen, Liu Hefu, Zuo Shengjie. A study of distribution characteristics of petroleum in Niger delta basin and their controling factors[J]. Oil & Gas Geology, 2005, 26(3): 374-378.

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A study of distribution characteristics of petroleum in Niger delta basin and their controling factors

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