Marine-continental transitional sedimentation and hydrocarbon accumulation conditionof Cretaceous Yogou Formation in Moul Sag, Niger

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  • 1.Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China;
    2.Engineering and Technology Department,PetroChina Dagang Oilfield Company,Tianjin 300280,China;
    3.Well Test Company,PetroChina Dagang Oilfield Company,Tianjin 300280,China

Received date: 2016-04-25

  Revised date: 2016-06-19

  Online published: 2019-09-19

Abstract

The Termit Basin is a typical marine sedimentary basin of the western African rift system. Marine-continental transition facies sedimentary characteristics have exerted strong impacts on the source-reservoir-cap rocks,hydrocarbon generation,accumulation and distribution of hydrocarbon reservoirs in marine sedimentary basins. The Yogou Formation in Moul Sag is a typical successful example of oil-gas exploration of marine sedimentary basins. Affected by the tectonic subsidence and sea-level change,there are 5 types of sedimentary facies developed in the Yogou Formation,including meandering river delta,braided river delta,far subaqueous fan,hybrid carbonate shelf and offshore. There mainly developed braided river delta and far subaqueous fan in the east,meandering river delta and hybrid carbonate shelf in the west,and neritic and far subaqueous fan in the center of the sag. The sedimentary facies sequence are characterized by “neritic-far subaqueous fan-delta” multi-progressive sequence in vertical evolution,“delta in basin margin-gravity flow in deep water-hybrid carbonate shelf” multi- facies proper match in plane,high quality source rocks and wide spread reservoirs contact closely vertically,material reservoir forming multiple sets of sandwich-like source-reservoir-cap assemblages,providing foundations for oil and gas accumulation;Yogou,Trakes slope and Koulele fastificted area  inherited positive structural zone with the advantage of hydrocarbon migration,accumulation and preservation,which is the next exploration target;YSQ1-YSQ2 HST and YSQ3 LST source-reservoir-seal assemblage in excellent condition,is the target strata exploration. On the basis of these understanding,well placement schemes were optimized,industrial oil flow of Yogou Formation were received in many wells,which has greatly promoted the oil and gas exploration in Termit Basin.

Cite this article

Wang Zhen-sheng, Tang Ge, Su Jun-qing, Hu Jun-gang, Zhou Yu-wen, Wang Guan-qun . Marine-continental transitional sedimentation and hydrocarbon accumulation conditionof Cretaceous Yogou Formation in Moul Sag, Niger[J]. Natural Gas Geoscience, 2016 , 27(7) : 1153 -1163 . DOI: 10.11764/j.issn.1672-1926.2016.07.1153

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