Quantitative characterization of unconformity migration capacity of the Daliuquan structure in Jizhong Depression,Bohai Bay Basin

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  • 1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
    2.PetroChina Changqing Oilfield Company,Xi’an 710018,China;
    3.PetroChina Huabei Oilfield Company,Renqiu 062552,China

Received date: 2015-05-19

  Revised date: 2015-10-22

  Online published: 2019-09-20

Abstract

Based on the research of the unconformity migration patterns,the unconformity migration capacity was characterized quantitatively.The unconformity hydrocarbon migration is mainly through the connected pore system of the water-entering layer and the pore-crack system of semi-weathered rock layer.Two kinds of divergent migration modes and gathering migration modes exist in the horizontal direction,while two kinds of consequent migration modes and channeling layer migration modes exist in the vertical direction.The unconformity migration capacity is affected jointly by unconformity type,unconformity structure and properties,inclination of unconformity surface,unconformity intersection overlay degree,unconformity scale,distance between oil source and reservoir,hydrocarbon viscosity,hydrocarbon migration motive force and other factors.Based on Darcy’s Law,the quantitative characterization formula of unconformity migration capacity with actual geological significance was established after taking several factors into consideration.The unconformity migration capacity between the third section and the four section of Shahejie Formation of Daliuquan structure of Langgu Sag in Jizhong Depression gradually strengthen from Daxing fault to Niubei slope,and there are three dominant migration paths.The stratigraphic traps on the paths can be favorable exploration targets.The quantitative evaluation results and the actual geological conditions have a good agreement,which shows that the quantitative characterization method of unconformity migration capacity established has good applicability.

Cite this article

Gao Chang-hai, Zha Ming, Chen Li, Zhao Xian-zheng, Jin Feng-ming . Quantitative characterization of unconformity migration capacity of the Daliuquan structure in Jizhong Depression,Bohai Bay Basin[J]. Natural Gas Geoscience, 2016 , 27(4) : 619 -627 . DOI: 10.11764/j.issn.1672-1926.2016.04.0619

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