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Different Transformation Behaviors of Natural Gas  and Significance for Gas Accumulation in Yinggehai Basin

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  • 1.The Resource Institute,China University of Geosciences,Beijing 100083,China;
    2.Key Laboratory for HydrocarbonAccumulation in Petroleum University,Ministry of Education,Beijing 102249,China;
    3.CNOOC Ltd.,Zhanjiang 524057,China

Received date: 2011-03-17

  Revised date: 2011-05-08

  Online published: 2011-08-10

Abstract

Yinggehai basin is a Cenozoic extended and transformational sedimentary basin.This unique geological condition causes the different behaviors of gas migration and accumulation.These different behaviors are displayed in the basinal scale,zone scale and transformation scale.The tree-shape transformation system in the central diapirs belt made the deep natural gas migrate alone the mud\|fluid diaper faults and accumulate the surrounding shallow and moderate deep sandstone reservoir at the top of diapirs or its surrounding.The transformation pathway is the vertical conductive fault and fissure.Yingdong slope as a complex transformation system is composed of sand body,unconformity and faults.The transformation system in the Yingdong slope is characterized as segmentation distribution associated with the gradual increase of conductive performance among northern,middle and southern sections in turns.These different transformation behaviors in the extended and transformational sedimentary basin obviously control the natural gas migration and accumulation.The tree-shape on mud-fluid transformation system is favorable of natural gas accumulation around the diapirs.The composite transformation system caused the natural gas migration and accumulation through the different pathways in the Yingdong slope,and the behaviors of natural gas migration and accumulation at each segment in the Yingdong slope were different.

Cite this article

JIN Bo, ZHANG Jin-Chuan, LIU Zhen, LI Xu-Shen . Different Transformation Behaviors of Natural Gas  and Significance for Gas Accumulation in Yinggehai Basin[J]. Natural Gas Geoscience, 2011 , 22(4) : 642 -648 . DOI: 10.11764/j.issn.1672-1926.2011.04.642

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