Natural Gas Origin and Influence on Oil Well Productivity in Jurassic Da′anzhai Formation,Western Part of Central Sichuan Basin

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  • 1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;
    2.Sichuan Key Laboratory of Natural Gas Geology,Chengdu 610500,China

Received date: 2014-01-16

  Revised date: 2014-09-11

  Online published: 2015-01-10

Abstract

Wells with high gas oil ratio of Jurassic Da′anzhai Formation are widely distributed in the western part of Central Sichuan Basin,where oil wells are also mainly distributed.Study on natural gas origin is helpful to understand the hydrocarbon enrichment regularity in Jurassic Da′anzhai Formation,central Sichuan Basin.Based on the comparison of natural gas compositions and carbon isotopes between Da′anzhai Formation and Upper Triassic Xujiahe Formation,combined with the characteristics of condensate light hydrocarbons of Da′anzhai Formation,it suggests that gas of high oil gas ratio wells is characterized by humic or near-humic origin which is similar to the gas from Xujiahe Formation.The mixture of sapropelic gas from Da′anzhai Formation with humic gas from Xujiahe Formation leads to high gas oil ratio wells in Da′anzhai Formation,western part of Central Sichuan Basin.On one hand,when the faults crossed the Da′anzhai Formation,light hydrocarbons in the primitive reservoir of Da′anzhai dissolved in the gas injection from underlying Xujiahe Formation and migrated to the upper formation.On the other hand the injected gas caused deasphalting to fill the reservoir′s pores and fractures,which leads to poor exploration effects near faults.

Cite this article

CHEN Shi-jia,WANG Li,YAO Yi-tong,HUANG You-lin,LU Jun-gang,LIU Chao-wei,ZHANG Huan-xu,ZHANG Xiao-wen . Natural Gas Origin and Influence on Oil Well Productivity in Jurassic Da′anzhai Formation,Western Part of Central Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(1) : 102 -109 . DOI: 10.11764/j.issn.1672-1926.2015.01.0102

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