Title: SEDIMENTARY FACIES OF THE ORDOVICIAN MA 5_4 IN THE WESTERN PART OF JINGBIAN PLATFORM
Abstract: The Odors Basin is one of the major hydrocarbon-bearing basins in China with the Ordovician carbonate rocks as the major gas reservoir.The Member Ma5_4 of the Ordovician is a main producing reservoir in the west Jingbian Gas Field of the Basin.As a carbonate dominated reservoir,it is critical to study the reservoir properties for better exploration and development.This paper is devoted to the sedimentary facies of the Ma5_4 member of the west Jingbian Gas Field on the basis of previous studies and the comprehensively use of the present materials including drilling cores,logging and testing data,and the mapping method upon single factor analysis and multifactor analysis.Types of sedimentary facies and their distribution pattern are carefully studied.The Ma5_4 was deposited in a low energy environment of a restricted platform under a dry and hot climate and the sea level was low then.The platform was even exposed to air sometimes.It can be further classified into five microphases: dolomitic flat,gypsum dolomite flat,gypsum-bearing dolomite flat,gypsum dolomite flat and pelitic dolomite flat.There was shifting of microfacies and subfacies from Ma53_4 to Ma15_4 while the sea level rose relatively.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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