The diagenetic facies logging response characteristics of medium-deep reservoirs in the north slope of Baiyun Sag,Pearl River Mouth Basin

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  • 1.Key Laboratory of Petroleum Resources,Gansu Province/ Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Gasfield Development Department,Changqing Oilfield Company,Petrochina,Xi’an 710018,China

Received date: 2017-04-19

  Revised date: 2017-08-13

  Online published: 2017-10-10

Abstract

The deepwater oil and gas resource is abundant and has a great potential of exploration.Baiyun Sag is a hot area of deepwater oil and gas exploration in Pearl River Mouth Basin,north South China Sea.Due to technology and cost conditions,the method of using diagenetic facies logging response characteristics to study reservoirs is one of the effective measures from shallow to the deepwater in offshore oil and gas exploration at present.With the methods of thin sections,casting thin sections,scanning electron microscope,oxygen and carbon isotope analysis,this paper analyzes the basic characteristics of reservoir,typical diagenesis types,diagenetic facies assemblage types and its logging response marks.The study shows that the main diagenesis developed in the medium-deep reservoirs of the north slope of Baiyun Sag is compaction,cementation and dissolution,which are key factors to affect the reservoir physical property.The diagenesis facies of reservoirs in the study area is qualitatively divided into four types,including strong cementation-weak dissolution facies,weak compaction-strong dissolution facies,moderate compaction-strong dissolution facies and strong compaction-weak dissolution facies.Then,based on the analysis of conventional logging curves,such as acoustic transit time log,gamma log and resistivity log,which are sensitive to diagenetic facies,this paper establishes the logging identification standard of deagenetic facies.The final aim of this study is to provide a scientific basis and reference approach for the further oil and gas exploration in deepwater of Baiyun Sag.

Cite this article

Mou Wei-wei,Wang Qi,Tian Bing,Hao Le-wei,Hu Zi-jian . The diagenetic facies logging response characteristics of medium-deep reservoirs in the north slope of Baiyun Sag,Pearl River Mouth Basin[J]. Natural Gas Geoscience, 2017 , 28(10) : 1601 -1612 . DOI: 10.11764/j.issn.1672-1926.2017.08.005

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