Diagenetic fluid type and activity history of controlling the development of abnormal pore zone: Taking the north margin of Baodao Sag,Qiongdongnan Basin as an example

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  • 1.Key Lab of Tectonics and Petroleum Resource of Educational Ministry,China University of Geosciences,Wuhan 430074,China;
    2.Hebei GEO University,College of Resources,Shijiazhuang 050031,China;
    3.Geophysical Exploration Research Institute of PetroChina Huabei Oilfield Company,Renqiu 062552,China;
    4.Zhanjiang Branch,CNOOC China Limited,Zhanjiang 524057,China

Received date: 2015-09-11

  Revised date: 2015-10-26

  Online published: 2019-09-10

Abstract

Based on geological background and abundant drilling data,by means of fluid inclusion analysis technique and the geochemical characteristics of diagenetic minerals,this paper has studied the dynamic formation process of abnormal high pore zones in the eastern Qiongdongnan Basin with perspective of pore fluid source and evolution.There are three abnormal high porosity zones.The previous two zones develop in whole region and the third one only develops in BD19-2 structure.Organic acid,atmospheric fresh water,hydrocarbon,thermal fluid and mantle-derived CO2 are recognized as the geological fluids which affect porosity zones.The leaching of meteoric water during stage of structure uplift in the Miocene and the dissolution of organic acid from source rocks has combined to cause the development of the first abnormal high porosity zone.The dissolution of organic acid in the Middle and Late Miocene,the inhibitor of development of carbonate cements for hydrocarbon filling in Late Miocene and the dissolution of thermal fluid activity in late stage have combined to cause the development of the second zone.The dissolution of organic acid in the late Oligocene,the inhibitor of development of carbonate cements for hydrocarbon filling in the Middle Miocene and the dissolution of thermal fluid which contains mantle-derived CO2 activity in late stage have combined to cause the development of the third zone.

Cite this article

Su Ao, Du Jiang-min, Chen Hong-han, Yu Yan, Lei Ming-zhu . Diagenetic fluid type and activity history of controlling the development of abnormal pore zone: Taking the north margin of Baodao Sag,Qiongdongnan Basin as an example[J]. Natural Gas Geoscience, 2016 , 27(10) : 1837 -1847 . DOI: 10.11764/j.issn.1672-1926.2016.10.1837

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