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Diagenesis and porosity evolution of the Huangliu Formation canyon-channel reservoir in Ledong-Lingshui Sag,Qiongdongnan Basin

Zhong Jia,You Li,Zhang Ying-zhao,Qu Xi-yu,Dai Long,Wu Shi-jiu   

  1. 1.China National Offshore Oil Limited Corporation-Zhanjiang,Zhanjiang 524057,China;2.School of Geosciences in China University of Petroleum,Qingdao 266580,China
  • Received:2017-11-08 Revised:2017-12-22 Online:2018-05-10 Published:2018-05-10

Abstract:

The canyon-channel is a kind of important target for increasing reserves in Qiongdongnan Basin.Currently,the proved gas reserves of canyon channels in Ledong-Lingshui Sag has taken up 70% of the total proved storage in whole Qiongdongnan Basin.In order to analyze formation mechanism of canyon-channel,based on rock thin section,petrophysics data,scanning electron microscope(SEM),clay X-ray diffraction,fluid inclusion,as well as other data,the diagenesis and porosity evolution of the Huangliu Formation canyon-channel reservoir have been studied,the difference of diagenetic evolution in various areas has been ascertained,the paragenetic sequence has been confirmed,pore evolution mode for canyon-channel has been eventually built.The results show that canyon-channel sandstones have experienced compaction,cementation,dissolution,and other diagenesis processes,and now are in mesodiagenesis A stage.The diagenetic sequence was:early clay mineral precipitation;feldspar microdissolution;quartz overgrowth and feldspar intense dissolution;ferrocalcite and dolomite cementation;quartz and quartz overgrowth dissolution;microdissolution of carbonate cement.Besides,the porosity evolution in Yacheng A/B area displays characteristics of “obvious porosity reduction via compaction;porosity reduction via sillceous and carbonate cement,porosity increase via dissolution of feldspar and ferrocalcite” and the porosity evolution in Lingshui Z/X area shows the features of “porosity reduction via compaction;porosity reduction via ferrocalcite cementation;slight porosity increase via dissolution of felsic”.

Key words: Ledong-Lingshui Sag, Canyon channel, Reservoir, Diagenesis, Porosity evolution

CLC Number: 

  • TE122.2


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