天然气地球科学

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琼东南盆地乐东—陵水凹陷黄流组峡谷水道储层成岩作用与孔隙演化

钟 佳,尤丽,张迎朝,曲希玉,代龙,吴仕玖   

  1. 1.中海石油(中国)有限公司湛江分公司,广东 湛江 524057;
    2.中国石油大学地球科学与技术学院,山东 青岛 266580
  • 收稿日期:2017-11-08 修回日期:2017-12-22 出版日期:2018-05-10 发布日期:2018-05-10
  • 作者简介:钟佳(1987-),男,湖北荆门人,工程师,硕士,主要从事沉积储层研究.E-mail:zhongjiayi007@163.com.
  • 基金资助:
    “十三五”国家科技重大专项“琼东南盆地深水区大中型气田形成条件及勘探关键技术”(编号:2016ZX05026-002);中海石油(中国)有限公司湛江分公司自有科研项目“差异岩—场耦合的储层联控机制与有效储盖分布研究”(编号:ZYKY-2018-ZJ-01)联合资助.
     

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

摘要:

峡谷水道是琼东南盆地增储上产的重要目标,目前乐东—陵水凹陷峡谷水道探明天然气储量占全盆探明储量的70%。为揭示峡谷水道储层形成机理,利用岩石薄片、物性、扫描电镜、黏土X-射线衍射、包裹体等分析资料,研究了乐东—陵水凹陷黄流组峡谷水道储层成岩作用与孔隙演化特征,明确不同区带成岩演化差异,确定峡谷水道成岩共生序列,建立峡谷水道孔隙演化模式。结果表明:峡谷水道储层经历了压实、胶结、溶解等多种成岩作用,现主体处于中成岩A期,成岩共生序列为早期黏土矿物析出→长石微溶蚀→石英次生加大并且长石强烈溶蚀→铁方解石、白云石胶结→石英及其次生加大边溶蚀→碳酸盐胶结物微溶,在崖城A/B区表现为“压实明显减孔,硅质—碳酸盐胶结减孔,长石、铁方解石溶蚀增孔”的演化特点,在陵水Z/X区呈“压实减孔,铁方解石胶结减孔,长英质溶蚀少量增孔”的特征。

关键词: 乐东&mdash, 陵水凹陷, 峡谷水道, 储层, 成岩作用, 孔隙演化

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

中图分类号: 

  • TE122.2


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