石油学报 ›› 2006, Vol. 27 ›› Issue (5): 66-70.DOI: 10.7623/syxb200605012

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江陵凹陷深层储层次生孔隙非均质性成因

陈波1, 韩定坤2, 赵海涛1, 赖志云1   

  1. 1. 长江大学油气资源与勘探技术教育部重点实验室, 湖北, 荆州, 434023;
    2. 中国石油化工股份公司中南分公司, 湖南, 长沙, 410117
  • 收稿日期:2005-10-31 修回日期:2006-02-15 出版日期:2006-09-25 发布日期:2010-05-21
  • 作者简介:陈波,男,1967年10月生,1992年获中国地质大学(北京)硕士学位,现为长江大学地球科学学院副教授,主要从事层序地层学与油藏描述方面的研究和教学工作.E-mai:chpo@yangtzeu.edu.cn
  • 基金资助:
    国家自然科学基金项目(No.40173023)资助

Genesis of heterogeneity of secondary pores in deep reservoir of Jiangling Depression

Chen Bo1, Han Dingkun2, Zhao Haitao1, Lai Zhiyun1   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze University, Jingzhou 434023, China;
    2. Sinopec Zhongnan Petroleum Company, Changsha 410117, China
  • Received:2005-10-31 Revised:2006-02-15 Online:2006-09-25 Published:2010-05-21

摘要: 在江陵凹陷埋深超过3 000m的晚白垩纪地层发现了次生孔隙发育的砂岩储层油气藏,次生孔隙以粒间填隙物溶孔为主,但次生孔隙的发育程度存在严重的非均质性,控制了有效油气藏的形成.储层在成岩过程中受地层水pH值变化的影响,经历1~3个世代的胶结或溶蚀作用,其中在晚成岩期油气生成和运移过程中形成的酸性成岩环境对早成岩期生成的碳酸盐岩胶结物和储层中的长石矿物溶蚀,因而产生了大量的次生溶孔,但随后在溶孔中沉淀了不等量的硬石膏,导致了次生孔隙的非均质性.硬石膏胶结物的含量与储层岩石中长石矿物成分的含量密切相关,石英砂岩内硬石膏胶结物含量低,长石砂岩的硬石膏胶结物含量高.造成这种现象的主要原因是储层中长石矿物的溶解为硬石膏在孔隙中的沉淀提供了物质来源.

关键词: 江陵凹陷, 深储层, 次生孔隙, 储层非均质性, 硬石膏胶结物, 长石溶解

Abstract: The reservoirs developing secondary pores over 3000 meters in depth of Jiangling Depression during the late Cretaceous period were found in recent years.The secondary pores mainly resulted from cement dissolution have serious heterogeneity and control the formation of effective oil reservoirs.As pH value varied in the course of diagenesis,reservoirs experienced one to three cementations or dissolution generations.Lots of secondary dissolution pores developed in the late diagenetic stage,because of the acidic mediums in the process of generation and migration of oil and gas.The anhydrites deposited in the dissolved pores resulted in the heterogeneity of secondary pores.The contents of anhydrites cements closely connected with that of the feldspar in reservoir rock.The content of anhydrites cements in quartzose sandstone is low,and the content of that in felspathic sandstone is high.The main cause of such phenomena is that feldspar solution provided sources for the deposition of anhydrites in dissolved pores.

Key words: Jiangling Depression, deep reservoir, secondary pores, reservoir heterogeneity, anhydrite cements, feldspar solution

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