天然气地球科学

• 天然气地质学 • 上一篇    下一篇

超低渗透储层钙质夹层分布控制因素分析——来自岩石学及成岩作用研究的微观证据

刘丽1,鲍志东2,秦智3,范正平3,林艳波3,邓西里1,安锴胜3   

  1. 1.中国石油天然气股份有限公司勘探开发研究院,北京 100083;
    2.中国石油大学(北京)地球科学学院,北京 102249;
    3.中国石油天然气股份有限公司长庆油田分公司第五采油厂,陕西 西安 710018
  • 收稿日期:2015-07-10 修回日期:2015-12-25 出版日期:2016-06-10 发布日期:2016-06-10
  • 通讯作者: 鲍志东(1964-),男,安徽巢湖人,教授,主要从事沉积储层地质研究. E-mail:baozhd@cup.edu.cn.
  • 作者简介:刘丽(1985-),女,辽宁葫芦岛人,博士研究生,主要从事储层地质综合研究. E-mail:liuli11505@163.com.
  • 基金资助:
    中国石油重大科技专项(编号:2011B-1205)资助.

Controlling factors of calcareous interlayers distribution in ultra-low permeability reservoirs:Micro evidence from petrology and diagenesis

Liu Li1,Bao Zhi-dong2,Qin Zhi3,Fan Zheng-ping3,Lin Yan-bo3,Deng Xi-li1,An Kai-sheng3   

  1. 1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
    2.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    3.The 5th Oil Production Plant,Changqing Oilfield Company,PetroChina, Xi’an 710018,China
  • Received:2015-07-10 Revised:2015-12-25 Online:2016-06-10 Published:2016-06-10

摘要: 利用岩心、常规测井、铸体薄片、扫描电镜等资料,确定姬塬油田长6段钙质夹层岩电特征和分布规律,依据钙质砂岩和非钙质砂岩之间沉积和成岩的差异性,探讨岩石学特征和成岩演化过程对钙质夹层分布的影响。结果表明:钙质夹层的分布与沉积微相和砂泥岩组合类型密切相关,宏观上受砂泥岩厚度以及砂体的成因类型控制,微观上受碳酸盐胶结物来源和孔隙空间的综合影响。胶结物来源的充足程度与砂岩周围暗色泥岩的厚度以及砂泥岩距离密切相关;孔隙空间的大小受砂体岩石学特征和后期成岩演化的双重控制,刚性颗粒含量高、粒度粗、分选好的砂岩,原生孔隙发育,碳酸盐胶结时期孔隙空间较大,利于钙质夹层的形成;早期压实和绿泥石胶结作用减少孔隙空间,是阻碍碳酸盐沉淀的关键成岩作用。三角洲前缘储层中靠近厚层泥岩、原生粒间孔隙发育且未经历强烈压实和绿泥石胶结作用改造的沉积相带容易发生碳酸盐胶结形成钙质夹层。

关键词: 钙质夹层, 岩石学特征, 成岩演化过程, 物质来源, 孔隙空间

Abstract: Using on the analysis of core,conventional logs,thin section,scanning electron microscopy,etc.,the petrologic and geochemical features,log responses and distribution laws of calcareous interlayers of Chang 6 Formation were studied in Jiyuan Oilfield,then based on  the difference between calcareous and non-calcareous,sandstones was identified to discuss how petrology and diagenesis evolution affect their distribution.The results show that the distribution of calcareous interlayers was closely related to sedimentary microfacies and rock assemblages.It is closely related to the thickness of sandstones and mudstones macroscopically,as well as the genetic types of sandbodies.However,it is comprehensively controlled by the source and pore spaces needed for carbonate cementationin microscopic scales.The thickness of sandstone and the distance between mudstones and sandstones determines the adequacy of material sources.The pore spacesare affected both by petrology and diagenetic evolution.Sandstones which have coarse granularity,good sorting,and high rigid particles can preserve the pore space effectively,so it is likely for the carbonate cement to precipitate.In addition,the space is seriously influenced by the diagenetic alteration.Early compaction and chlorite rim cementation may cause the reduction of space,and they are the dominant diagenesis inhibiting the growth of carbonate.For delta front reservoir,the sandstone near thickmudstone,with higher primary intergranular porosity and lower degree of compaction and chlorite cementation,is prone to be cemented by carbonate.

Key words: Calcareous interlayer, Petrology, Diagenesis, Material sources, Pore spaces

中图分类号: 

  • TE122

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