非常规天然气

东营凹陷西部沙三下亚段—沙四上亚段泥页岩岩相及储层特征

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  • 1.中国石油大学地球科学与技术学院,山东 青岛 266580;2.中国石化胜利油田物探研究院,山东 东营 257022
张顺(1985-),男,山东淄博人,博士研究生,主要从事沉积学及储层地质学研究.E-mail:satisfactoryshun@163.com.

收稿日期: 2014-01-26

  修回日期: 2014-05-08

  网络出版日期: 2015-02-10

基金资助

国家自然科学基金项目(编号:41372107)资助.
 

Characteristics of Shale Lithofacies and Reservoir Space in the 3rd and 4th Members of Shahejie Formation,the West of Dongying Sag

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  •  
    (1.College of Geo-Resources and Information in China University of Petroleum,Qingdao 266580,China;
    2.Geophysical Research Institute of Shengli Oilfield,Dongying 257022,China)

Received date: 2014-01-26

  Revised date: 2014-05-08

  Online published: 2015-02-10

摘要

通常看似简单的泥页岩其实是包含多种岩石类型的复杂的岩石组合,泥页岩的岩相是导致其物性变化、油气差异分布的根本因素。通过岩心精细观察描述、薄片鉴定、X-射线衍射分析、扫描电镜分析等技术,综合矿物成分、沉积构造、有机质丰度、颜色以及其他混入物等因素,建立了一套适合东营凹陷西部泥页岩的岩相划分方案。富有机质纹层状灰岩、中有机质纹层状细粒混合沉积岩、富有机质层状黏土岩、富有机质(钙质)夹层状灰岩以及贫有机质块状细粒混合沉积岩等是其中最为发育的5种岩相类型。构造缝、超压缝、层间缝、矿物收缩缝、溶蚀孔、黏土矿物晶间孔及方解石重结晶晶间孔等是主要的储集空间类型。综合岩相特征、储层特征及钻井试油数据,确定了富有机质夹层状灰岩、富有机质纹层状灰岩及富有机质层状黏土岩为优势有利岩相。可能的优势有利岩相厘定是泥页岩勘探的重要基础。

本文引用格式

张顺,陈世悦,鄢继华,谭明友,张云银,龚文磊,王光增 . 东营凹陷西部沙三下亚段—沙四上亚段泥页岩岩相及储层特征[J]. 天然气地球科学, 2015 , 26(2) : 320 -332 . DOI: 10.11764/j.issn.1672-1926.2015.02.0320

Abstract

Shale lithofacies is the main factor leading to the change of its physical properties and internal oil-gas distribution.Though usually seemed simple,fine-grained deposits actually contain complex rock types.This paper,using detailed description of core,thin sections identification,analysis of whole rock X-ray diffraction and scanning electron microscopy technologies,based on integrating various factors,such as mineral composition,sedimentary structure,organic matter abundance,color and other foreign matters,sets up a lithofacies classification scheme that is suitable for the shale in the 3rd and 4th members of Shahejie Formation in the west part of Dongying area.The most developed five types of lithofacies include organic-rich laminated limestone,organic-rich calcareous inter-bedded limestone,organic-contained fine-grained mixed sedimentary rocks,organic-lean massive clay stone and organic-rich laminated clay stone.And in those fine-grained deposits,the following reservoir space types are mainly developed,including structural,abnormal pressure and inter-laminar fracture,dissolution and inter-granular pores of clay mineral and inter-granular pores of calcite layer etc.Based on the above lithofacies and reservoir space analysis,the intercalation of limestone,laminated limestone and clay stone were identified as advantaged lithofacies in this area,which forms the basis of the exploration of the shale in this area.

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