石油勘探与开发 >

2019 , Vol. 46 >Issue 1: 89 - 99

DOI: https://doi.org/10.11698/PED.2019.01.08

油气勘探

柴达木盆地坪西地区副变质岩储集层特征

  • 夏志远 ,
  • 刘占国 ,
  • 李森明 ,
  • 张永庶 ,
  • 王波 ,
  • 田明智 ,
  • 伍劲 ,
  • 邹开珍
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  • 1. 中国石油杭州地质研究院,杭州 310023;
    2. 中国石油青海油田公司勘探开发研究院,甘肃敦煌 736202
夏志远（1983-）,男,安徽庐江人,现为中国石油杭州地质研究院高级工程师,主要从事层序地层与沉积储集层方面研究。地址：杭州市西湖区西溪路920号,中国石油杭州地质研究院石油实验所,邮政编码：310023。E-mail：xiazy_hz@petrochina.com.cn

收稿日期: 2018-06-08

  修回日期: 2018-11-03

  网络出版日期: 2018-12-17

基金资助

国家“十三五”科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”（2017ZX05001-002）; 中国石油科技重大专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”（2016E-01-02）

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Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China

  • XIA Zhiyuan ,
  • LIU Zhanguo ,
  • LI Senming ,
  • ZHANG Yongshu ,
  • WANG Bo ,
  • TIAN Mingzhi ,
  • WU Jin ,
  • ZOU Kaizhen
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  • 1. PetroChina Hangzhou Research Institute of Petroleum, Hangzhou 310023, China;
    2. Research Institute of Petroleum Exploration and Development, PetroChina Qinghai Oil Field Company, Dunhuang 736202, China

Received date: 2018-06-08

  Revised date: 2018-11-03

  Online published: 2018-12-17

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摘要

基于岩心、薄片、扫描电镜与测井等资料,运用全岩X光衍射、微米CT扫描方法,系统分析了柴达木盆地坪西地区副变质岩储集层特征。研究区副变质岩储集层岩石类型主要有板岩、钙质片岩和结晶灰岩3种,原岩为奥陶系—志留系的海相碎屑岩与碳酸盐岩。3类副变质岩储集层发育3大类6亚类储集空间类型,第1类为裂缝,包括构造缝、风化节理缝和溶蚀缝;第2类为溶蚀孔隙,包括溶孔和溶洞;第3类为纳米级晶间孔隙。受裂缝的发育程度和类型控制,3类副变质岩储集层孔喉的数量、体积和半径存在显著的差异。坪西地区副变质岩储集层成因于变质、风化、构造碎裂和溶蚀4种地质作用,其中变质作用对副变质岩类储集层形成具重要的建设作用,可打破传统局限于寻找顶部风化壳的束缚。副变质岩储集层形成经历了5个主要演化阶段,其分布受控于岩石类型、变质程度、古地貌和风化强度。图12表2参22

关键词： 柴达木盆地; 坪西地区; 副变质岩; 储集层; 岩石类型; 孔喉特征; 储集层成因; 储集层分布

本文引用格式

夏志远 , 刘占国 , 李森明 , 张永庶 , 王波 , 田明智 , 伍劲 , 邹开珍 . 柴达木盆地坪西地区副变质岩储集层特征[J]. 石油勘探与开发, 2019 , 46(1) : 89 -99 . DOI: 10.11698/PED.2019.01.08

Abstract

Based on core, thin-section, scanning electron microscopy (SEM) and well logging data, the characteristics of the parametamorphic rock reservoirs in the Pingxi area were analyzed by means of whole rock X-ray diffraction and micron CT scanning. The parametamorphic rock reservoirs mainly had three types of rocks: slate, crystalline limestone and calc-schist; the original rocks were Ordovician-Silurian marine clastic and carbonate rocks. The three types of parametamorphic rock reservoirs developed three types and six sub-types of reservoir space. The first type of reservoir space was fractures, including structural, weathered and dissolution fractures; the second type was dissolved porosities, including dissolved pores and caves; the third type was nano-sized intercrystalline porosities. The three types of parametamorphic rock reservoirs were different widely in the quantity, volume and radius of pore-throats, and were strongly affected by the type and development degree of fractures. The parametamorphic rock reservoirs were formed by metamorphism, weathering, structural fragmentation and dissolution. Metamorphism reformed the parametamorphic rock reservoirs significantly, breaking the traditional constraint of finding weathering crust at top. The parametamorphic rock reservoirs experienced five formation stages, and their distribution was controlled by rock type, metamorphic degree, ancient geomorphology, and weathering intensity.

Key words： Qaidam Basin; Pingxi area; parametamorphic rock; reservoir; rock type; pore throat characteristics; reservoir formation; reservoir distribution

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