石油勘探与开发 >

2018 , Vol. 45 >Issue 1: 62 - 72

DOI: https://doi.org/10.11698/PED.2018.01.06

油气勘探

四川盆地中部侏罗系大安寨段储集层微观结构及油气意义

  • 庞正炼 ,
  • 陶士振 ,
  • 张琴 ,
  • 杨家静 ,
  • 张天舒 ,
  • 杨晓萍 ,
  • 范建玮 ,
  • 黄东 ,
  • 韦腾强
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  • 1. 中国石油勘探开发研究院,北京 100083
    2. 中国石油勘探开发研究院,河北廊坊 065007
    3. 中国石油西南油气田公司勘探开发研究院,成都 610051
庞正炼（1984-）,男,浙江台州人,博士,中国石油勘探开发研究院工程师,从事油气地质及非常规油气方面的研究。地址：北京市海淀区学院路20号,中国石油勘探开发研究院石油地质研究所,邮政编码：100083。E-mail：pangzl@petrochina. com.cn

收稿日期: 2017-08-08

  修回日期: 2017-10-20

  网络出版日期: 2017-12-05

基金资助

国家油气科技重大专项“致密油形成条件、富集规律与资源潜力”（2016ZX05046-001）

收起

Reservoir micro structure of Da’anzhai Member of Jurassic and its petroleum significance in Central Sichuan Basin, SW China

  • PANG Zhenglian ,
  • TAO Shizhen ,
  • ZHANG Qin ,
  • YANG Jiajing ,
  • ZHANG Tianshu ,
  • YANG Xiaoping ,
  • FAN Jianwei ,
  • HUANG Dong ,
  • WEI Tengqiang
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  • 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    2. Research Institute of Petroleum Exploration & Development-Langfang, PetroChina, Langfang 065007, China
    3. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, PetroChina, Chengdu 610051, China;

Received date: 2017-08-08

  Revised date: 2017-10-20

  Online published: 2017-12-05

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摘要

应用岩心分析、铸体和荧光薄片鉴定、常规和场发射扫描电镜观察对四川盆地中部侏罗系大安寨段储集层微观特征进行定性研究,同时借助压汞、纳米CT及氮气吸附定量刻画大安寨段储集层的储集空间尺寸与形态。将大安寨段储集岩分9类,储集空间分4大类14亚类,确定亮晶介壳灰岩是最有利储集岩类。刻画出小于1 µm的储集空间占该储集层储集空间体积的91.27%,形态以缝状为主,并具良好连通性。通过建立储集空间模型,揭示出裂缝为主的微米级储集空间和纳米级孔、缝构成双重介质。储集空间以纳米级为主的大安寨段储集层资源丰度低,井控储量小,形成低产特征,但孔缝双重介质维持了该储集层长期产油,而缝状储集空间及发育的裂缝则是该储集层未采用致密油开发技术亦可规模产油的关键。图10表3参23

关键词： 四川盆地中部; 侏罗系; 大安寨段; 介壳灰岩; 储集空间; 结构特征; 等温吸附; 微纳米孔

本文引用格式

庞正炼 , 陶士振 , 张琴 , 杨家静 , 张天舒 , 杨晓萍 , 范建玮 , 黄东 , 韦腾强 . 四川盆地中部侏罗系大安寨段储集层微观结构及油气意义[J]. 石油勘探与开发, 2018 , 45(1) : 62 -72 . DOI: 10.11698/PED.2018.01.06

Abstract

Based on the qualitative study of microscopic reservoir features using core analysis, cast and fluorescence thin sections inspection, scanning electron microscope (SEM) and field emission scanning electron microscope (FESEM) and quantitative examination of pore size and geometry using mercury injection, nano-CT and nitrogen adsorption, reservoir rock of Da’anzhai Member were divided into 9 types, while storage spaces were divided into 4 types and 14 sub-types. The study shows that sparry shelly limestone is the most promising reservoir type. Pores that smaller than 1 μm in diameter contribute 91.27% of storage space volume. Most of them exhibit slot-like geometry with good connectivity. By building up storage space models, it was revealed that micron scale storage spaces mainly composed of fractures and nanometer scale pores and fractures form multi-scale dual porosity system. Low resource abundance, small single well controlled reserve, and low production are related to the nano-scale pore space in Da’anzhai Memer, whereas the dual-porosity system composed of pores and fractures makes for long-term oil yield. Due to the existence of abundant slot-like pore space and fractures, economic tight oil production was achieved without stimulations.

Key words： Central Sichuan Basin; Da'anzhai Member; shelly limestone; storage space; structure characteristics; multi-scale fractures; isothermal adsorption; micro-nano pore

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