石油勘探与开发 >

2017 , Vol. 44 >Issue 4: 531 - 539

DOI: https://doi.org/10.11698/PED.2017.04.06

油气勘探

四川盆地南部深层五峰组—龙马溪组裂缝孔隙评价

  • 王玉满 ,
  • 王宏坤 ,
  • 张晨晨 ,
  • 李新景 ,
  • 董大忠
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  • 1. 中国石油勘探开发研究院,北京100083;
    2. 中国石油大学（北京）,北京102249
王玉满（1968-）,男,湖北荆门人,博士,中国石油勘探开发研究院高级工程师,主要从事沉积储集层与非常规油气地质研究。地址：北京海淀区学院路20号,中国石油勘探开发研究院石油地质实验研究中心,邮政编码：100083。E-mail：wangyuman@petrochina.com.cn

修回日期: 2016-12-16

  网络出版日期: 2017-07-27

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Fracture pore evaluation of the Upper Ordovician Wufeng to Lower Silurian Longmaxi Formations in southern Sichuan Basin, SW China

  • WANG Yuman1 ,
  • WANG Hongkun2 ,
  • ZHANG Chenchen1 ,
  • LI Xinjing1 ,
  • DONG Dazhong1
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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China University of Petroleum (Beijing), Beijing 102249, China

Revised date: 2016-12-16

  Online published: 2017-07-27

Supported by

国家科技重大专项（2017ZX05035001-001）; 中国科学院A类战略性先导科技专项（XDA01010103）; 中国石油勘探与生产分公司页岩气资源评价与战略选区课题（101016kt1012001b24）

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摘要

根据川南坳陷中部和北部5口评价井资料,对四川盆地南部深层上奥陶统五峰组—下志留统龙马溪组海相页岩进行裂缝孔隙的多方法识别和定量评价,初步揭示了川南坳陷深层五峰组—龙马溪组页岩储集特征。形成4点认识：①在川南坳陷中部深层,无论是局部构造高点、翼部还是低部位,五峰组—龙马溪组产层储集空间均以基质孔隙为主,微裂缝总体不发育,与长宁、威远和涪陵气田的基质孔隙相近;②在川南坳陷北部深层,五峰组—龙马溪组黑色页岩段以基质孔隙为主,裂缝孔隙主要分布于局部不连续的深度点,总孔隙度为3.5%~6.7%,平均值为5.3%,裂缝孔隙度为0~2.1%,平均值为0.3%;③川南坳陷中部和北部五峰组—龙马溪组产层裂缝孔隙欠发育,并以大面积基质孔隙型为主,间接说明该地区构造活动相对较弱,对页岩储集层改造作用不及四川盆地东部涪陵地区;④寒武系膏盐岩的发育规模与分布特征是五峰组—龙马溪组裂缝孔隙发育的关键控制因素。研究认为,L7井区、Gs1井区、四川盆地东部、鄂西等地区寒武系膏盐层厚度大且分布稳定,五峰组—龙马溪组“甜点层”在燕山期以来的盐底滑脱构造中易形成裂缝孔隙发育段,是川南坳陷及其周边深层裂缝孔隙发育的潜在有利地区。图7表2参21

关键词： 四川盆地; 川南坳陷; 页岩气; 上奥陶统五峰组; 下志留统龙马溪组; 基质孔隙; 裂缝孔隙; 膏盐层; 滑脱变形

本文引用格式

王玉满 , 王宏坤 , 张晨晨 , 李新景 , 董大忠 . 四川盆地南部深层五峰组—龙马溪组裂缝孔隙评价[J]. 石油勘探与开发, 2017 , 44(4) : 531 -539 . DOI: 10.11698/PED.2017.04.06

Abstract

The reservoir characteristics of the Upper Ordovician Wufeng-Lower Silurian Longmaxi Formations in southern Sichuan Basin were preliminarily revealed in this study by identifying and quantitatively evaluating the fracture pores of five appraisal wells in the central and northern parts of the southern Sichuan Depression by several methods. Four conclusions were reached as follows: (1) In the central zone of the Depression, the deep reservoir space of the Wufeng-Longmaxi producing pay is composed mainly of matrix pores and the microcracks are not common, whether on the local structural highs, flanks or lows. The physical properties are similar to that of the matrix pores in Changning, Weiyuan and Fuling gas fields. (2) In the northern zone of the Depression, the deep reservoir space of the Wufeng-Longmaxi black shale is composed mainly of matrix pores, and fracture pores mainly occur in local discrete intervals, with a total porosity range from 3.5% to 6.7%, on average 5.3%, and fracture porosity of 0-2.1%, on average 0.3%. (3) In the central and northern parts of the southern Sichuan Depression, the Wufeng-Longmaxi producing pays have undeveloped fracture pores and chiefly extensively distributed matrix pores, indirectly indicating relatively stable tectonic activities and corresponding weaker reservoir reworking there than Fuling field located in eastern Sichuan Basin. (4) The size and distribution of the gypsum-salt layer in the Cambrian are the key controlling factors of fracture pore development in the Wufeng-Longmaxi Formations. Therefore, the areas including Wellblocks L7, GS1, eastern Sichuan Basin and western Hubei province, where gypsum-salt layer in the Cambrian is thick and stable, and fracture intervals are likely to occur in the Wufeng-Longmaxi producing pay controlled by decollement structure above salt structure since the Yanshan Movement, are the potential favorable areas for fracture pore development.

Key words： Sichuan Basin; southern Sichuan Depression; shale gas; Upper Ordovician Wufeng Formation; Lower Silurian Longmaxi Formation; matrix pore; fracture pore; gypsum-salt layer; decollement

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