摘要
脆性指数是致密砂岩储层评价的重要参数,准确计算脆性指数为储层改造参数优化及"甜点"优选提供依据。通过岩石薄片鉴定和X射线衍射全岩分析,研究致密砂岩脆性矿物特征,提出利用"(石英+碳酸盐)含量/矿物总量"计算岩石脆性指数。结果表明合水地区主力层位三叠系延长组长63的脆性指数主要为50%~65%,平均为56.3%,与岩石力学测量值的符合率较高。高石英含量是形成长6段致密砂岩高脆性指数的主要原因,脆性指数>60%的储层大面积分布,利于体积压裂改造。
Brittleness index is one of the important parameters for reservoir evaluation of tight sandstone. Accurate computation of the parameter is helpful for optimizing reservoir stimulation parameters and optimal selection of hot spots. The characteristics of brittle minerals in tight sandstone are studied on the basis of identification of thin section and X ray crystallography, a method of computing brittleness index by the formula of (quartz 4-carbonate)/total mineral content, is proposed. It shows that the brittleness index of the main oil bearing sub layer Chang 63 in Heshui areais high, ranging from 50%to 65%, with an average value of 56.30/00, coincident with rock mechanics measured value. High contents of quartz are the main reason for the high Iorittleness index in the Chang 63 tight sandstone. Large scale distriloution of reservoir with the Iorittleness index over 60% is suitalole for the reformation of volume crush.
作者
王晓东
王一航
王永田
尤源
王成玉
WANG Xiaodong;WANG Yihang;WANG Yongtiane;YOU Yuan;WANG Chengyu(The Seventh Oil Production Plant,Changqing Oil field Corrzpany of PetroChina,Xi'an 710200,China;The Eighth Oil Production Plant,Changqing Oil field Corrzpany of PetroChina,Xi'an 710200,China;Eccploration and Development Research Institute,Changqing Oil field Corrzpany of PetroChina,Xi'an 710018,China)
出处
《成都理工大学学报(自然科学版)》
CAS
CSCD
北大核心
2018年第3期367-373,共7页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家重点基础研究发展计划"973"项目(2014CB239003)
关键词
岩石矿拘法
脆性指数
延长组
致密砂岩
石英分量
mineral rock method
brittleness index
Yanchang Formation
tight sandstone
quartzcontent