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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2018-03
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A method of computing brittleness index of sandstone by mineral content:A case study of Chang-6 tight sandstone reservoir in Heshui,Ordos Basin,China

WANG Xiaodong;WANG Yihang;WANG Yongtian;YOU Yuan;WANG Chengyu;The Seventh Oil Production Plant,Changqing Oilfield Company of PetroChina;The Eighth Oil Production Plant,Changqing Oilfield Company of PetroChina;Exploration and Development Research Institute,Changqing Oilfield Company of PetroChina;  
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+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 56.3%,coincident with rock mechanics measured value.High contents of quartz are the main reason for the high brittleness index in the Chang-63 tight sandstone.Large scale distribution of reservoir with the brittleness index over 60%is suitable for the reformation of volume crush.
【Fund】: 国家重点基础研究发展计划“973”项目(2014CB239003)
【CateGory Index】: P618.13
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