致密砂岩储层脆性指数计算的一种改进方法  

An Improved Method for Calculating Brittleness Index of Tight Sandstone Reservoir

作　　者：李旻杰 谭成仟 LI Minjie;TAN Chengqian(College of Earth Resource Sciences and Engineering,Xi an Shiyou University,Xi an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065

出　　处：《重庆科技学院学报（自然科学版）》2021年第3期54-57,88,共5页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05056)。

摘　　要：在评价储层脆性的过程中,传统的矿物组分法存在一定局限性。针对马岭地区三叠系延长组第7油层致密砂岩储层中石英和碳酸盐矿物为主要脆性矿物的具体情况,利用灰色关联法计算矿物组分权重,建立了综合考虑矿物组分体积分数和矿物组分权重系数的脆性指数计算模型。以此模型计算,得到长7组脆性指数的平均值为52.49%,与实测值具有较高的一致性;同时,脆性指数大于50%的储层集中在中部地区,这与该地区裂缝的密度分布规律是相匹配的。In the process of evaluating the brittleness of reservoir,the traditional mineral composition method has some limitations.In view of the specific situation that quartz and carbonate minerals are the main brittle minerals in tight sandstone reservoir of the seventh oil layer of Triassic Yanchang Formation in Maling area,the weight of mineral components is calculated by grey correlation method,and the calculation model of brittleness index considering the volume fraction and weight coefficient of mineral components is established.Based on this model,the average brittleness index of Chang 7 group is 52.49%,which is in good agreement with the measured value.At the same time,the reservoirs with brittleness index more than 50%are concentrated in the central area,which is consistent with the distribution law of fracture density in this area.

关 键 词：致密砂岩 脆性指数 矿物组分法 权重 灰色关联法 

分 类 号：TE122[石油与天然气工程—油气勘探]