油气地质与采收率2017，Vol.24Issue(5)：10-16,26,8.
基于矿物组分和成岩作用的致密砂岩储层脆性评价方法——以鄂尔多斯盆地东北部某区块为例
A new brittleness evaluation method for tight sandstone reservoir based on mineral compositions and diagenesis :A case study of a certain block in the northeastern Ordos Basin
摘要
Abstract
The evaluation of brittleness of tight sandstone gas reservoir is of great significance in guiding fracturing construction.In view of the problems that the brittle minerals could not be determined in the evaluation of the brittleness and ignorance of influence of diagenesis on the rock brittleness,first of all,the relationship between the mineral components and the brittle index was systematically analyzed according to information of thin sections,core data and the triaxial compressive stress under formation condition based on 26 samples from the block in the northeastern Ordos Basin.The quartz and feldspar are the main brittle minerals in the study area.Secondly,based on two different correlations of brittle index with the main brittle minerals,the influence of diagenesis,pore size and brittle mineral difference on the brittle index was determined.And then the influence of the diagenetic minerals on the pore size and the degree of diagenesis was synthesized to classify tight sandstone reservoirs into two types of Ⅰ reservoir and Ⅱ reservoir by using ratio of quartz and debris to feldspar content.Finally,the brittleness evaluation method for tight sandstone reservoirs based on mineral compositions and diagenesis was proposed and the conesponding brittle index evaluation model was established.The results show that the brittle index evaluation model based on mineral compositions and diagenesis can obtain more accurate brittle index of tight sandstone reservoir,which can provide parameter basis for the identification and stimulation of high-brittle fracturing target layer.关键词
致密砂岩储层/脆性评价/测井曲线/矿物组分/成岩作用Key words
tight sandstone reservoir/brittleness evaluation/logging curves/mineral compositions/diagenesis分类
能源科技引用本文复制引用
周雪晴,张占松,张超谟,张冲,聂昕,朱林奇..基于矿物组分和成岩作用的致密砂岩储层脆性评价方法——以鄂尔多斯盆地东北部某区块为例[J].油气地质与采收率,2017,24(5):10-16,26,8.基金项目
国家自然科学基金项目“致密气储层岩石导电机理研究及饱和度评价”(41404084)及“页岩油储层岩石物理特性数值模拟研究”(41504094),油气资源与勘探技术教育部重点实验室(长江大学)开放基金项目“基于成岩相相控的致密砂岩储层饱和度建模及测井评价”(K2016-09). （41404084）
