一种页岩储层脆性评价方法

Evaluation method for shale reservoir brittleness

 肖佳林¹ 李远照¹ 候振坤¹ 郭印同² 王磊²

中国石化江汉油田分公司石油工程技术研究院，湖北 武汉 430035 重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400044）

Research Institute of Petroleum Engineering, Jianghan Oilfield Company, SINOPEC, Wuhan 430035, China State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

 页岩的脆性对于岩石起裂以及压裂复杂裂缝的形成具有重要影响，亦是综合评价储层可压性的关键指标。基于岩石全过程应力￣应变曲线，综合室内岩心测试和测井解释数据建立了多元回归函数，建立了新型脆性指数计算方法，实现了储层多因素影响下脆性的定量表征和综合评价，并对涪陵焦石坝区块部分页岩气井储层脆性进行了分析研究。现场应用表明，与传统脆性评价方法相比，该方法计算结果在局部层段反映更为精细、更全面，同时与储层地质力学条件、现场施工情况具有较好的关联性。

 The brittleness index of shale plays an important role in the process of crack in rock and complex fracture in hydraulic fracturing, which is also a key indicator to evaluate the reservoir characteristics. Based on the whole strain-stress curves， a new brittle index was established through both the state parameter and the process evolution. The quantitative characterization and comprehensive evaluation for the brittleness were studied by the influence of multi-factors for the reservoir. Multiple regression function was established from the indoor core experimental data and logging interpretation data and the analysis were obtained for some gas wells in Jiaoshiba blocks, Fuling. Comparing with the traditional evaluation method for brittleness index, the calculation results of this method in the local section are more precise and more comprehensive, which show good relevance with reservoir geological mechanics condition and field operations.

10.6056/dkyqt201704011