基于层次分析法的致密砂岩储层可压性综合评价  

Comprehensive Evaluation of Fracability of Tight Sandstone Reservoirs Based on Analytic Hierarchy Process

作　　者：张冲[1,2] 夏富国 夏玉琴 周小林 ZHANG Chong;XIA Fuguo;XIA Yuqing;ZHOU Xiaolin(Petroleum Engineering Environmental Technology Research Institute,SINOPEC Northeast Oil&Gas Branch,Changchun,Jilin 130062,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Development Division of PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610021,China;Second Gas Recovery Plant,PetroChina Changqing Oilfield Company,Yulin,Shaanxi 719000,China)

机构地区：[1]中国石油化工股份有限公司东北油气分公司石油工程环保技术研究院,130062 [2]油气藏地质及开发工程国家重点实验室·西南石油大学 [3]中石油西南油气田分公司开发事业部 [4]中石油长庆油田分公司第二采气厂

出　　处：《钻采工艺》2021年第1期61-64,共4页Drilling & Production Technology

基　　金：中石化科技部项目“重点地区致密储层特征与改造技术研究”(编号:P15118)。

摘　　要：可压性是评价页岩储层体积压裂可行性的重要指标。致密砂岩储层与页岩储层具有相似性,可借助可压性评价指标判断致密砂岩储层体积压裂的难易程度。但通过现有可压性评价指标判断致密砂岩储层改造存在评价效果不理想的问题,评价储层可压性的参数众多,常规单因素评价结果经常出现部分参数满足体积压裂要求,而另一些参数却不满足,难以完成最终的可压性评价。对此提出采用模糊数学中的层次分析法,充分考虑岩石力学脆性、矿物脆性、天然裂缝、水平主应力差异、断裂韧性以及隔层遮挡效应等多个因素,构造等价矩阵确定各因素权重,利用参数标准化后形成的可压指数,对致密砂岩储层体积压裂可压性进行综合评价。与传统评价方法相比,层次分析法更有利于指导选井选层,综合地质工程双甜点因素,评价其含气潜力和易改造潜力,对致密砂岩储层压裂优化设计和施工具有参考价值。Fracability is an important index to evaluate the feasibility of volume fracturing in shale reservoirs.Tight sandstone reservoirs are similar to shale reservoirs,and the fracability evaluation index is used to determine the difficulty of volume fracturing of tight sandstone reservoirs.However,there is a problem that the evaluation effect is not ideal for the evaluation of tight sandstone reservoir stimulation based on the existing evaluation indexes.There are many parameters for the evaluation of reservoir fracability.Conventional single-factor evaluation results often show that some parameters meet the requirements of volume fracturing,while other parameters do not,so it is difficult to complete the final evaluation of the fracability.In this paper,the analytic hierarchy process of fuzzy mathematics is used.Many factors such as rock mechanics brittleness,mineral brittleness,natural fracture,horizontal principal stress difference,fracture toughness and barrier shielding effect are fully considered.Equivalent matrix is constructed to determine the weight of each factor,and the fracability index formed after parameter standardization is used to comprehensively evaluate the fracability of volume fracturing in tight sandstone reservoirs.Compared with the traditional evaluation method,the analytic hierarchy process is more conducive to guide the selection of wells and layers,and evaluate the gas bearing potential and easy stimulation potential by integrating the geological and engineering factors,which has reference value for the optimal design and operation of tight sandstone reservoir fracturing.

关 键 词：致密砂岩 体积压裂 可压性 层次分析法 

分 类 号：TE377[石油与天然气工程—油气田开发工程]