陆相页岩油岩石可压裂性影响因素评价与应用——以沧东凹陷孔二段为例  

Evaluation and application of influencing factors on the fracturability of continental shale oil reservoir: a case study of Kong 2 Member in Cangdong sag

作　　者：周立宏[1] 刘学伟[1] 付大其[1] 李东平[1] 廖兴松[1] 张胜传[1] 柴公权[1] 赵敏[1] 田福春[1] 赵玉东[1] 蒲秀刚[1] 刘建峰[1] 尹顺利 Zhou Lihong;Liu Xuewei;Fu Daqi;Li Dongping;Liao Xingsong;Zhang Shengchuan;Chai Gongquan;Zhao Min;Tian Fuchun;Zhao Yudong;Pu Xiugang;Liu Jianfeng;Yin Shunli(PetroChina Dagang Oilfield Company)

机构地区：[1]中国石油大港油田公司

出　　处：《中国石油勘探》2019年第5期670-678,共9页China Petroleum Exploration

基　　金：国家科技重大专项“大型油气田及煤层气开发”（2016ZX05006-005）;中国石油天然气股份有限公司科技重大专项“大港油区效益增储稳产关键技术研究与应用”（2018E-11），“陆相中高成熟度页岩油勘探开发关键技术研究与应用”（2019E-26）

摘　　要：大港探区沧东凹陷孔二段发育典型的陆相页岩油,国内外以海相页岩油气为对象的脆性指数模型不适用于指导陆相页岩油岩石压裂改造。在系统分析沧东凹陷孔二段页岩油储层地质特征基础上,开展岩心三轴破裂实验,利用分形方法建立了反应岩石变形破坏全过程特征的力学脆性指数模型;基于天然裂缝扩展分析,建立了天然裂缝和地应力影响因子的计算方法,以及综合岩石脆性、天然裂缝和地应力三因素的缝网指数模型,实现了对页岩可压裂性的定量预测。应用该模型建立水平井可压裂性指数剖面,优化水平井簇间距设计、射孔参数及压裂施工参数,优选滑溜水+低伤害压裂液体系、石英砂+陶粒组合支撑剂,形成页岩油水平井体积压裂技术。技术成果应用于GD1701H井、GD1702H井,微地震、稳定电场监测证实形成复杂网络裂缝,取得了显著的增产效果。The Kong 2 Member in the Cangdong sag,the Dagang exploration region,is typical continental shale oil reservoir.It can’t be fractured based on the applicable brittleness index model for marine shale oil reservoir at home and abroad.According to geological analysis and core triaxial test,a brittleness index model describing the whole deformed and damaged process of the rock was established for the shale oil reservoir in the Kong2 Member using the fractal method.Then based on the analysis of how natural fractures propagate,the method for calculating the influencing factors of natural fractures and geostress were defined,and finally a fracture network index model integrating rock brittleness,natural fractures and geostress was built for quantitative prediction of the fracturability of the shale reservoir.The model is used to build the fracturability index profile and optimize the cluster spacing,perforating and fracturing parameters of horizontal wells.And together with optimized slip water+low-damage fracturing fluid,and quartz sand+ceramsite proppants,the volume fracturing technology for shale oil horizontal wells was developed.The technological achievements have been applied in Wells GD1701H and GD1702H.And micro-seismic survey and stable electrical field monitoring have found complex fracture networks,indicating remarkable effect of increasing production.

关 键 词：沧东凹陷 页岩油 缝网指数模型 体积压裂 裂缝监测 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]