渤海D区块沙河街组高温低渗储层压裂液敏感性伤害及对策  

Discussion on fracturing fluid damage to high temperature low permeability reservoirs in Bohai block D

作　　者：周军良 耿红柳 胡勇 汪全林 何逸凡 ZHOU Junliang;GENG Hongliu;HU Yong;WANG Quanlin;HE Yifan(Bohai Oilfield Research Institute,CNO OC China Limited,Tianjin Branch,Tanggu 300452,Tianjin,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津塘沽300452

出　　处：《地质找矿论丛》2018年第4期597-603,共7页Contributions to Geology and Mineral Resources Research

基　　金：中国海洋石油总公司重大科技专项"渤海典型低孔低渗油藏勘探开发关键技术研究与实践"(编号:CNOOCKJ125ZDXM07LTDTJ02);国家重大科技专项"海上油田丛式井网整体加密及综合调整油藏工程技术示范"(编号:2011ZX05057-001)资助

摘　　要：渤海湾盆地渤海D区块沙河街组发育低渗-特低渗透油藏,地层具有异常高温高压特征。通过分析储层填隙物特征和孔隙结构特征,认为渤海D区块沙河街组储层属于中、低孔-低渗型。储层填隙物中易于膨胀及分散运移的伊利石含量较高,储层孔隙空间主要为残余原生孔及溶蚀孔,孔隙和喉道大小为细孔喉级别,孔喉连通性差,非均质性强;通过研究压裂液对储层的敏感性伤害,认为渤海D区块沙河街组储层属中等偏强水敏、弱速敏、中等偏弱碱敏、易水锁伤害。为降低压裂液对储层的敏感伤害、压裂液残留物伤害及与地层环境不配伍造成的储层伤害,渤海D区块高温低渗储层的压裂液须具有耐高温、弱碱性特性,且配方中宜添加防膨剂、稳定剂、缓冲剂和助排剂。In Shahe Street formation of Bohai D block D oil reservoirs with low and very low permeability are developed. The strata are characterized by extremely high temperature and pressure. Analysis of char acteristics of filling material and pore structure shows that the reservoirs belong to medium low porosity reservoir. Content of illite which is easily swollen and dispersed and transported is high. Pore in the reset voir is dominated by residual primary pore and dissolved pore with fine throat. The throat connection is poor and the heterogeneity strong. Study on fracturing fluid damage to sensitivity of reservoir shows that the reservoir belongs to medium and slightly stronger water sensitivity, weak velocity sensitivity, weak and slightly stronger alkali sensitivity and easy water locking damage and damage of the residual fluid and damage of incompatibility of the fracturing fluid and the strata environment. In view of that the fracturing fluid for the reservoir must be weak alkaline and anti high temperature the fracturing fluid formula should include anti swelling agent, stabilizing agent, buffering agent and cleanup additives.

关 键 词：高温低渗储层 储层敏感性 压裂液 沙河街组 渤海湾盆地 

分 类 号：P618.13[天文地球—矿床学] TE348[天文地球—地质学]