江汉盆地新沟嘴组碳酸盐岩油藏特征及开发技术  

The Characteristics and Development Technology of Carbonate Reservoirs in Xingouzui Formation of Jianghan Basin

作　　者：张建荣[1] 苏苇[1] 陈立欣[1] 李维[1] 

机构地区：[1]中石化江汉油田分公司江汉采油厂,湖北潜江433123

出　　处：《石油天然气学报》2013年第10期116-120,8,共5页Journal of Oil and Gas Technology

摘　　要：江汉盆地东部古近系新沟嘴组(Ex)碳酸盐岩储层位于新沟嘴组下段(ExL)Ⅱ油组,岩性主要为泥晶白云岩,夹杂大量泥岩、细粉砂岩及脆性矿物,孔隙以白云石晶间孔、黏土晶间孔为主,属中孔特低渗储层。研究表明,油藏为近源运移聚集、源储共生的准连续式成藏,具有储层大面积分布、油气呈准连续分布、圈闭介于有形与无形之间、油水分异差、油水同出的特点,同时又具有典型连续型油藏源内成藏、自生自储的特点,是"非常规"致密油油藏。根据Ex碳酸盐岩油藏特征,进行了开发方式选择,初步制定了相应的开发技术策略,在实践中探索了大位移定向井钻井、水平井分段大型压裂、储层大型酸化改造等技术的应用,取得了实质性进展。同时,鉴于油藏开发投资成本高的现状,开展了提高机械钻速降周期、减少技术套管降成本、压裂段数与产量拟合确定最佳压裂段数控制成本等措施,改进了开发效果,有效促进了江汉盆地特殊类型油藏的勘探开发,对江汉油田重新上产起到了重要的作用。The carbonate reservoir was located in the lower member of Eogene Xingouzui Formation(ExL)in east of Jianghan Basin.The lithology was mainly composed of micritic dolomites,it also includeed mudstones,fine siltstones and brittle minerals,the main pore included intercrystal pore in dolomite and intergranular pore in clay,it belonged to a middle porosity and extra-low permeability reservoir.Research shows that the reservoir is formed by near source migration and common genesis of source and reserves of quasi-continuous accumulation.It has the characteristics of wide distribution of reservoirs,oil and gas in quasi-continuous distribution,traps between the visible and invisible shapes,difference existed between oil and water and co-production of oil and water.But the reservoir also has the typical characteristics of continuous reservoir formation in sources,which is an authigenic reservoir.It belongs to an'unconventional'tight reservoir.According to the characteristics of carbonate reservoir in Xingouzui Formation,the development modes are chosen,then preliminary oil and gas development technologic policy is determined,the application of technologies such as drilling of directional wells with large displacement,horizontal well automatic separation and fracturing,reservoir acidification and reconstruction etc are used and obvious progress is made in production.At the same time,in consideration of the high cost of reservoir development,measures are taken,which include enhancing the cycle of penetration reduction, reducing the cost of technical casings,matching of fracturing section number,determining its number and controlling operation cost,by which the effect of development is improved and the development of special reservoir is effectively improved in Jianghan Basin,it plays an important role for reproduction in Jianghan Oilfield.

关 键 词：江汉盆地 新沟嘴组 碳酸盐岩油藏 泥晶白云岩 源储共生准连续聚集 大位移定向井 

分 类 号：TE323[石油与天然气工程—油气田开发工程]