临兴致密砂岩气藏地质特征及开发潜力分析  

Geological Characteristics and Development Potential Analysis of Linxing Tight Sandstone Gas Reservoir

作　　者：米洪刚 张兵[1] 朱光辉 苏羽[1] 张海锋 Mi Honggang;Zhang Bing;Zhu Guanghui;Su Yu;Zhang Haifeng(China United Coalbed Methane Co.,Ltd.,Beijing 100016)

机构地区：[1]中联煤层气有限责任公司,北京100016

出　　处：《特种油气藏》2022年第6期65-72,共8页Special Oil & Gas Reservoirs

基　　金：“十四五”重大科技专项“陆上非常规天然气勘探开发关键技术”(KKGG-2021-1000)。

摘　　要：针对鄂尔多斯盆地临兴地区致密砂岩气藏非均质性强、储量动用不充分的技术难题,以临兴地区石盒子组盒四段为研究对象,利用钻井、测井与地震资料相结合的方法,进行立体空间层序地层格架精细刻画,并在此基础上开展石盒子组小层级别沉积微相精细描述和致密砂岩“甜点”优质储层定性与定量预测。研究结果表明:临兴地区致密砂岩优质储层主要为孔隙度大于6%、密度小于2.55 g/cm^(3)、v_(P)/v_(S)小于1.8的厚层致密砂岩河道砂体,其地震反射特征为中低频连续中强反射;根据优质储层“甜点”预测结果,部署空间立体井位,临兴地区致密气藏储量动用程度提高15.3个百分点,优化井位部署50口,预计增加天然气可采储量100×10^(8)m^(3)。研究成果可为临兴地区致密气藏未动用储量立体勘探开发部署提供有利的技术支撑,对同类型致密砂岩气藏的勘探及储量有效动用具有重要的参考和借鉴意义。To address the technical problems of strong heterogeneity and insufficient reserves production in the Linxing Area of the Ordos Basin,the fourth member of the Shihezi Formation in the Linxing Area is taken as the research object,a method combining drilling,logging and seismic data is adopted to carry out fine characterization of three-dimensional spatial sequence stratigraphic framework,and on this basis,the fine description of sublayer sedimentary microfacies of Shihezi Formation and the qualitative and quantitative prediction of tight sandstone“sweet spot”high-quality reservoirs are carried out.The research result shows:The high-quality tight sandstone reservoirs in the Linxing Area are mainly thick tight sandstone river channel sand bodies with porosity of greater than 6%,density of less than 2.55 g/cm^(3),and v_(P)/v_(S)of less than 1.8,and their seismic reflection characteristics are medium-low frequency continuous medium-strong reflection;according to the prediction results of high-quality reservoir“sweet spots”,three-dimensional well locations were deployed to increase the reserves production degree of tight gas reservoirs in Linxing Block by 15.3 percentage points,and the locations of 50 wells were optimized,increasing the gas recoverable reserves by 100×10^(8)m^(3).The research results provide favorable technical support for the three-dimensional exploration and development of unproduced reserves of tight gas reservoirs in the Linxing Area,and have important reference significance for the exploration and effective production of reserves of the same type of tight sandstone gas reservoirs.

关 键 词：致密气藏 立体勘探 储量动用 挖潜方向 临兴地区 

分 类 号：TE122[石油与天然气工程—油气勘探]