【摘要】 四川盆地河包场地区上三叠统须家河组储层非均质性强、气水关系复杂,进行高分辨率层序地层划分,预测砂岩储层发育的主力层系与有利区带,对于天然气的勘探开发部署具有重要意义。利用露头、岩心、测井、地震等多种资料,建立层序地层格架,将该区须家河组划分为4个三级层序、11个四级层序,每个四级层序又可细分为7～10个五级层序。研究结果表明:①主力气层发育于sq21(须家河组二段上亚段)、sq23(须家河组四段下亚段);②聚气相带为水下分流河道与河口坝;③对重点四级、五级层序进行了储层精细刻画,综合考虑储能系数、沉积微相、试气资料及所处构造位置等因素,评价出14个Ⅰ类、Ⅱ类储层有利区带。其中Ⅰ类储层有利区带包括:包22—包24—包浅4井区、包21—包1—包浅001-6井区、包33—包16—包45井区、包浅208井区、包27—包浅205井区、包浅4、包浅001-6、包206井区、包39井区。更多还原

【Abstract】 Sandstone reservoirs of the Xujiahe Formation in Hebaochang area,the Sichuan Basin,are strong in heterogeneity and complicated in gas-water contact,so high-resolution sequence stratigraphic division and the prediction of the major horizons and potential plays with well-developed sandstone reservoirs are of great significance to the planning of gas exploration and development in the area.A sequence stratigraphic framework was established through integrated analyses of outcrops,cores,log and seismic data.The Xujiahe Formation was divided into 4 third-order sequences and 11 fourth-order sequences,each of which was subdivided into 7 to 10 fifth-order sequences respectively.The following results were obtained.①The major gas reservoirs occur in the upper interval of the second member of the Xujiahe Formation(sq21)and the lower interval of the fourth member of the Xujiahe Formation(sq23).②Underwater distributary channel and mouth bar are the favorable facies tracts for gas accumulation.③ Reservoirs in the key fourth-order and fifth-order sequences are described in detail,and 14 type-I and type-II potential plays are identified based on a comprehensive appraisement of the storage factors,depositional microfacies,well test data and structural background.更多还原