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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。
The Upper Triassic Xujiahe Formation reservoir in Hebaophu area, Sichuan Basin is characterized by strong heterogeneity and complicated relationship between gas and water, and the high-resolution sequence stratigraphy is divided to predict the main strata and favorable zones for the development of sandstone reservoirs. The exploration and development of natural gas deployment is of great significance. Using outcrops, cores, logging, earthquakes and other data to establish a sequence stratigraphic framework, the Xujiahe Formation in this area is divided into four third-level sequences and eleven fourth-level sequences, each of which has a Can be subdivided into 7 to 10 five-level sequence. The results show that: ①the main gas layer is developed in sq21 (Upper Member of Member 2 of Xujiahe Formation), sq23 (lower member of Member 4 of Xujiahe Formation); ②The gas-accumulating facies belts are underwater distributary channel and estuarine dam; ③ The four or five key sequences of reservoirs are finely portrayed. Based on such factors as energy storage coefficient, sedimentary microfacies, gas test data and the tectonic setting, 14 favorable zones of Class Ⅰ and Ⅱ reservoirs are evaluated band. Class I reservoirs favorable zones include: package 22-package 24-package shallow 4 wells, package 21-package 1- package shallow 001-6 well, package 33-package 16-package 45 well, package 208 Well area, package 27 - package shallow 205 well area, light package 4, package shallow 001-6, package 206 well, package 39 well.