松辽盆地北部泰康—西超地区萨尔图油层组沉积相特征分析及目标预测

ANALYSIS OF SEDIMENTARY FACIES AND TARGET PREDICTION FOR SHAERTU SANDBODY GROUP IN TAIKANG-XICHAO AREA,NORTH OF SONGLIAO BASIN

大庆油田属于高勘探开发油田,以岩心、钻/测井资料为基础,分析了研究区萨尔图油层组沉积相、亚相、微相的沉积特征,划分出辫状三角洲相、三角洲相、湖相3种沉积相,同时划分出辫状三角洲平原、辫状三角洲前缘、三角洲平原、三角洲前缘、浅湖5种沉积亚相,以及辫状分流河道、泛滥平原、辫状水下分流河道、分流河道、水下分流河道、分流间湾、河口坝、远砂坝、前缘席状砂、砂坝、砂滩、滨浅湖席状砂、滨浅湖泥坪12种沉积微相。根据各单井沉积相、亚相、微相的划分,分析泰康—西超地区萨尔图油层组各砂层组沉积微相的展布特征。在沉积相分析预测的基础上,结合油气地质特征,认为研究区存在两大有利油气区带,一是江21—杜65—来20井斜坡带,二是杜53井区。

Daqing Oilfield is in a high extent of exploration and development, on the basis of core data and well log data, we analyzed three types of sedimentary facies including braid delta facies, delta faci es and lacustrine facies; five types of subfaeies including braid delta plain, braid delta front, delta plain, delta front and sublacustrine, and twelve types of microfacies including braided distributary channel, fluvial plain, braided underwater distributary channel, distributary channel, underwater dis- tributary channel, interdistributary bay, river mouth bar, distal bar, sand of front marginal, sand bar, beach bar, loch sheet sand, and mud flat in the study area. According to the divisions of sedimen- tary facies, subfacies, and microfacies for each well, the distribution characteristics of sedimentary microfacies of each sandbody group in Shaertu reservoir in Taikang-Xichao area was showed, which has a significant sense for further exploration of lithologic reserviors. Combined with the hydrocarbon geological character and prediction of sedimentary facies, it is indicated that there are two oil and gas beneficial areas, one is the slope zone of Jiang21-Du65-Lai20 well, the other is Du53 well block.