大港油田张东地区沙二段砂岩储层沉积特征

大港油田张东地区成藏地质条件有利,储层特征是影响该区油气富集的主控因素之一.本文利用测井、录井、岩心及分析测试资料,结合区域构造背景分析,确定张东地区主力储层沙二段砂岩为滨浅湖砂坝相沉积.张东断层上升盘地区处于砂坝主体部位,砂岩厚度大且储层物性较好,是研究区沙二段最有利储集体,位于下降盘的砂体,处在砂坝外缘区,物性较差,勘探风险较高.

RESEARCH ON RESERVOIR DEPOSITIONAL CHARACTERISTICS OF THE NUMBER 2 SHAHEJIE FORMATION IN ZHANGDONG DISTRICT,DAGANG OILFIELD

The Zhangdong district of Dagang oilfield has the favorable geologic condition of petroleum and nutral gas accumulation,and the reservoir charcteristics was one of the main controlling factors to ptetroleum-gas enrichrnent.This paper syntheticlly used well logging、mud logging、well core and the data from testing,associated the tectonic setting,determined that the main reservoir of Zhangdong district,the number 2 of Shaheiie formaition,was belong to the sedimentary facies of sand-bars of mere-littoral lake.and the upthrown of Zhangdong fault which located in the main block of sand-bars,has the better Physical characteristic and thicker sandstone,howerve,the sandstone of the downthrow of Zhangdong fault which located in the exterior margin of sand-bars did not have so good conditions and the exploration risk is higher.