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东辛北带古地貌形态具有“三扇两沟”特征,沙四段发育大套近岸水下扇和滑塌浊积扇砂砾岩体。沉积相带对砂砾岩体储集物性具有重要的控制作用:扇中亚相物性最好,发育中孔中低渗储层;扇缘亚相、滑塌浊积砂砾岩次之,为中孔低渗储层;扇根亚相物性最差,属于低孔低-特低渗储层。近岸水下扇砂砾岩体成藏条件较好,油气藏产量较高;滑塌浊积砂砾岩体由于物性较差,故油气藏含油气充满度较低,含水较高。
The ancient geomorphology of the East Xinbei belt has the feature of “three ditches and two ditches”, and a large set of nearshore subaqueous fans and slump turbidite fan conglomerates are developed in the fourth member of Shahejie Formation. Sedimentary facies belt plays an important role in controlling the reservoir physical properties of glutenite body: the sub-facies in the fan is the best, middle and low permeability reservoirs are developed; the fan margin subfacies and slump turbidite conglomerate are secondarily mesoporous Low-permeability reservoirs; fan-shaped sub-phase material properties of the worst, belonging to low-porosity low-permeability reservoir. The nearshore subaqueous fan conglomerate body has better reservoir forming conditions and higher oil and gas reservoir yield. Due to poor physical properties, the slump-turbidite conglomerate body has low filling degree and high water content.