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双河油田黄草湾区长6油层组沉积期内发育三角洲前缘亚相,储集岩以水下分流河道和河口坝沉积的砂体为主。化验资料表明,该地区储层主要为长石砂岩和岩屑长石砂岩,储集空间主要为次生孔隙和原生粒间孔;储层物性具有低孔、低渗的特点;排驱压力和饱和度中值压力较高,孔喉半径小且分选性较差,溶蚀作用对改善喉道连通性的效果不佳,孔隙结构参数总体较差。结合地区沉积特征分析认为储层物性在水下分流河道砂体中较好,河口砂坝次之。
Triassic delta front developed during the sedimentary period of Chang 6 reservoir in Huangcaowan area, Shuanghe oil field. The reservoir rocks mainly consisted of sand body with underwater distributary channel and estuary dam. Laboratory data show that the main reservoirs in the area are feldspar sandstone and feldspathic feldspathic sandstone. The reservoir space is mainly composed of secondary pores and primary intergranular pores. The reservoir properties are characterized by low porosity and low permeability. The displacement pressure and The median saturation pressure is high, the pore throat radius is small and the sorting is poor. The effect of dissolution on the improvement of throat connectivity is poor, and the pore structure parameters are generally poor. Based on the analysis of sedimentary characteristics in the area, it is concluded that reservoir physical properties are better in underwater distributary channel sand bodies, followed by estuarine sand bars.