松辽盆地北部卫星-升平地区扶余油层二油组沉积相研究

The Sedimentary Facies of 2^(nd) Member of Fuyu Reservoir of Weixing-Shengping Area in the Northern Songliao Basin

以精细岩心观察描述为基础,依据沉积构造、岩石类型及测井曲线响应特征等相标志,对松辽盆地北部卫星-升平地区扶余油层二油组(Kf2)沉积相类型及特征进行了分析,在此基础上结合高分辨率层序地层划分,以Ⅴ级层序地层格架为单元,对研究区沉积微相平面展布特征进行了研究。结果表明:区内Kf2发育浅水三角洲相沉积,主要砂体类型为三角洲平原分流河道砂体和三角洲前缘水下分流河道砂体;纵向上沉积水体由深逐渐变浅,在Q3-SSC5时期达到最浅,三角洲前缘亚相消失,全区范围内仅发育三角洲平原亚相,河道砂体规模最大,为储集砂体发育的最佳时期。

Based on meticulous core observation,description,the markers of sedimentary structure,rock types and characteristics of logging curve response,the depositional facies and its characteristics of the 2nd member(Kf2)of Fuyu Reservoir in the study area were analyzed.On this basis,combined with high-resolution sequence stratigraphic division,the planar distribution characteristics of sedimentary microfacies in the studied area were also studied by taking Grade V sequence stratigraphy framework as unit.The results show that the shallow-water delta sedimentary facies are developed in the area,and the types of sand bodies are mainly of delta plain distributary channel and underwater distributary channel of delta front,vertically the sedimentary water gradually becomes shallow from deep water,it was the shallowest in the period of Q3-SSC5,where the delta front is disappeared,the delta plain is developed in the whole area,the channel sand body is max thickness,it is the optimal period of reservoir sand body development.