濮城油田南区沙二上4-7砂体沉积特征及微相模式

Sedimentary characteristics and microfacies model of No.4-7 delta front sand-body,the upper of the 2^(nd) member of Shahejie Formation,southern Pucheng oilfield

利用区域地质、地震、测井及岩心分析资料,对濮城油田南区沙二上4-7砂岩组储层的沉积特征进行了全面研究。结果表明,4-7砂岩组为小型闭塞陆相断陷湖盆三角洲前缘沉积,成分和结构成熟度低,可进一步划分为7种微相类型;建立了三角洲前缘砂体的垂向相序和演化模式,总结了储层的平面微相展布规律,为油气勘探开发指明了方向。

The reservoir sedimentary characteristics of the No.4 - 7 sand sets in the upper of the 2^nd member of the Shahejie Formarion in southern Pucheng oiltleld were fully studied in terms of regional geology, seismic, well log as well as core analysis. The result indicates that the 4 - 7 sand sets belong to a kind of delta front deposition developed in a little occlusive non-marlne faulttrough lake basin. The reservoir is of low compositional and textural maturity, and can be divided into 7 types of micro-facies. Meanwhile, the vertical sequence and the evolution models of the delta front sand-bodies in this area are established. Furthermore, the lateral distributing regularities of the micro-facies are summarized.