涠洲A油田流沙港组一段Ⅱ油组沉积微相及优质储层预测

Sedimentary Microfacies and High Quality Reservoirs Prediction of the 2nd Oil Series in the 1st Member of Liushagang Formation in Weizhou A Oilfield

通过岩性、粒度、沉积构造和测井相分析,结合区域地质认识对涠洲A油田流沙港组一段Ⅱ油组的沉积微相进行研究,认为研究区为扇三角洲沉积,主要发育扇三角洲前缘辫状水道、辫流坝、河口坝、席状砂和水道间沉积微相,通过"点-线-面"的研究思路得到其沉积微相平面展布。同时还探讨了其沉积模式和演化规律。通过"叠合法"将L_1Ⅱ油组砂岩厚度图、沉积微相图、物性分布图三者进行叠合,进而得到其优质储层展布范围,为油田后续储层地质建模、开发方案的制定、调整和优化提供依据。

Through the lithologic analysis,grain size analysis,sedimentary structure and logfacies analysis,combined with regional geological background and previous research results,it determines that the region mainly develops the fan delta sedimentary system of Liushagang Ⅱformation in Weizhou A oilfield.The main microfacies includes braided channel,braided flow bar,channel mouth bar,sand sheet,bay beside distributary channel of fan delta front.the plane distribution of sedimentary microfacies is obtained through the research approach ＂point-linesurface＂.At the same time,the sedimentary model and evolution law are also discussed.The high quality reservoirs distribution was obtained through the sandstone thickness,sedimentary microfacies and physical distribution map of L1Ⅱ oil group overlapping,which provided the theoretical basis for the formulation and adjustment of the reservoir geological modeling and development plan.