基准面旋回研究在S稠油油田精细开发中的应用

APPLICATION OF BASE LEVEL CYCLES RESEARCH IN THE FINE EXPLOITATION OF S OILFIELDS

渤海S油田为大型岩性-构造稠油油藏,目前已进入开发中后期的高含水阶段。根据钻井、测井资料,应用高分辨率层序地层学基本原理,对研究区进行了多级次基准面旋回的识别与对比,分析了基准面旋回对沉积特征、储层物性、剩余油分布的控制作用,明确了基准面旋回内不同部位剩余油的富集规律。研究认为:(1)基准面下降晚期、上升早期,砂体面积广,厚度大,储层物性好,剩余储量易于动用且多连片分布;(2)基准面下降早期、上升晚期,砂体面积小,厚度薄,储层物性差,剩余储量不易动用且零星分布;(3)基准面下降中期、上升中期,剩余油储量中等。取得了较好的挖潜效果。

Bohai S oilfield is a large lithologic structural oil reservoir,has been developed in the late high water cut stage. According to the area of drilling and logging data,the principle of high resolution sequence stratigraphy application,the recognition and correlation of multistage base level cycles in the study area,analyzed the datum plane cycle control on sedimentary characteristics, reservoir physical properties, the distribution of the remaining oil,the enrichment regularity of base level cycles in different regions of remaining oil:( 1) base level falling late,early rising,wide area of sand body,large thickness,good reservoir physical property,easy to use and remaining reserves more stable;( 2) base level falling earty,rising late,small size of sand body,thin thickness,poor reservoir property,surplus reserves not mobile and sporadic distribution;( 3)middle base level falling rising,with the medium size of the remaining oil reserves. Study confirmed that the research techniques of high resolution sequence stratigraphy has important significance in tapping the potential of remaining oil in high water cut period.