Kumkol-North油田主力油层三角洲前缘砂体内部结构解剖

Kumkol-north油田上侏罗统库姆科尔组主力小层三角洲前缘砂体中,未水淹和弱水淹层厚度所占比重较大,水驱动用程度小于45%。前人研究认为三角洲前缘砂体内复杂的建筑结构导致了这种现象。研究发现该地区属于典型的浅水三角洲砂体,沉积构造背景稳定,发育了一套与传统深水型三角洲特征差异明显的浅水型三角洲沉积储层。用"垂向分层、平面分带"的传统解剖思路,难于合理解释生产中。以Kumkol-north油田J22小层为研究对象,在充分认识砂体沉积特点的基础上,结合针对浅水三角洲砂体内部结构进行的沉积模拟实验提出的新的叠覆式浅水三角洲沉积模式,以及新的储层内部结构分析方法,对Kumkol-north油田主力小层做了精细的内部结构解剖。重建了以朵体为基本沉积单元的三角洲内部储层结构格架,为进一步提高Kumkol-north油田主力油层的勘探开发奠定了基础。

Main Reservoir Sandbodies Frameworks of Delta Front, kumkol-north oil field

In the delta front sand body which is belong to kumkol formation of The Upper Jurassic of kumkol-north oil field ,the non-waterflooded and weak waterflooded thickness take great part, and the degree of water drive is less than 45% ,previous studies considered that the complex architecture in the delta front sand body results in this phenomenon. The study finds that this area is belong to typical shallow -water delta and the sedimentary structural setting is stable, which develops a set of shallow -water delta sedimentary reservoir and different from the traditional deepwater delta features, it is difficult to explain the production by the traditional research ideas of vertical stratification and planar strips. The study assessed the kumkol-north oil field J22 main layer ,and by knowing fully the sand-body characteristics ,combined the new superimposed shallow water delta model which is put forward for sedimentary simulation experiment of the internal structure of shallow -water delta and a new analytical method of the reservoir internal structure ,It rebuilds the reservoir structure framework regarded single lobe as the basic unit by making a fine inner structural anatomy for kumkol-north oil field main layer, The new structural anatomy lay a foundation for further enhancing the capability of the petroleum exploration and development in kumkol-north oil field .