低渗透储层不同流动单元可动流体赋存特征及生产动态分析——以鄂尔多斯盆地姬塬地区长6段储层为例

利用高压压汞、恒速压汞、核磁共振、铸体薄片、物性等分析测试手段及试油资料,对姬塬地区长6段储层进行了流动单元的划分,同时分析不同流动单元微观孔隙结构特征及其对可动流体饱和度的影响,进而研究其生产动态的差异。结果表明:研究区四类流动单元微观孔隙结构差异明显,是造成其可动流体饱和度差异的主要因素。其中,喉道半径分布形态及主流喉道半径大小起了决定性作用。在油气田开发阶段中,应该根据不同流动单元的微观孔隙结构差异性特征,实施合理有效的开发方案。

Characteristics of movable fluids and study of production performance in different flow units of low-permeability reservoirs: An example from the Chang 6 block of the Jiyuan oilfield in Ordos Basin

The purpose of this work is to divide flow units and analyze their microscopic pore structure and its influence on that saturation degree of these fluids in the Chang 6 reservoir of the Jiyuan area. It uses various data available including high pressure mercury injection, constant mercury injection, nuclear magnetic resonance, casting lamella and petro-physical analysis. Furthermore, the differential production performance is studied. Results show that the study area can be divided into four types with distinct microscopic pore structure characteristics, which can account for the differences of movable fluid saturation. Of them, the distribution pattern of throat radius and the size of main throat radius play a conclusive rule. During the development of the oilfield, reasonable and effective exploitation schemes should be implemented based on the different microscopic pore structure characteristics of each type of the flow units.