摘要
压力系数是油气藏评价的基本参数,可以用来评价油气藏的压力状态。但是,在地形起伏较大的地区或高油气柱油气藏,用传统方法计算的压力系数会出现较大偏差。研究了压力系数计算出现偏差的原因,对于地形起伏较大的地区,主要是静水压力的计算出了偏差,把计算起始深度由地面改为潜水面,即可消除计算偏差。对于高油气柱油气藏,选取油气柱中部深度计算压力系数,即可消除计算偏差。油气藏压力—深度关系曲线的截距值,即油气藏流体流到地面的剩余压力,定义为油气藏流体的自喷系数,自喷系数越大,油气藏流体的自喷能力就越强。
Pressure factor is a basic parameter for petroleum reservoir evaluation, which can be used to analyze the pressure status of reser-voirs. However, in an area or reservoir with uneven surface and/or high hydrocarbon column, the calculation of pressure factor may lead toresult with large deviations. This paper studies the reasons for the phenomena above. For the area with uneven surface, it is the calculationof hydrostatic pressure that leads to the deviations, which can be eliminated by replacing the depth from surface with depth from water lev-el. For the reservoir with high hydrocarbon column, it is the mischoice of calculation datum depth of pressure factor that results in deviatedpressure factors, which can be eliminated by using the middle depth rather than the top or bottom depth of hydrocarbon column. The inter-cept pressure of hydrostatic pressure-depth curve, a surplus pressure of reservoir fluids flowing from underground to surface, is defined asspontaneous production factor of reservoir fluids. The larger the spontaneous production factor, the stronger the ability of reservoir fluids toflow spontaneously.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2016年第2期246-248,共3页
Xinjiang Petroleum Geology
关键词
油气藏
地层压力
静水压力
压力系数
异常高压
自喷系数
reservoir
formation pressure
hydrostatic pressure
pressure factor
abnormal high pressure
spontaneous production factor
