油气藏原始烃类孔隙体积的早期预测  

EARLY PREDICATION OF THE INITIAL HYDROCARBON PORE VOLUME IN OIL AND GAS RESERVOIR

作　　者：高有瑞[1] 刘艳[1] 

机构地区：[1]中原石油勘探局勘探开发科学研究院

出　　处：《天然气工业》1998年第6期45-47,共3页Natural Gas Industry

摘　　要：对油气藏所具有的原始烃类孔隙体积一般采用容积法进行计算，在油气藏开发早期各种资料有限的情况下，计算结果精度较低。由于ＰＶＴ等组分膨胀实验模拟了油气藏的开采动态，在压力下降引起地下流体膨胀量等于地面采出量乘以流体体积系数的情况下，实验所取得的相对体积随压力的变化关系能有效地用于烃类孔隙体积的预测。这就提供了一种无须考虑有效厚度、孔隙度和含油（气）饱和度这３个难以确定的参数，而在油气藏的早期评价时便可计算出其原始烃类孔隙体积的可能性。该方法的精确度，取决于实验样品的代表性和实验本身的准确性，以及生产动态资料的可靠性。由于现在油气藏的开发早期都要进行ＰＶＴ测试，为该方法应用提供了条件。应用实例表明该方法简便、可靠。The volumetric method is always adopted for calculating the initial hydrocarbon pore volume in oil and gas reservoir but its calculating accuracy is relatively low under the condition of insufficient data in the early stage of oil and gas reservoir development. Owing to the fact that the production performance of oil and gas reservoir may be simulated by the equal constituent expansion experiment in PVT test ,the experimental relationship of the relative volume vs pressure can be efficiently used for the predication of the hydrocarbon pore volume under the condition that the underground fluid expansion caused by pressure drop is equal to the surface production multiplied by fluid volume factor,which provides a possibility of calculating the initial hydrocarbon pore volume during the early reservoir evaluation without considering the three parameters as the effective pay thickness,porosity and oil (gas) saturation which are difficult to be measured.The precision of the method depends upon the representativeness of the experimental samples,the accuracy of the experiments and the reliability of the production performance data.At present,the PVT test wants to be carried out in the early stage of oil and gas reservoir development,which provids the condition for applying the method,Through applying in practice it is shown that this method is simple,convenient and reliable.

关 键 词：油气藏 含油饱和度 烃 孔隙体积 开发 

分 类 号：TE34[石油与天然气工程—油气田开发工程]