Abstract: This is a study of fractured carbonate oil and gas reservoirs, based on data from actual practice and on a geological model with both a fracture so iution cavity system and a porous matrix, with particular emphasis on the different effect of the two systems on fluid flow and the resultant heteroge neity of the influx of filtrates into the pay. A more practical resistivity equation is thus derived as well as the method of finding out the porosity exponent of fractures M₂. Methods of calculating porosity and saturation of the fracture-solution cavity systems under varying saturation conditions are also discussed and are found to be useful in understanding the capability and permeability of the reservoirs, predicting oil and gas well performance and determining the gas-water surface of the reservoirs. They have been applied in some wells for demonstration and analytical purposes.

摘要： 目前用以处理碳酸盐岩油气层测井资料的数学模型是以均匀孔隙概念为基础。这种概念认为岩石孔隙的几何形状和分布都较均一,它们饱和流体的性质及对流体的渗滤作用也相同。当地层被钻井打开后,泥浆滤液均匀地浸入渗透性地层。从而在地层径向上造成冲洗带、浸入区、原状地层等不同部位的电性差异。用岩性、孔隙度测井系列,可以求得地层孔隙度和渗透率。用不同探测深度的电阻率测井系列,通过阿尔奇公式可以求得地层含水饱和度和冲洗带含水饱和度,并由此而算出残余油、可动油等参数。