中文摘要：

通过测试砂岩密度与孔隙度间的线性相关性，寻求计算鄂尔多斯盆地富县地区三叠系延长组砂岩孔隙度以及划分其类型的有效途径。统计、对比不同种类测井数据发现，声波时差、密度、中子孔隙度等均与岩石密度有关；当孔隙度大于10％时，声波时差与孔隙度呈相对陡倾角度的线性相关，而当孔隙度小于5％时却呈指数关系。孔隙度与声波时差曲线间相关性的建立使测井识别有效储层变得简单而直接，基于多井统计、分析建立的砂岩声波时差与其孔隙度的关系模式真实有效。

英文摘要：

Through the linear correlativity test between the rock density and porosity, the effective way is sought to calculate the sandstone porosities and classify their types for Formation Yanehang in Triassic system of Fuxian area in Ordos Basin. The statistics and contrast among the different kinds of well logging data show that the interval tran- sit time, density logging and neutron porosity logging all relate with the rock density; when porosity exceeds 10%, there is linear coherency with steep angle between the interval transit time and porosity; while when the porosity is less than 5%, the exponential correlation is shown. The establishment of the above correlativity makes the identifi- cation of the effective reservoirs by loggings more simple and direct and furthermore the relation model built on the basis of the multiple well statistics and analyses becomes more true and effective.