川西三叠纪须家河组致密砂岩储层地层水电阻率的确定

DETERMINATION OF THE FORMATION WATER RESISTIVITY OF DENSE SANDSTONE RESERVOIR IN XU JIA HE FORMATIOM OF TRIASSIC SYSTEM, WEST SI-CHUAN PROVINCE

西南石油地质局测井队

致密砂岩储层,具有低孔、低渗透、非均质和裂缝控油(气)的特征。常规测井解释方法和传统公式不适应这种特殊储层。地层水电阻率是评价油(气)的极为重要的中间参数。它可以使测井解释得出相反的结果。由经过校正的传统方程所得到的地层水电阻率R_w值与化验分析资料及其他方法所求结果对比,在本区可以获得较为满意的结果。

Dense sandstone reservoir has the characters of low porosity, low permeability, non-homogeneous and the oil/gas fissure controllation. The conventional formulae and technique for well-log interpretation are no longer suited for such special reservoirs. The resistivity of the formation water is a very important intermediate parameter for oil/gas evaluation. Different resistivities may lead to different results. The resistivity Ru of formation water obtained from the modified conventional equation is conform with those obtained from the laboratory measurement and other reliable means.