应用阵列声波测井资料定量评价碳酸盐岩储层渗透性

Applying the Array Acoustic Logging Data to Evaluate the Permeability of Carbonate Reservoir

碳酸盐岩储层晶间孔、微裂缝发育,非均质性较砂岩储层大,常规孔隙度渗透率建模方法求取的渗透率存在较大误差,渗透率参数的准确求取存在困难。基于声波测井的相关理论及对斯通利波影响因素的分项假设,得到根据储层斯通利波时差、剪切模量及流体信息计算反映储层渗透性的流体移动指数的计算公式,并分层位建立其与储层渗透率的解释模型,实现了对碳酸盐岩储层渗透率参数的定量评价。应用上述方法对实际阵列声波测井资料进行处理解释,解释结果与物性分析资料具有较高的一致性,提高了测井解释评价精度。

There are many intercrystal pores and microfratures in carbonate reservoirs,and the heterogeneity of carbonate reservoirs is greater than the sandstone.Therefore conventional modeling method according to porosity has big error and it is difficult to get the value of permeability.In this paper,based on the related theory of acoustic logging and the partial hypothesis of stoneley wave influence factors,qualitative indicator of fluid mobility which reflects the permeability of carbonate reservoirs can be computed according to the reservoir stoneley wave slowness,shear modulus and fluid information.And the permeability interpretation models of different layers were built,which achieved the quantitative evaluation of carbonate reservoir parameters.The above method was used and the actual array acoustic logging data were processed.The results show a good consistance with physical analysis data,which indicates that the models improve the precision of permeability interpretation.