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常规方法解释裂缝具有分辨率较低、多解性较强、直观性较差等缺陷，而成像测井的应用目前较为有限。在基岩电阻率较高的硬地层中，在去除了泥质、孔隙、高矿化度地层水和其他矿物等影响因素后，地层电阻率与致密围岩电阻率的差异就被认为是裂缝因素引起的。将常规测井资料与成像测井、岩心、录井、试油等资料相结合，在对电阻率进行各种附加导电校正的基础上，利用双侧向电阻的差异计算裂缝张开度，根据筒化的双侧向解释公式计算裂缝孔隙度，根据裂缝宽度与裂缝渗透率实验关系求解裂缝渗透率。采用这套方法对某地区奥陶系碳酸盐岩储层计算裂缝参数，与取心井段岩心裂缝孔隙度、成像测井资料、地层动态渗透率及试油(气)结果吻合较好，说明该套估算裂缝参数的方法是可行且有效的。

Methods of Estimating Fracture Parameters by Logging

Interpreting fractures by conventional logging methods is of some shortcomings,such as low resolution,multiple solution and poor objectivity and the application of imaging logging is relatively limited at present.In hard strata with high matrix resistivities,it was considered that the difference between formation resistivity and tight surrounding rock resistivity was caused by fractures except these factors as shaliness,pores,high salinity formation water and the other minerals.By combining the conventional log data with the data on imaging logging,core,drilling-log and production test,etc.,and on the basis of carrying out various additional conduction corrections for resistivites,the fracture opening may be calculated by use of the difference between the resistivities of dual laterallog;the fracture porosity can be estimated according to a simplified dual laterolog interpretation formula;and the fracture permeability may be acquired in light of the experimental relation between the fracture widths and the fracture permeabilities.The fracture parameters calculated for the Ordovician carbonate reservoirs in one region by applying these methods are well identical with the core fracture porosity,imaging logging data,formation dynamic permeability and production test result,which indicates that these methods of estimating fracture parameters are feasible and effective.