火山岩储层测井裂缝参数估算与评价方法

岩心观测和分析表明松辽盆地徐深气田火山岩储层为裂缝-孔隙型储层，为了合理评价裂缝在连通孔隙、改善储层渗流能力的作用，以及对产能的影响，分析了裂缝的测井响应机理及特征。根据常规测井资料和岩-电实验结果，采用地层因素比值法与FMI成像测井有机结合的方法进行裂缝识别与评价；利用双侧向测井、岩心观测资料、压敏实验分析资料估算裂缝开度、裂缝孔隙度及裂缝渗透率；利用FMI与核磁测井T2分布资料，综合判断裂缝的有效性。应用所编制的裂缝识别与裂缝参数估算程序，对研究区若干井进行了解释，与岩心、试气、FMI资料对比，其解释结果合理，说明该方法适用性较好，对产能预测、合理开发方案的制订具有指导意义。

Identifying and evaluating the fractures by the Formation MicroImager (FMI) log and estimating parameters of fractures: A case study of Xushen gas field

Core observation and analysis showed that volcanic reservoirs in the Xushen gas field, Songliao Basin, belong to fracture porosity reservoirs. Therefore, in order to reasonably evaluate the role of fractures playing in connecting pores and improving reservoir's percolation ability as well as its influence on deliverability, we analyzed log response mechanism of fractures and their characters. In accordance with conventional logging data and core electricity experiment results, fractures were identified and evaluated by formation factor ratio method together with the FMI log organically; fracture aperture, its porosity as well as permeability were estimated by making use of dual lateral logging, core observation data and stress sensitivity experiment data; fracture efficiency was judged comprehensively in combination with the FMI log and the T2 distribution data from nuclear magnetic logging. Several wells in the study area were interpreted and compared with the data of core, gas testing as well as the FMI log by making use of the compiled fracture identification program and fracture parameter estimation program whose interpretation results are reasonable, thus suggesting that this method has better applicability and is of guiding significance in deliverability prediction as well as in the establishment of reasonable development plan.