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研究气层在欠平衡和超平衡测井条件下响应特征的差异,对于欠平衡条件下天然气储层的评价和测井资料的应用具有指导意义.利用Monte Carlo数值模拟技术,计算得到了在欠平衡和超平衡测井条件下,补偿中子和密度测井随井眼直径、地层孔隙度和含气饱和度的变化关系.从而得出,在井眼直径较小时,密度和中子测井,在超平衡测井或欠平衡测井条件下,对气层的响应特征基本相同,欠平衡密度测井资料可以正常应用,不需要做校正处理;当井眼直径较大时,井内介质对探测器的影响不同,需要对欠平衡测井资料做井径的影响校正.
It is instructive for the evaluation of natural gas reservoirs and application of well logging data under underbalanced conditions to study the difference of response characteristics of gas reservoirs under underbalanced and overbalanced logging conditions.Using Monte Carlo numerical simulation technology, Under balanced and overbalanced logging conditions, the relationship between compensated neutron and density logging with wellbore diameter, formation porosity and gas saturation is concluded that density and neutron logging Under overbalanced or underbalanced logging conditions, the response characteristics to the gas layer are basically the same. The data of underbalanced density logging can be applied normally without correction. When the borehole diameter is large, The influence of the detectors is different, and the effect correction of the borehole diameter needs to be corrected.