非烃类气层测井识别方法

Identification of Non hydrocarbon Gas Zone

刘中奇，杜春玲．非烃类气层测井识别方法．测井技术，１９９８，２２（２）：１０７～１１０叙述了声波时差测井、密度测井和中子孔隙度测井在气层不同于油水层的显示特征。分析了非烃类气（二氧化碳气）气层和烃类气（甲烷气）气层的声波时差测井响应、密度测井响应和中子孔隙度测井响应。提出了几种常用而又比较有效的非烃类气（二氧化碳气）气层识别方法：声波－密度孔隙度差值法、孔隙度比值重叠法、声波－密度孔隙度比值法、孔隙度差比值法、气饱和度法。

Sonic, density and neutron logging responses to gas zone differ from those to oil or water zone. Differences are analyzed between those responses to non hydrocarbon (CO_2) gas zone and hydrocarbon (methane) gas zone. Several available methods for identifying non hydrocarbon gas zones effectively are given, such as sonic density differential porosity method, overlap of porosity ratio, sonic density porosity ratio method, differential porosity ratio method, and gas saturation method.