CAJ | 학술논문

珠江口盆地的低阻油层具有高泥质含量、低电阻率以及低产能的特点，其真实含油饱和度的确定存在很大的困难。首先分析了区域低阻油层的地质成因，指出地层束缚水含量高，以及由此形成的发达的导电网络是导致油层低阻的主要原因；在此基础上，利用多种适合于泥质砂岩地层的饱和度模型进行计算，并根据密闭取心资料，重点分析了在不同地层条件下，对岩样含油、水饱和度进行脱气校正、压实校正、体积系数校正以及漏失校正的方法；并结合核磁共振测井，对测井计算的含水饱和度进行标定。结果显示，低阻油层的含水饱和度平均在70%以上，且印度尼西亚公式计算的含水饱和度与岩心校正后的饱和度以及核磁束缚水饱和度吻合均很好，因此印度尼西亚公式是最适合本区域低阻油层的饱和度评价模型。
주강구분지적저조유층구유고니질함량、저전조솔이급저산능적특점，기진실함유포화도적학정존재흔대적곤난。수선분석료구역저조유층적지질성인，지출지층속박수함량고，이급유차형성적발체적도전망락시도치유층저조적주요원인；재차기출상，이용다충괄합우니질사암지층적포화도모형진행계산，병근거밀폐취심자료，중점분석료재불동지층조건하，대암양함유、수포화도진행탈기교정、압실교정、체적계수교정이급루실교정적방법；병결합핵자공진측정，대측정계산적함수포화도진행표정。결과현시，저조유층적함수포화도평균재70%이상，차인도니서아공식계산적함수포화도여암심교정후적포화도이급핵자속박수포화도문합균흔호，인차인도니서아공식시최괄합본구역저조유층적포화도평개모형。
The low resistivity reservoir in Pearl River Estuary basin has the characteristic of high shale content,low resistivity,as well as low capacity.It is so difficult to calculate the ture saturation of low resistivity reservoir.Firstly,the authors analyze the geologic origin of low resistivity formation, and give the main reason is the developed conductive network to high bound water content.Using several saturation models which is suit for argillaceous sandstone to calculate the saturation,and the sealing core drilling data,we show the methods of Leakage correction,degassing correction,compaction correction,volumetric factor correction at different formation conditions.And then we calibrate the logging interpretation saturation with NMR logging data.The results show that the water saturation of the low resistivity reservoir is above 70% in average,and saturation form Indonesia formula fits well to the core saturation which has been corrected and the NMR bound water saturation,so the Indonesia formula is the best saturation model for the low resistivity reservoir in this region.