中文摘要：

双湖地区是羌塘盆地最具油气资源潜力的地区之一,然而目前对于该区域侏罗系岩石物性参数特征的研究相对缺乏.本文系统采集了该地区侏罗系岩石物性样品,开展了自然伽马能谱、电阻率、极化率和磁化率等分析,总结了各地层物性参数特征,并根据其统计结果建立了侏罗纪地层物性综合柱状图,为下一步非震地球物理石油勘探提供了基础资料.结果表明,研究区侏罗纪地层碎屑岩层具有高放射性、磁化率及极化率与低电阻率的特征,而碳酸盐岩层具有高电阻率和低放射性、磁化率及极化率的特征.侏罗系各地层的物性参数存在明显差异,自下而上存在3个密度界面,分别是下侏罗统曲色组与中侏罗统色哇组之间、中侏罗统色哇组与莎巧木组之间以及中侏罗统布曲组与夏里组之间.其中,电阻率总体表现出＂下低、上高＂,而极化率和自然伽马能谱数值总体呈现＂下高、上低＂的特征,从地层磁性方面来看,中侏罗统布曲组与上侏罗统索瓦组地层一般呈弱磁或无磁性,而下侏罗统曲色组、中侏罗统色哇组、莎巧木组和夏里组地层磁性较高.此外,下侏罗统曲色组与中侏罗统色哇组呈低阻、低密度的特征,具备开展大地电磁测深和重力测量勘探的物性前提条件;中侏罗统布曲组呈低放射性、低极化率、低磁化率和高电阻率的特征,具备开展重、磁异常和放射性勘探的物性条件.

英文摘要：

The Shuanghu region of Qiangtang Basin is one of the best area of hydrocarbon potential,however,it＇s lack of research and an analytical methods of the physical parameters of Jurassic formation.The petrophysical rock samples of Jurassic strata in Shuanghu region were scientifically collected to analyze and summarize their features of petrophysical parameters by natural gamma ray spectrometry,resistivity,polarizability and magnetic susceptibility which to provide the non-seismic geophysical measurements with basic data,also,the petrophysical parameters of main Jurassic strata were arranged statistically.The results showed that the sandstone in the study area were in the characteristics of high radioactive,magnetization,susceptibility and low resistivity,and the limestone and dolomite with high resistivity,low radiation,magnetic susceptibility and polarization.There are obvious differences of the physical parameters between the Jurassic strata,which consist in the interfaces from bottom to top,first,between the Early Jurassic Quse formation and the Middle Jurassic Sewa formation,second,between the Middle Jurassic Sewa formation and Sha Qiaomu formation,third,between the Middle Jurassic Buqu Formation and Xiali formation.The results also showed that the resistivity of the strata was low in the lower part an high in the upper.The polarizability and natural gamma ray was high in the lower part an low in the upper.In general,the middle Jurassic Buqu Formation and upper Jurassic Suowa formation have weak magnetic or nonmagnetic.The lower Jurassic Quse formation,Middle Jurassic Sewa formation,shaqiaomu formation and Xiali formation have high magnetic.In addition,the Early Jurassic Quse formation and the middle Jurassic Sewa formation have the characteristic of low resistance,low density which may have the prerequisite for magnetotelluric and gravity exploration;the middle Jurassic Buqu formation have the characteristic of low polarization,low magnetic susceptibility and high resistivity have the prerequisite for magneti