青藏高原北部东昆仑地区三叠系八宝山组页岩储层测井评价

Logging evaluation of Triassic Babaoshan Formation shale reservoir in East Kunlun area of northern Qinghai-Tibet Plateau

通过结合电阻率、声波时差、补偿中子、自然伽马测井等常规测井评价方法,用大量岩心样品作为校正依据,使用测井曲线重叠法、测井参数图版交会法、多元线性回归法等建立了青藏高原北部东昆仑地区三叠系八宝山组储层岩性、物性、有机碳含量等关键参数的定性识别方法和定量解释模型,并结合实测有机碳含量(TOC)、镜质体反射率(R_(O))和补偿中子(CNL)之间的相关性建立储层含气量解释模型。通过测井模型拟合计算结果显示:青藏高原北部东昆仑地区三叠系八宝山组页岩储层孔隙度分布在0.5%~2.6%之间,渗透率分布在(0.002~2.3)×10^(-3)μm^(2)之间;有机碳含量分布在0.2%~7%之间,镜质体反射率分布在2.3%~3.12%之间,平均含气量为3.7 m^(3)/t。储层整体表现为特低孔特低渗的物性特征,具有良好的生烃潜力和含气性及较高的资源潜力。

Based on conventional logging evaluation methods,such as resistivity logging,acoustic logging,compensated neutron and natural gamma ray logging,and using a large number of core samples as correction basis,the qualitative identification method and quantitative interpretation model of key parameters such as lithology,physical properties and organic carbon content of the Triassic Dabaoshan Formation reservoir in the East Kunlun area of the northern Qinghai-Tibet Plateau were established by using log curve overlap method,log parameter plate intersection method and multiple linear regression method.Combined with the correlation between the measured organic carbon content(TOC),vitrinite reflectance(R_(O))and compensated neutron(CNL),an interpretation model of reservoir gas content is established.The fitting calculation results show that the porosity of the Triassic Babaoshan Formation shale reservoir in East Kunlun area in the north of Qinghai-Tibet Plateau is0.5%-2.6%,and the permeability is(0.002-2.3)×10^(-3)μm^(2).The distribution of organic carbon content was 0.2%-7%,the vitrinite reflectivity was 2.3%-3.12%,and the average gas content was 3.7 m^(3)/t.The reservoir as a whole is characterized by extremely low porosity and extremely low permeability.It has good hydrocarbon generation potential,gas bearing potential and high resource evaluation potential.