江汉盆地盐间非砂岩储层测井响应特征与识别

Well Logging Response Features and Identification of Non-sandstone Reservoirs in Jianghan Basin

江汉盆地盐间非砂岩岩性、储集空间均十分复杂,纵横向变化大,具有特殊的沉积和成岩模式,这给测井解释与评价带来了极大的困难。近年来在岩心分析资料基础上,常规测井与成像测井技术相结合,逐步形成了一套以成像测井技术为主的储层识别与评价方法,其中常规测井解释主要依靠双侧向电阻率的低值幅差、声波时差的增大、密度的减小、中子孔隙度的增大、井径的增大等特征进行储层识别,成像测井方面如核磁测井T2谱模式识别储集层孔隙结构特征和流体性质、声电成像测井的条纹显示进行储层裂缝和可动流体的识别等。

Inter-salt non-sandstone lithology and reservoir space were very complicated,it was changed greatly in vertical direction and it had special modes of deposition and diagenesis,which induced great difficulties in log interpretation and evaluation. In recent years,based on core analysis and in combination of conventional logging and imaging techniques,a set of methods for image-based reservoir identification and evaluation were created gradually,of which the interpretation of conventional logging was used for reservoir identification based on the difference of low amplitude of dual laterolog permeability,the increase of interval transit time,the decrease of density,the increase of neutron population and the increase of well diameters. Imaging logging such as T2 mode of nuclear magnetic logging is used for identifying the characters of pore structure and fluid property and the stripe display of acoustic logging for the purposes of identification of reservoir fractures and movable fluids.