库车坳陷克拉苏构造带白垩系储层孔喉组合类型定量表征与展布
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摘要
原位定量分析与统计储层孔隙的毫米—微米—纳米级孔径、喉径等参数,是现阶段深层储层储集空间评价及预测的重要方法与内容。结合铸体薄片分析技术,对14口井40余块储层样品开展了QEMSCAN扫描电镜矿物原位定量评价分析、聚焦电子-离子双束扫描电镜(FIB-SEM)分析以及SEM图像大面积扫描与合成分析,发现库车坳陷克拉苏构造带博孜、大北和克深等井区白垩系巴什基奇克组储层的粒间孔隙内有大量的岩盐与盐泥胶结物,岩盐多呈晶粒状集合体分布于颗粒之间。储集层发育碱性成岩环境下的岩盐—白云石—硬石膏胶结物组合和方解石—岩盐胶结物组合。储层微观孔喉组合在平面上具有"分段分带"的特征,并划分出5种类型。统计表明,孔隙直径十分关键,可能对气层、差气层或干层的性质有较重要影响,而隙和喉道的影响相对孔径要弱。这种分析技术的应用可初步实现储层微观孔喉特征的原位定量测定,为深层储集空间精细表征与天然气增产提供一定地质基础。
In-situ and quantitative analysis of reservoir pore throat from millimeter size to micro/nano size is significant for the deep reservoir evaluation and prediction at present.More than40 samples from14 wells are analyzed by using casting thin section,QEMSCAN evaluation,FIB-SEM scan and SEM-image synthesis.It is found that there are many halite and NaCl mud cements in intergranular pores of Cretaceous Bashijiqike Formation in Dabei,Keshen and Bozi well blocks of the Kelasu tectonic belt,Kuqa depression.The halites exist in the form of granular aggregates.There are two types of cement assemblages including halite-dolomite-anhydrite and calcite-halite in the reservoir,developed under alkaline environment.Based on the data from millimeter to micro/nano size,five pore throat assemblages characterized by zonation and segmentation could be divided for the Lower Cretaceous Bashijiqike Formation in Kuqa depression.The pore diameter data are quite critical but the throat data are subordinate to the attributes of the gas reservoir,bad gas reservoir or dry layer.The techniques can be applied to determinate the in-situ micro pore throat,finely characterize the reservoirs for the natural gas stimulation.
In-situ and quantitative analysis of reservoir pore throat from millimeter size to micro/nano size is significant for the deep reservoir evaluation and prediction at present.More than40 samples from14 wells are analyzed by using casting thin section,QEMSCAN evaluation,FIB-SEM scan and SEM-image synthesis.It is found that there are many halite and NaCl mud cements in intergranular pores of Cretaceous Bashijiqike Formation in Dabei,Keshen and Bozi well blocks of the Kelasu tectonic belt,Kuqa depression.The halites exist in the form of granular aggregates.There are two types of cement assemblages including halite-dolomite-anhydrite and calcite-halite in the reservoir,developed under alkaline environment.Based on the data from millimeter to micro/nano size,five pore throat assemblages characterized by zonation and segmentation could be divided for the Lower Cretaceous Bashijiqike Formation in Kuqa depression.The pore diameter data are quite critical but the throat data are subordinate to the attributes of the gas reservoir,bad gas reservoir or dry layer.The techniques can be applied to determinate the in-situ micro pore throat,finely characterize the reservoirs for the natural gas stimulation.
引文
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