库车坳陷白垩系砂岩储层石英溶蚀非均质性特征及其主控因素  

Heterogeneous Features of Quartz Grain Dissolution of Cretaceous Sandstone Reservoir in the Kuqa Depression and Its Major Controlling factors

作　　者：韩登林[1,2] 李忠[3] 李维锋[1,2] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北荆州434023 [2]长江大学地球科学学院,湖北荆州434023 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质学报》2011年第2期256-261,共6页Acta Geologica Sinica

基　　金：长江大学科研发展基金;国家重点基础研究发展规划(编号2006CB202304)联合资助成果

摘　　要：库车坳陷白垩系巴什基奇克组砂岩储层内石英颗粒溶蚀作用较发育,溶蚀主要发育在颗粒内部或颗粒边缘。储层内石英颗粒的溶蚀效应呈现出明显的平面非均质性特征,溶蚀增孔量高值区的储层内不仅在胶结物上富集方沸石胶结物,在粘土矿物组合上也表现出富伊利石贫高岭石的特征。通过层间泥岩硼元素含量的测定,对研究层段同沉积地层水体盐度进行恢复,其平面分布规律与石英颗粒溶蚀效应的非均质性特征基本一致,表明同沉积水体的盐度是储层内石英溶蚀非均质性特征的主控因素。Taking the Cretaceous Bashijiqike Formation in the Kuqa depression as an example,this study suggests that the dissolution of quartz grain in sandstone reservoirs is extensive,with dissolution occurring mainly in the interior and around the rim of quartz grains.Reservoir in the areas with high value of quartz dissolution pore is not only enriched in analcime cement but characterized with rich illite and poor kaolinite also.Salinity of syndepositional formation water in the studied section was reconstructed using the mensuration of content of Boron in mudstone interbedded sandstone.The result shows that the planar distribution law of water salinity is in agreement to heterogeneous nature of dissolution of quartz grains,indicating that the salinity of syndepositional formation water is the dominating factor of heterogeneous dissolution of quartz grains.

关 键 词：库车坳陷 成岩作用 石英 溶蚀作用 同沉积地层水 

分 类 号：P618.13[天文地球—矿床学]