塔里木盆地白垩系巴什基奇克组陆相砂岩中碳酸盐岩碎屑特征及其地质意义

从储层的微观特征入手，通过各种实验分析认为:塔里木盆地库车坳陷—塔北隆起白垩系巴什基奇克组砂岩中的碳酸盐岩碎屑有五大特征，明显区别于胶结物:粒度粗，一般比其周围的原生孔隙大，磨圆好（个别有晚期压溶现象），轮廓清晰；在砂岩中分布相对均匀，非斑块状；碎屑中存在古生物的化石且多为粉细晶；胶结物（铁方解石、铁白云石）多附着在碎屑边缘呈加大边出现，染色有明显变化；灰岩、云岩碎屑在阴极射线下发桔黄色光。碳酸盐岩碎屑的分布具有近源粒度粗、含量低、分选差、磨圆差、均质差；远源粒度细、含量高、分选好、磨圆好、均质好；浅埋粒形好、深埋压溶强的特征。物源区发育的古老碳酸盐岩地层，干旱、炎热、近咸化的古气候、古水体环境，近源快速堆积的古地理环境是碳酸盐岩碎屑的主要成因。碳酸盐岩碎屑的识别和量化具有重要的地质意义:其减孔效应明显低于胶结物，可有效解释高含量碳酸盐高物性砂岩成因，其分布是界定沉积物源区的有效证据。

Carbonate Debris Characteristics and Its Geological Significance in the Terrestrial Sandstone of Cretaceous Bashijiqike Group,Tarim Basin

Microscopic characteristics of the reservoir from the start,through a variety of experiments that:Cretaceous Bashijiqike sandstone carbonate debris of Kuqa Depression-Tabei uplift in Tarim Basin have five major characteristics of clear distinction with cement:Coarse grain size,generally around than the original porosity,and a good grinding round(individual phenomenon of the late pressure solution),the clear outline and a relatively homogeneous distribution in the sand,non-block classes;debris in the presenc...