石油实验地质Issue(5)：566-574,9.DOI:10.11781/sysydz201505566
渤海湾盆地东营凹陷古近系泥页岩孔隙特征及孔隙度演化规律
Pore characteristics and their evolution in Paleogene mud shales, Dongying Sag, Bohai Bay Basin
摘要
Abstract
The pore characteristics of mud shales from the lower part of the third member and the upper part of the fourth member of the Paleogene Shahejie Formation in the Dongying Sag were studied through modern experi⁃mental methods. The relationships between pore size distribution, porosity and burial depth were analyzed. Five major pore types of the Paleogene mud shales in the study area were identified, including intercrystalline pores in clay minerals, intercrystalline pores in calcites, intergranular pores in sands, intercrystalline pores in pyrites, and organic pores. Nano pores were well developed in the mud shales, and the pores smaller than 25 nm accoun⁃ted for 49.7%to 86.3%of total pores. The changing modes of porosity with depth are discussed. An model of how the pores in the mud shales evolved in the Paleogene in the Donging Sag was established from their characteristics and knowledge of their controlling factors. There were three evolution stages for pores in the Paleogene mud shales, including the original formation stage, the transformation stage and the hysteresis stage, among which the second and the third contributed more to the hydrocarbon storage capacity of the shales. Greater thickness, high organic abundance, rich pyrite and active thermal sulfate reduction effect were favorable conditions for reservoir development in mud shales.关键词
泥页岩/孔隙特征/页岩气/成岩作用/东营凹陷/渤海湾盆地Key words
mud shale/pore characteristics/shale gas/diagenesis/Dongying Sag/Bohai Bay Basin分类
能源科技引用本文复制引用
李钜源..渤海湾盆地东营凹陷古近系泥页岩孔隙特征及孔隙度演化规律[J].石油实验地质,2015,(5):566-574,9.基金项目
国家自然科学基金项目“湖相页岩油可动性基本地质条件研究”（41372129）、国家重点基础研究发展计划（973计划）项目“陆相页岩油资源潜力与分布规律”（2014CB239105）和中国石化科技攻关项目“东营凹陷页岩油气富集条件与有利区预测”（P11066）资助。 （）
