黄骅坳陷北大港构造带沙河街组碎屑岩储层特征及其控制因素

在沉积相研究的基础上,综合利用岩石铸体薄片、扫描电镜、X-衍射和镜质体反射率等实验室分析技术,对黄骅坳陷北大港构造带沙河街组开展碎屑岩储层的岩石学特征和成岩作用研究,总结次生孔隙的发育分布规律,最终探讨研究区储层储集性能的控制因素.结果表明:研究区储层孔隙类型主要为次生孔隙,纵向上主要发育3个次生孔隙带,有机酸、CO_2和黏土矿物转化是研究区次生孔隙形成的主要原因;沉积相类型、成岩作用、黏土矿物转化以及烃类的早期充注对研究区碎屑岩储集性能具有重要的控制作用.

Clastic reservoir characteristics of Shahejie formation in Beidagang structural belt of Huanghua depression and its controlling factors

Based on the study of sedimentary facies, the lithologic features and diagenesis of the clastic reservoir of Shahejie formation in Beidagang structural belt of Huanghua depression were investigated by means of laboratory analysis techniques such as casting thin sections, scanning electron microscope, X-ray diffraction and vitrinite reflectance. The distribution of secondary pores was summarized and eventually the controlling factors of reservoir property were discussed. The results show that the pore type of study area is mainly secondary pores and three secondary pore zones develop in longitudinal direction. Organic acid, carbon dioxide and clay mineral transformation are the main causes for the formation of secondary pores. The types of sedimentary facies, diagenesis, clay minerals transformation and early hydrocarbon invasion have important controlling effect on reservoir performance of the study area.