论文部分内容阅读
为了研究陆相断陷盆地煤层与油页岩共生发育的地质现象,采用沉积学、构造地质学、能源地质学和层序地层学的相关理论和方法对煤与油页岩共生发育特征进行了研究.研究发现:陆相断陷盆地煤层与油页岩主要存在5种共生组合类型;煤和油页岩的发育均需要稳定的构造和较少的陆源碎屑物质供应,共生发育的煤和油页岩中均含有高等植物和藻类;盆地基底的幕式构造活动对煤和油页岩发育的沉积环境及其转化起到主要控制作用,气候条件、陆源碎屑物质注入、有机质供应等起到次要控制作用;在层序地层格架下,各种煤与油页岩共生组合均可发育在湖扩张体系域,从体系域早期到晚期、从滨湖到湖中心,共生组合中煤层厚度逐渐减小,油页岩厚度逐渐增大;而早期高水位体系域,则主要发育厚度大、分布稳定的油页岩-煤层组合.可见,盆地基底幕式构造活动、沉积环境演化、气候条件、陆源碎屑物质注入、有机质供应等因素共同控制了陆相断陷盆地煤与油页岩的共生发育,且共生组合主要发育在湖扩张体系域和早期高水位体系域.
In order to study the geological phenomenon of symbiotic development of coal seam and oil shale in continental rifted basin, the symbiotic development characteristics of coal and oil shale were studied by using the theories and methods of sedimentology, tectonics, energy geology and sequence stratigraphy It is found that there are mainly five kinds of symbiotic assemblages between the coal seams and oil shale in the continental rift basin. The development of coal and oil shale requires stable structure and less supply of terrigenous clastic material, symbiotic coal and Oil shale contains higher plants and algae; the basal tectonic activity of the basin plays a major controlling role in the depositional environment and its transformation of coal and oil shale development, climatic conditions, the intrusion of terrigenous clastic matter and the supply of organic matter To secondary control. Under the framework of sequence stratigraphy, all kinds of coal and oil shale symbiotic assemblages can develop in the lake expansion system tract. From early to late system tract, from lake to lake center, The thickness gradually decreases and the thickness of oil shale increases gradually. However, in the early highstand system tract, the thick and stable oil shale-coal seam assemblages are mainly developed.It can be seen that basal curtain tectonic activity, sedimentation Throughout evolution, climatic conditions, terrigenous clastic material is injected, the supply of organic matter and other factors control the symbiotic development in Continental Rift Basin coal and oil shale, and the symbiotic combination of lake extension system tract and early HST mainly developed in.