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煤具有Ⅲ型干酪根性质,煤以有机质集中而不同于其他干酪根。煤化作用过程中,煤物质不仅形成固态的属于不同煤级的煤,而且也形成由煤物质分解出来的气态产物。固态的煤及其气态产物是一种孪生关系,它们是同源同步演化的产物,具有不可分割的联系。煤系地层不仅形成和含有煤层,而且也形成大量的煤成气,这些煤成气往往能够聚集成各种规模的煤型天然气气藏。含煤—气建造是一种形成并含有煤层和煤成气的连续沉积的沉积组合体。该组合体既赋存有煤藏,也可能贼存有煤成气气藏;既可以相当于某一含煤地层,也可以包括连续沉积于其上的具有密切联系的一些其他地层。按照气源岩和储集层之间的关系,煤型天然气气藏可以划分为自储型气藏和他储型气藏两大类。前者煤和煤成气同源同储于同一个煤系中,后者煤和煤成气同源而异居。煤田地质的研究工作和勘查工作,均应重视自储型气藏这一新的课题。
Coal has Type III kerogen properties and coal concentrates in organic matter and is different from other kerogen. In the process of coalification, the coal material not only forms a solid coal belonging to different coal grades, but also forms a gaseous product that is decomposed by the coal material. Solid coal and its gaseous products are a kind of twins, which are the products of homologous and synchronous evolution with an inextricable link. Coal-bed strata not only form and contain coal seams, but also form a large amount of coal-based gas. These coal-gas formations tend to accumulate into various types of coal-type natural gas reservoirs. Coal-to-gas construction is a deposit of sediments that form and contain continuous deposits of coal and coal gas. The assemblage contains both coal and gas reservoirs; it may be equivalent to a coal-bearing formation or it may include some closely related strata continuously deposited thereon. According to the relationship between gas source rocks and reservoirs, coal natural gas reservoirs can be divided into two types: self-storage gas reservoirs and other reservoirs. The former coal and coal gas are homogeneously stored in the same coal system, which is homologous and co-resident with coal-to-gas. Coal geological research and exploration work, should pay attention to self-storage gas reservoir this new topic.