陆表海盆地海侵事件成煤作用机制分析  

Analysis on Coal Formation under Transgression Events and Its Mechanism in Epicontinental Sea Basin

作　　者：李增学[1] 余继峰[1] 郭建斌[1] 韩美莲[1] 

机构地区：[1]山东科技大学,山东泰安271019

出　　处：《沉积学报》2003年第2期288-296,306,共10页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目 (批准号 :49872 0 5 7)资助

摘　　要：研究了含煤地层中海侵事件沉积序列 ,即海侵沉积与煤层直接接触的组合特点 ,总结了海侵事件和海侵事件成煤特点 ,提出了陆表海聚煤盆地海侵事件成煤作用理论及海侵事件成煤机制。研究表明 ,陆表海盆地充填沉积序列中 ,既有海退成煤作用又有海侵成煤作用发生 ,而且 ,海侵事件为陆表海盆地海平面变化的典型特色 ,海侵的突发性是海侵事件的基本属性 ,其沉积具有等时性。海侵事件导致盆地事件型聚煤作用发生。本文还深入讨论了海侵事件成煤机制及其在含煤地层层序地层界面识别、层序地层单元划分的重要意义和作用。According to traditional coal-forming theory, coal formation was thought to take place in the water (marine) regression period of the transgression and regression cycle, that is, the land facies coal forming model. The author's basic point of view that coal was formed during sea transgression is gradually becoming a theory or model of coal formation, which shows coal formation was transferred gradually to land during the transgression coal forming closely related to transgression. Peat formed in advance was submerged in seawater, as a result, the coal seam formed was of diachronism. This theory and model is originated from the analyzing result of the coal formation in epicontinental sea basin, which is a contribution to coal geology and bring up a new way in the analysis of coal formation. In particular, it puts forward a question on how to evaluate the function of coal seam, in terms of a special sedimentary body in sequence stratigraphy analysis. As the diachronism of coal seams was caused by the transgressive coal formation, whether the top surface or the bottom surface of a coal seam can be taken as an interface of different sequence units remains to be studied in detail. The sea level change of North China epicontinental sea basin in the late paleozoic period is of the feature of high frequency and complexity, that is, the sea level changed with different frequencies and grades and the superposition of them, to cause to form a special unit of sediment body. Long period of sea regression contains many short periods of transgression events; also, there may be relatively short period of regression in the course of transgression. The authors have studied the sedimentary series of transgression events in the coal-bearing strata and the characteristics of transgression sediments coming into contact with coal seams, summed up the points of transgression events and coal formation under the events, studied the mechanism of coal forming with transgression events, and put forward the theory of coal formation with t

关 键 词：陆表海盆地 海侵事件 成煤作用 成煤机制 沉积序列 层序地层 

分 类 号：P618.11[天文地球—矿床学] P512.2[天文地球—地质学]