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陆表海盆地海侵事件成煤作用机制分析
引用本文:李增学,余继峰,郭建斌,韩美莲.陆表海盆地海侵事件成煤作用机制分析[J].沉积学报,2003,21(2):288-296,306.
作者姓名:李增学  余继峰  郭建斌  韩美莲
作者单位:山东科技大学 山东泰安 271019
基金项目: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。

关 键 词:海侵事件    事件聚煤作用    陆表海盆地
文章编号:1000-0550(2003)02-0288-10
收稿时间:2002-04-01

Analysis on Coal Formation under Transgression Events and Its Mechanism in Epicontinental Sea Basin
LI Zeng-xue YU Ji-feng GUO Jian-bin,HAN Mei-lian.Analysis on Coal Formation under Transgression Events and Its Mechanism in Epicontinental Sea Basin[J].Acta Sedimentologica Sinica,2003,21(2):288-296,306.
Authors:LI Zeng-xue YU Ji-feng GUO Jian-bin  HAN Mei-lian
Institution:Shandong University of Science & Technology, Tai'an,Shandong 271019
Abstract: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 transgression events in epicontinental sea coal aggregational basin. It is believed that the transgression events controlled the aggregation of coal in epicontinental sea basin, the rising of the base level provided favorable condition for the growth of peat swamp, while the large scale of transgression later on stopped the peat accumulation, which put the peat in a deoxidizing environment for a relatively short time for being preserved to form coal, and makes it impossible for very thick coal seams to be formed in such short period of peat swamp. That is to say, coal seams formed in such basin environment are mostly thin coal seams. The essential difference of coal formation with transgression events from that with transgression process is the isochronism. The latter is lacking in isochronism. There is no such continuous sedimentary series between sea facies layers and coal seams in the transgression event coal-forming model as in ordinary transgression process. The bottom floor of the coal seam is root clay, and there is interruption of sedimentation, which can be used as an important interface in dividing high-resolution sequences and the inside units. In the transgression event coal formation model has been proposed in the paper, the authors mainly emphasize the accidental event property. The transgression event played a controlling role in the aggregation of coal in the epicontinental sea basin. Peat accumulation results from the evolution of the environment caused by the rising of base level ahead of transgression. The peat accumulation can be said to take place during the period of sea level oscillation. If the accommodation needed for peat accumulation ion is stable for a long period, thick coal seam could be formed. The fact is that large scales of transgression enlarge the accommodation abruptly, which was not suitable for coal accumulation. Peat was submerged in deep water and coalification took place in a complete deoxidizing condition, also the gelatification was fairly complete. The happening proce
Keywords:transgression events    aggregation of eoal under "event"    epicontinental sea basin
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