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海侵事件性成煤作用特点与机制分析

发表时间:2009-05-15  浏览量:1295  下载量:616
全部作者: 李增学,韩美莲,刘莹,吕大炜
作者单位: 山东科技大学地质科学与工程学院;山东省油气勘探开发工程技术研究中心
摘 要: 为了查明鄂尔多斯盆地成煤作用机制,特别是事件性的成煤作用特点,运用煤地质学、高分辨率层序地层学以及事件沉积学的理论与方法,对含煤沉积中煤层与其顶底板的沉积序列特点、海侵沉积与煤层之间的成因关系,以及含煤沉积中的事件性界面发育特点进行了分析。研究表明:陆表海盆地充填沉积序列中有两种较为典型的相组合,一是相与相间发育沉积间断面,为不连续沉积相组合,但在时间序列上是连续的,即自下而上依次为暴露沉积、潮坪沼泽及泥炭沼泽、浅海沉积;第二种序列是连续相序,盆地的环境演化是渐变的,潮坪沼泽化逐渐泥炭沼泽化是一个连续过程。因此得出如下结论:暴露沉积代表了一种剥蚀或沉积间断,而沼泽与海侵沉积之间存在海侵过程沉积相序缺失,两者之间存在饥饿沉积或无沉积面,实际上缺少海水向岸扩展的海岸退积序列,这种序列反映了陆表海盆地沉积环境演化上的突发性。
关 键 词: 矿产普查与勘探;事件成煤作用;暴露沉积;海侵沉积序列
Title: The characteristics of marine transgression event and mechanism of coal formation
Author: LI Zengxue, HAN Meilian, LIU Ying, LV Dawei
Organization: College of Geological Science & Engineering, Shandong University of Science and Technology;Research Center of Petroleum and Gas Exploration and Exploitation Techniques of Shandong
Abstract: In order to find out the mechanism of the coal formation, especially the characteristics of the coal formation in events, this paper analyzes the characteristics of the depositional sequence of the coal bed and its top and under layers, the causality between the transgressive deposition and the coal bed, and the developing characteristics of the event interfaces in the coal bearing deposition using the theory and means of the coal-geology, the high-resolution sequence stratigraphy and the event sedimentology. Studies showed that there were two typical combinations of the facies in the filling sedimentary sequence of the epicontinental basin, wherein one was the depositional diastem developed between the facies, which was a discontinuous combination of the depositional facies with continuous time sequence, namely the exposed sediments, the tidal flat swamp and the peat swamp, and the shallow marine sediments appeared from bottom to top; and the other was the continuous sequence with gradually evolved sedimentary environment, in which it was a continuous process that the tidal flat swamp turned gradually into the peat swamp. So the conclusion was drown that the exposed sediments represented a kind of denudation or depositional break, however the sedimentary sequences of marine transgression were missing between the swamp and the transgressive sediments. There was a famine deposit or non-deposit surface between them. In fact, the regressive sequence resulted from the expansion of the sea water toward the land was missing. This kind of sequence indicated the mutation of sedimentary environment of the epicontinental sea basin.
Key words: general survey and exploration of minerals; coal formation in events; exposed sediments; transgressive depositional sequence
发表期数: 2009年5月第9期
引用格式: 李增学,韩美莲,刘莹,等. 海侵事件性成煤作用特点与机制分析[J]. 中国科技论文在线精品论文,2009,2(9):995-999.
 
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