一个识别古代风暴作用的新标志——特征异地煤

DISTINCTIVE AILOCHTHONOUS COAL AS THE CRITERIA FOR RECOGNITION OF ANCIENT STORM PROCESSES

一、前言风暴既具有强烈的破坏作用,又赋有极大的建设性。古代风暴作用的产物——风暴岩为油气运移和聚集提供了良好通道与空间。因此风暴岩的研究与识别,对油气勘探与开发具有实际意义。现业已提出了有关识别风暴岩的大量标志。但研究工作表明,并非各处风暴岩均具有特征的识别标志(组合),尤其是那些遭受了其它地质营力改造的风暴沉积更是难以留下风暴作用痕迹。那些特征的识别标志,在大面积野外露头上可能是可行的。

Storm is an important factor controlling modern and ancient littoral and shallow marine deposition. The abnormal storm events bring about the final features of the littoral and shallow marine sediments. In the present paper, the authors have proposed the criteria for recognition of tempestites which, of course, can not be applied to all kinds of the tempestltes here and there, especially to those that have been subjected to reworking by other geological agents. In terms of the analysis of the Carboniferous and Permian sedimentary facies in southern North China area, the shallow marine characteristic thin-bedded coal seams have been identified in the Taiyuan Formation in the study area. The nature, occurrence, development background, organic fossils from the coal seams and their association with storm limestones show that these coal seams may result from the abnormal events, i.e. storm processes. Morever, the geochemical and regional data have also revealed that the distinctive allochthonous coal seams may serve as both the criteria for identification of ancient storm processes and the well-developed source beds.