CAJ | 학술논문

运用层序地层学有关理论和方法,分析了浑江煤田石炭系-二叠系含煤岩系的层序,探讨了聚煤作用的控制因素.石炭纪-二叠纪含煤地层共识别出4个层序边界,划分为3个三级层序.为分析煤层厚度与地层厚度及砂岩百分含量的关系,绘制了三维相关图.研究表明,层序2地层厚度在40～70 m时,层序3地层厚度在50～80 m时,煤层发育较厚,而此时砂岩百分含量小于50%,表明有利于煤层聚积的环境是沉降速率中等、陆源碎屑供给相对较少的沉积环境,主要是三角洲间湾以及下三角洲平原地区.研究区含煤岩系层序地层格架中,不同层序沉积时期,煤层的分布有所不同,对于层序2来说,主要可采煤层分布在最大海泛带两侧,而层序3主要可采煤层分布在海侵面附近,此时较低的泥炭堆积速率与较慢的可容空间增加速率相平衡,从而形成该煤层.
운용층서지층학유관이론화방법,분석료혼강매전석탄계-이첩계함매암계적층서,탐토료취매작용적공제인소.석탄기-이첩기함매지층공식별출4개층서변계,화분위3개삼급층서.위분석매층후도여지층후도급사암백분함량적관계,회제료삼유상관도.연구표명,층서2지층후도재40～70 m시,층서3지층후도재50～80 m시,매층발육교후,이차시사암백분함량소우50%,표명유리우매층취적적배경시침강속솔중등、륙원쇄설공급상대교소적침적배경,주요시삼각주간만이급하삼각주평원지구.연구구함매암계층서지층격가중,불동층서침적시기,매층적분포유소불동,대우층서2래설,주요가채매층분포재최대해범대량측,이층서3주요가채매층분포재해침면부근,차시교저적니탄퇴적속솔여교만적가용공간증가속솔상평형,종이형성해매층.
The principle of sequence stratigraphy has been used to reconstruct the sequence stratigraphic framework of the Carboniferous-Permian coal measures in Hunjiang coal field. The controls of sequence stratigraphy on the coal accumulation in this coal field have been discussed. Four sequence boundaries, which divided these Carboniferous-Permian coal measures into three the third-order sequences, have been identified. A three-dimensional correlogram was drawn to analysis relations among the thickness of coal, the thickness of strata and the content of sandstones. The results show that the thickest coal seams occur in the areas with strata thicknesses of 40-70m for Sequence II and of 50-80m for sequence III, and the content of sandstones is less than 50%, implying that coal-forming environments are those with moderate rates of subsidence and little input of coarse-grained sediments, mainly interdelta bays and lower delta plains. The distributions of coal in the sequence stratigraphic frameworks of this study area are different during different sedimentary periods: during sequence II, the thick coal seams were developed at the both sides of the maximum flood belt, where the moderate accommodation increasing rate and the peat accumulation rate were about equal; during sequence III, the coal seams were developed near the transgression surface, where the low accommodation increasing rate and the peat accumulation rate were about equal.