文章摘要
白悦悦,刘招君,孙平昌,柳蓉,徐银波,张超.中国东北地区梅河盆地梅河组含煤地层层序格架、沉积体系及其聚煤规律[J].矿产勘查,2020,11(6):1166-1182
中国东北地区梅河盆地梅河组含煤地层层序格架、沉积体系及其聚煤规律
Sedimentary system and coal accumulation regularity in the coal-bearing sequence stratigraphic framework in the Meihe Formation of Meihe Basin, NE China
投稿时间:2020-01-13  
DOI:
中文关键词: 煤层  层序地层  扇三角洲  沼泽  梅河盆地  中国东北地区
英文关键词: coal bed, sequence stratigraphy, fan delta, swamp, Meihe Basin, NE China
基金项目:中国地质调查局中国地质科学院地质调查资助项目(编号:DD20189607)和中国博士后科学基金资助项目(编号:2018M631540)联合资助。
作者单位
白悦悦 中国地质科学院地球深部探测中心,北京 100037 
刘招君 吉林大学地球科学学院,长春 130061
吉林省油页岩及共生能源矿产重点实验室,长春 130061 
孙平昌 吉林大学地球科学学院,长春 130061
吉林省油页岩及共生能源矿产重点实验室,长春 130061 
柳蓉 吉林大学地球科学学院,长春 130061
吉林省油页岩及共生能源矿产重点实验室,长春 130061 
徐银波 中国地质调查局油气资源调查中心,北京 100029 
张超 吉林大学地球科学学院,长春 130061
吉林省油页岩及共生能源矿产重点实验室,长春 130061 
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中文摘要:
      梅河盆地位于敦化—密山断裂带内,为中国东北地区古近系重要的断陷聚煤盆地,含煤层位主要为古近系梅河组下含煤段和上含煤段。通过野外踏勘、岩心和显微镜观察,识别出梅河盆地下含煤段和上含煤段主要发育扇三角洲相和湖泊相,并进一步识别出扇三角洲平原、扇三角洲前缘、浅湖及湖沼亚相,其中煤层主要聚集于扇三角洲平原以及湖沼环境中。在野外露头剖面、测井曲线、岩心特征及地球化学特征分析的基础上,对梅河组层序地层研究表明,梅河组下含煤段至上含煤段共发育3个三级层序,其中下含煤段发育在层序I中,上含煤段则在层序III中,每个三级层序均发育低水位体系域(LST)、水进体系域(TST)和高水位体系域(HST)。通过对研究区134口钻孔层序内沉积相统计分析,发现不同体系域中沉积相和煤层分布特征不同,湖沼聚煤环境主要发育在层序I中TST和HST中,而扇三角洲平原聚煤环境主要发育于层序I中LST和层序III中,在TST和HST中湖沼环境沉积的煤层厚度大、连续稳定,为梅河盆地经济可采煤层,在层序I的 LST中和层序III中扇三角洲平原沉积的煤多数薄且不连续,不具备经济可采价值。
英文摘要:
      The Meihe Basin is one of the important Paleogene coal-bearing fault basins of northeastern China in the Dunhua-Mishan Fault Zone. The Lower Coal-bearing Member and the Upper Coal-bearing Member are the primary layers studied. Through field observation, core description and observation under microscope, fan delta facies and lake facies are observed as the main sedimentary facies of the coal-bearing layers, and subfacies of fan delta plain, fan delta front, shallow lake and swamp have also been recognized. Coal seams primarily accumulated in the subfacies of swamp and fan delta plain. The study on sequence stratigraphy is based on outcrop section, well-log analysis, core observation and geochemical analysis. From the Lower Coal-bearing Member to the Upper Coal-bearing Member, three third-order sequences have been recognized; the Lower Coal-bearing Member developed in Sequence I and the Upper Coal-bearing Member developed in Sequence III, both sequences have developed the lowstand systems tract (LST), the transgressive systems tract (TST) and the highstand systems tract (HST). Single-factor analysis and the multifactor comprehensive mapping method have been used to rebuild the lithofacies palaeogeography of each system tract in Sequence I and Sequence III. Through analysis of contour maps of total stratum thickness, sandstone thickness and sand content, as well as contour maps of thicknesses and numbers of layers of coal seams, the results indicate that the sedimentary environments and coal seam distributions are variable in different system tracts. Coal types accumulating in the swamp facies are primarily developed in the transgressive systems tract (TST) and the highstand systems tract (HST) of Sequence I with a wide range of continuous and large thicknesses and may be mined commercially. Both the balanced accommodation growth rate with peat accumulation rate and little or no influence from sediment supply and channel migration promote to form the stable coal accumulating environments.
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