黄河北地区晚古生代岩相古地理与煤系烃源岩发育

黄河北地区广泛发育各种沉积体系,通过对其沉积特征及沉积模式的分析发现黄河北地区晚古生代石炭-二叠纪海相、陆相和过渡相环境均有发育。该地区存在的主要沉积体系类型是潮坪沉积体系、障壁-潟湖沉积体系、河控浅水三角洲沉积体系和河流-湖泊沉积体系。研究发现:本区石炭-二叠系储层烃源岩发育有意义的三个沉积演化阶段分别是本溪期、太原期、山西期;黄河北地区属鲁西地区一部分,晚古生代石炭-二叠系含煤地层主要发育砂岩、泥质岩、碳酸盐岩、岩浆岩和可燃性有机岩(煤),是重要的烃源岩;黄河北煤田含煤地层含煤14层,其中1~5层煤赋存于山西组,6~14层煤赋存于太原组,就可采煤层的层数来说,存在“东多西少”的特点;在含煤地层剖面上的分布特点是“上薄下厚”,主要富煤带则主要分布在东部地区;泥页岩主要发育在石炭-二叠系太原组和山西组,泥页岩层厚度在横向上有一定的规律性,由北向南泥页岩层厚度有逐渐减小的趋势,南部济西矿区和长清矿区,西北部伦镇矿区、李屯矿区厚度发育较好,多在90m以上。

Paleozoic Lithofacies,Paleogeography and Coal Measures Source Rock Development in Huanghebei Region

Various sedimentary systems have been widely developed in the Huanghebei region.Through analysis of sedimentary features,sedimentary modes have found that the late Paleozoic Permo-Carboniferous environmental marine facies,continental facies and transition facies all have been developed.Main sedimentary system types in the region have tidal flat,barrier-lagoon,fluvial dominated shallow water delta and fluvial-lacustrine sedimentary systems.The study has found that three significant Permo-Carboniferous reservoir source rock development sedimental evolutionary stages have Benxi Age,Taiyuan Age and Shanxi Age respectively.Huanghebei region is in western Shandong area,late Paleozoic Permo-Carboniferous coal-bearing strata have mainly developed sandstone,argillaceous rock,carbonate rock,magmatic rock and combustible organic rock(coal)are significant source rocks.The coal-bearing strata in Huanghebei coalfield have 14 coal seams,in which,coal Nos.1 to 5 are hosted in Shanxi Formation,coal Nos.6 to 14 in Taiyuan Formation.In the terms of mineable coal numbers have presented“more in east and less in west”features,while in terms of coal-bearing strata sectional distribution features presented“thinner upper and thicker lower”features.Main coal-rich zone has mainly developed in eastern part.Argillutite has mainly developed in Permo-Carboniferous Taiyuan and Shanxi formations;its thickness has certain regular pattern laterally,from north to south have a gradually reduced trend;the Jixi and Changqing mine areas in south,Lunzhen and Litun mine areas in northwest,argillutite developed better,mostly above 90m.