摘要
作者采用环境参数、相组合、定性与定量相结合的综合分析方法，将研究区山西组分为４段１９层４２个微相，并归属为泻湘——潮坪及滨海三角洲两大沉积体系．广布的二＿１煤沉积环境就是在总体海退与短暂海侵、泻湖海湾、潮坪及泻湖海湾、沼泽进一步泥炭沼泽化而成；二＿１煤层厚度主要是受聚煤场陷基底差异沉降及沉积环境所控制（约占９０％），并可用两个对数正态子总体分别描述之；其次为河流冲蚀作用及后期构造变动的影响（约占１０％），且具有在隆起区煤厚变薄尖灭、在场陷区煤层增厚连续的基本规律。
By using multipurpose analysis of environmental parameters and facies model,and qualitative and quantitative way, the paper divides Shanxi formation into four scctions, nineteen strata and forty-two microfacics, all belonging to two major depositional systems,i.e.the littor al delta and the lagoon tidal flat depositional systelms. Shanxi formation coal seam Ⅱ_1 is formed in lagoon-gulf and the tidal flat subcnvironments during the overall regression and the tidal flat subenvironments during the overall regression and the short transgrssion. The variation in thickness of coal seam Ⅱ_1 is controlled essentially by the local secdimentary environment and uncven subsidence of coal一accumulating dcpression bascment (about 90 perecnt), whith can be described by two lognormal component populations respectively, secondly is affected by the river erosion and the later tectonics (about 10 percent).coal seam Ⅱ_1 is thinned or pinched out in the uplift area,thickened in the down-warped area.
基金
煤炭科学基金
关键词
沉积环境
聚煤坳陷
控制因素
煤厚
煤系
地层
edimentary environment
vertical facies sequence
coal accumulating depression
,lognormal component population
control factor
