黄庄勘查区二_1煤沉积环境与聚煤规律分析

Analysis of 二_1 coal depositional environment and accumulating rule in Huangzhuang exploration zone

以煤田地质学、沉积地质学的基本地质理论为指导,利用层序地层分析、沉积环境分析、测井曲线等具体分析方法,对黄庄勘查区石炭二叠纪的二_1煤沉积环境和聚煤规律进行了研究。研究表明:二_1煤形成于三角洲边缘潮坪相;在海滨平原环境上发育起来的潮坪沉积形成的二_1煤,具有煤层厚度大,稳定性较好,分布广的特点;二_1煤厚度受到成煤沼泽发育早晚和持续时间长短的潮坪亚相环境差异影响。片流冲刷是引起二_1煤在北部地区厚度变薄的因素。二_1煤层在区内分布情况为:中厚煤层主要集中在东部和南部,北部煤层厚度逐渐变薄;在二_1煤形成后,地质构造作用影响煤层的厚度和分布。

Sedimentary environment and coal accumulating rule of carboniferous Permian 二1 coal in Huangzhuang exploration zone were studied with methods of sequence stratigraphic analysis, depositional environment analysis and logging curves analysis as well as taking coal geology and sedimentary geology theory as guidance. The result showed that 二1 coal formed at edge of delta tidal flat facies;二1 coal which formed in tidal flat deposits that developed in coastal plain environment had characteristics of large coal seam thickness, good stability and wide distribution; the thickness of the coal was affected by difference of tidal flat sub environment between development of coal swamp and duration of formation. Sheet flow erosion was the factor causing thickness of -- 1 coal to be thinned in northern region. And distribution of 二1 coal in the area was： medium thickness coal seam mainly concentrated in eastern and the southern part, thickness of northern coal seam gradually thinned; After formation of 二1 coal, thickness and distribution of coal seam were affected by geological structure function.