平顶山煤田山西组二_1煤层厚度变化因素分析

Analysis of Coal Bed Thickness Change Factor in ShanxiⅡ_1 Coal of Pingdingshan Coalfield

平顶山煤田山西组地层发育在总体海退阶段,以过渡相为主的含煤沉积。通过岩性和旋回研究,将山西组地层分为4段。对沉积环境和聚煤期古构造的研究,总结了山西组二1煤层厚度变化的地质因素是沉积环境及聚煤期基底差异沉降,其次是河流冲刷及后期构造影响的综合因素。

Shanxi formation coal seam of Pingdingshan coalfield develops in a general regressive phase, mainly on transition phase which contains coal settlement. The Shanxi formation is divided into four sections by studying on lithology and gyration. Based on the research of depositional environment and coal gathering ancient structure,it is concluded that the geological factors for Shanxi formation Ⅱ1 Coal thickness changing are sedimentary environment and basal differential settlement, followed by the composite factors contained river erosion and anaphase structural affection.