鄂尔多斯盆地延川南2号煤层煤相分析  

Analysis of Coal Facies of No.2 Coal Seam in Yanchuannan Block of Erdos Basin

作　　者：马伟竣[1] 

机构地区：[1]中石化华东分公司石油勘探开发研究院,江苏210036

出　　处：《中国煤层气》2014年第2期25-29,共5页China Coalbed Methane

基　　金：中国石油化工股份有限公司华东分公司重点项目

摘　　要：鄂尔多斯盆地延川南区块山西组2号煤层为该区主力煤层,但成煤环境、煤相类型不明,垂向演化规律不清,制约了高产富集因素分析和有利区优选。本文通过对延川南区块山西组沉积特征和2号煤层煤岩学和煤化学分析,探讨了煤层的成煤环境、煤质特征、煤相类型及演化规律,为后续煤层气的勘探开发研究奠定了理论基础。研究结果表明:本区2号主力煤层成煤环境为三角洲平原泥炭沼泽;2号煤层煤相可划分为潮湿森林沼泽相、较浅覆水森林沼泽相、较深覆水森林沼泽相;成煤植物以木本为主,其次为草本植物;煤层镜质组含量较高,有利于割理的发育,镜质组中以均质镜质体、基质镜质体为主;垂向上,自下而上成煤泥炭沼泽覆水程度经历了先加深后变浅的过程。The No. 2 coal seam of Shanxi Formation is the main coal seam on the Yanchuannan Block in Erdos Basin, but its coal forming environment, coal facies and vertical evolution is not clear, which re- stricts the enrichment factor analysis and favorable zone optimization. In this paper, the coal forming envi- ronment, features of coal properties, coal facies and evolution regulation of the coal seam are discussed by analyzing the sedimentary characteristics of Shanxi Formation, as well as the coal petrology and the chemical feature, which will lay a solid foundation for CBM exploration and development. It is concluded that the coal forming environment of No. 2 coal seam is the peat bog of delta plain and its coal facies can be divided into the wet, the shallow and the deep water of the forest peat bog. The coal seam with high vitrinite content which mainly is the homocollinite and the desmocollinite is good for cleat growth, and the water depth of the peat bog becomes deeper firstly, then became shallower.

关 键 词：成煤环境 煤质特征 煤相类型 延川南 

分 类 号：P618.11[天文地球—矿床学]