黄陇煤田低阶煤层气高渗富集区优选预测及开发建议

Optimizing Prediction and Exploitation Proposals of Low Ranked Coal CBM High Permeability Enriched Area in Huanglong Coalfield

黄陇煤田具有丰富的低阶煤层气资源,具有良好的煤层气资源开发前景。为了提高研究区煤层气开发效果和推动区域上整体开发,基于煤层气含量为主的资源条件和以渗透率为主的开采条件的优势叠合及其与煤厚、埋深、煤质等地质因素相互优势耦合的思路开展高渗富集区的预测研究。建立了以含气量和渗透率为高渗富集区的主控因素,煤层厚度,埋深、地应力,煤体结构、灰分、变质程度6个地质因素作为次级控制因素指标的高渗富集区加权指数预测方法。预测结果与实际煤层气开发效果具有一致性。本次预测的高渗富集I类区主要集中在彬长矿区南部(大佛寺,小庄,亭南,以及下沟煤矿的西部区域)、焦坪矿区南部的下石节以及黄陵矿区北部,面积共计673.7km 2。针对煤层气地质条件较差的Ⅱ类和Ⅲ类区提出了井上井下联动抽采建议。研究成果可为黄陇煤田下一步煤层气开发和瓦斯防治提供地质依据。

Low ranked coal CBM resources are abundant in the Huanglong coalfield with better exploitation prospect.To promote CBM exploitation effect and push forward regionally integrated exploitation in the study area,based on predominances stacked resource mining conditions mainly CBM content and permeability as well as mutual predominances coupled coal thickness,buried depth and coal quality geological factors carried out high permeability enriched area prediction study.A high permeability enriched area weighting index prediction method has been established taking the methane content and permeability as high permeability enriched area main control factors,and coal thickness,buried depth,ground stress,coal mass structure,ash content and degree of metamorphism 6 geological factors as secondary control factors.Predicted result and actual CBM exploitation effect has consistence.This predicted high permeability enriched category I areas are mainly concentrated in the southern Binchang mining area’s Dafosi,Xiaozhuang,Tingnan and Xiagou coalmine western part;southern Jiaoping mining area’s Xiashijie;as well as northern Huangling mining area;total area is 673.7km 2.In allusion to CBM geological condition relatively inferior categories II and III areas have put forward surface and underground joint drainage proposal.The research findings can be geological basis for further CBM exploitation and gas prevention and governance in Huanglong coalfield.