准噶尔盆地煤层气勘探开发与地质研究进展  

Advance on exploration-development and geological research of coalbed methane in the Junggar Basin

作　　者：汤达祯[1,2,3] 杨曙光 唐淑玲 陶树[1,2,3] 陈世达 张奥博[1,2,3] 蒲一帆 张泰源[1,2,3] TANG Dazhen;YANG Shuguang;TANG Shuling;TAO Shu;CHEN Shida;ZHANG Aobo;PU Yifan;ZHANG Taiyuan(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development&Utilization,Beijing 100083,China;Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China;Xinjiang Coal Geological Bureau,Urumqi 830091,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]煤层气开发利用国家工程中心煤储层实验室,北京100083 [3]非常规天然气地质评价与开发工程北京市重点实验室,北京100083 [4]新疆维吾尔自治区煤田地质局,新疆乌鲁木齐830091

出　　处：《煤炭学报》2021年第8期2412-2425,共14页Journal of China Coal Society

基　　金：国家科技重大专项资助项目(2016ZX05043-001);中央高校基本科研基金资助项目(35932019007)。

摘　　要：准噶尔盆地煤层气资源极为丰富,已开展近30个煤层气勘查项目,施工煤层气井270余口,建成白杨河、四工河、乌鲁木齐河东煤层气开发先导试验区,正在着力推进煤层气规模化开发利用,多个区块呈现出煤层气单井高产势头,针对多、厚、大倾角煤层顺煤层钻井、储层改造、优化排采技术不断推广应用,带动了新疆煤层气产业起步发展。系统总结准噶尔盆地煤层气成藏特殊地质条件,科学分析前期煤层气勘探开发的现状与趋势,全面梳理煤层气勘探开发所面临的地质难题,以期为新疆地区乃至中国中低煤阶煤层气的高效开发提供借鉴。盆地周缘构造隆升、水力逸散、煤层气风氧化带深延是制约煤层气资源分布和勘探开发潜力的不可忽略的地质因素,盆地腹地包括煤层气在内的深部煤系气资源潜力巨大,开展煤系油气地质综合研究、拓展煤系气勘探开发领域势在必行。盆地边缘多个区块煤层气富含CO_(2)且呈现随煤层埋深增大CO_(2)体积分数增高的异常现象,拟以水动力场和水化学场耦合作用为主线,气体差异构成与禀赋为线索,鉴别多源多阶气体来源、混合度及成藏贡献,揭示CO_(2)异常富集成因,探索流体场主导作用下的煤层气多源多阶多因素耦合成藏机制。盆地西山窑组与八道湾组2套煤系地层厚度巨大,受聚煤环境控制,多层叠置统一、多层叠置独立、多层叠置混合含煤层气系统空间分布有别,基于沉积、构造、水文耦合作用归纳出煤层气富集成藏基本模式,有效厘定流体压力系统,合理选层选段、组合开发,优势成藏地质配置及其区域、局域、层域变化规律有待深入研究。盆地周缘煤储层倾角大多超过35°,急倾斜煤储层在较小空间随深度发生快速变化,储层流体运动方式、储层应力状态等影响制约压降传播和煤层气产出过程,开发过程储层力学性质与物性变�The Junggar Basin is extremely rich in coalbed methane(CBM)resources.Nearly 30 CBM exploration projects have commenced,and more than 270 CBM wells have been drilled.Some pilot test areas for the CBM development in Baiyang river,Sigong river and the eastern Urumqi river have been built,and large-scale CBM development and utilization is being promoted.In the Junggar Basin,many blocks show the momentum of high production in a single CBM well.For multiple,thick and high dip angle coal seams,the technologies including drilling along coal seam,reservoir transformation,and optimized drainage have been continuously promoted and applied,which leads to the development of CBM industry in Xinjiang.This paper systematically summarizes the special geological conditions of CBM accumulation in the Junggar Basin,scientifically analyzes the current status and trends of CBM exploration and development in the early stage,and comprehensively presents the geological problems faced by CBM exploration and development,in order to provide a reference for the efficient development of low-and medium-rank CBM in Xinjiang and even in China.The structural uplift,hydraulic dissipation,and the deep extension of the CBM aeolian oxidation zone in the basin margin are geological factors that restrict the distribution of CBM resources and the potential of CBM exploration and development,and cannot be ignored.The deep coal measure gas resources in the basin center,including CBM,have huge resource potential.It is imperative to carry out comprehensive geology research on coal measure gas and expand the exploration and development field of coal measure gas.The CBM in many blocks at the basin margin is rich in CO_(2)and presents an abnormal phenomenon that the CO_(2)concentration increases with the increase of coal seam depth.Taking the coupling effect of hydrodynamic field and hydrochemical field as the main guide,and the difference of gas composition and occurrence as clues,the source,mixing degree and accumulation contribution of multi-source and mult

关 键 词：煤层气 地质特征 勘探开发 准噶尔盆地 CO_(2)异常富集 

分 类 号：P618.11[天文地球—矿床学]