摘要
深部煤层气是我国非常规天然气的重要接替资源,但其勘探程度偏低,对煤储层组成与物性特征的系统认识明显不足。构建深部储层物性评价指标体系,对深化资源认知并推动及有利区优选具有关键意义。针对吐哈盆地台北凹陷柯柯亚地区西山窑组1+2号主力煤层,利用岩心分析、实验测试等方法,分析了煤储层基本地质特征和物性特征,建立了煤储层评价指标体系,构建了煤层气勘探潜力(U)的多层次模糊数学预测模型,并预测了研究区目的层煤层气开发有利区。(1)西山窑组煤层厚度大,以镜质组为主的褐煤、长焰煤发育,储层物性条件良好;(2)建立的煤储层评价指标主要包括煤层含气量、煤厚、埋深、镜质组含量、镜质体反射率、固定碳含量、孔隙度、渗透率、脆性指数及煤体结构;(3)煤层气勘探潜力U≥0.4为有利区,0.35≤U≤0.4为较有利区,0.25≤U≤0.35为一般有利区,U<0.25则为不利区;(4)柯柯亚地区煤层气有利区呈分散状,主要分布在中部K32、K35、K192井区及东北部K282井区。研究成果可为吐哈盆地柯柯亚地区深部煤层气井井位确定提供依据。
Deep coalbed methane(CBM)is a key successor resource within China's unconventional natural gas portfolio.However,its exploration remains at a relatively low level,and there is a lack of systematic understanding of the composition and physical properties of deep coal reservoirs.Establishing a property evaluation index system tailored to deep coal reservoirs is essential for enhancing resource understanding and promoting the identification of favorable exploration zones.The deep coalbed methane(CBM)resources in the Turpan-Hami Basin are abundant,with the Jurassic Xishanyao(J_(2)x)Formation coal seams in the Kekeya area of the Taibei Sag serving as a key target for current deep CBM exploration and development.Taking the No.1 and 2 main coal seams of the J_(2)x Formation in the Kekeya area as an example,this study analyzed the basic geological and physical properties of the coal reservoir through core analysis and experimental testing.An evaluation index system for coal reservoirs is established.Based on this,a multi-level fuzzy mathematical prediction model for the exploration potential(U)of coalbed methane is constructed,and the favorable areas for the development of coalbed methane in the target layer of the study area are predicted.The results are as follows:(1)The J_(2)x Formation coal seams exhibit significant thickness,with vitrinite-dominated maceral composition and coal ranks primarily classified as lignite to long flame coal,indicating favorable reservoir physical conditions.(2)The established evaluation indicators of coal reservoirs mainly include encompassing gas content,coal thickness,coal seam burial depth,vitrinite content,vitrinite reflectance(Ro),fixed carbon content,porosity,permeability,brittleness index,and coal structure.(3).The exploration potential of coalbed methane U≥0.4 is a favorable area,0.35≤U≤0.4 is a relatively favorable area,0.25≤U≤0.35 is a generally favorable area,and U<0.25 is an unfavorable area.(4)The favorable CBM zones in the Kekeya area are distributed sporadically,primarily concentrated in the central well areas(K32,K35,K192)and the northeastern well area(K282).The research results can provide a basis for determining the well locations of deep coalbed methane Wells in the Kekeya area of the Tuha Basin.
作者
穆金峰
王兴刚
张华
李鑫
龚万兴
刘源
龙飞
梁辉
任艳泽
MU Jinfeng;WANG Xinggang;ZHANG Hua;LI Xin;LGONG Wanxing;LIU Yuan;LONG Fei;LIANG Hui;REN Yanze(PetroChina Tuha Oilfeld Company,Hami,Xinjiang 8390092,China;Xinjiang Research Institute of Huairou Laboratory,Urumuqi,Xinjiang 830000,China;Research Institute of Exploration&Development,PetroChina Tuha Oilfeld Company,Hami,Xinjiang 839009,China;College of Geology and Mining Engineering,Xinjiang University,Urumqi,Xinjiang 830017,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Exploration Division of Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839009,China)
出处
《钻采工艺》
北大核心
2025年第3期172-180,共9页
Drilling & Production Technology
基金
新疆维吾尔自治区重点研发专项项目“新疆地区中低煤阶煤层气富集机理研究与先导示范”(编号:2024B03002)
新型油气勘探开发国家科技重大专项“新疆地区中低煤阶煤岩气高效开发技术与集成示范”(编号:2024ZD1406000)
中国石油天然气股份有限公司攻关性应用性科技重大专项课题“深地煤岩气成藏理论与效益开发技术研究”(编号:2023ZZ18-03)
新疆维吾尔自治区“天山英才”优秀工程师培养计划“哈密深层富油煤原位干馏有利区优选及前期开发机理研究”
中国石油青年科技专项“吐哈盆地深层中低煤阶煤岩气孔裂隙结构禀赋与游离气赋存规律”(编号:2024DQ03025)联合资助。
关键词
吐哈盆地
台北凹陷
深部煤层气
评价指标
有利区优选
Tuha Basin
Taibei Sag
deep coalbed methane
evaluation indicators
optimal selection of favorable areas
