神府深部煤层气大气田的发现与启示  

Discovery of a large gas field of deep coalbed methane in the Shenfu block and its implications

作　　者：朱光辉 季洪泉 米洪刚 张迎春 孙强[3] 赵卫[3] 朱学申 康丽芳 王宇川 ZHU Guanghui;JI Hongquan;MI Honggang;ZHANG Yingchun;SUN Qiang;ZHAO Wei;ZHU Xueshen;KANG Lifang;WANG Yuchuan(CNOOC Ltd.,Beijing 100010,China;Provincial Center of Technology Innovation Center of Coal Measure Gas Co-production,Taiyuan 030008,China;China United Coalbed Methane Co.,Ltd.,Beijing 100016,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]中海石油(中国)有限公司,北京100010 [2]三气共采省技术创新中心,山西太原030008 [3]中联煤层气有限责任公司,北京100016 [4]中海油研究总院有限责任公司,北京100028

出　　处：《煤田地质与勘探》2024年第8期12-21,共10页Coal Geology & Exploration

基　　金：国家科技重大专项项目(2016ZX05066);中海油七年行动重大项目(KJ135ZDXM40ZL01)。

摘　　要：【背景】鄂尔多斯盆地东缘神府区块历经近20年非常规天然气勘探,于2023年发现了千亿立方米深部煤层气储量。深部煤层气勘探初期,面临地质规律认识不足、压裂技术不成熟、排采工艺经验欠缺等难题。【方法和结果】通过管理和技术创新,双轮驱动,取得了良好的勘探成效。管理上,开创性施行了深部煤层气、致密砂岩气“互补式”和“立体式”勘探,打破专业壁垒、组织壁垒和业务壁垒,坚持“一井一策”,高效推进“钻−压−排”一体化。技术上,提出“微相控煤、源热控烃、温压控态”的深部煤层气成藏模式,建立选区标准并落实富集区,形成了地质−工程“甜点”评价技术,并探索应用复合立体缝网改造技术实现煤储层的改造体积最大化和渗流能力最优化,因地制宜地提出“快速返排−多级控压−阶梯稳步提产”的排采思路,形成欠饱和井、饱和井两大类排采制度,明确不同排采阶段的目标原则,建立3类井底流压下降模式,支撑探井达产稳产。【意义】通过一系列的管理和技术创新,神府大气田成功发现,展示了鄂尔多斯盆地东缘深部煤层气勘探开发的广阔前景,对我国类似盆地资源勘探和非常规油气增储上产具有重要指导意义。[Background]After explorations of unconventional natural gas for nearly two decades in the Shenfu block on the eastern margin of the Ordos Basin,deep coalbed methane(CBM)with reserves of 100 billion m^(3) was discovered in this block in 2023.However,the preliminary exploration of deep CBM in this block faces challenges of insufficient understanding of geological laws,immature fracturing technologies,and a lack of production technologies and experience.[Methods and Results]Driven by both management and technological innovations,encouraging exploration results have been achieved.The management innovations include:(1)The implementation of a complementary and three-dimensional exploration model of deep CBM and tight sandstone gas.(2)The removal of the barriers of disciplines,organization,and businesses.(3)The preformation of one strategy for one well.(4)The efficient promotion of the drilling,fracturing,and drainage integration.The technical innovations encompass:(1)The deep CBM accumulation pattern featuring microfacies-controlled coal development,thermal maturity-controlled hydrocarbon generation,and temperatureand pressure-controlled occurrence states.(2)The criteria for exploration target selection,allowing for the identification of the enrichment areas of deep CBM,and the assessment technology for geological-engineering dual“sweet spots”.(3)The exploration of a composite technique for three-dimensional fracture network stimulation to maximize the stimu-lated volumes and optimize the seepage capacity of coal reservoirs.(4)A production approach comprising rapid back-flow of fracturing fluids,multi-stage pressure control,and stepped steady increase in production developed according to local conditions.This assists in forming two production systems,namely undersaturated-and saturated-CBM wells,de-termining the targets and principles of different stages,and establishing three decline modes of bottomhole flow pres-sure to achieve the designed capacity and steady production of exploration wells.[Significance]These

关 键 词：鄂尔多斯盆地 神府区块 深部煤层气 致密砂岩气 互补式勘探 立体式勘探 大气田 

分 类 号：P618.13[天文地球—矿床学]