煤田地质与勘探2024，Vol.52Issue(8)：12-21,10.DOI:10.12363/issn.1001-1986.24.02.0089
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
摘要
Abstract
[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 m3 was discovered in this block in 2023.However,the preliminary exploration of deep CBM in this block faces challenges of insufficient un-derstanding 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-di-mensional exploration model of deep CBM and tight sandstone gas.(2)The removal of the barriers of disciplines,organ-ization,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 fea-turing microfacies-controlled coal development,thermal maturity-controlled hydrocarbon generation,and temperature-and 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 management and technological innovations have contributed to the discovery of the large gas field in the Shenfu block,demonstrating great prospects for the exploration and production of deep CBM on the eastern margin of the Ordos Basin.Therefore,this study serves as a significant guide for resource exploration in similar basins,along with the reserve growth and pro-duction addition of unconventional oil and gas,in China.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Key words
Ordos Basin/Shenfu block/deep coalbed methane(CBM)/tight sandstone gas/complementary exploration/three-dimensional exploration/large gas field分类
天文与地球科学引用本文复制引用
朱光辉,季洪泉,米洪刚,张迎春,孙强,赵卫,朱学申,康丽芳,王宇川..神府深部煤层气大气田的发现与启示[J].煤田地质与勘探,2024,52(8):12-21,10.基金项目
国家科技重大专项项目(2016ZX05066) （2016ZX05066）
中海油七年行动重大项目(KJ135ZDXM40ZL01) （KJ135ZDXM40ZL01）
