地质通报2026，Vol.45Issue(7)：1262-1283,22.DOI:10.12097/gbc.2024.10.022
渝东南地区五峰组—龙马溪组页岩含气性差异主控因素及资源潜力评价
Main controlling factors for variations in gas content and resource potential assessment of the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation shale,Southeastern Chongqing
摘要
Abstract
[Objective]The evaluation of shale gas-bearing properties plays a pivotal role in shale gas exploration and development.The associated parameters are fundamental for resource assessment,prospective zone prioritization,delineation of sweet spot targets,and formulation of development plans.[Methods]This study focuses on the Wufeng Formation-First Member of Longmaxi Formation shale in Southeastern Chongqing.By integrating multiple methods including field tests,laboratory analyses,and well logging interpretation,the influencing factors of its gas-bearing capacity were analyzed.[Results]The research findings indicate that the gas-bearing properties of the shale in this region exhibit pronounced variations both vertically and horizontally.Vertically,the total gas content of sub-layers ⑥～⑨ ranges from 0.33 to 4.30 m3/t,with an average of 1.47 m3/t.In contrast,that of sub-layers ①～⑤ spans from 0.77 to 10.88 m3/t,averaging 3.55 m3/t.Evidently,the gas-bearing properties enhance from the upper layers to the lower ones.Horizontally,the average total gas content of the high-quality shale segments outside the basin,along the basin margin,and within the basin amounts to 3.04 m3/t,3.46 m3/t,and 4.27 m3/t respectively.Moving from the exterior to the interior of the basin,the gas-bearing properties progressively improve,accompanied by a successive increase in single-well production.[Conclusions]The factors influencing the gas-bearing properties of shale can be categorized into static and dynamic types.The quality of the shale reservoir represents a foundational static factor.Variables such as the sedimentary environment,lithology,and total organic carbon(TOC)content determine the original hydrocarbon generation and supply capacities.Preservation conditions,a crucial static factor,encompass parameters like burial depth,distance from the erosional zone,and fault characteristics.These conditions exert a significant influence on the formation pressure coefficient and the retention of shale gas within the reservoir.Reservoir formation and evolution constitute decisive dynamic factors.Disparities in the timing of tectonic deformation and shale gas escape lead to alterations in the total gas content and the proportion of free gas,ultimately impacting single-well production.Based on key parameters including material basis(source rock conditions),preservation conditions,and gas-bearing properties,the total shale gas resources in Southeastern Chongqing are comprehensively evaluated to be 2.06×1012 m3,of which the resources within the Class I area amount to 3458×108 m3.关键词
页岩含气性/五峰组—龙马溪组/保存条件/富集规律/主控因素/渝东南地区Key words
shale gas-bearing property/Wufeng Formation-Longmaxi Formation/preservation conditions/patternof enrichment/main controlling factors/Southeastern Chongqing area分类
天文与地球科学引用本文复制引用
马军..渝东南地区五峰组—龙马溪组页岩含气性差异主控因素及资源潜力评价[J].地质通报,2026,45(7):1262-1283,22.基金项目
中国石化科技项目《渝东南地区浅层页岩气勘探开发关键技术》(编号:P24115)、《渝东南盆外常压页岩气富集模式与评价关键技术研究》(编号:P25030)和中国石化华东油气分公司科技项目《盆外中浅层常压页岩气吸附解析机理与目标评价》(编号:HDF/KJ2024-10) Supported by SINOPEC Science and Technology Projects(Nos.P24115,P25030)and the Science and Technology Projects of Sinopec East China Oil and Gas Company(No.HDF/KJ2024-10) （编号:P24115）
