海相油气地质2026，Vol.31Issue(3)：301-306,6.DOI:10.3969/j.issn.1672-9854.2026.03.008
鄂尔多斯盆地中东部二叠系太原组灰岩天然气成藏特征及资源潜力
Accumulation characteristics and resource potential of natural gas in the Permian Taiyuan Formation limestone in central-eastern Ordos Basin
摘要
Abstract
The exploration breakthrough of the Hengshan Gasfield in the Permian Taiyuan Formation limestone,regarded as a non-effective reservoir in a long term,has demonstrated its significant accumulation potential in the central-eastern Ordos Basin.This study systematically analyzes the geological conditions controlling natural gas accumulation and reveals a"sandwich-type"accumulation model,in which the coal seams of No.5 in the Shanxi Formation and No.8 in the Benxi Formation respectively served as source rocks,directly contact the limestone reservoir,and a high source-reservoir pressure difference about 8–12 MPa drives efficient gas charging.Bioclastic shoals(porosity of 2.6%,and thickness of 4–10 m)and bioherms(thickness of 2 – 6 m,dissolution pores developed)are identified as high-quality reservoirs,with fractures and penecontemporaneous karstification jointly improving reservoir performance.By integrating the volumetric method,small-element volumetric method,resource abundance analogy,and basin modeling,the total in-place natural gas resources of the Taiyuan Formation limestone are estimated at 1.553 5×1012 m3,with the remaining unproven resources amounting to 1.544 7×1012 m3.The bioclastic shoal facies has the highest enrichment(about 53.1%of the remaining unproven resources),being the priority exploration target.This study provides a critical basis for increasing natural gas reserves and production in the Ordos Basin and for evaluating similar tight carbonate gas reservoirs.关键词
灰岩/天然气/成藏模式/资源潜力/太原组/鄂尔多斯盆地Key words
limestone/natural gas/accumulation model/resource potential/Taiyuan Formation/Ordos Basin分类
能源科技引用本文复制引用
曹晶晶,董国栋,胡新友,裴文超,殷亮亮,赵小会,叶蕾,宋佳瑶..鄂尔多斯盆地中东部二叠系太原组灰岩天然气成藏特征及资源潜力[J].海相油气地质,2026,31(3):301-306,6.基金项目
本文受国家科技重大专项项目"鄂尔多斯盆地全油气系统与新领域勘探技术"(编号:2025ZD1400200)、中石油矿业权区及周边空白区油气资源评价(编号:QGYQZYPJ2022-1)和中石油油气成藏远景区划(编号:QGYQCCQH2025-1)联合资助 （编号:2025ZD1400200）
