鄂尔多斯盆地西缘古生界多元油气成藏模式及勘探新领域OA
Multiple hydrocarbon accumulation models and new exploration areas in the Paleozoic strata in the western margin of the Ordos Basin,NW China
基于鄂尔多斯盆地西缘地区最新高精度重力、磁力及三维地震勘探资料,开展古生界构造体系精细解析与油气成藏条件的再认识.研究表明:①通过重新厘定断裂分级,解析出后冲带、上盘向斜、下盘原地岩体隆起带及走滑-冲断叠瓦带4类构造样式;依据源-储配置特征,建立北段横山堡"构造圈闭气藏群"、中段冲断带上盘"源内向斜致密气成藏"及下盘"隐伏隆起构造控藏"、南段"低熟页岩自生自储"、台缘带"颗粒滩+双源供烃"5种成藏模式;②结合油气勘探成效分析,评价出5个有利勘探区带:落实北段横山堡复杂构造区有利面积410km2,属于现实的高效勘探目标区;圈定中段隐伏隆起带有利面积1 800 km2,在中二叠统下石盒子组盒8段首次获得勘探突破;揭示中段石炭系羊虎沟组具备煤岩气、源内致密砂岩气成藏潜力;落实南段中奥陶统乌拉力克组海相页岩油有利面积275 km2,YT3井获得工业性突破;预测西部奥陶系台缘带有利面积约5 300 km2.以上认识对盆地西缘后续油气勘探领域的进一步突破、拓宽和规模储量的提交具有指导意义.
Based on the latest high-precision gravity,magnetic and three-dimensional seismic exploration data in the western margin of the Ordos Basin,the fine analysis of Paleozoic tectonic system and the re-understanding of hydrocarbon accumulation conditions are carried out.The research shows that,by redefining the classification of faults,four types of structural styles are identified,including back thrust belt,hanging wall syncline,footwall in-situ rock mass uplift belt,and strike-slip-thrust imbricate belt.According to the characteristics of source-reservoir configuration,five hydrocarbon accumulation models are established,including the Hengshanbao structural trap gas reservoir group in the northern zone,the tight gas accumulation in the intra-source syncline in the hanging wall and concealed uplift structure controlled accumulation in the footwallof of the thrust belt in the central zone,the low-mature shale self-generation and self-storage in the southern zone,and the grain beach+dual-source hydrocarbon supply in the platform margin.Combined with the analysis of exploration results,five favorable exploration areas are delineated:the Hengshanbao complex structural area in the northern zone,covering 410 km2,which belongs to the realistic and efficient exploration target area;the concealed uplift belt in the central zone,covering 1 800 km2,which is the first breakthrough in the 8th member of Lower Shihezi Formation;the Carboniferous Yanghugou Formation in the central zone,which has been revealed with the potential for coal-rock gas and tight sandstone gas accumulation within the source;the marine shale oil in the Middle Ordovician Wulalike Formation in the southern zone,covering 275 km2,with Well YT3 achieving an industrial breakthrough;and the western platform margin of the Ordovician strata,covering about 5 300 km2.These findings have guiding significance for further breakthrough,expansion,and reserves addition in subsequent oil and gas exploration activities in the western margin of the basin.
王红伟;魏嘉怡;徐敏;包洪平;杨智;杨亚娟;李涵;刘濮毓;张艳
中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司,西安 710018||中国石油勘探开发研究院,北京 100083中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018中国石油长庆油田公司勘探开发研究院,西安 710018||低渗透油气田勘探开发国家工程实验室,西安 710018
能源科技
鄂尔多斯盆地西缘冲断带高精度重磁勘探构造解析古生界成藏条件勘探新领域
Ordos Basinwestern margin thrust belthigh-precision gravity and magnetic seismic explorationstructural analysisPaleozoichydrocarbon accumulation conditionnew exploration area
《石油勘探与开发》 2026 (4)
812-825,14
中国石油油气与新能源分公司科技项目(2023YQXNCS001-05)长庆油田深层海相油气创新联合体项目(2024D1JC06)
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