鄂尔多斯盆地侏罗系油藏成藏主控因素及勘探潜力

doi:10.3969/j.issn.1672-7703.2025.03.007

摘要/Abstract

摘要： 鄂尔多斯盆地侏罗系勘探50年来持续取得突破，为明确其控藏因素及勘探潜力，基于前期已发现油藏及完钻探评井，利用钻井地质资料、岩心分析及地震资料，系统开展盆地前侏罗纪古地貌、砂体、构造的精细刻画，分析三维区断层发育特征，明确研究区侏罗系油藏类型及控制因素，指出盆地侏罗系勘探方向及潜力。结果表明：（1）前侏罗纪古地貌呈“U+V”形多阶古河结构，发育河间丘、阶地等9类细分单元，控藏特征显著；（2）侏罗系油源主要来自三叠系长7段烃源岩，晚侏罗世—早白垩世幕式充注为油藏广布奠定基础；（3）古河与低幅度鼻隆构造耦合控制油藏集群分布，三期断层接力输导形成立体成藏模式；（4）盆地西缘断裂复杂区、靖边斜坡东北部及成熟区精细勘探仍具亿吨级资源潜力。

关键词: 鄂尔多斯, 侏罗系, 古地貌, 控制因素, 勘探潜力

Abstract: Over the past 50 years, breakthroughs have continuously been made in the exploration of the Jurassic system in Ordos Basin. Based on early discovered oil reservoirs and exploration and appraisal wells, drilling geological data, core analysis, and seismic data have been used to finely characterize the pre Jurassic paleogeomorphology, sand bodies, and structures in the basin and analyze characteristics of fault development in the 3D seismic area, identifying the types of Jurassic oil reservoirs in the study area and controlling factors, and pointing out further exploration orientations and potential of the Jurassic system in the basin. The study results show that: (1) The pre Jurassic paleogeomorphology presented a “U+V”-shaped multi-level ancient river structure, with nine types of small units such as inter-river hill and terrace, which significantly controlled oil reservoir types; (2) The Jurassic oil reservoirs were mainly generated by source rocks in the seventh member of the Triassic Yanchang Formation, and the episodic oil charging in the Late Jurassic–Early Cretaceous laid the foundation for the wide distribution area of oil reservoirs; (3) The coupling of ancient rivers and low-amplitude nose uplift structures controlled the distribution of oil reservoir clusters, and a stereoscopic hydrocarbon accumulation pattern was formed by a three-stage fault relay transport; (4) There is still huge resource potential with a level of 100 million tons in complex fault zones in the western basin margin and the northeastern part of Jingbian slope, as well as mature areas through fine exploration.

Key words: Ordos Basin, Jurassic, paleogeomorphology, control factor, exploration potential

中图分类号:

TE122.1

李成, 张晓辉, 史立川, 王治涛, 蒲磊. 鄂尔多斯盆地侏罗系油藏成藏主控因素及勘探潜力[J]. 中国石油勘探, 2025, 30(3): 92-108.

Li Cheng, Zhang Xiaohui, Shi Lichuan, Wang Zhitao, Pu Lei. Main controlling factors and exploration potential of the Jurassic oil reservoirs in Ordos Basin[J]. China Petroleum Exploration, 2025, 30(3): 92-108.

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