鄂尔多斯盆地风险勘探领域油气成藏认识新进展与勘探潜力

doi:10.3969/j.issn.1672-7703.2023.03.004

摘要/Abstract

摘要： 近年来，通过创新地质认识，突出风险勘探、强化规模勘探、精细效益勘探，鄂尔多斯盆地油气勘探取得丰硕成果；2020—2022年，年产量均超过6000×10⁴t油当量，其中风险勘探在“四新”领域的探索过程中发挥了重要作用。在前期研究工作的基础上，通过深化奥陶系盐下、二叠系太原组石灰岩、三叠系延长组长7段页岩油等领域油气成藏条件分析，创新形成“盐下源内白云岩丘滩体含气新系统”“太原组石灰岩‘三明治’成藏模式”“长7₃纹层型页岩油甜点标准和特有工艺改造技术”等成藏认识和技术成果，成为“十五五”及中长期油气勘探的接替领域。同时，突出“向源、向新、向深”的勘探理念，按重点攻关和区带准备两个层次，重新认识盆地低勘探程度区带油气成藏特征与勘探潜力，指出了今后一个时期风险勘探领域的前景与方向。其中重点攻关方向为已经发现勘探苗头且资源潜力较大的领域，优选出奥陶系海相页岩气、延长组下组合、煤系致密气及元古宇长城系等主要方向；区带准备则针对具备基本油气成藏条件，但研究程度较低且勘探难度较大的领域，提出中央古隆起周缘寒武系、西缘复杂构造区及盆地东部盐下马家沟组马三段—马二段新层系等具有较大勘探潜力目标。通过风险勘探领域的地质认识、成果总结和潜力分析，将实现盆地后备油气勘探区带的有序接替，以及起到对长庆油田二次加快发展战略需求重要的指导作用。

关键词: 鄂尔多斯盆地, 风险勘探, 成藏新认识, 勘探成果, 攻关目标, 区带准备

Abstract: In recent years, fruitful achievements have been obtained in petroleum exploration in Ordos Basin by innovating geological understanding,highlighting risk exploration, strengthening large-scale exploration, and focusing on benefit exploration, with annual output exceeding 60 million tons of oil equivalent during the 2020-2022, in which risk exploration has played an important role in the exploration of “four new” fields. Based on the previous research results and the deep analysis of hydrocarbon accumulation conditions of the Ordovician subsalt, limestone in the Permian Taiyuan Formation, and shale oil in the seventh member of the Triassic Yanchang Formation (Chang 7 member), the innovative understanding of hydrocarbon accumulation and technical achievements have been formed, including the “new gas-bearing system in the subsalt dolomite mound beach body within source rock”, “sandwiched hydrocarbon accumulation pattern of Taiyuan Formation limestone”, and “sweet spot evaluation standard and special reservoir reconstruction technology for the laminated shale oil in Chang 7₃ sub member”, which have grown to be the replacement fields during the 15^th Five-Year Plan period and in the medium-long term. Meanwhile, by highlighting the exploration concept of “marching towards source rocks,new fields, and deep formations”, the characteristics of hydrocarbon accumulation and exploration potential in zones with low exploration degree are re-recognized according to two levels of key research orientation and zone preparation, and the prospects and orientation of risk exploration fields in the future are proposed. Among them, the key research orientation refers to the zones that have promising signs and great resource potential, mainly including the Ordovician marine shale gas, lower combination of Yanchang Formation, tight gas in coal measures and the Proterozoic Great Wall System; While the zone preparation aims at zones with basic hydrocarbon accumulation conditions, but low research degree and high exploration difficulty, such as the Cambrian in the peripheral of the central paleo uplift, complex structural areas in the western basin margin, and new series of the third-second members of the subsalt Majiagou Formation (Ma 3-Ma 2 members) in the eastern basin. The new geological understanding, achievement summary, and potential analysis of the risk exploration fields will support to achieve the orderly replacement of exploration zones in the basin and play an important guiding role in accelerating the further strategic development of Changqing Oilfield.

中图分类号:

TE122.11

席胜利, 刘新社, 任军峰, 刘刚, 张才利, 惠潇, 赵伟波, 王红伟, 井向辉, 董国栋, 魏嘉怡, 李涵. 鄂尔多斯盆地风险勘探领域油气成藏认识新进展与勘探潜力[J]. 中国石油勘探, 2023, 28(3): 34-48.

Xi Shengli, Liu Xinshe, Ren Junfeng, Liu Gang, Zhang Caili, Hui Xiao, Zhao Weibo, Wang Hongwei, Jing Xianghui, Dong Guodong, Wei Jiayi, Li Han. New understanding of hydrocarbon accumulation and exploration potential in risk exploration field in Ordos Basin[J]. China Petroleum Exploration, 2023, 28(3): 34-48.

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