New understanding of hydrocarbon accumulation and exploration potential in risk exploration field in Ordos Basin

doi:10.3969/j.issn.1672-7703.2023.03.004

Abstract

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.

CLC Number:

TE122.11

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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