Great discovery and its significance in the Ordovician in Well Fudong 1 in Fuman Oilfield, Tarim Basin

doi:10.3969/j.issn.1672-7703.2023.01.005

Abstract

Abstract: A major breakthrough has been obtained in the high-energy platform marginal beach in the second member of the Ordovician Yingshan Formation in Well Fudong 1 drilled in the transitional zone of Awati Sag-Manjiar Sag in Tarim Basin, which is of great significance to the understanding of hydrocarbon accumulation in the inner carbonate rocks. Based on the in-depth studies on hydrocarbon accumulation conditions, reservoir properties and hydrocarbon sources in Well Fudong 1, the hydrocarbon accumulation assemblage in the eastern Fuman Oilfield is identified, which is composed of source rock of the deep Cambrian Yuertus Formation, reservoir of the high-energy platform marginal beach body, and cap rock of the overlying tight carbonate rocks, as well as a new complex hydrocarbon accumulation pattern is established, namely “hydrocarbon supply by the Cambrian, reservoir and oil source connection by secondary network faults, vertical hydrocarbon transport, and reservoir of fault-controlled high-energy beach body”. The success of Well Fudong 1 confirms that the high-energy platform marginal beach reconstructed by the secondary network faults has the capacities of reservoir development and hydrocarbon accumulation, breaking through the exploration forbidden zone in ultra-deep high-energy beach carbonate rocks with a depth of greater than 8000 m, and expanding the understanding on hydrocarbon accumulation pattern in fault-controlled carbonate reservoir. In addition, it is a successful practice of exploration idea of “high-energy platform marginal beach body + secondary network fault oil and gas reservoir”, which supports to open a new situation of exploration in Lunnan-Fuman platform marginal zone and lead the exploration deployment of ultra-deep complex marine carbonate rocks in Tarim Basin.

CLC Number:

TE112

Wang Qinghua, Yang Haijun, Zhang Yintao, Li Yong, Yang Xianzhang, Zhu Yongfeng, HanJianfa, Xie Zhou. Great discovery and its significance in the Ordovician in Well Fudong 1 in Fuman Oilfield, Tarim Basin[J]. China Petroleum Exploration, 2023, 28(1): 47-58.

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