New discovery in exploration of Cambrian-Ordovician dolomite buried hills in Tarim Basin and its significance

doi:10.3969/j.issn.1672-7703.2017.03.001

Abstract

Abstract: Since the breakthrough was made in Well Central Tarim 1 in 2008, oil and gas exploration in the Cambrian-Ordovician dolomite buried hills has been continued in the Tarim Basin. Except that effective exploration and development was carried out in the Yaha-Yingmaili Cambrian dolomite buried hill in the northern North Tarim uplift, only two wells, Central Tarim 1 and Shan 1, revealed oil and gas in the Central Tarim uplift-Bachu uplift belt. All regional exploration operations failed, and the exploration in the dolomite buried hills in this belt almost stalled for over 20 years. In 2016, after further understanding of the structural model and analysis of the hydrocarbon accumulation conditions, two wells (Ross 2 and Zhonggu 58) were drilled in the Maigaiti slope and the eastern Central Tarim uplift, respectively, and delivered high-yield of industrial oil and gas flow from the dolomite buried hills. This recorded a new discovery in the exploration of dolomite buried hills and indicated the important exploration value in the Cambrian-Ordovician dolomite buried hills. Re-processing and re-interpretation of 2D and 3D seismic data confirmed three dolomite buried hill zones in the eastern Central Tarim uplift, the Luonan- Niaoshan structural belt and the East Mahu structural belt, covering a favorable area of 1600 km₂. Reservoirs in the dolomite buried hills are characterized by shallow depth (3500-5500 m) and high exploration efficiency, showing large exploration potentials.

Key words: Tarim Basin, Cambrian-Ordovician, dolomite buried hill, hydrocarbon accumulation condition, exploration potential

CLC Number:

TE122.1

Xie Huiwen, Neng Yuan, Jing Bing, Zhu Yongfeng, Wang Bin. New discovery in exploration of Cambrian-Ordovician dolomite buried hills in Tarim Basin and its significance[J]. China Petroleum Exploration, 2017, 22(3): 1-11.

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