Oil and gas resources potentials, exploration fields and favorable zones in foreland thrust belts

doi:10.3969/j.issn.1672-7703.2019.01.006

Abstract

Abstract: Significant achievements have been made in exploring foreland thrust belts, which promoted the exploration process of large oil and gas provinces in foreland basins since the 12^th Five-Year Plan and further consolidated the resource base of the West-East Gas Pipeline. However, the recent exploration progress has become slow. On the one hand, it brought a large potential for increasing reserves, and on the other hand, there are many challenges. There is a good prospect of exploration in this area. Based on references, follow-up of exploration and research progress, the results of the fourth oil and gas resources evaluation and the latest understanding of exploration, the important exploration fields and potential accumulation conditions have been investigated in the foreland thrust belts in Kuqa of the Tarim Basin, the southwestern Qaidam Basin, the northwestern Sichuan Basin, the southern margin of Junggar Basin, and the southwestern Tarim Basin. Source rocks, reservoirs, caprocks, accumulation factors, traps and preservation conditions have been analyzed, potential favorable zone evaluation and optimization has been finished based on exploration targets, favorable areas, resource scales, structures and trap types, expected reserves, favorable factors and geological risks, and finally 7 implementable zones, 6 alternate zones and 9 preparatory zones are proposed, which will provide natural gas geological reserves of 6500×10⁸m³ and oil geological reserves of 3.5×10⁸t in 5 years. Four key geological problems have been analyzed, involving building complex 3D models, predicting favorable belts and good reservoirs, hydrocarbon accumulation difference and factors configuration, and effective evaluation to structural traps, as well as supporting technologies such as precise imaging of complex structures, low SNR, (residual) static correction, safe and efficient drilling. Taking the northern tectonic belt in Kuqa foreland, the foreland thrust belt in southwestern Tarim, and the foreland thrust belt in northwestern Sichuan Basin as examples, exploration strategies and deployment recommendations are proposed.

Key words: foreland thrust belt, exploration status, oil and gas resources potential, exploration field, accumulation conditions, comprehensive evaluation, favorable zone

CLC Number:

Yu Yuanjiang, Yang Tao, Guo Bincheng, Xu Xiaoxi, Zhan Lufeng, Yang Chao. Oil and gas resources potentials, exploration fields and favorable zones in foreland thrust belts[J]. China Petroleum Exploration, 2019, 24(1): 46-59.

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