Oil and gas accumulation assemblages in deep to ultra-deep formations and
exploration targets of petroliferous basins in Xinjiang region

doi:10.3969/j.issn.1672-7703.2021.04.001

Abstract

Abstract: In recent years, the global petroleum exploration and development in deep formations have been accelerated and major discoveries achieved successively, proving great exploration potential of deep formations. The petroliferous basins in Xinjiang region have abundant oil and gas resources in deep to ultra-deep formations, which lays solid energy foundation and provides guarantee for China’s oil and gas strategy. However, exploration potential and targets are not clear due to the multiple exploration fields in deep formations and complex hydrocarbon enrichment law. As a result, the further identification of key exploration fields and oil and gas plays of deep to ultra-deep formations are of great significance. In this paper, geotectonic setting and its evolution in Xinjiang region are analyzed, basic petroleum geological conditions of deep formations and characteristics of oil and gas accumulation assemblages compared and studied in three major basins (Tarim, Junggar and Tuha Basins), and exploration fields of deep formations systematically studied of the three basins. By analyzing typical oil and gas reservoirs, various hydrocarbon accumulation patterns are established for different exploration fields of deep formations, and controlling factors of hydrocarbon accumulation and characteristics of oil and gas distribution further understood. The study results indicate that the hydrocarbon accumulation conditions are superior of deep formations in the Cambrian subsalt, foreland thrust belt in Kuqa Depression and piedmont area in the southwestern Tarim Basin, Permian-Triassic in the Central Depression, lower assemblage in the southern margin and shale oil of Permian in Junggar Basin, and Permian-Triassic in Taibei Sag and deep Carboniferous in Tuha Basin, which are important exploration plays to look for large-scale reserve and major breakthroughs in the future.

CLC Number:

TE112

Kuang Lichun, Zhi Dongming, Wang Xiaojun, Li Jianzhong, Liu Gang, He Wenjun, Ma Debo. Oil and gas accumulation assemblages in deep to ultra-deep formations and exploration targets of petroliferous basins in Xinjiang region[J]. China Petroleum Exploration, 2021, 26(4): 1-16.

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Oil and gas accumulation assemblages in deep to ultra-deep formations and exploration targets of petroliferous basins in Xinjiang region

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