Petroleum Exploration History and Enlightenment of Biyang Sag and Nanyang Sag in Nanxiang Basin

doi:10.7657/XJPG20210313

Abstract

Abstract:

The Nanxiang basin is composed of three swells and four sags. Over more than 40 years of exploration, oil and gas have been discovered in the Biyang sag and Nanyang sag, and fruitful achievements have been obtained. Mainly based on the three peaks of reserves increase in the process of exploring the Biyang sag and the Nanyang sag, this paper divides the basin exploration process into three stages: initial exploration (1970-1983), comprehensive exploration (1984-1999) and detailed exploration (since 2000). After analyzing the major achievements of each stage, it is found that oil and gas enrichment laws in the Biyang sag are more clear and the reservoir types are more representative than those in the Nanyang sag. The Biyang sag can be divided into four important oil and gas enrichment zones: Shuanghe nose-like structure, northern slope zone, southern steep slope zone and around-subsag zone. According to comprehensive analysis of geological characteristics and reservoir-forming conditions, specific exploration ideas, techniques and methods are summarized, including large updip pinch-out sandstone reservoirs in the rifted lacustrine basin, complex fault-block reservoirs in the northern slope zone, small glutenite reservoirs in the southern steep slope zone, and fault-lithologic reservoirs in the around-subsag zone. These results may enlighten future oil and gas exploration.

Key words: Naxiang basin, Biyang sag, Nanyang sag, updip pinch-out sandstone reservoir, fault-block reservoir, sandy conglomerate reservoir, exploration history, exploration enlightenment

CLC Number:

TE132

YUAN Yuzhe, LUO Jiaqun, ZHU Yan, LIU Guilan, LI Lei, YU Mengli. Petroleum Exploration History and Enlightenment of Biyang Sag and Nanyang Sag in Nanxiang Basin[J]. Xinjiang Petroleum Geology, 2021, 42(3): 364-373.

Figures/Tables 8

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