Analysis of natural gas accumulation conditions and exploration perspective in the central paleo-uplift belt (north), Songliao Basin

doi:10.3969/j.issn.1672-7703.2017.05.001

Abstract

Abstract: The central paleo-uplift belt (north) of the Songliao Basin, as one major region of risk exploration of natural gas, has favorable conditions for natural gas accumulation. However, no breakthrough has been made in this region for decades, and the hydrocarbon accumulation conditions and exploration perspective have not been thoroughly studied. This paper analyzes natural gas accumulation conditions and exploration targets in the central paleo-uplift belt (north) using core, mud logging, well logging, 3D seismic, gravity and magnetic data as well as a great deal of statistics, analysis and geology studies, and proposes new four cognitions:(1) the central paleo-uplift belt has features of buried hill and was formed on the thrust folded base; (2) the source rock has a high organic matter abundance, huge gas generating potentials and strong lateral gas supplies in the Shahezi Formation of the Xujiaweizi rift in the east of the central paleo-uplift belt (north); (3) the central paleo-uplift belt (north)contains four types of reservoirs:granite, metamorphite, conglomerate and sandstone; (4) the central paleo-uplift belt (north)contains three types of traps, two sets of conductive systems and three types of gas pools. Based on the results, the exploration targets of the basement buried hill gas pools and the gully lithologic gas pools have been selected, 10 class I and 6 class Ⅱ exploration regions have been evaluated and optimized. This provides the scientific base for risk exploration of deep gas reservoirs in the central paleo-uplift belt (north), the Songliao Basin.

Key words: drape, gully, basement buried hill, natural gas accumulation condition, central paleo-uplift belt (north), Songliao Basin

CLC Number:

TE122.1

Du Jinhu. Analysis of natural gas accumulation conditions and exploration perspective in the central paleo-uplift belt (north), Songliao Basin[J]. China Petroleum Exploration, 2017, 22(5): 1-14.

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