Contribution Accumulation Conditions and Exploration Prospect of Basement Rock Formation, the Central Paleo-Uplift Belt in Northern Songliao Basin

Abstract

Basement rock formation of the central paleo-uplift belt is one of the important areas of gas risk exploration in Northern Songliao Basin, which has good gas accumulation conditions. However, no great progress has been made for many years, and the conditions of accumulation conditions have been questioned due to the restriction of vertical migration. Based on cores, well logging, wire logging, 3D seismic, gravity and magnetism data, the author studied the gas accumulation conditions and further exploration directions of basement rock formation, the central paleo-uplift belt in Northern Songliao Basin through a great deal of statistical analysis and geological analysis. The results show that: ① the central paleo-uplift belt was extruded in the early stage and stretched in the late stage, forming the buried hill uplift belt with the character of thrust-fold basement; ② the Shahezi formation in Xujiaweizi fault depression is thick, rich in organic matter and abundant in resources, which provides sufficient gas source for the reservoir in the central paleo-uplift belt; ③ there are mainly 2 types and 5 types of reservoir in the central paleo-uplift belt; ④ the central paleo-uplift belt contains crust structural gas pools and inner gas pools, and the reservoir-forming model of the central paleo-uplift belt is established, which is characterized by Neogenic paleo-reservoir and lateral migration. Furthermore, the conditions of exploration direction are defined, which is the direction for the risk exploration and deployment of bedrock natural gas of basement rock formation, the central paleo-uplift belt in Northern Songliao BasinKeywordsThe central paleo-uplift beltNorthern Songliao BasinRisk explorationGas accumulation conditionsExploration prospect