| Citation: | WU Zhenyun，DENG Hanxiao，WANG Li，et al. Extraction of hydrocarbon microleakage alteration information and interpretation analysis of shallow faults: a case study of the Quele area, Kuqa depression[J]. Bulletin of Geological Science and Technology，2025，44（6）：1-15 doi: 10.19509/j.cnki.dzkq.tb20250007
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The Quele area of the Kuqa Depression features favorable geological conditions, abundant oil and gas resources, well-developed salt structures, and complex fault systems, collectively creating ideal conditions for upward hydrocarbon migration and the resulting surface hydrocarbon microseepage alteration anomalies. This study investigates the characteristics of hydrocarbon microseepage during upward migration in the area and examines its relationship with shallow faults, providing a theoretical basis for further structural analysis of oil and gas reservoirs.
This study primarily utilized Sentinel-2A satellite imagery as the main data source. Principal Component Analysis (PCA) was applied to identify the spatial distribution patterns of hydrocarbon microseepage. By combining seismic profile interpretation and field investigations, we comprehensively analyzed the hydrocarbon microseepage characteristics in the Quele area.
The results reveal significant spatial variability in hydrocarbon microseepage across the Quele area. In regions such as the eastern Awate fold belt, Kalayuergun slip fault zone, and the Quele salt nappe (Quele fault), hydrocarbon microseepage anomalies are more pronounced, with observable surface manifestations. In contrast, the Miskantage anticline area exhibits relatively weak hydrocarbon microseepage, with nearly no discernible surface alteration signs.
The study demonstrates a strong correlation between hydrocarbon microseepage alteration and surface-exposed faults in the Quele area. Field investigations and seismic profile analysis further indicate that the fault on the southern flank of the Miskantage anticline is a hidden fault, not extending through the strata to the surface, and therefore not inducing surface hydrocarbon microseepage alteration.
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