Dynamic tracking of dominant migration pathways for natural gas:An example from Baimamiao gas reservoir in West Sichuan Depression
The distribution of dominant migration pathways for oil and gas is influenced by various geological factors,including migration dynamics,transport systems,source rocks,traps,and their spatial and temporal configurations.Accurate prediction and tracking of their spatial morphology are of great significance for locating oil and gas reservoirs and reducing exploration risks.This article applies the geological research results of Baimamiao structure,including tectonics,sedimentation,carrier beds,and source rocks,to construct basic geological models such as hydrocarbon supply models,migration dynamics,and carrier systems at different migration stages.Based on GIS,the geological evaluation results and characterization parameters are converted into numerical models,and probabilistic prediction techniques are used to achieve dynamic tracking of preferential migration pathways for natural gas.The results show that Baimamiao gas reservoir experienced two stages of Yanshanian reservoir formation and Himalayan adjustment.The migration of natural gas can be divided into three processes:vertical migration during the reservoir formation stage,shallow lateral migration during the reservoir formation stage,and lateral migration during the adjustment stage.The application of comprehensive geological research results to construct an initial geological model,dynamic tracking of the dominant migration pathway of natural gas based on GIS,and the application of existing exploration results to verify and analyze the prediction results can provide theoretical and technical support for the optimization and positioning evaluation of trap targets.
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