Spatial positioning for fracture-cavity bodies based on frequency-segmented scale constraints
Predicting the scale and determining the position of Ordovician carbonate fracture-cavity bodies in the Tarim Basin is very challenging,which affects the target design and the implementation of fracturing for oil and gas exploration.This paper proposes a method for the spatial positioning of fracture-cavity bodies based on fre-quency-segmented scale constraints,which effectively improves prediction accuracy.Firstly,based on the seis-mic data volumes of pre-stack frequency segmentation,this paper determines the tuning frequency of fracture-cavity bodies by the Gauss function to obtain scale parameters.Then the scale parameters are used to scan the threshold of the impedance curve of central fracture-cavity bodies.When the time thickness of the curve with low impedance matches the scale parameters,the constraints and calibration of the impedance threshold are completed,thereby achieving scale prediction and spatial positioning.The reliability and accuracy of the pro-posed method are verified through forward modeling.Practical applications show that the prediction results can better describe the scale features and spatial positions of fracture-cavity bodies,and provide a clearer relation-ship between well paths and fracture-cavity bodies.This method provides effective support for fracturing plans and oil and gas exploration.
fracture-cavity bodyforward modelingpre-stack frequency segmentationscale predictionquantita-tive inversionoptimal target selection