Strike-slip fault is well-developed in Tarim basin, faults together with karst caves developed along the faults in deeply buried Ordovician carbonate is main reservoir in this area. Accurate prediction of these faults and karst caves is crucial for petroleum exploration. Different seismic attributes are applied to predict multiscale faults and karst caves, large scale faults (>1/4λ) are identified based on seismic discontinuity, while medium scale faults (>1/100λ and <1/4λ) are detected using maximum curvature attribute. Principal Component Analysis (PCA) and unsupervised clustering are utilized to analyze multiple attributes, to categorize the attributes into distinct classes, allowing for the ranking of fault and the subsequent delineation of fracture lineaments. The karst caves are characterized using the maximum amplitude gradient in horizontal direction (MAGH). The study culminates in the characterization of the fault-controlled karst cave reservoirs within the deep Ordovician carbonates by integrating the prediction results.

This content is only available via PDF.
You can access this article if you purchase or spend a download.