Fault recognition in a fractured-vuggy reservoir

Abstract

The structure of the strike-slip fault zone in Tarim Basin is complex, with large differences in the activities of main faults, development of branch faults, and distribution of cracks and cavities, resulting in poor identification of the fault zone by the original seismic data. Fractured-vuggy reservoirs are characterized by strong vertical and horizontal heterogeneity, diverse reservoir types, and complex reservoir-controlling factors. In this work, we starts from the design of the seismic forward model, completes the design of multiple sets of seismic models under the guidance of the fractured-vuggy model. We apply amplitude gradient vector disorder, amplitude curvature, gradient structural tensor, and coherent envelope on the seismic data. Based on actual drilling results and seismic data, the spatial distribution characteristics of carbonate fracture-cavity reservoirs under the control of strike-slip faults is established. Using geological model and seismic attribute to study the kinematic and seismic characteristics of fractured-vuggy reservoirs, can establish the relationship between reservoir parameters and seismic attributes that are highly sensitive to reservoir parameters. Finally, multiple seismic attributes, inversion predictions, and pre-stack fracture prediction results are integrated to comprehensively evaluate the vertical and horizontal segmented characteristics of the fractured-vuggy reservoir. Note: This paper was accepted into the Technical Program but was not presented at IMAGE 2021 in Denver, Colorado.