Complex Approach to Fault Description While Geosteering for Maximization Reservoir Contact in Horizontal Wells in West Siberia Oilfields

Abstract

The paper presents an interdisciplinary approach to the tectonic dislocations description based on the results of interpretation of seismic data, petrophysical analysis of well-logging data in horizontal wells and the results of inversion of the multifrequency propagation tool. On the materials of seismic surveys and logging-while-drilling data in horizontal wells of one of the oil fields in Western Siberia a cinsistent approach to fault identification and description is presented. Interpretation of seismic data allows predicting the fault presence along the horizontal well profile and gives preliminary estimation of the dipping and amplitude parameters of the fault surface. Utilizing the the logging-while-drilling data of a group of horizontal wells with the aim to improvement the geological model after fault crossing an approach including machine learning principles is proposed and tested. Application of inversion of the multifrequency propagation tool to one of the updated geological model with faults allowed to improve the estimations of the fault zone parameters.