Abstract

The oil and gas industry is continuing to emphasize research and development efforts on advanced technology to improve reservoir description through the producing life and development history of hydrocarbon reservoirs. Continuity logging, an alternative approach to multiple offsets crosswell seismic, can analyze guided waves propagating parallel to the layering for bed connectivity in heterogeneous geologic formations; in particular, the continuity of sand and shale stratigraphy. The present work includes a study of rock physical properties and seismic data for reservoir continuity using interwell logging techniques. Processing methods are used to delineate the reservoir boundaries and to related seismic waves with rock physical parameters. The principal application of this study is to identify and analyze the propagation characteristics of guided waves in the Gypsy-fluvial sandstone formation at the Gypsy test site in Oklahoma. The integration of well logs and interwell seismic data using trapped seismic events suggested the presence of a low-velocity clean sand to be connected in the Gypsy sandstone interval. The correlation of sand and shale stratigraphy with well logs and guided waves is consistent with crosswell connectivity mapping and pulse test data. The pulse tests indicated that the sands are in pressure communication between the wells and suggest the existence of an impermeable barrier between the top and bottom of the sand units in the Gypsy sandstone reservoir.