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Extending the Southwest Limits of Jonah Field: Using High-quality, 3-D Seismic Data to Improve the Structural Definition
S. G. Siguaw, D. C. Friend
Cabot Oil and Gas Corporation, Denver, Colorado, U.S.A.
The authors thank Cabot Oil and Gas Corporation for permission to publish information disclosed in this chapter. The Yellow Point 3-D survey was acquired by Grant Geophysical, field quality control was provided by Steve Cymbala, 3-D processing was done by Vector Seismic Data Processing, and variance cube processing was performed by Interactive Earth Sciences Corporation. The aeromagnetic survey is owned by Pearson Technologies, Inc., and the aeromagnetic processing and interpretation was done by Image Interpretation Technologies, Inc. in Calgary, Alberta, Canada. Ski Ceigerkansky of Cabot created the graphics displays.
The southwest corner of Jonah field was targeted by Cabot Oil and Gas Corporation for an exploration program to extend the limits of established production. A reprocessed aeromagnetic survey was initially used as a cost-effective method to image this area (the Yellow Point area). However, the aeromagnetic survey did not provide the necessary resolution to convince Cabot to drill a well on their acreage. Subsequently, Cabot acquired a 16.1-mi2 (42-km2) high-resolution, three-dimensional (3-D) survey to evaluate their acreage and define the southwestern intersection of the two faults that form the trap at Jonah field. The Yellow Point area of Jonah field is a region of complex, structural relationships and outstanding gas production. Cabot used the high-quality, 3-D seismic data in combination with available well control and aeromagnetic data to delineate the updip structural limits of Jonah field. Based on this study, a high-risk, high-reward prospect was identified as a southern extension of the Yellow Point area. A wildcat well was drilled on this high-potential prospect with negative results. The wildcat well encountered a normally pressured Lance section outside of the main Jonah fault block.
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