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Many significant advances in horizontal drilling and production technology have occurred during the past decade. Although horizontal wells still comprise a small fraction of the total number of wells drilled annually at Midway-Sunset field, their number has been steadily increasing as more companies find specific production opportunities where this technology can be economically applied.

In 1991 and 1993 two seismic surveys were acquired across and in the vicinity of the Midway-Sunset Oil Field. High quality imaging has been difficult to obtain due to noise from the thousands of pumping wells, and steamflood operations associated with the field. Complex subsurface structure has also contributed to the problem.

This paper discusses the acquisition and processing history of these surveys and the numerous methods applied to analyze and to reduce the effects of "production" noise. Also, discussed is the application of a mini-3D processing technique on one test line. This technique has provided results indicating that imaging quality of a 3D survey may be substantially su- perior to that of comparable 2D data.

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