--> ABSTRACT: Integration of Repeat Formation Tester, BottomHole Pressure and Production Data to Assess Reservoir Continuity and Compartmentalization of Deep-Water Gas Sands in the Mississippi Canyon 397 Field, by Allen E. Evans, Burt H. r, Dan R. Fara; #91020 (1995).

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Integration of Repeat Formation Tester, BottomHole Pressure and Production Data to Assess Reservoir Continuity and Compartmentalization of Deep-Water Gas Sands in the Mississippi Canyon 397 Field

Allen E. Evans, Burt H. r, Dan R. Fara

Formation pressures from channelized deep-water sands at Exxon's MC 397 field indicates greater reservoir continuity across the field than originally predicted. In an attempt to better understand deep-water reservoirs and optimize development drilling, open hole RFT's were incorporated as part of the primary logging program.

The main gas reservoir is interpreted as a deep-water channel complex deposited on the lowside of a major counter regional fault. Incision and filling of individual channels resulted in a stacked channel complex with a gross thickness of greater than 400'. Numerous channels are nested within definable larger scale channel packages. The top of this package is sculpted by shale filled channels.

Following initial production startup, open hole RFT pressure data obtained from the next two development wells indicates that all the channels are in some degree of communication. The reservoir continuity is believed to be restricted by areas of low permeability at the base of each channel that creates a pressure "baffle" between the various channels. Each individual channel sampled has a discrete pressure profile, but all the channels were drawndown to less than original.

Presently, reservoir surveillance suggests that pressures in the various channels are converging, seeking an equilibrium reservoir condition. Continued reservoir pressure monitoring will be required to better understand the stratigraphic complexity of this channel complex and the interaction between the various channels.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995