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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The North Shafter and Rose Oil Fields: A Seismically Defined, Diagenetic,
Stratigraphic Trap in the Miocene McLure Shale, San Joaquin Basin, CA
By
1EOG Resources Inc., Denver CO
2ChevronTexaco Inc., Bakersfield, CA
The North Shafter and Rose oil fields, located in the eastern
San Joaquin basin, California, are the most recent discoveries
in the Miocene McLure Shale of the Monterey Formation.
Discovered in 1983, the field was recognized as a potential
oil
producer but was not economic at the time. In 1995, several
attempts at vertical wells proved successful enough to warrant
horizontal drilling. Horizontal drilling along with strategic wellbore
orientation and with new completion and stimulation techniques
have made the program viable.
The McLure Shale is an excellent source rock and has been a prolific reservoir rock in the fractured reservoirs on the west side of the San Joaquin basin. The North Shafter and Rose oil fields are located on the east side of the basin within a very subtle diagenetic trap. The reservoir and trap are the results of silica diagenesis that alter the diatomaceous shales from a non-reservoir opal CT phase to a quartz-phase reservoir rock.
Reservoir characterization has been performed by a number of
methods including extensive core, petrophysical and engineering
analysis. Understanding the rock properties has led to successful
a seismic model that has been used
to delineate the extent of the
reservoir using p-
wave
and converted
wave
2-D seismic data.
The North Shafter and Rose oil fields combine factors that allow diagenesis to occur at the same temperature as hydrocarbon generation. Utilizing seismic data and horizontal drilling technology have been key in the exploitation of this subtle but prolific, unconventional play.
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