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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 5. (May)

First Page: 759

Last Page: 759

Title: Study of Diagenetic Processes in Previous HitSandstoneNext Hit from Cerro Prieto Geothermal Field, Baja California, Mexico: ABSTRACT

Author(s): John E. Noble, Stephen Van Der Har

Article Type: Meeting abstract

Abstract:

The economic exploitation of a geothermal resource is dependent on an adequate reservoir Previous HitporosityNext Hit and Previous HitpermeabilityNext Hit and awareness of the distribution of each during development. Exploitable reservoir Previous HitporosityNext Hit and Previous HitpermeabilityNext Hit are the results of diagenetic alteration of the reservoir's original Previous HitporosityNext Hit.

In this study, we have used petrographic, SEM, and X-ray diffraction analysis of well-bore cutting and core to model the diagenetic processes evident in the Cerro Prieto geothermal field. Previous HitPorosityNext Hit distribution was matched with lithologic and hydrothermal alteration distribution and a composite distribution model was constructed. This model was then analyzed for Previous HitporosityNext Hit trends.

The ratio of fracture to dissolution Previous HitporosityNext Hit and the ratio of detrital dissolution secondary Previous HitporosityNext Hit to authigenic dissolution secondary Previous HitporosityNext Hit were critical to this study. The role of fracture-dominated Previous HitporosityNext Hit and authigenic mineral plugging may have been overstated in geothermal system development.

The role of diagenetic studies in any reservoir evaluation is paramount. Diagenetic processes determine Previous HitporosityNext Hit from its origins through to distribution of Previous HitporosityNext Hit and Previous HitpermeabilityNext Hit. Studies of these processes will contribute to better Previous HitpredictionNext Hit of reservoir Previous HitporosityTop distribution and subsequently better management of the geothermal resource.

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