Title:

A Study on the Production and Reservoir Performance of Omer-Gecek/Afyon Geothermal Field

Authors:

Satman, A., Onur, M., Serpen, U., Aksoy, N.

Key Words:

Omer-Gecek Field, Production and Reservoir Performance

Geo Location:

Afyon, Turkey

Conference:

Stanford Geothermal Workshop

Year:

2007

Session:

Field Studies

Language:

English

File Size:

465KB

View File:

Abstract:

The Omer-Gecek geothermal field is situated about 15 km northwest of Afyon city in the Central Aegean Region of Turkey. It is a liquid dominated reservoir. At Omer-Gecek, there are 30 wells with depths from 56.8 to 902 m. The geothermal water produced with a maximum temperature of 111.6 oC has been utilized to support a district heating system with a capacity of approximately 4500 residences since 1996. The reservoir water has a dissolved CO2 content of 0.4% by weight. The maximum discharge rate is close to 236 kg/s.

In this study, the results of temperature profiles, well tests, pumping tests, well logging surveys and chemical analysis to determine the rock and fluid properties and as well as to characterize the Omer-Gecek geothermal reservoir are evaluated and presented. Based on static temperature measurements obtained from the wells throughout the field, a 3-D temperature distribution map was constructed. The reservoir limits are studied and the volume of water in place and stored heat are estimated by various methods. About 50% of the produced fluid by AFJET, the district heating system company, has been reinjected into the reservoir without any cooling and injectivity problems so far.

Our in-house lumped parameter model was utilized to model the production rate-reservoir pressure history and an almost perfect match was obtained. Results of the proper model obtained from the match were used to estimate the production performance of the field under several production scenarios.


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