The use of depleted gas fields for CO2 storage as well as CO2-based enhanced gas recovery are of ... more The use of depleted gas fields for CO2 storage as well as CO2-based enhanced gas recovery are of global importance. Thus, the CO2CRC Otway Basin Pilot Project provides important experience in establishing whether such scenarios can be monitored by geophysical techniques, in particular seismic time-lapse methodology.Injection of CO2 into a depleted gas reservoir (with residual gas in the Otway case)
... This paper depends substantially on all the contributions from the CO2CRC team; Don Sherlock,... more ... This paper depends substantially on all the contributions from the CO2CRC team; Don Sherlock, Allison Hennig, Jim Underschultz, Linda Stalker, David Etheridge, Ray Leuning, Tony Siggins and Kevin Dodds of CSIRO, Milovan Urosevic, and Anton Kepic from Curtin University ...
Abstract The CO2CRC Otway Project conducted under the Australian Cooperative Research Centre for ... more Abstract The CO2CRC Otway Project conducted under the Australian Cooperative Research Centre for Greenhouse Gas Technologies is the first of its kind, where CO 2 is injected into a depleted gas reservoir. The use of depleted gas fields for CO 2 storage and or enhanced ...
ABSTRACT CO2CRC Otway Project is the Australia s first demonstration of the deep geological stora... more ABSTRACT CO2CRC Otway Project is the Australia s first demonstration of the deep geological storage of CO2. CO2 has been injected in a depleted gas field at the depth of 2050 m and then will be injected in saline aquifer at the depth of around 1 km. For time lapse studies, we had four different 3D seismic surveys available. Besides of a large 3D seismic volume acquired in the year 2000 prior gas production of the reservoir, three sequential 3D surveys were acquired at the same site but over a smaller area: baseline survey in 2008 and two monitoring surveys in 2009 and 2010. We concentrated on repeatability of 4D seismic data acquisition and processing. This led us to the results which allow to define CO2 location in the reservoir and proves that time-lapse seismic is a valuable tool in CO2 monitoring even in on-shore case.
Time-lapse seismics is the methodology of choice for remotely monitoring changes in oil/gas reser... more Time-lapse seismics is the methodology of choice for remotely monitoring changes in oil/gas reservoir depletion, reservoir stimulation or CO 2 sequestration, due to good sensitivity and resolving power at depths up to several kilometres. This method is now routinely applied offshore, however, the use of time-lapse methodology onshore is relatively rare. The main reason for this is the relatively high cost of commercial seismic acquisition on land. A widespread belief of a relatively poor repeatability of land seismic data prevents rapid growth in the number of land time-lapse surveys. Considering that CO 2 sequestration on land is becoming a necessity, there is a great need to evaluate the feasibility of time-lapse seismics for monitoring. Therefore, an understanding of the factors influencing repeatability of land seismics and evaluating limitations of the method is crucially important for its application in many CO 2 sequestration projects. We analyse several repeated 2D and 3D surveys acquired within the Otway CO 2 sequestration pilot project (operated by the Cooperative Research Centre for Greenhouse Technologies, CO2CRC) in Australia, in order to determine the principal limitations of land time-lapse seismic repeatability and investigate the influence of the main factors affecting it. Our findings are that the intrinsic signal-to-noise ratio (S/N, signal to coherent and background noise levels) and the normalized-root-meansquare (NRMS) difference are controlled by the source strength and source type. However, the post-stack S/N ratio and corresponding NRMS residuals are controlled mainly by the data fold. For very high-fold data, the source strength and source type are less critical.
Understanding the pulsed ecological and hydrological response to infrequent rain events is key to... more Understanding the pulsed ecological and hydrological response to infrequent rain events is key to better designing the rehabilitation of post mining landscapes in arid systems. Here we present the results of two years of heat pulse sap flow, electrical resistivity tomography (ERT) and soil measurements on two hillslope - swale - flat systems in the Great Sandy Desert, Australia. Monitoring
The use of depleted gas fields for CO2 storage as well as CO2-based enhanced gas recovery are of ... more The use of depleted gas fields for CO2 storage as well as CO2-based enhanced gas recovery are of global importance. Thus, the CO2CRC Otway Basin Pilot Project provides important experience in establishing whether such scenarios can be monitored by geophysical techniques, in particular seismic time-lapse methodology.Injection of CO2 into a depleted gas reservoir (with residual gas in the Otway case)
... This paper depends substantially on all the contributions from the CO2CRC team; Don Sherlock,... more ... This paper depends substantially on all the contributions from the CO2CRC team; Don Sherlock, Allison Hennig, Jim Underschultz, Linda Stalker, David Etheridge, Ray Leuning, Tony Siggins and Kevin Dodds of CSIRO, Milovan Urosevic, and Anton Kepic from Curtin University ...
Abstract The CO2CRC Otway Project conducted under the Australian Cooperative Research Centre for ... more Abstract The CO2CRC Otway Project conducted under the Australian Cooperative Research Centre for Greenhouse Gas Technologies is the first of its kind, where CO 2 is injected into a depleted gas reservoir. The use of depleted gas fields for CO 2 storage and or enhanced ...
ABSTRACT CO2CRC Otway Project is the Australia s first demonstration of the deep geological stora... more ABSTRACT CO2CRC Otway Project is the Australia s first demonstration of the deep geological storage of CO2. CO2 has been injected in a depleted gas field at the depth of 2050 m and then will be injected in saline aquifer at the depth of around 1 km. For time lapse studies, we had four different 3D seismic surveys available. Besides of a large 3D seismic volume acquired in the year 2000 prior gas production of the reservoir, three sequential 3D surveys were acquired at the same site but over a smaller area: baseline survey in 2008 and two monitoring surveys in 2009 and 2010. We concentrated on repeatability of 4D seismic data acquisition and processing. This led us to the results which allow to define CO2 location in the reservoir and proves that time-lapse seismic is a valuable tool in CO2 monitoring even in on-shore case.
Time-lapse seismics is the methodology of choice for remotely monitoring changes in oil/gas reser... more Time-lapse seismics is the methodology of choice for remotely monitoring changes in oil/gas reservoir depletion, reservoir stimulation or CO 2 sequestration, due to good sensitivity and resolving power at depths up to several kilometres. This method is now routinely applied offshore, however, the use of time-lapse methodology onshore is relatively rare. The main reason for this is the relatively high cost of commercial seismic acquisition on land. A widespread belief of a relatively poor repeatability of land seismic data prevents rapid growth in the number of land time-lapse surveys. Considering that CO 2 sequestration on land is becoming a necessity, there is a great need to evaluate the feasibility of time-lapse seismics for monitoring. Therefore, an understanding of the factors influencing repeatability of land seismics and evaluating limitations of the method is crucially important for its application in many CO 2 sequestration projects. We analyse several repeated 2D and 3D surveys acquired within the Otway CO 2 sequestration pilot project (operated by the Cooperative Research Centre for Greenhouse Technologies, CO2CRC) in Australia, in order to determine the principal limitations of land time-lapse seismic repeatability and investigate the influence of the main factors affecting it. Our findings are that the intrinsic signal-to-noise ratio (S/N, signal to coherent and background noise levels) and the normalized-root-meansquare (NRMS) difference are controlled by the source strength and source type. However, the post-stack S/N ratio and corresponding NRMS residuals are controlled mainly by the data fold. For very high-fold data, the source strength and source type are less critical.
Understanding the pulsed ecological and hydrological response to infrequent rain events is key to... more Understanding the pulsed ecological and hydrological response to infrequent rain events is key to better designing the rehabilitation of post mining landscapes in arid systems. Here we present the results of two years of heat pulse sap flow, electrical resistivity tomography (ERT) and soil measurements on two hillslope - swale - flat systems in the Great Sandy Desert, Australia. Monitoring
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Papers by A. Kepic