Applying microtremor analysis to identify hydrocarbon reservoirs
Published in
First Break
Publication date
23 May 2005
Abstract
A new tool to identify and delineate hydrocarbon-bearing geological structures by analyzing low frequency seismic signals has been developed by Spectraseis. It provides a direct hydrocarbon indicator for the optimization of borehole placement during exploration, appraisal and production. Hydrocarbon Microtremor Analysis
(HyMAS) exploits the selective absorption and hydrocarbon-induced amplification of low frequency seismic background noise. In contrast to conventional 2D and 3Dseismic technologies, HyMAS is entirely passive and does not require artificial seismic excitation sources. Instead, the ever-present seismic background noise of the earth acts as the driving force for the generation of hydrocarbon indicating signals. The seismic background noise spectrum is modified in a different way when interacting with geological structures containing hydrocarbon filled pores compared with interaction with similar structures not containing hydrocarbons. Results from a survey in Brazil have demonstrated that the analysis of low frequency seismic signals can yield consistent, accurate information for areas of high and low hydrocarbon potential. Used by themselves or integrated with other geophysical or geological information, these data can be used to high-grade areas for conventional seismic programs or drilling.
(HyMAS) exploits the selective absorption and hydrocarbon-induced amplification of low frequency seismic background noise. In contrast to conventional 2D and 3Dseismic technologies, HyMAS is entirely passive and does not require artificial seismic excitation sources. Instead, the ever-present seismic background noise of the earth acts as the driving force for the generation of hydrocarbon indicating signals. The seismic background noise spectrum is modified in a different way when interacting with geological structures containing hydrocarbon filled pores compared with interaction with similar structures not containing hydrocarbons. Results from a survey in Brazil have demonstrated that the analysis of low frequency seismic signals can yield consistent, accurate information for areas of high and low hydrocarbon potential. Used by themselves or integrated with other geophysical or geological information, these data can be used to high-grade areas for conventional seismic programs or drilling.