Methods of hydrocarbon detection using spectra dominant frequency and measures of energy decay on the low side and high side of spectra dominant frequency

摘要

A method for detecting hydrocarbons including obtaining seismic trace data for a region of interest; processing, using a processor, the seismic trace data to calculate a signal spectrum for each of a plurality of locations in the region of interest; calculating a dominant frequency of the signal spectrum; calculating at least one measure of energy decay above the dominant frequency, calculating at least one measure of energy decay below the dominant frequency, and calculating at least one measure spectral shape of the signal spectrum, and locating a hydrocarbon reservoir in the region of interest using the at least one measure of energy decay below the dominant frequency, the at least one measure of energy decay above dominant frequency and the dominant frequency; or locating a hydrocarbon reservoir in the region of interest using the at least one measure of energy decay below the dominant frequency and the at least one measure of energy decay above dominant frequency; or and locating a hydrocarbon reservoir in the region of interest using the at least one measure of energy decay below the dominant frequency and the dominant frequency; or locating a hydrocarbon reservoir in the region of interest using the at least one measure of spectral shape and the dominant frequency.

主权项

1. A method for detecting hydrocarbons, comprising a hydrocarbon detection system for operation including a processor to execute a hydrocarbon detection program stored in a memory for:
providing seismic waves via at least one seismic source; receiving the seismic waves via at least one receiver as raw seismic data; acquiring raw seismic data from the at least one receiver; converting seismic trace data for a region of interest from the raw seismic data using the hydrocarbon detection system; processing the seismic trace data to calculate at least one spectrum for at least one sample from the seismic data; calculating at least one dominant frequency (ωD) for the at least one spectrum, wherein ωD is the frequency at which the largest amplitude In the spectrum occurs; calculating at least one measure of energy decay at frequencies above the at least one ωD (high side energy decay) on the at least one spectrum; calculating at least one measure of energy decay at frequencies below the at least one ωD (low side energy decay) for the at least one spectrum; locating a hydrocarbon reservoir in the region of interest using the at least one ωD and the at least one measure of energy decay at frequencies below the at least one dominant frequency and the at least one measure of energy decay at frequencies above the at least one ωD; and outputting an indication of the presence of the hydrocarbons from the hydrocarbon detection system to a display or storage.