Methods and apparatus for geophysical exploration via joint inversion

A system for creating a velocity model for pre-stack depth migration, the system comprising:

• means for creating initial joint inversion input data comprising seismic, gravity and electromagnetic data;
• means for jointly inverting the initial joint inversion input data to create a multiparametric model that comprises velocity, density and resistivity parameter distributions;
• means for extracting velocity parameters, density parameters and resistivity parameters from the multiparametric model to form an extracted velocity model, an extracted density model, and an extracted resistivity model, respectively;
• means for calculating a seismic image using the extracted velocity model;
• means for determining if the calculated seismic image satisfies a predetermined quality criterion;
• and
• means for outputting the extracted velocity model as the velocity model if the predetermined quality criterion is satisfied.

A system for creating a velocity model for pre-stack depth migration, the system comprising a computer including a processor and a memory device storing a set of machine readable instructions executable by the processor to:

• create initial joint inversion input data comprising seismic, gravity and electromagnetic data;
• jointly invert the initial joint inversion input data to create a multiparametric model that comprises velocity, density and resistivity parameter distributions;
• extract velocity parameters, density parameters and resistivity parameters from the multiparametric model to form an extracted velocity model, an extracted density model, and an extracted resistivity model, respectively;
• calculate a seismic image using the extracted velocity model;
• determine if the calculated seismic image satisfies a predetermined quality criterion;
• and
• output the extracted velocity model as the velocity model if the predetermined quality criterion is satisfied.

A computer program product for creating a velocity model for pre-stack depth migration, the computer program product comprising a non-transitory computer readable storage media storing machine readable instructions, wherein the instructions are executable by a computer to:

• create initial joint inversion input data comprising seismic, gravity and electromagnetic data;
• jointly invert the initial joint inversion input data to create a multiparametric model that comprises velocity, density and resistivity parameter distributions;
• extract velocity parameters, density parameters and resistivity parameters from the multiparametric model to form an extracted velocity model, an extracted density model, and an extracted resistivity model, respectively;
• calculate a seismic image using the extracted velocity model;
• determine if the calculated seismic image satisfies a predetermined quality criterion;
• and
• output the extracted velocity model as the velocity model if the predetermined quality criterion is satisfied.