ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,941, issued on June 3, was assigned to CHINA PETROLEUM & CHEMICAL Corp. (Beijing).

"Methods and apparatuses for seismic characterization of subsurface formations" was invented by Changhua Zhang (Houston), Mingqiu Luo (Houston), Min Zhou (Houston) and Bin Yu (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Method and apparatus for performing a seismic full waveform inversion independent of a source wavelet to generate a final velocity model of subsurface formations of a survey region are provided. The method includes positioning seismic data recording sensors in the survey region; blasting at points of incidence in the survey region to generate...