FORWARD LOOKING SEISMICS FROM DRILL-BIT

摘要

Methods and instrumentation for detecting and representing at least one geologic formation in front of an operating drill-bit using the vibration noise generated by the operating drill-bit as a source, comprising at least one receiver array comprising more than one receiver vibration sensor elements, said at least one receiver array are located in one or both of i) at least one receiver well, and ii) submerged in water for sub-sea operation, and beam forming at least one received signal from the signals from said more than one receiver elements of said at least one receiver array, and forming at least one reference signal representing the vibrations of the operating drill-bit, and correlating said at least one received signal with said at least one reference signal with different correlation lags, and forming a seismic representation of the at least one geologic formation in front of the drill-bit through said correlating.