Method and apparatus for source wavelet estimation

A method for estimating source wavelet for seismic survey, comprising:

• (a) positioning seismic data recording sensors a plurality of locations in the survey region and positioning a well logging tool comprising a sonic generator and one or more well log recording sensors in a well bore in the survey region;
• (b) emitting at points of incidence in the survey region to generate seismic waves, which travel through subsurface earth formations;
• (c) observing the seismic waves and recording seismic data based on the seismic waves using the seismic data recording sensors;
• (d) conducting well logging operation using the well logging tool and recording well log data using the one or more well log recording sensors;
• (e) transmitting the seismic data from the seismic data recording sensors and the well log data from the one or more well log recording sensors to a computer system including one or more memories and storing the seismic data and the well log data in the one or more memories;
• (f) performing, by the computer system, time migration to the seismic data to obtain observed data;
• (g) processing, by the computer system, the well log data to obtain one or more earth models that represent one or more formation properties;
• (h) performing, by the computer system, reflectivity modeling and time migration to obtain a reflectivity;
• (i) convoluting, by the computer system, a band pass filter with the reflectivity to produce a band-limited reflectivity;
• (j) cross-correlating, by the computer system, the band-limited reflectivity with the observed data to obtain a weight;
• and
• (k) performing, by the computer system, inversion to obtain a source wavelet based on the weight, the reflectivity, and the observed data, and least-squares regression to minimize a difference between the observed data and the band-limited reflectivity.