Deconvolution - GSI Vintage Lecture By David Hayes - Septemberr 1979. Deconvolution, like Designature (GSH Movie Time – March 2022) is a wavelet processing technique designed primarily to collapse the long, distorted source wavelet into a sharp pulse so that the resolution of the seismic data can be increased and the variations in the reflections’ character can be stabilized on different traces. * GSI vintage videos courtesy of Schlumberger – WesternGeco

In this lecture we continue the discussion on additive noise attenuation methods. The previous lecture (GSH Movie Time – January 2022) discussed pre-stack methods of velocity filtering for the attenuation of coherent noise. In this lecture we’ll look mainly at the post-stack methods of velocity filtering; but before we get on to that, we’ll look at two other methods that are invariably part of the wavelet processing sequence. These are editing methods and stack itself. Both methods attenuate random and coherent noise. * GSI vintage videos courtesy of Schlumberger – WesternGeco

This is the first of three lectures covering the various methods of deconvolution used by GSI. In this first lecture we will look at the preferred method of deconvolution in the wavelet processing sequence: Designature. It is a pre-stack process which, contrary to conventional deconvolution, creates a single operator per record which is then applied to all the traces i n the record. It effectively collapsing the source wavelet to a zero phase wavelet. * GSI vintage videos courtesy of Schlumberger WesternGeco

This lecture is the first in a series on the topic of Wavelet Processing. Wavelet Processing is a general term for the techniques that attempt to remove the distortions in a seismic trace that mask or alter the wiggles associated to seismic reflections in the earth’s subsurface. The techniques attempt to solve the seismic inverse problem, and most are based on the Convolutional Model of the seismic trace, which is the subject of this first lecture. Courtesy of Schlumberger - Western/Geco

This lecture, called “Velocity Filtering” is the second in a series on the topic of “Wavelet Processing”. Additive noise in a seismic trace is classified as random or organized. Random noise, such as tow noise in the marine environment or surface traffic on land, is not organized, and it would not be duplicated in repeated recordings of the same shot-record. Additive noise such as ground roll and air waves, are organized events that are recorded across the shot record. These events must be removed before compensating for propagation and transmission effects, attenuating multiples, or collapsing the wavelet. Velocity filtering is a technique designed to attack the coherent noise. Courtesy of Schlumberger - Western/Geco

Dolan McDaniel, GSI president in the Mid 80s, goes over GSI’s management philosophy and the impact it had in GSI reaching its business goals. According to Mr. McDaniel: “Equipment and technology are important factors in conducting a seismic survey, but it is people that set GSI apart from its competitors. Since the beginning, GSI recognized the importance of people to its operations, and the importance of teamwork in keeping the company at the top of the seismic industry. As a result, there was an amazing management philosophy at GSI to encourage personal development in each of the employees to give them the opportunity to grow in their jobs and reach their personal potential” Courtesy of Schlumberger - Western/Geco

The May 2021 issue of GSH Movie Time presented the lecture “Processing Overview: Part I”. This month, GSH Movie Time presents the second of the two lectures. The overview goes over the seismic processing of reflection data; that is, processing of the seismic data to produce seismic sections which represent a cross section of the geologic structures in the earth below the seismic line. In the first of these lectures, we looked at the geometric processes which are used to correct for the geometry of the recording system. In this lecture, we look at the signal enhancement processes which are used to remove some of the unwanted noise, including multiple reflections of the seismic wave-field. * GSI vintage videos courtesy of Schlumberger – WesternGeco

This is the first of two lectures which give an overview of the processing of seismic reflection data. In the previous two lectures we went over how seismic energy travels through the earth, how it is reflected from interfaces between different types of rocks, and how these reflections advance and produce other type of events that are recorded on the seismic traces. In this, and a lecture to follow, we will look at how those seismic traces are processed to produce a seismic cross-section which gives a representation of the geologic structures in the earth below the line of seismic data. GSI vintage videos courtesy of Schlumberger – WesternGeco