A Handbook for Seismic Data Acquisition in Exploration


Book Description

This illustration-rich book explains seismic data acquisition operations from a fundamental and practical standpoint, ranging from land to marine 2D methods to 3D seismic methods. Helpful to geologists, field crews, exploration managers, petroleum engineers, and geophysicists, each chapter concludes with exercises on field data recording problems.










Acquisition and Processing of Marine Seismic Data


Book Description

Acquisition and Processing of Marine Seismic Data demonstrates the main principles, required equipment, and suitable selection of parameters in 2D/3D marine seismic data acquisition, as well as theoretical principles of 2D marine seismic data processing and their practical implications. Featuring detailed datasets and examples, the book helps to relate theoretical background to real seismic data. This reference also contains important QC analysis methods and results both for data acquisition and marine seismic data processing. Acquisition and Processing of Marine Seismic Data is a valuable tool for researchers and students in geophysics, marine seismics, and seismic data, as well as for oil and gas exploration. Contains simple step-by-step diagrams of the methodology used in the processing of seismic data to demonstrate the theory behind the applications Combines theory and practice, including extensive noise, QC, and velocity analyses, as well as examples for beginners in the seismic operations market Includes simple illustrations to provide to the audience an easy understanding of the theoretical background Contains enhanced field data examples and applications




Seismic Data Analysis Techniques in Hydrocarbon Exploration


Book Description

Seismic Data Analysis Techniques in Hydrocarbon Exploration explains the fundamental concepts and skills used to acquire seismic data in the oil industry and the step-by-step techniques necessary to extract the sections that trap hydrocarbons as well as seismic data interpretation skills. It enhances the ability to interpret seismic data and use that data for basin evaluation, structural modeling of a fault, reservoir characterization, rock physics analysis, field development, and production studies. Understanding and interpreting seismic data is critical to oil and gas exploration companies. Arming young geoscientists with a reference that covers the key principles of seismic data analysis will enhance their job knowledge, skills and performance. A fundamental grasp of seismic data enhances employability and aids scientists in functioning effectively when working with seismic data in industry. Edited by a team of petroleum geoscientists with more than 30 years of experience in hydrocarbon exploration and data analysis at O&G companies. More than 200 figures, photographs, and illustrations aid in the understanding of the fundamental concepts and techniques used to acquire seismic data Takes an easy-to-follow, step-by-step approach to presenting the techniques and skills used to extract the geologic sections from acquired seismic data. Enhances the geoscientist’s effectiveness when using seismic data for field development and other exploration and production studies




Birddog


Book Description

This book describes the methods and attributes required for the compe tent quality control of the data acquisition of a seismic exploration crew operating on land. Although the book is concerned mainly with explo ration for oil and gas reservoirs, and all the topics that are discussed in it are centred on that target, the material is applicable to other areas of seismic exploration such as civil engineering and the search for other minerals. The book comprises the distillation of more than thirty years' experience in geophysical exploration in all its aspects and in many parts of the world. Seismic data acquisition quality supervision is one aspect of geophysical exploration which, although of great importance, has had, so far as the writer is aware, no textbook devoted to it. It is hoped that it will be of interest to anyone who is engaged, in whatever capacity, in geophysical exploration and will help them to attain their goal, which is illustrated in Fig. 1. 1. The term birddog is colloquial in the geophysical exploration industry. It is a convenient shorthand title to describe the person whose full title is, and who acts as, the data acquisition quality control supervisor on a field seismic exploration crew. The term is used also to describe the person who is the client's representative on the field crew. In practice the same person performs both functions on behalf of the client.




A Guide to Seismic Data Acquisition


Book Description

This book deals with the optimization technique of seismic data acquisition parameter. Each aspect of acquisition parameter has been discussed in detail. Chapter-one deals with the general technique of seismic data acquisition and common meaning of some of the terms being used in exploration seismic in on land and offshore areas, particularly about characteristics of source & receiver and acquisition techniques. Chapter-two deals with the optimization of Geometrical Parameters i.e. far-offset distance, near-offset distance, group interval, effective array length, foldage, line orientation and line length. Chapter-three deals with the optimization of Source Parameters. Basic goal of optimization is to have required resolution and signal to noise ratio in the acquired data. For explosive source, shot hole depth, charge size and lithology of the medium surrounding the charge are three parameters which decide the source signature. First of all records with different depths below the weathering layer with equal charge size is taken. Signal to noise ratio and peak frequency of the signal at the main zone of interest is computed. Amplitude spectra of different traces at main zone of interest are also compared for all the records. Record giving highest peak frequency and signal to noise ratio corresponds to optimum depth. Now keeping this depth fixed, charge size is varied and record are taken. Again signal to noise ratio, peak frequency and amplitude spectra are compared and a suitable one is selected on the basis of frequency content and signal to noise ratio. In the case of land airgun, Number of airgun, number of pops and air gun patterns are the main parameters, which decide signal to noise ratio. In the case of Vibroseis, sweep length, end frequencies of the sweep and Vibroseis pattern are the main parameters to be optimized in the field. In marine work marine air gun is the widely used marine seismic source. Peak to peak amplitude, primary to bubble ratio (PBR) and bandwidth of the amplitude spectrum are the deciding parameters for selection of source.Chapter-four deals with the Source/Receiver Array Parameters. Effective array length, element's weighting and spacing are the parameters to be optimized on the basis of desired seismic resolution as well as degree of attenuation of coherent noise. Effectiveness of the array is examined by fold-back experiment and f-k diagram.Chapter-five deals with the Recording System & Quality Control. Silent features have been discussed here, which are essential to be adhered in the field so that objective of the survey is achieved.




Simultaneous Source Seismic Acquisition


Book Description

This book introduces simultaneous source technology and helps those who practice it succeed. Although the book does not include all developments, which would have en­tailed a much longer treatise, this work is written through the lens of decades of experiences and allows readers to understand the development of independent simultaneous sourcing. The relationships between data acquisition and data processing are discussed because never before have they been so intertwined as in this area. In addition to describing the underlying technologies, this book also is a user-guide which discusses survey design and acquisition and decribes the sensitivities of the processing algorithms which can allow simultaneous source technology to succeed. The audience for this book includes acquisition and pro­cessing geophysicists who will work with these data as well as those who require only an overview of the state of the art; and, even though they may not need the full technical details, they may want to know the limitations and advantages of using simultaneous sources.




Coding and Decoding: Seismic Data


Book Description

Currently, the acquisition of seismic surveys is performed as a sequential operation in which shots are computed separately, one after the other. This approach is similar to that of multiple-access technology, which is widely used in cellular communications to allow several subscribers to share the same telephone line. The cost of performing various shots simultaneously is almost identical to that of one shot; thus, the savings in time and money expected from using the multishooting approach for computing seismic surveys compared to the current approach are enormous. By using this approach, the long-standing problem of simulating a three-dimensional seismic survey can be reduced to a matter of weeks and not years, as is currently the case. Investigates how to collect, stimulate, and process multishooting data Addresses the improvements in seismic characterization and resolution one can expect from multishooting data Aims to educate the oil and gas exploration and production business of the benefits of multishooting data, and to influence their day-to-day surveying techniques




Active Geophysical Monitoring


Book Description

Active geophysical monitoring is an important new method for studying time-evolving structures and states in the tectonically active Earth's lithosphere. It is based on repeated time-lapse observations and interpretation of rock-induced changes in geophysical fields periodically excited by controlled sources. In this book, the results of strategic systematic development and the application of new technologies for active geophysical monitoring are presented. The authors demonstrate that active monitoring may drastically change solid Earth geophysics, through the acquisition of substantially new information, based on high accuracy and real-time observations. Active monitoring also provides new means for disaster mitigation, in conjunction with substantial international and interdisciplinary cooperation. Introduction of a new concept Most experienced authors in the field Comprehensiveness