Maps of any attribute analysis in the area are presented, as well as seismic crosssections to demonstrate the trap and the salient points of the interpretation. What is the relationship of the burial history to the rock physics. Esanda engineering seismic interpretation and petroleum. It shows how to build earth models pseudowells using deterministic and statistical approaches, and includes case studies based on real well data. Seismic towell tie, horizon interpretation, velocity modeling, depth conversion, and dhi analysis and interpretation. Although first introduced to the seismic community in the 1970s, only a limited number of published papers show the value of this attribute. To be effective, it is necessary to teach geologists and engineers a bit of geophysics, and geophysicists and engineers a bit of.
Zero phased prestack depth migration seismic psdm with 180o polarity was the input reflectivity volume for spectral decomposition process. The blueoverred amplitude represents a poor prospect. Relating seismic interpretation to reserveresource. A seismic interpretation study should access the following data sets. Types of dhi are bright spots, flat spots, dim spots, polarity reversals, avo, frequency changes, etc.
Request pdf direct hydrocarbon indicators dhi the presence of gas in highly. The topics it covers include basic structural interpretation. Dhis are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells. The authors provide an integrated methodology and practical tools for quantitative interpretation, uncertainty assessment, and characterization of subsurface reservoirs using welllog and seismic data. Dhi interpretation and prospect risking course 2 days. The seismic wavelet starts as the pulse of seismic energy, which, generated by the energy source, travels down through the earth, is reflected and travels back up to the surface receivers carrying the geological information with it. Interpretation of dhi characteristics with machine. Seismic american association of petroleum geologists. Seismic interpretation is the thoughtful procedure of separating these effects. Aug 01, 2017 seismic interpretation of dhi characteristics with machine learning. Seismic data interpretation and evaluation for hydrocarbon. Formerly, a book, now available on cdrom, this title was written to be an introduction to the geologic interpretation of seismic data. As a photographer and writer, he said, speaking directly about the award, i have tried to share and preserve that beauty through my work within science outreach.
Issues in rock physics and implications for dhi interpretation. Relieve interpreters from tedious and repetitive activities so they can spend more time evaluating plays and validating findings. Interpretation of seismic data is the primary concern of geophysicists. In addition to providing excellent structural images, the dense sampling of a 3d survey makes it possible to map reservoir quality and the distribution of oil and gas. Dhi index delta pg the component of the final pg that is due to the presence of dhi characteristics weighted by the data quality. Direct hydrocarbon indicators dhis are an anomalous type of seismic amplitude that may occur due to the presence of hydrocarbons. Sosn06b 2d t32p seismic interpretation report 1 introduction the sosn06b 2d seismic survey was acquired by santos in 2006 as part of the work commitment for the permit year 4. Extract the best possible interpretation analysis from your seismic data. The presentation is a part from seismic data interpretation course that i teach for undergraduates. Introduction to the methods of acquisition and processing of seismic reflection data. Seismic interpretation an overview sciencedirect topics. This is concerned with study of wave shape, polarity, continuity, dip, frequency, phase, and amplitude.
This book introduces readers to the field of seismic data interpretation and. Dhi on seismic data can have a significant impact on the reserveresource calculations not only for volumes, but also uncertainty levels. Use features like bookmarks, note taking and highlighting while reading 3d seismic interpretation. Interpretation of threedimensional seismic data is the definitive, and now classic, text on the subject. It is rare that the correctness or incorrectness of an interpretation can be ascertained, because the actual geology is rarely known in enough detail. A reflectivity from the top of a clean, highporosity wet sand. A hydrocarbon indicator hci or direct hydrocarbon indicator dhi, is an anomalous seismic. The book was written by and for seismic interpreters who have experience in academia and the petroleum industry.
A hydrocarbon indicator hci or direct hydrocarbon indicator dhi, is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir. Even with the use of advanced seismic technology and wellequipped interpretation workstations, the interpretation of dhi characteristics is not always easy or straightforward. Seismic attributes in hydrocarbon reservoirs detection and. Seismic interpretation and petroleum geology course overview. This article discusses a basic threestep methodology, which, when followed, provides for a more complete and accurate geological interpretation from seismic data. A major uncertainty in the interpretation and risk analysis of seismic amplitude anomalies is the presence of a pitfall.
Acquisition was completed in june 2006, using the pacific titan seismic vessel. Aug 21, 2003 3d seismic data have become the key tool used in the petroleum industry to understand the subsurface. This is arguably one of the most helpful handbooks on seismic amplitude interpretation published to date. The course provides the fundamental knowledge necessary for a correct seismic interpretation, using practice techniques and dataset to interpret real case study of different geodynamics context from around the globe, onshore and offshore. Structural and isochronisopach map creation in time and depth, amplitudeattributeextraction map creation with structural contours. This is a used book in good condition and may show some signs of use or wear. Niranjan c nanda this book introduces readers to the field of seismic data interpretation and evaluation, covering themes such as petroleum exploration and high resolution seismic data. Conceived in 1979 and first published in 1986, the book helps geoscientists extract more information from their seismic data and improve the quality of their interpretations james d. Well data are gotten from rock samples and measurements at depth from a wellbore. Direct hydrocarbon indicators dhi linkedin slideshare. Dhi interpretation and prospect risking course 2 days this course explores the theory and methodology of seismic direct hydrocarbon detection interpretation dhi including discussion of the various techniques, their strengths, weaknesses and pitfalls. This book introduces readers to the field of seismic data. In the process of quantifying resourcesreserves, geoscientists attempt to employ all the available pertinent information to produce the most accurate results. The august 2016 issue of interpretation features special sections on nearsurface imaging and interpretation, ambient noise, seismic facies classification and modeling, building complex and realistic geological models from sparse data, detection of hydrocarbons, and the south china sea deepwater.
Quantitative seismic interpretation stanford rock physics. The interpreters confidence level that the seismic anomaly is. Seismic interpretation of dhi characteristics with machine learning. M42 interpretation of threedimensional seismic data. Seismictowell tie, horizon interpretation, velocity modeling, depth conversion, and dhi analysis and interpretation. Both have a dramatic impact on the rock physics properties of not only the reservoir, but also the source and seals. This would be a great textbook for an introduction to seismic interpretation course that focuses on the geology side, or a great reference manual for geoscientists or perhaps even engineers who are working with seismic data probably in the petroleum industry, but also in academia, or the environmental industry. Dhi analysis using seismic frequency attribute on fieldan niger delta, nigeria yaqub o. The results of well logs and integrated seismic interpretation allowed to obtain the complete picture. I have always been seduced by the beauty of geology and landscape.
This book introduces geophysicists and geologists to the technique of interpreting 3d seismic data. Topics covered in this book include basic structural interpretation and mapmaking. Basic theory of seismic waves traveling through the earth and how they interact with earth materials and interfaces. Welcome to an interview with per avseth, who discusses rock physics and quantitative seismic interpretation. The application of the seismic technique to petroleum exploration has evolved well beyond its original emphasis on imaging of subsurface structure. Processing was undertaken by fugro seismic imaging pty ltd and was completed in.
The accurate interpretation of dhi characteristics has proven to significantly improve the success rates of drilling. This lesson defines and describes the steps utilized in seismic interpretation. In 2001 a consortium of oil companies was organized in an attempt to understand. This book commences with a discussion of the elementary theory of seismic waves and their behaviour, and continues with a detailed survey of the various methods and techniques used for the acquisition and processing of data.
Seismic interpretation, whether for hydrocarbon exploration or geotechnical studies, is the determination of the geological significance of seismic data. Well data required for interpretation are wireline logs gamma ray logs, resistivity logs, porosity log, sonic logs, density logs and neutron logs or equivalent rock property model, check shot data. Seismic interpretation better tools, better understanding, in less time. The narrow bands of low coherency values that extend across this time slice are created by. Brief summary of seismic acquisition and processing.
Dhi analysis using seismic frequency attribute on fieldan. Seismic interpretation is an art or a skill that is acquired with experience, which i happened to attain. The book catalogs various cases, including clastic sediments, carbonates, and timelapse seismic monitoring, and discusses the effect of attenuation on seismic reflections. This book introduces geophysicists and geologists to the techni.
The presence of direct hydrocarbon indicators dhi on seismic data can have a significant impact on the reserveresource calculations not only for volumes, but also uncertainty levels. The lesson uses the basics seismic reflection principles, and allows the student to apply them to interpret a geologic framework, conduct a data analysis, prospect for hydrocarbons, and then assess whether the basin should be bid on and provide an economic analysis. Seismic attribute analysis provides information related to structure, stratigraphy, and reservoir properties. In this column, we show the value of bandwidth when applied to data from the utica area of eastern ohio, united states and from the gulf of mexico. Seismic interpretation and petroleum geology esanda engineering. Seismic interpretation in petroleum exploration springerlink.
Part of the springerbriefs in earth sciences book series briefsearth abstract. This could be done for 3d as well, and was for the earliest surveys. Relating seismic interpretation to reserveresource calculations. With their knowledge and application, the students should be able to generate a geologica framework. Combine potent interpretation power with exciting visualization and pointandclick convenience. Direct hydrocarbon indicators dhi request pdf researchgate. The quality of the color figures are outstanding and are key when interpreting seismic attributes and in highlighting. Confidence in the accuracy of dhi identification can be increased by modelling 2 summary of hydrocarbon indicators after brown 1991 interpretation of 3d seismic data aapg memoir 42 i structural crest of against a fault trapping location ii local increase in amplitude bright spot. After the students have learned about these different steps in detail, they then apply this knowledge to an exercise. All modern seismic interpretation software can perform the numerical transform that converts 3d seismic wiggletrace data into a 3d coherency volume. Dhi, their successful implementations and limitations. Seismic data interpretation and evaluation for hydrocarbon exploration and production. The emerson seismic interpretation suite is an integrated, modern interpretation and visualization system designed to carry out all seismic interpretation tasks, including structural, stratigraphic, and volume interpretation. Seismic and well data as well as computer applications utilized for subsurface data interpretation were supplied and approved by spdc limited, port harcourt.
Direct hydrocarbon indicators dhi, hcis, bright spots, or dimouts are elements employed in this lithologic interpretation process. Quantitative seismic interpretation based on prestack seismic data, such as amplitude variation with offset avo analysis, allowing the extraction of geological features with greater accuracy. Basics of seismic interpretation incorporated research. The third and final stage of the hierarchy of seismic interpretation is seismic attribute analysis taner and sheriff, 1977.
This book introduces readers to the field of seismic data interpretation and evaluation, covering themes such as petroleum exploration and high resolution seismic data. Jun 09, 2015 seismic data interpretation 209 pitfalls in seismic interpretation dhi seismic section with dry hole and good well penetrate high amplitudes, but only the latter with redover blue troughoverpeak is representative of low impedance prospective sand. A key technology employed in evaluating potential dhi features is seismic attributes. Recapitulation of fundamentals that are of direct relevance for seismic interpretation, such as reflection coefficients, polarity convention and the like. They illustrate the advantages of these new methodologies, while providing advice about limitations of the methods and traditional pitfalls. A seismic interpretation study should access the following data sets 2d or 3d seismic data cube. Seismic interpretation of dhi characteristics with machine. The relationship between acquisition, processing, and interpretation of seismic data is discussed here, since these three processes interrelate and complement each other. Seismic interpreters can be geologists, geophysicists, and even engineers.
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