Seismic data processing geos 469569 spring 2006 assumes knowledge of basic seismic reflection techniques and knowledge of trigonometry and calculus we will use complex numbers and some of the ideas of complex analysis as tools, but will develop these. Separating out timedepositional units based on detecting unconformities or changes in seismic patterns analysis of seismic. Seismic stratigraphic and quantitative interpretation of. Since the introduction of digital recording, a routine sequence in seismic data processing has evolved. The analysis used an original digital workflow for seismicsequence stratigraphic interpretation. This process is a timeconsuming and tedious task that involves identification of individual boundaries on 2d seismic profiles and their correlation with each other to produce 3d sequence models. Although the knowledge and technology of performancebased earthquake engineering have rapidly advanced in the past several decades, current seismic design codes simply ignore the effect of aftershocks on the performance of structures. Seismic reflection terminations and configurations are interpreted as stratification patterns, and are used for recognition and correlation of depositional sequences, interpretation of depositional environment, and estimation of lithofacies. Seismic stratigraphy is a powerful tool for exploration and exploitation, especially when the rockfluid information within the seismic wavelet reflection character analysis is integrated with the lithofaciesstratigraphic information, which is determined from reflection group geometry sequence analysis. Key to the analysis is discovering the linear, and often nonlinear, relationships between the seismic trace and.
The fact that unconformities are usually good reflectors is important because the mapping of unconformities is the key to seismic sequence analysis. Seismic stratigraphy an overview sciencedirect topics. Sequence stratigraphy, seismic stratigraphy, and seismic structures of the lower intermediate confining unit and most of the floridan aquifer system, broward county, florida. Introduction to seismic stratigraphy training course. The aim of this paper is to analyze this thick stratigraphic succession using sequence stratigraphy, seismic attributes in order to create.
Seismic attribute analysis can extract information from seismic data that is, otherwise, hidden in the data and have been used to identify prospects, ascertain depositional environments. The seismic analysis by sacs requires a combined gravity and seismic load, performed by a combination module, as shown in figure 8. Gale1 1bureau of economic geology, jackson school of geosciences, the university of texas at austin, austin, texas, usa abstract an earthquake sequence that culminated in a m w4. Pdf the approaches to seismic analysis of buildings. Seismic attribute analysis over the past three decade, we have witnessed new applications of seismic attributes in seismic processing, reflector mapping, fault identification, bright spot identification, frequency loss, thin bed tuning, seismic stratigraphy and geomorphology. The objective of seismic sequence analysis is to identify depositional sequences and systems tracts on seismic sections by interpreting the location of their boundaries. Estimate sequences and systems tracts from the interpreted lithofacies using regional cross sections with well and outcrop data determine accommodation space changes from. An integrated seismic sequence stratigraphy and facies analysis has been carried out with a view to understanding the depositional environment and stratal stacking pattern of nandy field of niger delta. Ultimately, it can be used to predict and discover more hydrocarbon plays, to improve the estimation of play and prospect risk and to determine. Seismic attributes are the components of the seismic data, which are obtained by measurement, computation, and other methods from the seismic data.
The basement surface, that is an erosional truncation in some places, indicates that a hiatus probably occurred during messinian to. The list below, modified from vail outlines a suggested procedure for well log sequence analysis interpret depositional lithofacies on logs using cores and cuttings to calibrate the log. Seismic fragility analysis of multispan reinforced. Sequence stratigraphy american association of petroleum. Four maximum flooding surfaces mfs were also delineated in the seismic data. Application of seismic stratigraphy and structural. Seismic interpreters can be geologists, geophysicists, and even engineers. Pdf integration of seismic facies and seismic sequence. This systematic integrated petrophysical seismic sequence analysis provides better understanding of the relationship among the lithology, interpreted reservoir quality, organic content, and regional geometries. Boundaries are manifested as discontinuities in seismic sections and are located mainly by finding reflection terminations. Probabilistic seismic hazard analysis psha combines the probabilities of all earthquake scenarios with different magnitudes and distanceswith predictions of resulting ground motion intensity, in order to. This systematic integrated petrophysicalseismic sequence analysis provides better understanding of the relationship among the lithology, interpreted reservoir quality, organic content, and regional geometries.
Two applications of the quadratic type of timefrequency representations are demonstrated. The emphasis will be on the application of techniques in play and prospect analysis, not on jargon or the support of one sequence stratigraphic model over another. The research study provides a seismic assessment of the bridge in cavite using nonlinear static and dynamic analysis. Pdf seismic sequence analysis and attribute extraction. Seismic stratigraphy is the study of stratigraphy and depositional facies as interpreted from seismic data. Structural and seismic sequence stratigraphy analysis of. Sequence and seismic stratigraphy apply very different scales of study. We understand that this process can be timeintensive and often the features we look for can be subtle. Every reflection package provides information on depositional history and the display on your work station becomes much more interesting. Leetaru may161997 iu vc illinoispetroleum1511996 illinoisstategeologicalsurvey williamw. Stratigraphic analysis of seismicreflection data collected from the study area was mainly applied to the floridan aquifer system and used to identify four provisional seismic sequences, which extend vertically from near the base of the floridan aquifer system upward to the lower part of the intermediate confining unit. Pdf seismic sequence stratigraphy analysis using signal mode.
We approximated the distribution of centroid depths consistent with the seismic data with a gaussian pdf with a mean of 3. Late cenozoic evolution of the northern north sea and. Formerly, a book, now available on cdrom, this title was written to be an introduction to the geologic interpretation of seismic data. Turbidites characterization from seismic stratigraphy analysis. The joint timefrequency representation of a seismic reeection pattern is often much more easily interpreted in terms of subsurface stratiication than a time or frequency domain description alone. In this section the probabilistic seismic hazard analysis accounting for both mainshock and aftershocks effects is formulated. Sequence stratigraphy, seismic stratigraphy, and seismic. Bulletin of earthquake engineering, volume 17, issue 10. Turbidites characterization from seismic stratigraphy.
To be effective, it is necessary to teach geologists and engineers a bit of geophysics, and geophysicists and engineers a bit of. This paper presents a seismic sequence and structural analysis of a high resolution threedimensional seismic reflection survey that was acquired in june 2000. Alongside 3d seismic, longreach horizontal drilling and the application of plate tectonics to exploration, sequence stratigraphy has been one of the greatest scientific advances within the petroleum geology industry of the last 50 years. Seismic attributes and their applications in seismic. Petroleum geology and petroleum geophysics department of geosciences faculty of mathematics and natural sciences university of oslo june, 20.
Pdf seismic stratigraphy has initiated a revolution in stratigraphic analysis. Seismic stratigraphy services applied stratigraphix. Tectonics and seismic sequence stratigraphy home geological. Geomechanical analysis of fluid injection and seismic. The seismic experience data show that hvac duct and damper systems exhibit extremely good performance under strongmotion seismic loading, with the pressure boundary being retained in all but a handful of cases. This will define the genetic packages related to the seismic sequences and system tracts by finding discontinuities. Sequence boundaries of interest were also picked between these mfss. This upscaling of the view, from individual outcrops to basin wide sedimentation patterns, has proved itself a. Guidelines for seismic verification of hvac duct and. Research on timehistory input methodology of seismic analysis.
Thus, the present paper investigated the effect of aftershocks on seismic responses of multispan reinforced concrete rc bridges. Third and fourth order seismic and stratigraphic sequences based on 2d seismic data from the. Application to the netherlands offshore f3 block e. Seismic sequence stratigraphy analysis in the gulf of. Seismic stratigraphic analysis is based on identification and correlation of the sequencebounding surfaces on seismic reflection profiles. Research on timehistory input methodology of seismic. Unconformities are recognized as surfaces onto which reflectors converge mark these terminations with arrows draw the unconformity surface between the onlapping and downlapping reflections above. Reflections generally indicate either 1 time isochronous or stratal surfaces or 2 unconformities. There are three primary steps in processing seismic data deconvolution, stacking, and migration, in their usual order of application. John pigott one of the most revolutionary, most effective, yet most underutilized tools introduced into exploration this century is that of seismic stratigraphy. A seismic sequence stratigraphic analysis hafiz zeeshan akram master thesis in geosciences discipline. Probabilistic seismic hazard deaggregation of ground. Probabilistic seismic hazard analysis for seismic sequences.
Use well log information to try to determine lithofacies to then estimate where the sequences and system tracts are located. This basic sequence now is described to gain an overall understanding of each step. Several methods exist to input seismic excitation when making the seismic timehistory analysis for design of. Seismic sequence analysis introduced by aapg memoir 26 payton 1977 was further advanced via seminal articles by jervey 1988 and posamentier et al. Seismic sequence stratigraphy and tectonic evolution of. Pdf reflecting depositional events, sequence stratigraphy can be commonly observed, and mapped on seismic amplitude volumes, but it is also often. Such a systematic knowledge of the leonardian strata may. The gamma ray log is high in the first sequence and gradually lower toward the upper sequence suggesting an overall coarsening upward succession. Shear wave splitting analysis is performed to define the fracture pattern and stress field during the amatrice. The seismic line used in this exercise is a copy of figure 39 from page 49 of the aapg atlas of the sequence stratigraphy in offshore south african divergent basins. The objective of this gl o macs stratigraphy training seminar is to get more out of seismic and well data through the use of sequence and seismic stratigraphy and integrated stratigraphic analysis to further constrain geological models. A high resolution seismic sequence analysis of the malta. Shilts,chief naturalresourcesbuilding 615eastpeabodydrive champaign,illinois618206964. Well log analysis based on the well data, five sequences were separated by log characteristics figure 2.
Seismic stratigraphy, a technique for improved oil. The goal of seismic attribute analysis is to improve the spatial prediction of structural and stratigraphic features, as well as petrophysical and geomechanical rock properties throughout the reservoir. Seismic and sequence stratigraphic interpretation of the area of. State key laboratory of reactor system design technology, nuclear power institute of china, chengdu, china. Recommended procedures for performing seismic sequence analysis include identifying the unconformities in the area of interest. The whole sequence is described by a hpp point process and, within a sequence, aftershocks are described by a nhpp whose rate function is conditional to the mainshock magnitude. The philosophical underpinning of seismic sequence analysis is that the strata of a sedimentary basin were deposited in geographically and tem porally confined. Seismicsequence stratigraphic analysis of regional 2d lines in. Seismic stratigraphic analysis indicates that there are six seismic units or depositional sequences bounded by erosional unconformities. Seismic sequence and facies analysis offers a systematic method to interpret both 2d and 3d seismic data. The guidelines were applied to verify the seismic adequacy of a nonseismically designed hvac system at a nuclear power plant. The aim of this paper is to analyze this thick stratigraphic succession using sequence stratigraphy, seismic attributes in order to.
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