To localize frequency content in time, we have developed a novel method for computing a time. Each labeled facies provides a probability density function on the. Jun 09, 2015 seismic data interpretation 88 time derived horizon attributes curvature attributes type definition interpretation mean avg of min and max high and low throw of fault gaussian product of min. Detection of channel by seismic texture analysis using grey. The main goal of this paper is to implement event tracking automatically by introducing a dynamic time warping dtw algorithm vintsyuk 1968, berndt and clifford 1994 into the seismic interpretation workflow. All modern seismic interpretation software can perform the numerical transform that converts 3d seismic wiggletrace data into a 3d coherency volume. Seismic facies interpretation of fluvialmarginal marine sand.
The slab thickness is a weak function of the bandwidth of the data and a stronger function of the dip of the reflections. Thanks to the rgt model, this comprehensive approach is a new input for fault imaging complementary to seismic attributes. Introduction recent development of threedimensional 3d seismic datasets enables geologists to visualize and analyze buriedlands and seascapes revealed by subsurface geophysical. All interpretation tools are available in this window and the view can be zoomed, stretched, and squeezed in either direction. 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. Automatic seismic event tracking using a dynamic time warping. Forties example the forties field started production in 1977, and is one of the pioneers in the use of time lapse seismic for field management. Since the advent of 3d seismic interpretation systems, the basic workflow for interpretation of the seismic volume has been to load the segy data and well log data if available into the interpretation system, and immediately begin interpreting horizons and faults. Seismic attributes and their applications in seismic.
Study anomalies in the seismic response on the presence of gas and the lateral extent of the gasreservoir. Figure 4, 5, are if time slices displaying the slave. A geological interpretation of 3d seismic data of a salt. Gpu acceleration for seismic interpretation algorithms. Coherence is a continuity attribute that detects edges or discontinuities in seismic data along a horizon or time slice. Time frequency analysis is an important technology in seismic data processing and interpretation. B interpreted growth faults in seismic amplitude taken from perov, 2009. Nov 14, 2014 a time slice is a horizontal display in 3d seismic data. By applying spatial derivatives, structural a c b d inline time slice time slice. Time slice through a 3d seismic data set from kearey and brooks, 1991. The seismic interpretation window gives the user a classical 2d view of seismic data. In continuum, optimal parameters were selected for four more effective attributes and they have been applied again to the same 1.
The narrow bands of low coherency values that extend across this time slice are created by. Shale reservoir characterization is also the focus of 3d seismic interpretation. The time slice is the first step toward 3d interpretation of a 3d seismic volume. These velocity functions are interpolated, both spatially and in twoway travel time, and all seismic gathers are then corrected for normal moveout using them. If you continue browsing the site, you agree to the use of cookies on this website. Gpu acceleration for interpretation time slice inline crossline. Attributes for fluvial channel interpretation seg wiki. Machine assisted quantitative seismic interpretation a dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of. Sc at the university of calgary in geophysics in december of 2012.
The seismic sedimentology application researchon junggar basin. Three examples of the use of frequency slice filtering are presented, from forties field and ravenspurn field in the uk sector of the north sea, and from ormen lange field in the norwegian north sea. Using the event similarity prediction esp attribute, a more accurate fault map was created. The seismic sedimentology application researchon junggar. Basics of seismic interpretation incorporated research. Forties example the forties field started production in 1977, and is one of the pioneers in the use of timelapse seismic for field management. For example, the figure 5 compares a seismic regular time slice in the geological space with an isot section in the flattened space. It was applied to the pliocene top, miocene top and a time slice to 2000ms. The use of computers in 3d seismic volume interpretation has not reached its full potential. Semisupervised multiattribute seismic facies analysis.
Semiautomated fault interpretation based on seismic attributes bo zhang1, yuancheng liu2, michael pelissier3, and nanne hemstra2. Wainuson, seismic facies interpretation in kra basin, gulf of thailand. Low coherency is delineated by seismic character discontinuity across boundaries. Seismic interpretation an overview sciencedirect topics. Use of seismic attributes and modeling in gas hydrate. Seismic well correlation interpretation strategyprocedure use of different interpretation techniques time slice, horizon slice, attributes figures.
Surface slicing is a novel approach to interpreting seismic horizons. Optimization on the high precision 3d seismic acquisition. Seismic attribute conditioning the fault patterns shown on the time slices fig. The seismic processor then selects the best set of velocities to use at a variety of reflectors and constructs a velocity function of twoway travel time. Sc from memorial university in geophysics in 2005, followed by a m. A time slice view of the data is an improvement over vertical sections for the interpretation of depositional systems because it provides the opportunity to see a portion of depositional systems in map view. A time slice is a quick, convenient way to evaluate changes in amplitude of seismic data. This technique involves visualizing and interpreting areally finite portions of horizons on time slice slabs of the data. Seisvision software is a powerful, fully integrated 2d and 3d seismic interpretation system that provides a full range of fitforpurpose interpretation capabilities, attribute analysis and mapping tools. Conversely, if contours widen between a shallow and a deeper time slice, then the feature is a structural high figure 7. Interpretation of timelapse seismic data from a heavy oil. Channels will exhibit this low coherency across the seismic trace as seen.
Channels will exhibit this low coherency across the seismic trace as seen in figure 2. If contours narrow between a shallow and a deeper time slice, then the feature is a structural low figure 7. The attribute analysis was conducted to locate the gas presence. Semiautomated fault interpretation based on seismic attributes. Basics of seismic interpretation slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Noises and data gaps complicate the seismic data processing and subsequently cause difficulties in the geological interpretation. Horizon slice along horizon a through seismic amplitude volume. Attributes assisted seismic interpretation in prestack.
Seismic data interpretation 88 time derived horizon attributes curvature attributes type definition interpretation mean avg of min and max high and low throw of fault gaussian product of min. Currently, byron is employed at nexen inc in calgary, working as a geophysicists within nexens oil sands resource development and appraisal team. It was applied to the pliocene top, miocene top and a timeslice to 2000ms. Visualization and interpretation in 3d true volume. Seismic attributes, seismic geomorphology, local structural dip 1. Seismicwell correlation interpretation strategyprocedure use of different interpretation techniques time slice, horizon slice, attributes figures. The time shifts are estimated automatically using the dtw algorithm according to the characterization of seismic data, which is the key. A seismicstructural interpretation, on the identification. These sections are a powerful tool to unveil the complex structures hidden by the faults and folds. Interpreters expect from interpretation tools all basic functions that they can find in microsoft paint and some 3d capabilities similar to what available in autocad. Combining the results of chimneys detection and the seismic interpretation.
Seismic attributes and their applications in seismic geomorphology sanhasuk koson, piyaphong chenrai and montri choowong. An approach towards automated fault interpretations in. Timefrequency analysis of seismic data using local attributes. Automatic seismic event tracking using a dynamic time. Seismic data interpretation is a primary method in viewing and mapping. Mioceno norte area, lake maracaibo, venezuela downloadable pdf part number ri0265d seismic sedimentology by stratal slicinga case history in the mioceno norte area, lake maracaibo, venezuela, by hongliu zeng, w.
Seismic facies interpretation of fluvialmarginal marine. The meander belt flows northsouth and northeastsouthwest along the west of the kra basin and is up to 10 km wide. Seismic section through the well vertical seismic section of inline 933 seismic examples different lines, slices. Interpretation of seismic data is the primary concern of geophysicists. Sc thesis topic is titled processing and interpretation of timelapse seismic data from a heavy oil field, alberta, canada. The 112 ms time slice shows highsinuosity meandering channel and a representative seismic crosssection. Analysis of seismic data to generate reasonable models and predictions about the properties and structures of the subsurface. Detection of channel by seismic texture analysis using. Gpu acceleration for seismic interpretation algorithms jon marbach, ph. The processing in the first two steps is applied time slice by time slice. A timeslice view of the data is an improvement over vertical sections for the interpretation of depositional systems because it provides the opportunity to see a portion of depositional systems in map view. For a detailed description of the technique see stark. Additionally, contours associated with a reflection horizon can be traced from time slices.
Pdf timefrequency analysis of seismic data using local. Inlines, crosslines, time slices and other line types can be displayed in an interpretation window. By applying spatial derivatives, structural a c b d inline timeslice timeslice. A case study from the jura foldandthrust belt switzerland alexander malz, herfried madritsch, and jonas kley. Attributes assisted seismic interpretation in prestack time. The if time slice also enhances tectonic features otherwise masked on the conventional time slice displays. Pdf semisupervised multiattribute seismic facies analysis. Note how regions of high entropy, shown in red, are associated with the fault. Enhanced fault imaging from seismic and geological model. A seismicstructural interpretation, on the identification of. Application of multiattributes and spectral decomposition. It is computed by measuring the similarity of seismic waveforms in different directions. The procedure followed was the interpretation of seismic lines and cross lines across the mc area, producing a seismic map view grid with the top and base of salt interpreted, being this structure the prevailing one in the subdivision. In the image shown in figure 4, a time slice through the instantaneous amplitude entropy shows an apparent edge effect, while the conventional.
Seismic entropy can also reveal nongeologic aspects of the data. View seismic interpretation ppts online, safely and virusfree. Thickness can be determined by seismic stratigraphic interpretation and conversion from time data to depth. Y correlate and assignfault segments can be done on vertical view, time slice, map view or. As seen above right, faults and their trends are more obvious than on conventional timeslice seismic data above left. Application of multiattributes and spectral decomposition with rgb. Improving 2d seismic interpretation in challenging settings by integration of restoration techniques. We discuss a recent development and application of the multichannel time slice singular spectrum analysis mtsssa for 3d seismic data denoising in time domain. Pdf timefrequency analysis is an important technology in seismic data processing and interpretation. Basics of seismic interpretation 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. Thickness, fracture permeability, brittleness, organic richness, pore pressure, and more can be determined from seismic data chopra et al.
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