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