Facies analysis and sequence stratigraphy of missole. Six seismic facies were recognized in the study area table 2. A simple form of bayes theorem is then used to compute the probability of occurrence of each of the facies at the measured locations. If there were only one facies present, then the probability distribution function pdf of ai across the reservoir would be unimodal. Seismic facies analysis seismic analysis of structures with irregularities seismic loads guide to the seismic load provisions of asce 710 pdf seismic loads guide to the seismic load provisions of asce 716 seismic evaluation and retrofit of existing buildings 4117 seismic evaluation and retrofit of exi seismic seismic manual seismic. Seismic stratigraphy and depositional facies models 1st edition. Seismic facies analysis is an important step in the interpretation of seismic data for reservoir characterization. Statistical methods generally provide the most likely classification of lithological facies along the borehole by maximizing a function that describes the likelihood of a set of rock samples belonging to a certain facies.
Jun 24, 2015 log facies classification methods aim to estimate a profile of facies at the well location based on the values of rock properties measured or computed in welllog analysis. The distribution of seismic facies types figure 3 usually trend parallel to the present shelf location nwse, although patchy distributions are also common. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Seismic facies and geometries megasequence d is characterized, in general, by laterally continuous low to mediumamplitude reflections within a 200mthick mounded drift. Application of seismic facies classification, spectral.
Seismic facies classification using bayesian networks. A comparison of classification techniques for seismic facies recognition tao zhao1, vikram jayaram2, atish roy3, and kurt j. Seismic facies analysis using generative topographic mapping. Pdf 48 seismic facies analysis for fluvial depositions. Fundamentals of seismic data interpretation and evaluation. Fourteen sandy depositional units averaging 330 m in thickness are encased in 15 shale units. Spatial statistical analysis reveals three styles of stratigraphic channel distribution. Facies analysis and paleoenvironmental reconstruction of. Horizontally compressed wiggle displays also reduce the trace excursion or amplitude of the reflections, making important changes in reflectivity more difficult to discern. Constraining 3d facies modeling by seismicderived facies.
Some aspects of seismic sequence stratigraphy and structural deformation basin analysis are presented, but these topics will be described in more detail in the next volume of the series. Seismic facies analysis is the description and interpretation of seismic reflection parameters, such as configuration, continuity, amplitude, and frequency, within the stratigraphic. Seismic facies mapping is the best and most robust way of reconstructing miocene to recent palaeogeographies and, hence, predicting reservoir, seal, and source rock distribution in areas like the mexican ridges characterized by poor and scattered well data. However, we demonstrate in this paper that the quantitative interpretation of seismic facies is possible provided a geological understanding of. Seismic stratigraphy and depositional facies models. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. A seismic facies analysis sfa was performed in order to integrate fracture relevant seismic attributes and delineate areas characterized by their degree of fracturation. Mar 21, 2016 we introduce a novel approach, microseismic facies analysis, to extract additional information from microseismic event clusters. Seismic facies analysis and depositional process interpretation of george field offshore niger delta was carried out with a view to determining the hydrocarbon potential of the area. The study and interpretation of the textures, sedimentary structures, fossils, and lithologic associations of sedimentary rocks on the scale of an outcrop, well section, or small segment of a basin comprise the subject of facies analysis.
Facies analysis, stratigraphie architecture and depositional. Seismic facies 2 finegrained deposits is widespread in. The 2e of seismic stratigraphy and depositional facies models summarizes basic seismic interpretation techniques and demonstrates the benefits of integrated reservoir studies for hydrocarbon exploration. Qualitative analysis of seismic facies derived from the classification is a common practice. Characterization of facies within a hydrocarbon reservoir is essential for potential prospect identification and evaluation. Seismic facies analysis for lithofacies prediction, okam field of niger delta, nigeria article pdf available in iraqi journal of science 593b. Ppt seismic stratigraphy powerpoint presentation free to. The seismic stratigraphy and depositional facies models textbook by paul c.
As a result, the task of recognizing seismic anomalies for the prediction of stratigraphic features or reservoir properties can be. A knowledgeintegration framework for interpreting seismic facies. Magnitudes of microseismic events due to hydraulic fracturing in a layered medium can be strongly influenced by the scalelength of layering eaton and maghsoudi, 2015, in particular, where only weak mechanical coupling exists between adjacent stratigraphic layers. Seismic facies classification, spectral decomposition and volume fusion.
Seismic facies identification and classification using simple. Veeken and bruno van moerkerken, provides a systematic approach for the description and evaluation of subsurface reservoirs. If multiple facies are present, the nature of the pdf changes and new modes arises. Conclusions test on geologic model and real seismic data shows the use of bn to classify seismic facies provides an efficient method, and this method could not only give the qualitative analysis of classification, but the quantitative analysis result of prediction probability of seismic facie. Pdf seismic facies analysis based on kmeans clustering. Two types that help in seismic facies analysis are horizontally compressed wiggle displays and color amplitude displays. Magnitudes of microseismic events due to hydraulic fracturing in a layered medium can be strongly influenced by the scalelength of layering eaton and maghsoudi, 2015, in particular, where only weak mechanical coupling exists between adjacent. Seismic attribute analysis from the existing well data in the entire field, its extremely important to make use of seismic data for facies delineation away from drilled wells. Seismic attribute selection for unsupervised seismic facies analysis using user guided dataadaptive weights article pdf available in geophysics 832. Six reservoir bodies were mapped out in the study area, two of which were hydrocarbon bearing with. The mapping was guided by detailed facies analysis based on wireline logs from 115 wells. A knowledgeintegration framework for interpreting seismic facies ivan d. Seismic stratigraphy services applied stratigraphix. Stochastic approach to delineate facies an integrated study.
Semisupervised multiattribute seismic facies analysis article pdf available in interpretation 41. Missole facies description and sequence stratigraphy analysis allow a new proposal of depositional environments of the douala subbasin. A workflow is designed to integrate outputs from seismic facies classification. While qualitative interpretation of individual attributes has dominated attribute analysis to date, the future belongs to quantitative multiattribute analysis for geologic prediction. Structural interpretation, seismic facies analysis and depositional model of offshore sandakan subbasin. Seismic facies analysis is commonly carried out by classifying seismic waveforms based on. Topics are presented from a practical point of view and are supported by wellillustrated case histories. Unsupervised seismic facies analysis using wavelet transform. Seismic facies are mappable, three dimensional seismic units composed of groups of reflections whose parameters differ from those of adjacent facies units. Seismic attribute analysis revealed local variation in the lithologies and facies distribution. Pdf seismic attribute selection for unsupervised seismic. Marfurt1 abstract during the past decade, the size of 3d seismic data volumes and the number of seismic attributes have in creased to the extent that it is difficult, if not impossible, for. Seismic sequence and facies analysis offers a systematic method to interpret both 2d and 3d seismic data. Sequence stratigraphic analysis revealed that the succession consists of two sequence boundaries dated, 10.
Seismic stratigraphy and depositional facies models eage. A comparison of classification techniques for seismic facies. Velocities vp and vs versus porosity in 173 gassaturated carbonate core samples. Outcrop correlation of facies, sedimentary environments, and genetic sequences. Seismic facies analysis of the western gulf of mexico and. Marroquin1 abstract in recent years, the size of seismic data volumes and the number of seismic attributes available have increased. Sb91sb106 february 2016 with 395 reads how we measure reads.
Sandbody size and distribution, and the character, vertical stacking and abundance of lithofacies and palaeosols entisols, inceptisols, histosols differs locally within the two. We understand that this process can be timeintensive and often the features we look for can be subtle. Three characteristics of reflection attributes were used to distinguish between different seismic facies which are frequency, internal reflector configuration and amplitude strength. Structural and seismic facies interpretation of fabi field. Example from the tightgas jonah field s eismic reservoir characterization is usually based on the interp retation of seismic attributes that relate to the geological feature or reservoir property of interest. Integrated corelog facies analysis and depositional model of. Seismic facies interpretations play a significant roll in initial basin exploration, prospect evaluation, reservoir characterization, and ultimately, field development. Every reflection package provides information on depositional history and the display on your work station becomes much more interesting. A knowledgeintegration framework for interpreting seismic. The objective of the study is to decipher the sediment dispersal system and depositional facies, within a distal deepwater, oligocene sequence in the krishnagodavari basin. Geohorizons july 201423 geohorizons july 201424 challenges, the following workflow figure1 was designed in order to build a geocellular model figure2. Seismic facies analysis is commonly carried out by classifying seismic waveforms based on their shapes in an interval of interest.
We present here some of the initial results of an ongoing investigation of the study area. Seismic facies analysis sfa analyzes automatically the character of the seismic traces to generate seismic facies maps 2d analysis or cubes 3d analysis. Petroelastic logfacies classification using the expectation. We analyzed the seismic textures, and the integration of lithologic data defined the corresponding to three seismic facies. Seismic facies 1 faultborder deposits displays similar behavior in both basins, with occurrence restricted to the fault borders in a wide and welldefined area. Logfacies classification methods aim to estimate a profile of facies at the well location based on the values of rock properties measured or computed in welllog analysis. Guided facies modeling using 3d seismic and well data. Conclusions test on geologic model and real seismic data shows the use of bn to classify seismic facies provides an efficient method, and this method could not only give the qualitative analysis of classification, but the quantitative analysis result. This class of log facies is further subdivided after an additional run of cluster analysis into three subclasses of log facies, which are classified as lf 11 normal high gammaray and low resistivity facies, lf 12 high gammaray and low resistivity facies with a higher acoustic transit time, and lf high gammaray and low. However, we demonstrate in this paper that the quantitative interpretation of seismic facies is possible provided a geological understanding of the seismic signatures is achieved. Detailed facies descriptions and interpretations, together with the results of facies frequency analysis, standard facies models and upper. A seismic facies unit can be defined as a sedimentary unit which is different from adjacent units in its seismic characteristics.
Facies analysis, genetic sequences, and paleogeography of the. Facies descriptions include lithology and thickness, color, composition, grain characteristics, bedding characteristics, sedimentary structures, nature of overlying. Along line mar07, 2 km to the northwest, erosional truncations cut into the top of megasequence d, indicating ongoing erosion at the modern seafloor fig. Patterns classification in assisting seismicfacies analysis. An understanding of the depositional setting of the cherokee sand bodies, in our study area of the weirman field fig. It must be noted that the object trends impose only soft conditioning to. Schematic diagram of pca analysis showing how a 3d plot of three data volumes reduced to two pca components. We introduce a novel approach, microseismic facies analysis, to extract additional information from microseismic event clusters. Minturn formation, southeastern eagle basin, northcentral colorado.
Next, we use joint timefrequency analysis to characterize reservoirs because variations in frequency content are sensitive to subtle changes in re. Seismic facies analysis and structural interpretation of the. Seismic facies and hydrocarbon potential of carbonate. Pdf integration of seismic facies and seismic sequence. Pdf semisupervised multiattribute seismic facies analysis. Physical stratigraphy and facies analysis of the castissent tecto. Facies constrained classification is a twostage process.
Pdf seismic facies analysis for lithofacies prediction. Densityneutron and spontaneous potential sp logs in five recently drilled wells were used to calculate effective porosity and shaliness, which correlate well. Seismic facies identification and classification using. Facies modeling utilises two main types of techniques. Unsupervised seismic facies analysis using wavelet transform and selforganizing maps article pdf available in geophysics 721 january 2007 with 589 reads how we measure reads. Seismic facies analysis is the description and interpretation of seismic reflection parameters, such as configuration, continuity, amplitude, and frequency, within the stratigraphic framework of a depositional sequence. In this paper, we present a practical workflow which integrates poststack seismic attributes and welllog facies analysis t. Seismic facies analysis makes use of different seismic parameters in order to get other than structural information. Recognition and analysis of seismic facies in the rift. The authors have an extended career as geoscience consultants, having spent over 25 years working in the oil and gas industry. If we are interested in fault geometries, a variety of geometric. Pdf structural interpretation, seismic facies analysis. This generates a volume of facies probabilities corresponding to the seismic volume. Constraining 3d facies modeling by seismicderived facies probabilities.
Techniques for enhancing seismic facies analysis aapg wiki. The link with sedimentology and depositional facies models is made. A comparison of classification techniques for seismic facies recognition 1. Seismic facies and hydrocarbon potential of carbonate reservoirs in ramp settings 5 interparticle, intercrystalline, moldic, vug, intraparticle, fracture and fenestral wang, 1997. Quantitative interpretation of seismic facies a case study. The facies analysis applied in this study is considered a more appropriate classification appro ach to understand these coquinas, since it is more flexible and. Facies analysis indicates that guanajuato conglomerate were deposited in alluvial fans and fluvial environments. Reservoir characterization using microseismic facies analysis. Depositional processes and controlling factors of sediment. Pdf unsupervised seismic facies analysis using wavelet. A graphic approach to facies interpretation on free shipping on qualified orders. Regardless of the method, attributes are used like filters to reveal trends or patterns, or combined to predict a seismic facies or a property such as porosity. Seismic facies map obtained from amplitude after a pca, blended with one. This generates a volume of facies probabilities corresponding to.
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