We analyzed the seismic textures, and the integration of lithologic data defined the corresponding to three seismic facies. Seismic facies analysis for lithofacies prediction, okam field of niger delta, nigeria article pdf available in iraqi journal of science 593b. Structural interpretation, seismic facies analysis and depositional model of offshore sandakan subbasin. Missole facies description and sequence stratigraphy analysis allow a new proposal of depositional environments of the douala subbasin. 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. Pdf seismic facies analysis for lithofacies prediction. Facies analysis and sequence stratigraphy of missole.
Structural and seismic facies interpretation of fabi field. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Seismic facies analysis of the western gulf of mexico and. We understand that this process can be timeintensive and often the features we look for can be subtle. An understanding of the depositional setting of the cherokee sand bodies, in our study area of the weirman field fig. Facies analysis, genetic sequences, and paleogeography of the. Seismic facies analysis makes use of different seismic parameters in order to get other than structural information. Seismic facies analysis is commonly carried out by classifying seismic waveforms based on. Spatial statistical analysis reveals three styles of stratigraphic channel distribution. Facies and depositional environments for the coquinas of. Seismic facies are mappable, three dimensional seismic units composed of groups of reflections whose parameters differ from those of adjacent facies units. Seismic facies analysis after establishing the key horizons, seismic facies in the units between horizons were identified.
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. Seismic stratigraphy and depositional facies models 1st edition. It uses the results of an unconstrained classification, like principal component analysis, by extracting a representative waveform from specific clusters, or facies. A comparison of classification techniques for seismic facies. 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. Reservoir characterization using microseismic facies analysis.
Pdf integration of seismic facies and seismic sequence. Seismic attribute analysis revealed local variation in the lithologies and facies distribution. Pdf seismic facies analysis based on kmeans clustering. Seismic facies 2 finegrained deposits is widespread in. Pdf semisupervised multiattribute seismic facies analysis. We present here some of the initial results of an ongoing investigation of the study area. Sb91sb106 february 2016 with 395 reads how we measure reads. Stochastic approach to delineate facies an integrated study. It must be noted that the object trends impose only soft conditioning to. This generates a volume of facies probabilities corresponding to the seismic volume. Seismic attribute selection for unsupervised seismic facies analysis using user guided dataadaptive weights article pdf available in geophysics 832. Seismic facies analysis is commonly carried out by classifying seismic waveforms based on their shapes in an interval of interest.
Patterns classification in assisting seismicfacies analysis. Fourteen sandy depositional units averaging 330 m in thickness are encased in 15 shale units. Seismic facies 1 faultborder deposits displays similar behavior in both basins, with occurrence restricted to the fault borders in a wide and welldefined area. A knowledgeintegration framework for interpreting seismic facies. Quantitative interpretation of seismic facies a case study.
Seismic facies map obtained from amplitude after a pca, blended with one. Two types that help in seismic facies analysis are horizontally compressed wiggle displays and color amplitude displays. Characterization of facies within a hydrocarbon reservoir is essential for potential prospect identification and evaluation. Six seismic facies were recognized in the study area table 2. A knowledgeintegration framework for interpreting seismic facies ivan d. Seismic stratigraphy and depositional facies models eage.
This generates a volume of facies probabilities corresponding to. 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. Seismic stratigraphy and depositional facies models. The distribution of seismic facies types figure 3 usually trend parallel to the present shelf location nwse, although patchy distributions are also common. 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. In this paper, we present a practical workflow which integrates poststack seismic attributes and welllog facies analysis t. Topics are presented from a practical point of view and are supported by wellillustrated case histories. Integrated corelog facies analysis and depositional model of. Every reflection package provides information on depositional history and the display on your work station becomes much more interesting. Facies analysis indicates that guanajuato conglomerate were deposited in alluvial fans and fluvial environments. A knowledgeintegration framework for interpreting seismic. Seismic facies analysis using generative topographic mapping. 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. A seismic facies unit can be defined as a sedimentary unit which is different from adjacent units in its seismic characteristics.
Techniques for enhancing seismic facies analysis aapg wiki. Constraining 3d facies modeling by seismicderived facies. Application of seismic facies classification, spectral. Veeken and bruno van moerkerken, provides a systematic approach for the description and evaluation of subsurface reservoirs. Seismic facies analysis and structural interpretation of the. Constraining 3d facies modeling by seismicderived facies probabilities. If we are interested in fault geometries, a variety of geometric. Marroquin1 abstract in recent years, the size of seismic data volumes and the number of seismic attributes available have increased. Physical stratigraphy and facies analysis of the castissent tecto. Next, we use joint timefrequency analysis to characterize reservoirs because variations in frequency content are sensitive to subtle changes in re. 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 modeling utilises two main types of techniques. Sequence stratigraphic analysis revealed that the succession consists of two sequence boundaries dated, 10. The link with sedimentology and depositional facies models is made. A comparison of classification techniques for seismic facies recognition tao zhao1, vikram jayaram2, atish roy3, and kurt j.
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. 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. A comparison of classification techniques for seismic facies recognition 1. Pdf seismic attribute selection for unsupervised seismic. Recognition and analysis of seismic facies in the rift. As a result, the task of recognizing seismic anomalies for the prediction of stratigraphic features or reservoir properties can be. A graphic approach to facies interpretation on free shipping on qualified orders.
Three characteristics of reflection attributes were used to distinguish between different seismic facies which are frequency, internal reflector configuration and amplitude strength. If multiple facies are present, the nature of the pdf changes and new modes arises. Seismic facies identification and classification using. Six reservoir bodies were mapped out in the study area, two of which were hydrocarbon bearing with. Minturn formation, southeastern eagle basin, northcentral colorado. Guided facies modeling using 3d seismic and well data. Facies constrained classification is a twostage process.
Velocities vp and vs versus porosity in 173 gassaturated carbonate core samples. 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 facies and hydrocarbon potential of carbonate. 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. 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. Seismic facies identification and classification using simple.
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. Facies descriptions include lithology and thickness, color, composition, grain characteristics, bedding characteristics, sedimentary structures, nature of overlying. Petroelastic logfacies classification using the expectation. 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. 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. 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. Sandbody size and distribution, and the character, vertical stacking and abundance of lithofacies and palaeosols entisols, inceptisols, histosols differs locally within the two.
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. Seismic facies analysis is the description and interpretation of seismic reflection parameters, such as configuration, continuity, amplitude, and frequency, within the stratigraphic. A workflow is designed to integrate outputs from seismic facies classification. 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. 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. Schematic diagram of pca analysis showing how a 3d plot of three data volumes reduced to two pca components. 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. The authors have an extended career as geoscience consultants, having spent over 25 years working in the oil and gas industry. Seismic facies classification using bayesian networks. Densityneutron and spontaneous potential sp logs in five recently drilled wells were used to calculate effective porosity and shaliness, which correlate well. A seismic facies analysis sfa was performed in order to integrate fracture relevant seismic attributes and delineate areas characterized by their degree of fracturation.
A simple form of bayes theorem is then used to compute the probability of occurrence of each of the facies at the measured locations. Seismic facies and hydrocarbon potential of carbonate reservoirs in ramp settings 5 interparticle, intercrystalline, moldic, vug, intraparticle, fracture and fenestral wang, 1997. 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. 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. Depositional processes and controlling factors of sediment. Facies analysis, stratigraphie architecture and depositional. Seismic sequence and facies analysis offers a systematic method to interpret both 2d and 3d seismic data. The seismic stratigraphy and depositional facies models textbook by paul c. Seismic facies analysis is an important step in the interpretation of seismic data for reservoir characterization.
Pdf structural interpretation, seismic facies analysis. Outcrop correlation of facies, sedimentary environments, and genetic sequences. 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. 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. Detailed facies descriptions and interpretations, together with the results of facies frequency analysis, standard facies models and upper. Semisupervised multiattribute seismic facies analysis article pdf available in interpretation 41.
Seismic facies analysis sfa analyzes automatically the character of the seismic traces to generate seismic facies maps 2d analysis or cubes 3d analysis. Seismic facies and geometries megasequence d is characterized, in general, by laterally continuous low to mediumamplitude reflections within a 200mthick mounded drift. Fundamentals of seismic data interpretation and evaluation. Mar 21, 2016 we introduce a novel approach, microseismic facies analysis, to extract additional information from microseismic event clusters. Geohorizons july 201423 geohorizons july 201424 challenges, the following workflow figure1 was designed in order to build a geocellular model figure2. Seismic facies interpretations play a significant roll in initial basin exploration, prospect evaluation, reservoir characterization, and ultimately, field development. Pdf unsupervised seismic facies analysis using wavelet. Unsupervised seismic facies analysis using wavelet transform. Ppt seismic stratigraphy powerpoint presentation free to. Seismic stratigraphy services applied stratigraphix. If there were only one facies present, then the probability distribution function pdf of ai across the reservoir would be unimodal.
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