Seismic facies analysis from prestack data using self. Different approaches can be used to search and identify these from the seismic data. Seismic facies identification and classification using. It is important because geological concepts of stratigraphy can be applied on seismic data and hence, seismic stratigraphy can be used as a predictive tool for petroleum system elements like reservoir, seal and source rock. To demonstrate the advantages of this approach, we describe the application of supervised machine learning to a seismic facies analysis using 3d broadband seismic reflection data of the northern north sea. Topics are presented from a practical point of view and are supported by wellillustrated case histories. Seismic facies analysis and seismic geomorphology are important tools for the analysis of depositional elements in subsurface. Seismic attributes and their applications in seismic.
Qualitative analysis of seismic facies derived from the classification is a common practice. Horizontally compressed wiggle displays also reduce the trace excursion or amplitude of the reflections, making important changes in reflectivity more difficult to discern. Seismic facies analysis seismic analysis of structures with irregularities seismic loads guide to the seismic load provisions of asce 716 seismic loads guide to the seismic load provisions of asce 710 pdf seismic evaluation and retrofit of existing buildings 4117 seismic evaluation and retrofit of exi seismic evaluation and retrofit of. Alluvial palaeogeography of the guaritas depositional sequence of southern brazil pages. Semisupervised multiattribute seismic facies analysis. All of the som classification volumes and to some degree probability volumes defined components of this seismic facies e. The distribution of seismic facies types figure 3 usually trend parallel to the present shelf location nwse, although patchy distributions are also common. Sep 18, 2018 the detection of thin sandstone reservoirs on seismic sections is a matter of seismic resolution and bed thickness. Seismic reflection pattern and attribute analysis as a. Traditional single seismic amplitudebased facies analysis is complemented by a multiattribute seismic.
Applying principal component analysis to seismic attributes for interpretation of evaporite facies. Seismic facies analysis is the description and interpretation of seismic reflection parameters, such as configuration, continuity, amplitude, and. An approach to increase the credibility in automatic seismic facies. The key elements used to determine seismic facies and depositional setting are bedform internal and external configurationgeometry, lateral continuity, amplitude, frequency, and interval velocity. Seismic waveform shape and character define facies with significant detail compared to time and amplitude mapping. Seismic stratigraphy and depositional facies models eage. Analisis bentuk eksternal dan tekstur internal benda geologi dari penampang rekaman seismik dikenal dengan analisa fasies seismik atau seismic facies analysis.
Structural interpretation, seismic facies analysis and depositional model of offshore sandakan subbasin. This paper shows a gross seismic facies mapping analysis and structural interpretation of regional deepwater nw sabah especially at sabah trough. A seismic facies is the manifestation of the underlying geologic facies or structural feature in the seismic amplitude data. Analisis fasies seismik seismic facies analysis hidrokarbon minyak dan gas terdapat di dalam batuan sediment yang terbentuk dalam berbagai lingkungan pengendapan seperti channel sungai, sistem delta, kipas bawah laut submarine fan, carbonate mound, dan reef. Seismic facies are mappable, three dimensional seismic units composed of groups of reflections whose parameters differ from those of adjacent facies units. Seismic stratigraphy techniques help us for stratigraphic interpretation of seismic reflectors. With those relationships established, an integrated seismic inversion and classification workflow utilizing multidimensional probability density functions pdfs for each possible facies and a supervised bayesian classification scheme generates probability cubes for the distribution of the different facies that have been defined with lithology. Determining depositional environment from seismic reflection characteristics analysis of reflection character. Criterion for fracture transition to critical stage.
Seismic facies analysis concepts, geophysical prospecting. Abstractduring the past decade, the size of 3d seismic data volumes and the number of seismic attributes have increased to the extent that it is difficult, if not impossible, for interpreters to examine every seismic line and time slice. It was no accident that complex seismic trace analysis first appeared with seismic stratigraphy. The seismic facies was analyzed by using the seismic sedimentology approach based on 3d seismic data, and summed into eight types of seismic facies which could be well related to sedimentary facies. Methodology simple seismic horizon based facies analysis and attribute analysis method have been adopted to construct number of gross depositional environment. Seismic facies classification refers to the interpretation of facies type from the seismic reflector information. Seismic attribute selection for unsupervised seismic facies analysis using user guided dataadaptive weights article pdf available in geophysics 832. A seismic facies unit can be defined as a sedimentary unit which is different from adjacent units in its seismic characteristics. We recommend the application of techniques such as principal component analysis, kmeans clustering, selforganized mapping som and generative topographic mapping gtm, which help with the study of facies variation with the shale. Chapter bs brookian sequences seismic facies analysis.
Moreover, this approach can be conveniently adapted to problems where prior training. Pdf seismic attribute selection for unsupervised seismic. The geometries of the reflection configurations are the most varied aspect of seismic data, including parallel, prograding, mounded, draped, onlap, and onlap fill. Techniques for enhancing seismic facies analysis aapg wiki. Seismic expression of depositional elements associated. This selforganizing map som 3d facies analysis program is a tool to generate a seismic facies map from multiple seismic attributes in an unsupervised fashion. Click download or read online button to get seismic stratigraphy book now. Pdf seismic facies analysis and structural interpretation. Seismic waveform carries information about frequency, phase and amplitude. To convert depth, all seismic lines were picked and tied with selected wells. Seismic facies units are groups of seismic reflections whose parameters configuration, amplitude, continuity, frequency, and interval velocity differ from adjacent groups. Abstract seismic facies analysis makes use of different seismic parameters in order to get other than structural information.
Seismic facies analysis makes use of different seismic parameters in order to get other than structural information. Seismic facies analysis is the description and interpretation of seismic reflection parameters, such as configuration, continuity, amplitude, and frequency, within the. Seismic imaging and statistical analysis of fault facies models. These could be based on analysis of either the seismic waveforms or the seismic attributes. Pdf 48 seismic facies analysis for fluvial depositions. The concept of seismic facies analysis is based on the fundamentals of seismic stratigraphy.
Seismic attributes with six objective sequence boundaries were extracted. Seismic stratigraphy and depositional facies models. Seismic facies analysis after establishing the key horizons, seismic facies in the units between horizons were identified. By combining attribute analysis, avo attribute analysis, prin and supervised facies cipal component analysis. They expected that additional attributes would soon quantify their seismic facies.
Sedimentary facies analysis has multiple solutions, so we should combine the analysis of core, well logs, and seismic in order to get the best results figure 2. Different exploration target or seismic facies may be sensitive to different seismic attributes, and often times interpreters. Six seismic facies were recognized in the study area table 2. Seismic expression of depositional elements associated with a. Pdf semisupervised multiattribute seismic facies analysis. Carbonate seismic facies can be interpreted through analysis of the configuration, amplitude, frequency, and continuity of the seismic reflections. Depositional environment and reservoir facies prediction of. The sum of all characteristics exhibited by a sedimentary rock and from which its origin and environment of formation may be inferred.
To construct seismic sections after common processing steps, the data from different offsets are stacked together. The link with sedimentology and depositional facies models is made. V arious problems arise in relating seis mic facies analysis concepts to geologic concepts. However, we demonstrate in this paper that the quantitative interpretation of seismic facies is possible provided a geological understanding of the seismic. Synthesis of seismic facies analysis, sequence stratigraphy and structural interpretation can help reconstruct basin paleogeography and. Seismic facies analysis and structural interpretation of. Depositional setting analysis using seismic sedimentology. 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. The figure below is a depositional facies map for the glob alt intervals basal sequence boundary, constructed by integrating the biofacies map, the net sandstone map, and the seismic facies map figures 3, 5, and 4, respectively. This site is like a library, use search box in the widget to get ebook that you want. Any variations observed in these parameters are again interpretable results of. Pdf seismic facies analysis and depositional process interpretation of george field offshore niger delta was carried out with a view to. Seismic facies analysis is used to develop gross depositional environment maps in areas of low well density tgss highly experienced and qualified team provides the description and geologic interpretation in terms of environmental setting, lithofacies, etc. This paper aimed to investigate the character and genesis of depositional elements and erosive features associated with an eocene progradational shelf margin in northern santos basin.
Seismic stratigraphy download ebook pdf, epub, tuebl, mobi. Seismic attributes are the components of the seismic data, which are obtained by measurement, computation, and other methods from the seismic data. Quantitative interpretation of seismic facies a case. Lithology, rock properties were determined from the interceptgradient crossplot. 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.
Constraining selforganizing map facies analysis with stratigraphy. This singularity map facilitates interpretation, facies characterization, and integration of well and seismic data on the level of local texture. Deep learning seismic facies on stateoftheart cnn architectures jesper s. By applying the monoscale method to both migrated seismic sections and welllog data, we create an image of the earths local singularity structure. Avo intercept and gradient attributes were extracted from the linear regression of prestack seismic data. Using selforganizing maps to define seismic facies. Sequence and seismic stratigraphy in facies analysis. To address this problem, several seismic facies classification algorithms including kmeans, selforganizing maps, generative topographic mapping, support. Peter vail and his colleagues at exxon, who developed seismic stratigraphy, learned of the new attributes and were enthralled by the possibilities they offered. Jun 04, 2008 gelombang seismik yang menembus dan terefleksikan kembali ke permukaan akan memberikan gambaran bentuk eksternal dan tekstur internal dari bendabenda geologi tersebut. Seismic facies analysis and reef patterns springerlink. Structural and seismic facies interpretation of fabi field, onshore niger delta, nigeria kehinde oluwatoyin olowoyo dissertation. Seismic facies analysis and structural interpretation of the. 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.
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 and depositional process interpretation of george field offshore niger delta was carried out with a view to determining the hydrocarbon potential of the area. In seismic cubes there is a seismic trace for each bin and for each reflector there is a wavelet which hasproperties that depend on the reflective surface. Five different sets of seismic attributes were selected for som analysis to define this pressure associated seismic facies. Quantitative interpretation of seismic facies a case study. A tribute to the research and teaching of harold g. The integrated use of spectral decomposition, avo analysis. Seismic phase diagrams help us combine the seismic information of wells with the overall changes of seismic facies in the work area. Facies analysis by integrating 3d seismic attributes and well logs for prospect identification and evaluation a case study from northwest china xingjian wang, bo zhang, tao zhao, junbo hang, hao wu, and ziquan yong. One technique that proves to be a preliminary check for environment of reservoir deposition and its architecture is the concept of seismic facies analysis veeken 2006. Seismic facies analysis interprets environmental setting and lithofacies from seismic data. The agi glossary of geology 1972 defines facies as. Seismic facies analysis of thin sandstone reservoirs, north. Finally, the results are compared to the obtained using principal components analysis pca.
Structural and seismic facies interpretation of fabi field. Cores, outcrops, well logs, and mud logs establish the sedimentary facies type, seismic facies type, and seismic waveform classification and lithology prediction. Pdf structural interpretation, seismic facies analysis. This paper aimed to investigate the character and genesis of depositional elements and erosive features associated with an eocene. Apr 21, 2006 the high quality seismic and limited well data from this field is one of the few datasets of this kind presented in the literature.
First, we extract features from the data by calculating 15 seismic attributes. Depositional environment and reservoir facies prediction. Facies analysis by integrating 3d seismic attributes and well logs for prospect identification and evaluation a case study from northwest china. 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 classification techniques have been used for years in interpretation and reservoir characterization workflows. Seismic facies analysis using machine learningmachine. These could be based on analysis of either the seismic waveforms or the seismic. Batuan sedimen yang terbentuk pada berbagai lingkungan pengendapan tersebut. The problem is observed in the northwestern desert of egypt, where several thin oilbearing sandstone reservoirs are located, among them qasr field which produces oil from the.
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