Pdf dhi analysis using seismic frequency attribute on. Interpretation of dhi characteristics with machine. Horizon attributes measures of the data that occur along a 3d surface through the seismic volume volume attributes measures of the data that occur over an interval of time through the seismic volume attribute meanings. Jun 09, 2015 seismic data interpretation 104 multiattribute seismicguided logproperty mapping seismic attributes can be used for mapping of log properties by finding the interrelationships between logs and seismic data at tie points multiattribute linear regression artificial neural network techniques training the seismic to predict. Seismic data interpretation and evaluation for hydrocarbon. This course teaches how to evaluate seismic attribute sections to enhance.
Dhis are mainly common in relatively young, unconsolidated siliciclastic sediments that have large impedance. Pdf on jan 1, 20, joseph ebeniro and others published dhi analysis using seismic attributes find, read and cite all the research you. Recent studies of lowfrequency passive seismic survey or called direct hydrocarbon indicator dhi in the range of frequency of 26 hz indicates that the frequency content of the seismic background noise changes over the reservoir of hydrocarbons 2, 3, 5, 10. The anomalies were on the opposite side of the fault from the dry well but on the same side of the fault as the original discovered reservoirs, thus. Understanding attributes and their use in the application of. Well data required for interpretation are wireline logs gamma ray logs, resistivity logs, porosity log, sonic logs, density logs and neutron logs or equivalent rock property model, check shot data. Classification of seismic attributes the seismic attributes are classified basically into 2 categories. A key technology employed in evaluating potential dhi features is seismic attributes. These anomalies were deeper than any penetrated interval in the field and below what was thought of as the dhi floor or the limit of our dhi detection. Seismic attributes reveal information, which are not readily apparent in the raw seismic data.
Offshore niger delta article pdf available in petroleum and coal 576. Dhi analysis using seismic frequency attribute on fieldan niger delta, nigeria. Pdf lithostratigraphic interpretation and seismic attributes. Direct hydrocarbon indicator mapping, offshore nova scotia project. Seismic attributes a promising aid for geologic prediction. Amplitude is often found to correlate strongly with porosity andor liquid saturation oilwater vs. Preconditioning of seismic data with 5d interpolation for computing geometric attributes, published in seg the. A method of locating subsurface hydrocarbon reservoirs includes acquiring seismic data, extracting seismic data attributes from the seismic data, calculating exemplar data group probability density function values using distribution values associated with the seismic attributes and applying bayesian inversion to determine the likelihood of subsurface hydrocarbons. The most common attribute is simply amplitude, although its interpretation in thinlayered beds is not necessarily straightforward. Extracting meaningful information from seismic attributes, published in canadian discovery journal.
Seismic attributes were introduced as a part of the seismic interpretation in early 1970s. The empirical mode decomposition emd algorithm is a. Matching pursuit algorithm for the spectral decomposition was adopted for frequency attributes analysis at 10hz to 35hz. Interpretation of 3d seismic volumes can involve a variety of analytical techniques ranging from mapping, visualizing and. Here are the papers that we published on seismic attributes in general. Petrelsoftware of schlumberger company is a worldwide software deals with seismic data. Interpretation of dhi characteristics with machine learning. Matching pursuit algorithm for the spectral decomposition was adopted for. In this context, avo and sd attributes are introduced as direct hydrocarbon indicators dhi, their successful implementations and. But no matter how new and sophisticated the algorithm, seismic pattern recognition rests on an old and simple foundation. Seismic attributes fall into two broad categories those that help us quantify the morphological component.
Because the seismic attributes that went into this som analysis are avorelated attributes that enhance dhi features, these lowprobability zones are interpreted to be associated with the yegua hydrocarbonbearing sands. They occur due to a change in pore fluids, which cause a change in the bulk rocks elastic properties. Hundreds of seismic attributes have been developed in an effort to derive more information from the original seismic amplitude data and further improve dhi interpretations. Broadly, geophysicists recognize several types of dhi. This can help guide the initial selection of attributes and will certainly help with interpreting the resulting data. If the address matches an existing account you will receive an email with instructions to reset your password. A machine learning workflow incorporating seismic attributes, pca, and som, has been proven to produce excellent results in the interpretation of dhis. Seismic attributes are any measurable property of seismic data including stacked or prestack data. A seismic dhi is defined as an anomalous seismic attribute or pattern that could likely be explained by the presence of hydrocarbons. Seismic data interpretation 104 multiattribute seismicguided logproperty mapping seismic attributes can be used for mapping of log properties by finding the interrelationships between logs and seismic data at tie points multiattribute linear regression artificial neural network techniques training the seismic to predict.
The stacked seismic data volume is commonly used for interpretation of geologic structure and seismic attributes. A hydrocarbon indicator hci or direct hydrocarbon indicator dhi, is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir dhis are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells. The anelastic attenuation factor or q is a seismic attribute that can be determined from seismic reflection data for both reservoir characterisation and advanced seismic processing. Avo analysis amplitude variation with angle or offset ava avo behaviour in prestack seismic gathers is a classic direct hydrocarbon indicator dhi based on the principle that variations in amplitude of a seismic reflection with angle of incidence or sourcereceiver distance offset are caused by fluid andor lithology changes in the reservoir. Evaluate seismic attribute sections to enhance conventional seismic interpretation. The hampsonrussell attributes package provides a variety of frequency attributes for spectral analysis, from standard instantaneous frequency attributes, widely used shorttime fourier transforms and wavelet transforms to advanced empirical mode decomposition methods. Level of petroleum investigation all 2 geophysics and reservoir management ew 3 fields discovery, delineation and development problem ew 4 dhi and seismic pitfalls ew 5 seismic attributes bn 6 seismic inversion.
Understanding the seismic disorder attribute and its applications, published in segthe leading edge. Seismic attribute analysis for reservoir characterization. Initially, 18 instantaneous seismic attributes were generated from the 3d data in this area see table 2. Hybrid cellular seismic telemetry system a solution to the industrys profit and data.
Seismic attributes provide the seismic interpreter with new images that can enhance both the physical and geometric descriptions of the subsurface. Unsupervised neural analysis of seismic attributes has been shown to be effective in understanding. Causes and appearance of noise in seismic data volumes, published in aapg explorer 20. Seismic attributes in geological interpretation aapg wiki. Jul 06, 2014 seismic attributes were introduced as a part of the seismic interpretation in early 1970s any information of interest that can be derived from seismic is seismic attributes 3. Since their introduction in the early 1970s, complex seismic trace attributes have gained considerable popularity, first as a convenient display form, and later, as they were incorporated with other seismicallyderived measurements, they became a valid analytical tool for lithology prediction and reservoir characterization. Identify the seismic effects of a bright spot anomaly and their physical cause. Seismic attributes and direct hydrocarbon indicators dhi contact ihrdc sales for corporate purchases add to cart price.
Seismic attribute analysis for reservoir characterization mohammad anees summary seismic attributes can be important qualitative and quantitative predictors of reservoir properties and geometries when correctly used in reservoir characterization studies. Principal component analysis and selforganizing maps 12 november 2015 seismic interpretation below tuning with multiattribute analysis. This presentation explores the many categories of seismic attributes created in the last 20 years and their general use in an interpretation workflow. Seismic attributes and direct hydrocarbon indicators dhis. The efficiency of seismic attributes to differentiate.
Since then many new attributes were derived and computed. These seismic attributes were put into a pca evaluation to determine which produced the largest variation in the data and the most meaningful attributes for som analysis. Seismic attribute analysis involves extracting or deriving a quantity from seismic data that can be analysed in order to enhance information that might be more subtle in a traditional seismic image, leading to a better geological or geophysical interpretation of the data. Seismic attributes are the components of the seismic data which are obtained by measurement, computation, and other methods from the seismic data. Pdf dhi analysis using seismic attributes researchgate. In this course the students learn the theory and practical workflows needed for effectively using post stack seismic attributes in seismic interpretation. Extending the limits of technology to explore below the. A hydrocarbon indicator hci or direct hydrocarbon indicator dhi, is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir.
The meaning and use of some attributes can be quite straightforward. The complex seismic trace attributes are found in some instances to correlate with lithological changes and historically have been used to characterize hydrocarbon reservoirs. The first section of this chapter focuses principally on the definition of seismic attributes and their applications in reservoir studies from the literature. Direct hydrocarbon indicators dhis more properly thought of as seismic. Pdf dhi analysis using seismic frequency attribute on field. Dhis are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells.
Seismic data interpretation 104 multi attribute seismic guided logproperty mapping seismic attributes can be used for mapping of log properties by finding the interrelationships between logs and seismic data at tie points multi attribute linear regression artificial neural network techniques training the seismic to predict. May 15, 2017 a key technology employed in evaluating potential dhi features is seismic attributes. Seismic attributes and their applications in seismic. Some attributes such as similarity have open source and commercial versions. The course content covers the most common seismic attributes, discusses the theory, attribute management and visualization. Figure 2 shows a segment of a seismic section from a field in off s h o re west a f r i c a. Pdf on jan 1, 20, joseph ebeniro and others published dhi analysis using seismic attributes find, read and cite all the research you need on researchgate. The curvature measure is an indicator of attribute pdf. Seismic interpretation seismic attributes rock physics seismotectonics seismic stratigraphy geophysical prospect appraisal petroleum system modelling seismic dynamic reservoir characterization seismic reservoir monitoring seismic inversion evaluation of seismic data hydrocarbon exploration and production, limitations and pitfalls evaluation of. Since the mid nineties, extensions to multitrace attributes have become more popular. Principal component analysis and selforganizing maps. Most of these attributes are of commercial interest. Emerging and future trends in seismic attributes, published in seg the leading edge. In this context, avo and sd attributes are introduced as direct hydrocarbon indicators dhi, their successful implementations and limitations.
Seismic attributes for reservoir studies petrowiki. Seismic attributes when used as dhi, it has helped to know the hydrocarbon prospects directly on seismic sections. Seismic attributes analysis for reservoir characterization. Seismic attributes may highlight geological or geophysical effects, thus leading to a quicker analysis of the data. Seismic attributes can be computed on a trace, multiple traces, on an entire volume, over isolated windows, on a horizon, and in either time or depth. Dhi analysis using seismic frequency attribute on fieldan. Ranking dhi attributes for effective prospect risk assessment. The pca reduces a large set of seismic attributes to indicate variations in the data, which often. Avo intercept, avo gradient, intercept multiplied by gradient, far minus near, fluid factor, etc. Understanding attributes and their use in the application. Seismic interpretation an overview sciencedirect topics.
Geometric attributes help define the structural and stratigraphic framework of the seismic interpretation, while physical attributes may be useful as direct hydrocarbon or lithologic indicators. Consider the geological feature you are hoping to interpret and how varying that aspect of the geology might affect the seismic data. Practical seismic attributes with petrel in this course the students learn the theory and practical workflows needed for effectively using post stack seismic attributes in seismic interpretation. Examples of seismic attributes can include measured time, amplitude, frequency and attenuation, in addition to. Examples of attributes that can be analysed include mean amplitude, which. Application of 3d seismic attribute analyses for hydrocarbon. Action learning seismic attributes and direct hydrocarbon indicators dhi. A seismic interpretation study should access the following data sets 2d or 3d seismic data cube.
The advanced seismic attributes analysis a seismic attribute is any measure of seismic data that helps us better visualize or quantify features of interpretation interest. Detailed information about the open source version is given in the attribute name link while more information about the commercial version can be found under the dipsteered attribute name link. Effect of hydrocarbon gas on the seismic frequency attributes was studied and considered for applicability as direct hydrocarbon indicator dhi in the an reservoir in the niger delta basin. In the early works, seismic attributes were to a large degree limited to capture 1d effects occurring along the vertical seismic trace. It includes a comprehensive package of seismic attributes used in hydrocarbon reservoir modeling in order to decrease the uncertainty and also to substitute the lack of the available seismic data sheline, 2005, azevedo and pereira, 2009. The course content covers the most common seismic attributes, discusses the. In reflection seismology, a seismic attribute is a quantity extracted or derived from seismic data that can be analysed in order to enhance information that might be more subtle in a traditional seismic image, leading to a better geological or geophysical interpretation of the data. Confidence in the accuracy of dhi identification can be increased by modelling 2 summary of hydrocarbon indicators after brown 1991 interpretation of 3d seismic data aapg memoir 42 i structural crest of against a fault trapping location ii local increase in amplitude bright spot.
Seismic attributes in hydrocarbon reservoirs detection and. This approach constitutes an integration of seismic geomorphology i. Ranking dhi attributes for effective prospect risk. Geologic pattern recognition from seismic attributes. A seismic dhi is defined as an anomalous seismic attribute or pattern that could likely be explained by the presence of. Direct hydrocarbon indicators dhis are an anomalous type of seismic amplitude that may occur due to the presence of hydrocarbons. Well data are gotten from rock samples and measurements at depth from a wellbore.
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