Simultaneous multiple wellseismic ties using flattened. The well tie process utilizes two key jason applications that work together. Seismic design specification for buildings, structures. Petrel well tie manual free ebook download as pdf file. The quality of seismictowell tie is commonly quantified using the classical pearsons correlation coefficient.
Margrave summary tying seismic data to well control is a crucial step in seismic inversion and interpretation. Access comprehensive seismictowelltie tools as well as flexible and robust velocity modeling capabilities. To obtain the optimal phase for wavelet and time shift for seismic well tie, we usually need more than 10 times manual the seismic well tie and phase scanning of the seismic. Global method for seismicwell tie based on realtime. Rockphysicsassisted welltie analysis for structural. Synthetic seismograms can be created by doing basic calculus on traveltime functions.
The optimum wavelet is determined to be that which, when convolved with well log reflectivities, results in a synthetic that best matches the input seismic in a leastsquares way. Seismic well tie is a critical process to verify accuracy of timedepth relationship. Global method for seismicwell tie based on real time synthetic. Petrel seismic well tie enables interactive checkshot calibration of sonic log data, analytical wavelet creation, statistical and deterministic wavelet extraction, and synthetic seismogram generation for 2d. The prerequisite for a close tie between a well log synthetic seismogram and a seismic data volume are accurate sonic and density logs and good quality seismic. In the solution for the exercise, show the well tie for the barracouta1 well. Wellseismic tie incorporated research institutions for. Global method for seismicwell tie based on real time synthetic model. The deterministic well tie methods require that a well tie already exists, while the statistical method extracts an average wavelet from a speci.
Upper plot shows the manual seismictowell tie, the correlation of this tie was 80 %. Launch the wellseismic tie window from the main menu or, optionally, the wellseismic tie window can be launched from the tree. This step is very important for any analysis that uses seismic and well data together. Pdf global method for seismicwell tie based on real time. The exercise is a wellseismic tie from an area onshore the united states. Understand seismic response in respect to the wells. Sensitivity of seismic well ties to attenuation effects ntnu open.
This well tie is not simple, hence the switch of study area. Reliable wellseismic tying is a crucial step in seismic interpretation to correlate subsurface geology to ob served seismic data. Video tutorial interpretasi seismik menggunakan software hrs 10. Tying seismic data to well control is a crucial step in seismic inversion and interpretation.
One way of looking at the well tie is that it is the interpreters chance to conduct an experiment to test the connection between the geology and the seismic data. Welltoseismic tie of amangihydrocarbon field of the niger delta of nigeria. Well data are gotten from rock samples and measurements at depth from a wellbore. Automated seismictowell ties using dynamic time warping roberto h. Welltoseismic tie and wavelet phase estimation are closely related steps that link geology and seismic data. Dont tie wells to 2d seismic lines you have not balanced yet, unless youre doing it as part of the process of deciding how to balance the seismic. This is where key ambiguities that prevent the interpretation of a seismic image as bandlimited reflectivity are resolved. Petrel seismic well tie enables interactive checkshot calibration of sonic log data, analytical wavelet creation, statistical and deterministic wavelet extraction, and synthetic seismogram generation for 2d and 3d seismic data. Seismictowell tie is a useful tool used to relate recorded seismic. Automatic approaches for seismic to well tying university of alberta. Simultaneous multiple wellseismic ties using flattened synthetic and real seismograms xinming wu1 and guillaume caumon2 abstract wellseismic ties allow rock properties measured at well. Integrated synthetic seismogram workflows unify, within the same canvas, the impact from the sonic calibration to the. Well tie analysis is a starting point for mapping facies and geology observed at well locations into seismic volumes.
Why well tying is difficult crewes research report volume 25 20 5 signature, w0, and q w is a nonstationary convolution matrix that applies the constantq impulse response. Seismic reflection data yields a 2d or 3d earth image based on large scale acoustic impedance contrasts and relatively low frequency content in time domain, whereas well logs. Recommended practice on well to seismic tie outline of the presentation. Second, since the wavelet that makes the tie is, in principle, known only at the well, any interpretation of the seismic data for stratigra phy between the wells or. A semiautomatic method to tie well logs to seismic data. Presentation of the interactive seismic to well tie, with a comprehensive comparison between synthetic model and real seismic. However the seismic wavelet is timevariant, well logging and upscaling is only. Based on a relative geological time model resulting from global seismic interpretation and on synthetic seismograms, this technique. Access comprehensive seismic to well tie tools as well as flexible and robust velocity modeling capabilities, bridging the critical gap between time and depth with petrel geophysics. Seismic to well ties with problematic sonic logs, by don. Welltoseismic tie of amangihydrocarbon field of the. Welltie analysis is a starting point for mapping facies and geology observed at well locations into. Manual seismictowell tie the forward model sonic log pwave vp well logs bulk density.
This process requires sonic transit time data which was acquired in most exploration and delineation wells. A synthetic seismogram is matched to a real seismic trace and features from the well are correlated to the seismic data. Providing precise velocity information, as well as true seismic wavelet welltie with phase, frequency, and timedepth, a zerooffset vsp is the only tool that can identify events target, over pressure, casing. Some wells in amangi field showing suite of logs in each well. The petrel seismic well tie module allows interactive checkshot calibration of sonic log data, analytical wavelet creation, statistical and deterministic wavelet extraction, and synthetic seismogram. Integrating slowness the reciprocal of velocity yields a timedepth relationship. Welltie analysis is a starting point for mapping facies and geology observed at well locations into seismic volumes. The purpose of this course is to introduce you to the existing workflows in the seismic well tie process. The prime concept in constructing the synthetic is the. Automated seismictowell ties using dynamic time warping. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel. Automatic approaches for seismic to well tying roberto h. Acoustic impedance i 1 1 i i i i i i i r i i reflectivity r computed statistical wavelet wavelet w.
Pdf this paper presents an original global method which computes a real time synthetic model from seismic data, during the welltie process. Usually these processes are solved separately or alternately, diminishing the quality. Comparison between deterministic and statistical wavelet. Dont create multiple, undocumented, obscurely named copies. Seismic interpretation an overview sciencedirect topics. Wavelets were extracted from two seismic well tie windows to check the stability of the wavelets with time. The tie in a deeper interval containing the reservoir was less. Use of machine learning to estimate sonic data for seismic. Seismic well tie and velocity modeling schlumberger. Pdf how to tie a well to seismic using commercial software find, read and cite all the research you need on researchgate. The well tie process making a well tie figure 2 is deceptively simple. The process of seismictowell tie involved mostly the comparison between the real seismic trace and the synthetic trace rob simm, 2014. A semiautomatic method to tie well logs to seismic data roberto h. Gc seismic to well ties with problematic sonic logs.
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