Hasanusi, D., Adhitiawan, E., Baasir, A., Lisapaly, L., van Eykenhof, R., "Seismic Inversion as an Exciting Tool to Delineate Facies Distribution in Tiaka Carbonate Reservoirs, Sulawesi – Indonesia", Proceedings, Indonesian Petroleum Association, Thirty-First Annual Convention and Exhibition, May 2007. Malaysia. When the estimated (constant) phase of the statistical wavelet is consistent with the final result, the wavelet estimation converges more quickly than when starting with a zero phase assumption. Call for papers Closed. Stochastic inversions address this problem by generating a range of plausible solutions, which can then be narrowed through testing for best fit against various measurements (including production data). These surveys record sound waves which have traveled through the layers of rock and fluid in the earth. Together these define the chances of a particular value at a particular location, and the expected geological scale and composition throughout the modeled area. A near-stack wavelet can be used as the starting point for estimating the far-angle (or offset) wavelet. The use of multiple-angle-stack seismic volumes in AVA geostatistical inversion enables further evaluation of elastic rock properties and probable lithology or seismic facies and fluid distributions with greater accuracy. Examination of vertical seismic profile (VSP) data with unsupervised machine learning technology is a rigorous way to compare the fabric of down-going, illuminating, P and S wavefields with the fabric of up-going reflections and interbed multiples created by these wavefields. Stephen, K., MacBeth, C., "Reducing Reservoir Prediction Uncertainty by Updating a Stochastic Model Using Seismic History Matching", SPE Reservoir Evaluation & Engineering, December 2008. Since a different wavelet is computed for each offset volume, compensation is automatically done for offset-dependent bandwidth, scaling and tuning effects. The AVA geostatistical inversion is then run to generate the desired number of realizations, which match all the input data. Sci., Vol. The simultaneous inversion algorithm takes multiple angle-stacked seismic data sets and generates three elastic parameter volumes as output. Wang, X., Wu, S., Xu, N., Zhang, G., "Estimation of Gas Hydrate Saturation Using Constrained Sparse Spike Inversion: Case Study from the Northern South China Sea", Terr. Each of these components can be inspected for its contribution to the solution and to check the results for quality. 242–256. Next, horizon and log data are used to construct the stratigraphic framework for the statistical information to build the models. Often a feasibility study using the wells logs will indicate whether separation of the desired lithotype can be achieved with P-impedance alone or whether S-impedance is also required. Further QC involves review by a multidisciplinary team of all input parameters and the results of the simulation. [5] High frequency can be derived from well control or geostatistical analysis. Kuala Lumpur. This approximate result is then improved in a final inversion for P-impedance, S-impedance and density, subject to various hard and soft constraints. Reservoir 3-D bodies of hydrocarbon-bearing units are captured with their corresponding rock properties, and the uncertainty in reservoir size and properties is quantified. Next, these are used with the full Zoeppritz equations (or approximations, such as Aki–Richards, for some algorithms) to find band-limited elastic reflectivities. CSSI transforms seismic data to a pseudo-acoustic impedance log at every trace. Geostatistical inversion integrates data from many sources and creates models that have greater resolution than the original seismic, match known geological patterns, and can be used for risk assessment and reduction. Zou, Y., Bentley, L., Lines, L., "Integration of Reservoir Simulation with Time-Lapse Seismic Modeling", 2004 CSEG National Convention. The results are quality controlled by direct comparison of the inverted rock property volumes against the well logs. AVA geostatistical inversion software uses leading-edge geostatistical techniques, including Markov chain Monte Carlo (MCMC) sampling and pluri-Gaussian lithology modeling. The algorithm also simultaneously produces elastic properties (P-impedance, S-impedance and density) and lithology volumes, instead of sequentially solving for lithology first and then populating the cell with impedance and density values. Well logs are first conditioned and edited to ensure there is a suitable relationship between impedance logs and the desired properties. Stay Connected - The EAGE Newsletter . Pendrel, J., Dickson, T., "Simultaneous AVO Inversion to P Impedance and Vp/Vs", SEG. Shallow Shear Wave Reflections: What Can the Amplitude Tell Us and How? The lowest frequencies from the inversion are replaced with information from the geologic model since they are poorly constrained by the seismic data. Without a wavelet, the solution is not unique. inversion first derives models of impedances (from the seismic) given facies, and then facies (from the 81st EAGE Conference & Exhibition 2019 3-6 June 2019, London, UK 5/6, 2006, pp. Geostatistical inversion integrates high resolution well data with low resolution 3-D seismic, and provides a model with high vertical detail near and away from well control. your email. Because of its efficiency and quality, most oil and gas companies now use seismic inversion to increase the resolution and reliability of the data and to improve estimation of rock properties including porosity and net pay.[3]. Mostly coming from user contributions, it is contextual and is meant for indicative purposes only. Latimer, R., Davison, R., van Riel, P., "An Interpreter’s Guide to Understanding and Working with Seismic-Derived Acoustic Impedance Data", The Leading Edge, March 2000, pp. When applied in global mode a spatial control term is added to the objective function and large subsets of traces are inverted simultaneously. 26-28 Oct. EAGE Workshop on Quantifying Uncertainty in Depth Imaging www.eage.org. Seismic Inversion with Deep Neural Networks: a Feasibility Analysis ... DOI: 10.3997/2214-4609.201900765. Seismic data is band-limited, reducing resolution and quality. Central Basin succession: Sedimentation patterns and controls, Constraining recycled detritus in quartz‐rich sandstones: Insights from a multi‐proxy provenance study of the Mid‐Carboniferous, Clare Basin, western Ireland, Reconstruction of the Cenozoic deformation of the Bohai Bay Basin, North China, Along‐strike structural linkage and interaction in an active thrust fault system: A case study from the western Sichuan foreland basin, China, Tidal amplification and along‐strike process variability in a mixed‐energy paralic system prograding onto a low accommodation shelf, Edgeøya, Svalbard, Cretaceous continental margin evolution revealed using quantitative seismic geomorphology, offshore northwest Africa, Interplay of eustatic, tectonic and autogenic controls on a Late Devonian carbonate platform, northern Canning Basin, Australia, Well Services Operations in Offshore Unmanned Platform; Challenges and Solutions, Constraining basin thermal history and petroleum generation using palaeoclimate data in the Piceance Basin, Colorado. Most often these are lithology or seismic facies cubes and predicted lithology or facies probabilities, but other outputs are also possible. This is especially useful when dealing with parameters that are sensitive to change; an analysis of this sort enables greater understanding of development risk. Individual PDFs are merged using bayesian inference techniques, resulting in a posterior PDF conditioned to the whole data set. Francis, A., "Limitations of Deterministic and Advantages of Stochastic Seismic Inversion", CSEG Recorder, February 2005, pp. Wavelet amplitude and phase spectra are estimated statistically from either the seismic data alone or from a combination of seismic data and well control using wells with available sonic and density curves. repeat email. Payment. This provides a rough overview of the reservoir in an unbiased manner. As a result, geoscientists are more successful in reconstructing both the overall structure and the fine details of the reservoir. Analysis of multiple realizations produces mean (P50) property cubes or maps. Uncertainty can be estimated using random seeds to generate a range of realizations. All modern seismic inversion methods require seismic data and a wavelet estimated from the data. Reflection coefficients are calculated from P-sonic, S-sonic and density logs using the Zoeppritz equations. The more advanced algorithms use the full Knott–Zoeppritz equations and there is full allowance for amplitude and phase variations with offset. Member of SPE, SEG and EAGE often run with relaxed constraints, starting with the seismic is... Of realizations, which is an ideal medium for an informal exchange of ideas and for discussions p-wave. 376 pages to P-impedance a final inversion for P-impedance, S-impedance and density logs using Zoeppritz. Inversion solves for S-impedance and density beyond the solution is not unique accurate P-sonic, and. 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