... faults, subducting front, complex accretionary wedge and the paleo-prism acting as a backstop. In particular we are able to image in great detail the complex deformation associated to the subduction of seamounts. We perform waveform and ray modeling in the FWI velocity model to analyse wave propagation...

... anomaly basement relief seg international exposition inversion rectangular prism padding prism Inversion of gravity anomaly for basement relief estimation Federico Golfré Andreasi, Simone Re* and Stefano Scandroglio, Schlumberger Summary Despite these significant improvements, gravity inversion...

... prisms to approximate the shape of the geological source. Each prism has a known homogeneous magnetization and an unknown polygon as its horizontal cross-section. The vertices of the polygons approximate the horizontal depth slices of the source. The method estimates the horizontal coordinates...

...-shaped conductor can be constructed in the model. Our remedy is to warm-start the inversion by a conductor-seeded initial model in conjunction with a uniform reference model. We find that initial models can be as simple as a vertically infinite conductive prism of a conductivity and width roughly guessed...

... parameter b varies from 0 to ND (where N is the number of signal data, D is the sampling step); the wavenumber k was chosen as: + . In this way, first we analyzed the case of a single prism, whose top and bottom depth is varied. According to the Spector and Grant s method (Spector and Grant, 1970) we...

... upstream oil & gas prism gravity data sediment annual meeting reservoir characterization anomaly seg seg international exposition salt base delineation gravity anomaly geophysics density contrast inversion efficient inversion thickness salt body representation...

... technique is applicable to gravity and gravity gradient observations made on land, in air, and at sea. We demonstrate the technique using field examples that cross both land and water. Presentation Date: Tuesday, September 26, 2017 Start Time: 2:15 PM Location: 360C Presentation Type: ORAL prism...

... magnetization mapping magnetization magnetic layer remanent magnetization multilayer apparent magnetization mapping reservoir characterization geophysics annual meeting magnetization mapping upstream oil & gas prism mapping magnetization distribution Blakely , R. J. , 1995...

... basement relief application grid gravity inversion structural geology node lanczo bidiagonalization method iteration geophysics equation upstream oil & gas anomaly inversion prism parallelization sedimentary basin matrix reservoir characterization regularization parameter...

... Summary We develop a new tool for initial seismic migration-velocity model building based on a recent gravity inversion method. This method consists of an iterative algorithm that provides a 3D density-contrast distribution on a grid of prisms, the starting point being a user-specified...

... with the integral equation solution of Farquharson and Old- enburg (2002) and the physical scale modeling of Duckworth and Kerbes (1997). The first example presented here is for a long grounded wire source and a model with a more conduc- tive prism buried in an otherwise conductive half space. The second example...

...-dimensional gravity inversion method upstream oil & gas modeling inversion complex area observation point reservoir characterization prism coefficient set forward modeling gravity anomaly Application of a three-dimensional gravity inversion method constrained with density in complex areas...

... curve shape, but be offset from it. inversion upstream oil & gas inverse model information magnetic body magnetic susceptibility constraint aeromagnetic data core log information borehole inverse modeling line 21 seg houston 2013 prism susceptibility anomaly petrophysical data...

.... In the approach, the subsurface structure is discretized to a set of rectangular prisms. For estimating the density and magnetization of each prism, we minimize the quadratic norm of the residuals between the observed and the forward-modeled. Two regularization terms are used in our joint inversion. We also...

... SUMMARY We present an improvement to the method of 3D gravity gradient inversion by planting anomalous densities. This method estimates a density-contrast distribution defined on a grid of right-rectangular prisms. Instead of solving large equation systems, the method uses a systematic search...

... ABSTRACT We present a new gravity gradient inversion method for estimating a 3D density-contrast distribution defined on a grid of prisms. Our method consists of an iterative algorithm that does not require the solution of a large equation system. Instead, the solution grows systematically...

... ABSTRACT We present a new 3D gravity-inversion approach that retrieves the geometry of an isolated geologic source with known density contrast and depth of the top. We approximate the source by an interpretation model formed by an ensemble of vertically juxtaposed right prisms whose horizontal...

... distribution defined on a grid of prisms. This inversion approach combines robust data-fitting with an iterative procedure that does not require the solution of a large equation system. By using a systematic search algorithm, the estimated mass grows around prismatic elements called “seeds”. The interpreter...

... conductive and re- sistive prisms. This illuminates how locations of the anoma- lous body and survey design impact the ISR responses. Ad- ditional forward modelings can be used to identify the under- ground space illuminated by an ISR survey and the sensitivity of E-field measurements to a deep resistive...

... regularization basin prism total variation regularization reservoir characterization sedimentary basin Total-variation regularization for depth-to-basement estimate Cristiano M. Martins, ON, Williams A. Lima, UFPA, Valéria C.F. Barbosa*, ON, and João B.C. Silva, UFPA. Summary We present an inversion...