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Utilizing high-frequency 4-C downhole drillbit accelerometers to obtain mechanical rock properties in a series of controlled laboratory experiments. Charlie Waltman and James Lakings. Preview Abstract Validating critical assumptions with detailed laboratory study under controlled conditions is paramount to proving a concept in any scientific discipline.

The evolving science of drillbit geomechanics, that is measurements of elastic rock properties taken Introduction of the coil-type complex resistivity spectrum logging method. Preview Abstract A method named complex resistivity spectrum logging is proposed based on interfacial polarization IP. This logging method could be applied in evaluation of low resistivity of reservoir comparing with conventional alternating current logging method.

Numerical simulation of the magnetic cement induction response in the borehole environment. Timofey Eltsov and Tadeusz W. Preview Abstract We present a technique for the detection of integrity of the magnetic cement behind resistive fiberglass casing. Numerical simulations show that an optimized induction logging tool allows one to detect small changes in the magnetic permeability of cement Missing well-log data prediction using Bayesian approach in the relative-geologic time domain.

Preview Abstract We propose a method to estimate missing sonic logs using Bayesian estimation in the relative geologic time domain. In this approach, we first use local similarity to estimate alignment shifts to stratigraphically correlate several well logs to the Identification and characterization of natural fractures in gas shale reservoir using conventional and specialized logging tools. Preview Abstract For the quantification of fractures in shale, several methods have been proposed from laboratory data and well logs analysis.

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However, challenges are still remained for the identification and characterization of natural fractures in shale reservoir. Triaxial induction tool response in dipping and triaxially anisotropic formations. Preview Abstract Over the years, triaxial induction tools have found applications in not only determining resistivity anisotropy and dip of formations, but also in detecting fractures. When fractures are developed in a formation, the formation can exhibit triaxially Porosity prediction and application with multiwell-logging curves based on deep neural network.

Preview Abstract Accurate calculation of reservoir porosity is the key to geological interpretation and petroleum exploration decision. Porosity is influenced by various geological factors such as buried depth, tectonic position, sedimentary environment, lithologic change Using geophysical well logs to evaluate the mechanical parameters of a turbiditic reservoir in Campos Basin, southeast Brazil.

Lais Monteiro and Abel Carrasquilla. Preview Abstract The field of the geomechanical properties of the rocks is a very significant work in oil field operations, such as reservoir characterization, drilling, completion and production monitoring. For such reason, this study focuses on deriving these parameters Automatic detection of reflectors and their local dips from borehole acoustic array data. Anna Przebindowska and Tim Geerits. Preview Abstract Modern borehole acoustic array data can provide high-resolution, sub-seismic scale images of geological features up to about hundred feet away from the borehole.

However, interpretation and automatic feature extraction from these images is rather Simulation study of simultaneous anisotropy inversion method. Preview Abstract The simultaneous inversion method for obtaining formation shear-wave anisotropy parameters is widely used based on the four-component dipole acoustic data. The method combines the information of the fast and slow principal waves and the auxiliary waves Wellbore integrity investigation using seismic tube-wave and time-domain reflectometry: Laboratory modeling.

Preview Abstract Integrity of boreholes is key to subsurface resource extraction, energy storage, and waste disposal. Monitoring the integrity of a well is challenging due to the inaccessibility, high cost, and the complex of the subsurface condition. In this study, we An imaging method utilizing PGNAA gadolinium prompt gamma to determine propped fracture parameters and its application.

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Preview Abstract The ability of induced fractures to improve well production is dependent upon three primary characteristics of the fracture geometry: fracture height, fracture width, and fracture length. These methods containing micro-semic, acoustic, temperture logging Transdimensional Bayesian inversion for directional resistivity logging while drilling data. Preview Abstract Real-time geosteering technology plays a key role in horizontal well development, which keeps the wellbore trajectories within target zones to maximize reservoir contact.

Deep-directional-resistivity logging while drilling LWD tools have longer Detection of conductive fluids associated with hydraulic fracturing using surface based CSEM: Steel casing effects. Matthew Couchman and Mark E. Here we explore the capability of controlled source electromagnetic CSEM methods to detect Casing-integrity mapping using top-casing electrodes and surface based EM fields. Preview Abstract Among the most serious issues facing the oil and gas industry is the condition of older wells. In the US alone more than 1 million wells have mechanical or corrosive degradation of the well completion, resulting in mechanical instability and potential Monitoring hydraulic-fracture volume using surface-to-borehole EM and conductive proppant.

Michael Hoversten and Christoph Schwarzbach. Preview Abstract Numerical forward and inverse simulations using measured electric and magnetic field noise spectra and actual deviated well casing geometries are performed. The simulations demonstrate that hydraulic fracturing using typical slurry volumes of electrically Daniele Colombo and Gary W.

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Preview Abstract A baseline surface-to-borehole CSEM survey was performed in a supergiant oil field in Saudi Arabia with the objective of monitoring the evolution of the waterfront around a vertical monitoring well. Several aspects were taken into consideration including Effects of completion design on electrically stimulated casing and its 3D response. Chester J. Weiss , Evan Um , and Michael Wilt. Preview Abstract To better understand the factors contributing to electromagentic EM observables in developed field sites, we examine in detail through finite element analysis the specific effects of casing completion design.

The presense of steel casing has long been Gary W. McNeice and Daniele Colombo. Preview Abstract A surface-to-borehole controlled source electromagnetic CSEM survey was acquired in a research well in the eastern province of Saudi Arabia to monitor waterfront movement in a supergiant oil field. The initial baseline CSEM survey was conducted in a Top-casing electric-source method for imaging hydraulically active fracture zones.

Preview Abstract We examine the detection and imaging sensitivity of surface electric field measurements over a 3D hydraulically active fracture zone HAFZ at depth when one end point of a surface electric dipole source is directly connected to a wellhead. Improved upscaling of steel-cased wells through inversion.

Christoph Schwarzbach and Eldad Haber. Preview Abstract Accurately simulating electromagnetic fields for oil reservoirs where conductive casings are present requires special care when building parameter models. Because casings and geological structures present in the reservoir occur at significantly different EM 2 — Theory August Data-driven initial-model estimation with application to marine CSEM data. Rune Mittet and Lodve Berre. Preview Abstract Initial model estimation can be fully data driven. Normally only one inversion run is required to achieve a good estimate for a smooth initial model with this approach.

The scheme saves the operator in charge of the processing from repeated tests to find Time evolution of the electric field: Part 1 — Using the rapid expansion method REM with pseudospectral evaluation of spatial derivatives. Paul L. Stoffa and Anton Ziolkowski.

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Preview Abstract We present a method for modeling transient EM data acquired on land or at sea. We use the rapid expansion method REM to develop the 3-component electric wave field time response from the spatial responses found using a pseudo-spectral method. Robust optimal synthetic aperture imaging of towed streamer electromagnetic data. Xiaolei TU and Michael S. Preview Abstract The synthetic aperture SA method has recently found applications in analysis of the low frequency marine controlled source electromagnetic data. It has been shown in numbers of publications that SA method can enhance the response from an anomalous Practical methods for model uncertainty quantification in electromagnetic inverse problems.

Randall L. Mackie , Federico Miorelli , and Max A.

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  5. Preview Abstract Geophysical inverse problems are non-unique. Through regularization and the use of a priori information we can derive stable and geologically reasonable inversion models. Providing an analysis of the model uncertainty is necessary for the critical task of Guided fuzzy c-means clustering inversion of electrical potential due to an anisotropic-layered half-space.

    Joseph Capriotti and Yaoguo Li. Preview Abstract Most geophysical properties have a directional dependence, or anisotropy, that affects our measurements. However, this is still not commonly taken into account in inversions. Here we develop a clustering inversion method for a layered anisotropic Preview Abstract The grounded electric source airborne time-domain electromagnetic GREATEM method has recently undergone a number of advances, including development of tools that can produce large source moments and hence allow for large transmitter—receiver offsets and Location-based parameterization of CSEM data inversion for the monitoring of hydraulic fracturing with magnetically enhanced proppants.

    Preview Abstract We developed a particle mapping PM method which optimizes the location of each particle using a priori information on the susceptibility-volume product as a constraint. This PM method was applied to the imaging of magnetically enhanced proppants for Jones , Alan D. Chave , Shane F. Evans , and Jessica Spratt. Such systems allow more rapid acquisition compared to standard magnetotelluric MT approaches. Instead of EM 3 — Applications August Daniil V. Shantsev , Elias A.

    Nerland , Amir Babakhani , and Leiv J.


    Preview Abstract Repeatability of acquisition parameters for the base and monitor surveys is an important consideration for time-lapse studies of hydrocarbon reservoirs using controlled-source electromagnetics CSEM. Variations in parameters such as source and receivers Identification of geothermal reservoirs from ensemble-based Bayesian inversion of 3D MT data. Svenn Tveit and Trond Mannseth. Preview Abstract We consider the problem of identifying geothermal reservoirs in an exploration setting utilizing information from transient electromagnetic TEM and magnetotelluric MT data. The inversion methodology proposed uses information about the conductive clay Magnetotelluric imaging for exploration in fold-and-thrust belt settings: A feasibility and case study.


    Rita Streich and Akshat Abhishek. Preview Abstract We investigate the potential of magnetotelluric MT imaging to aid exploration activities in fold-and-thrust belt settings. While MT is known to be sensitive to electrically conductive structures, here we examine resolution capabilities for strongly MT modeling and inversions for the Bolivian foothill exploration, from unconstrained to constrained, from 2D to 3D.

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    Correa and Paulo T. In the present article, we report the 3D CSEM finite—difference time domain forward study to generate Marine self-potential and controlled-source EM measurements using an autonomous underwater vehicle. Preview Abstract Using an autonomous underwater vehicle AUV equipped with a three-axis electric field receiver we were able to make measurements of self potential SP fields over a hydrothermal prospect in the Iheya area of the Okinawa Trough, southwest of Japan.