...’ resistivities and densities. The parameters are estimated by minimizing the statistical misfit between the simulated and the observed measurements for several logs on different scales simultaneously (i.e., shallow-sensing nuclear density and shallow to extra-deep electromagnetic (EM) logs). Numerical...

...Frank Antonsen; Berit Ensted Danielsen; Kåre Røsvik Jensen; Marta Prymak-Moyle; Jon Kåre Lotsberg; Maria Emilia Teixeira De Oliveira; Monica Vik Constable Equinor has played an important role in the last decade in the testing and development of ultradeep azimuthal resistivity (UDAR) measurements...

...Supriya Sinha; Arthur Walmsley; Nigel Clegg; Brígido Vicuña; Hsu-Hsiang (Mark) Wu; Andrew McGill; Téo Paiva dos Reis; Marianne Therese Nygård; Gunn Åshild Ulfsnes; Monica Vik Constable; Frank Antonsen; Berit Ensted Danielsen With the introduction of ultradeep azimuthal resistivity (UDAR) logging...

...John Bergeron; Michael Rabinovic; Murad Murtuzaliyev; Andy Ronald; Elnur Binyatov Proactive geosteering, landing, geostopping, geomapping, and look-ahead (LAH) applications of ultradeep azimuthal resistivity (UDAR) tools are becoming more common in operator new well delivery practices. In very...

...Kyubo Noh; Carlos Torres-Verdín; David Pardo We develop a deep-learning (DL) inversion method for the interpretation of 2.5-dimensional (2.5D) borehole resistivity measurements that requires negligible online computational costs. The method is successfully verified with the inversion of triaxial...

... characterization fraction evaluation gr cc posterior probability hydrocarbon saturation calculation resistivity well oblz-1 well 15 mineral zone application saturation granularity equation glauconite PETROPHYSICS, VOL. 63, NO. 4 (AUGUST 2022); PAGES 534 548; 3 FIGURES. DOI:10.30632/PJV63N4...

... 2022, Society of Petrophysicists & Well Log Analysts upstream oil & gas structural geology log analysis facies well logging artificial intelligence machine learning pearl river mouth basin resistivity fracture reservoir characterization porosity interpretation den doi...

... the HROBMI are a function of the formation properties: resistivity and permittivity, frequency, and mud properties. The hybrid algorithm can untangle HROBMI data from multiple frequencies to obtain true formation resistivity images independent of the other parameters that affect the tool measurements...

... resistivities often seen in hydrocarbon-bearing intervals. There are a number of different techniques available to the petrophysicist for evaluating thin beds, including conventional “bulk volume” techniques, various types of high-resolution modeling, and different low-resolution modeling techniques, both...

...Michael Bittar; Hsu-Hsiang (Mark) Wu; Jin Ma; Li Pan; Yijing Fan; Matthew Griffing; Clint Lozinsky Electromagnetic (EM) resistivity tools measure the electrical properties of downhole formations that are critical in determining the hydrocarbon saturation of a reservoir. In complex and heterogeneous...

... of the proactive geosteering with azimuthal resistivity measurements and multilayered user-guided inversion used in this project. The prewell study based on multiple offset wells is discussed in detail, followed by presenting the highlights of the real-time drilling/geosteering operations, and concluded...

...Ting Li; Nicholas Drinkwater; Karen Whittlesey; Patrick Condon In this paper, we examine fluids interpretation techniques in a prolific oil field in offshore West Africa. A sourceless logging program, consisting of logging-while-drilling (LWD) nuclear magnetic resonance (NMR), resistivity...

...Nigel Clegg; Endre Eriksen; Kevin Best; Ingeborg Tøllefsen; Artur Kotwicki; David Marchant Electromagnetic (EM) inversion processing of ultradeep resistivity data has advanced from one dimensional (1D) to three dimensional (3D). These advances have helped improve the geological complexity that can...

... to determine parameters of the virgin formation and invaded zone accurately. log analysis BKZ sandstone Upstream Oil & Gas Vemkz well logging typical western siberian reservoir environment Artificial Intelligence numerical simulation petrophysics february 2020 boundary resistivity electrode...

...Zhiying Liu; Baiqiao Zhang; Chengguang Zhang; Wei Xu; Xi Kang; Chengwen Xiao Array induction tools are widely used in resistivity logging. In an anisotropic formation, variations of the angles between the well axis and the formation normal vector tend to have a visible effect on these induction...

... sensing technologies used for geosteering, which include gamma-ray, neutron density, and EM resistivity, resistivity measurement is preferred since it provides large depth of investigation (DoI). An EM resistivity tool takes the measurement of earth s electrical properties by propagating...

... of ε at multiple frequencies ( f ), also known as dispersive permittivity ( ε ( f )). Drawbacks with these tools are that they respond to the invaded zone and the data must be acquired on wireline and therefore is not always accessible. Logging-while-drilling (LWD) propagation resistivity records...

... porosity Artificial Intelligence clay content intersection point geophysics Reservoir Characterization Upstream Oil & Gas gas-hydrate-bearing sediment interpretation sediment hydrate saturation joint interpretation prediction electrical data saturation resistivity 854 PETROPHYSICS...

... & Gas porosity storage capacity resistivity TOC Organic Mudstone Petrophysics, Part 2: Workflow to Estimate Storage Capacity Kent Newsham1, Joe Comisky2, and Roland Chemali1 This is the second of a three-part tutorial describing a workflow for evaluating unconventional resources including organic...

...David Kennedy; Fredy Garcia Prologue The standard model for relating bulk formation resistivity to porosity and water saturation was introduced to the petroleum industry in 1941; it remains the industry standard to this day. The model was discovered empirically by means of graphical analysis...