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Keywords: probability
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Journal Articles
Petrophysics 63 (04): 534–548.
Paper Number: SPWLA-2022-v63n4a4
Published: 02 August 2022
...Mirano R. Spalburg This paper presents a fast and transparent Bayesian-based computational method that can be used for the interpretation of well logs. Rather than single values for formation properties, the results are probability distributions. The method is fast because the responses of logging...
Journal Articles
Petrophysics 61 (01): 99–111.
Paper Number: SPWLA-2020-v61n1a4
Published: 01 February 2020
... the prior information and measurements, the Bayesian estimator can rigorously compute the joint posterior probability density function of the stratigraphic and tool-location variables. Due to the inherent nonlinearity of measurements and the non-Gaussianity of the random variables involved, we propose...
Journal Articles
Petrophysics 60 (04): 469–479.
Paper Number: SPWLA-2019-v60n4a1
Published: 01 August 2019
... Characterization neural network well-log correlation Pattern Recognition well logging Meramec petrophysics august 2019 deep cnn log motif interpreter seed well complexity correlation tool unconformity interpretation dataset iteration machine-learning-based approach probability 469 PETROPHYSICS...
Journal Articles
Petrophysics 60 (01): 113–135.
Paper Number: SPWLA-2019-v60n1a9
Published: 01 February 2019
... specifications, we calculate the probability of successfully initiating a fracture for a range of in-situ conditions and design options. Global sensitivity analyses are carried out to map the chance of success over this range. Finally, on test completion, we use test results to reduce the uncertainty space. We...
Journal Articles
Petrophysics 58 (05): 485–500.
Paper Number: SPWLA-2017-v58n5a3
Published: 01 October 2017
... petrophysics august 2017 probability natural gamma-ray tool count rate wireline tool API Formation August 2017 PETROPHYSICS 485 PETROPHYSICS, VOL. 58, NO. 5 (OCTOBER 2017); PAGE 485 500; 10 FIGURES; 2 TABLES Characterizing Natural Gamma-Ray Tools Without the API Calibration Formation1 Gordon L. Moake2...
Journal Articles
Petrophysics 58 (04): 376–396.
Paper Number: SPWLA-2017-v58n4a4
Published: 01 August 2017
... pressure gradient. Fewer pretests are needed to achieve the same level of certainty in a thicker interval relative to a thinner interval. Making one or two additional pretests does not have a high probability of reducing uncertainty. The potential of nonrepresentative measurement error, for a specific...
Journal Articles
Petrophysics 51 (03).
Paper Number: SPWLA-2010-v51n3a3
Published: 01 June 2010
... logging gmc method algorithm noise log analysis Upstream Oil & Gas amplitude machine learning optimization problem Monte Carlo decomposition inversion problem configuration petrophysics june 2010 clay-bound water probability nmr inversion problem June 2010PETROPHYSICS208 Monte...
Journal Articles
Petrophysics 43 (06).
Paper Number: SPWLA-2002-v43n6a2
Published: 01 November 2002
... petrofacies unit porosity application Upstream Oil & Gas correspondence condition coefficient log analysis formation factor mean value algorithm probability petrophysical objective data pair Validation Criterion standard error ambient condition equation PETROPHYSICS, VOL. 43, NO. 6...
Journal Articles
Petrophysics 43 (02).
Paper Number: SPWLA-2002-v43n2a1
Published: 01 March 2002
... network for the classification, and compare the success rates of the different methods. We find that the Mahalanobis discriminant analysis (MLDA), the probability density function (PDF) classification, and the neural network (NN) classification all have a "SUCCCSS rate" of about 80% when we use sonic...
Journal Articles
Petrophysics 39 (02).
Paper Number: SPWLA-1998-v39n2a2
Published: 01 March 1998
...Alaa Ibrahim Ali; Upmanu Lall Markov chain models are often used to represent subsurface stratigraphy and to simulate likely representations of the subsurface. The data used are cores or boreholes. Rock types are classified into a finite set of states, and a state transition probability matrix...
Journal Articles
Petrophysics 38 (03): 62–70.
Paper Number: SPWLA-1997-v38n3a3
Published: 01 May 1997
..., with a median probability of saving $21,000. The wells were drilled with MWD replacing wireline with total cost savings of over $240,000 for the project. The DA on the second project indicated that there was virtually a 100% chance of not realizing any cost savings, and that we could incur additional costs...
Journal Articles
Petrophysics 36 (03).
Paper Number: SPWLA-1995-v36n3a2
Published: 01 May 1995
... geology. 1 5 1995 1 5 1995 1995. Society of Petrophysicists & Well Log Analysts log analysis Thickness correlation matrix nonreservoir well logging Efficiency log analyst may-june 1995 interpretation Upstream Oil & Gas information histogram probability separation...
Journal Articles
Petrophysics 35 (01).
Paper Number: SPWLA-1994-v35n1a1
Published: 01 January 1994
... analyst facies sequence principal component analysis agreement determination probability Doveton facies relationship diagram application matrix Discriminant analysis Some Applications of Methods Used in Electrofacies Identification Jose Alberto Bucheb: Petrobras, Rio de Janeiro, Brazil...
Journal Articles
Petrophysics 24 (03).
Paper Number: SPWLA-1983-vXXIVn3a3
Published: 01 May 1983
... different ranges or zones of values. By considering the layer-wise or point-wise known well log values as probabilistic variables it can be determined, on the basis of their measured values and scatter, what is the probability that they belong to the individual zones. A weight matrix is introduced, based...

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