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Keywords: Computation
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Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0103
... in local minima. algorithm converges. In our implementation we apply five possible ways to construct candidate model on To make the algorithm more computationally effective, basis of current model by making a single change in we perform inversions using multiple CPUs, which either the model s geometry...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5061
... of an oil lead in a nearby field. Important reservoir properties are measured through-casing and combined to compute porosity and mineralogy. Water saturation estimation done using porosity, mineralogy and measured sigma values is compared to oil saturation computed from total organic carbon (TOC) direct...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-GG
... layer with conventional pores. While-drilling two independent proxies were applied to assess the thermal maturity. Kerogen maturity from DRIFTS was 0.6 to 0.7% vitrinite reflectance equivalence (VRE), and maturity computation from mud gas ratios using AMGL indicated ~0.5–0.8% VRE, both implying early...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-UU
... used to invert echoes to T2 distribution and subsequently porosity. Higher porosity sensitivity to fast T2's is desirable in shaly sands to compute accurate porosity but is affected by the minimum echo spacing. To overcome this limitation, a novel technique called "Fast Relaxation Enhancement (FaRE...
Proceedings Papers

Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-82643
... facies derived from the images through image character with the openhole log data. By using of textural analysis from images to refine computation of permeability in a variety of reservoirs, inferred grain size variations can be directly related to flow unit permeability in horizontal (kh) and vertical...
Proceedings Papers

Paper presented at the SPWLA 50th Annual Logging Symposium, June 21–24, 2009
Paper Number: SPWLA-2009-37700
... We present an improved multiple-shot processing algorithm for array sonic waveforms. The existing multiple-shot algorithm projects the ST plane computed from subarrays onto the slowness axis prior to stacking. Projection eliminates the time-shift uncertainty among the subarrays that results from...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-TT
.... The magnitude of the dip is directly computed from the amplitude of the corresponding sinusoid. One source of uncertainty in this seemingly simple calculation is the so-called "Depth of Investigation." Simply put, borehole images do not originate at the borehole wall, but somewhat deeper, inside the formation...
Proceedings Papers

Paper presented at the SPWLA 47th Annual Logging Symposium, June 4–7, 2006
Paper Number: SPWLA-2006-YYY
... Borehole size and shape characterizations are needed in order to apply the proper borehole corrections for Logging While Drilling (LWD) measurements. They are also needed in real time for cement volume computations and geo-mechanical wellbore stability ap real time system mud density...
Proceedings Papers

Paper presented at the SPWLA 46th Annual Logging Symposium, June 26–29, 2005
Paper Number: SPWLA-2005-CCC
... Knowledge of mineralogy and clay is fundamental for accurate formation evaluation. In clastics reservoirs, clay characterization from logs is critical because this influences the computation of important petrophysical properties such as porosity, permeability and water saturation...
Proceedings Papers

Paper presented at the SPWLA 43rd Annual Logging Symposium, June 2–5, 2002
Paper Number: SPWLA-2002-OO
... greater resolution than previously possible, and update these models while the well is being drilled. Artificial Intelligence lateral correlation Computation interpretation Directional Drilling marker surface borehole geometry wellbore Reservoir Characterization Upstream Oil & Gas...
Proceedings Papers

Paper presented at the SPWLA 43rd Annual Logging Symposium, June 2–5, 2002
Paper Number: SPWLA-2002-YY
... logging total porosity water saturation log analysis Taratunich field porosity dolomite carbonate intercalation Computation Upstream Oil & Gas correlation secondary porosity Symposium fracture complex carbonate wettability spwla 43 saturation Mexico reservoir lithology SPWLA 43...
Proceedings Papers

Paper presented at the SPWLA 41st Annual Logging Symposium, June 4–7, 2000
Paper Number: SPWLA-2000-GGG
... are demonstrated for both examples and are shown to produce results that are consistent with production. log analysis time domain analysis Computation knowledge management calculation Carbonate Evaluation Upstream Oil & Gas porosity well logging Domain analysis hydrogen index carbonate...
Proceedings Papers

Paper presented at the SPWLA 41st Annual Logging Symposium, June 4–7, 2000
Paper Number: SPWLA-2000-F
...-type instruments (Griffiths et al., 1999). Although the HDLL instrument has been designed mainly to be used in conjunction with computationally intensive, inversion-based interpretation procedures (Frenkel and Mezzatesta, 1998; Hakvoort et al., 1998), an immediate interpretation suitable...
Proceedings Papers

Paper presented at the SPWLA 41st Annual Logging Symposium, June 4–7, 2000
Paper Number: SPWLA-2000-W
... Upstream Oil & Gas summation application well logging variation Computation log analysis echo train porosity Symposium spectra Depth matching amplitude estimation vertical averaging interpretation spwla 41 Artificial Intelligence contribution echoe noise tl estimate SPWLA 41...
Proceedings Papers

Paper presented at the SPWLA 40th Annual Logging Symposium, May 30–June 3, 1999
Paper Number: SPWLA-1999-QQQ
... be possible to obtain a reliable porosity with such fast passes even in the very adverse conditions of oil filtrate and gas-filled pores. This paper first presents an example of NMR data used in the computation of irreducible water saturation, with comparison to core results and traditional resistivity...
Proceedings Papers

Paper presented at the SPWLA 39th Annual Logging Symposium, May 26–28, 1998
Paper Number: SPWLA-1998-WW
... computations. Induction measurements of deep resistivity can be suppressed by nearby conductive beds or even erroneously elevated in laminated sections. Examples are presented of volumetric analyses and pay/sand counts using both conventional curve data and "squared" inversion results. Oil in place...
Proceedings Papers

Paper presented at the SPWLA 38th Annual Logging Symposium, June 15–18, 1997
Paper Number: SPWLA-1997-P
... Reservoir Characterization attenuation source wavelet center freq Computation early refracted arrival strong cement Transducer separation weak cement transmitter Upstream Oil & Gas Thickness cement annulus kHz frequency spwla 38th Cement Bond Evaluation separation cement...

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