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The AAPG/Datapages Combined Publications Database

Showing 1,480 Results. Searched 187,797 documents.

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Abstract: On Choosing Differential Operators; #90171 (2013)

John C. Bancroft

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... with the main emphasis placed on the first derivative, using a polynomial and spectrally derived approximations. The accuracy of the operators is compared using...


Abstract: On Choosing Differential Operators; #90171 (2013)

John C. Bancroft

Search and

... with the main emphasis placed on the first derivative, using a polynomial and spectrally derived approximations. The accuracy of the operators is compared using...


Finite Difference Modeling: Part I: Become Expert in Five Minutes

Lasse Amundsen, Ørjan Pedersen, Martin Landrø

GEO ExPro Magazine

... a little bit… derivative.” The history of calculus does not begin with the findings of the English mathematician and physicist Sir Isaac Newton (1642...


Numerical Modeling of 1D Anomalous Diffusion in Unconventional Wells Using a Nonuniform Mesh

Ralf Holy, Erdal Ozkan

Unconventional Resources Technology Conference (URTEC)

... coefficient similar to Darcy’s permeability with field units of md. d1−α . ft β−1 . The time-fractional derivative ∂1−α 𝑓𝑓(𝑡𝑡)⁄∂t1−α is defined...


Characteristics of the Free Surface Multiple Attenuation Using Wave Field Extrapolation; #40504 (2010)

Patrícia P. Ferreira, Marco Antonio, Cetale Santos, and Luiz Landau

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... attenuation is based on forward wave field extrapolation theoretical principles in which the one-way Rayleigh integral uses the input data as a prediction...


Recognition of Subtle Features in Geologic Maps

J. E. Robinson, D. F. Merriam

CSPG Special Publications

... of noise. Operators such as downward continuation, derivative, and edge detection can be applied to digital geologic maps on shallow, well-documented...


Unsteady-state diffusion modeling of gas in coal matrix for horizontal well production

Jian-Chun Guo, Ren-Shi Nie, and Yong-Lu Jia

AAPG Bulletin

...-integral function () and its derivative () with dimensionless production time (); and are plotted using full lines and dashed lines, respectively. Rate...


Characterization of Gas Reservoirs Using Production Data Analysis - Pre-Tertiary Basement Gas Reservoir, South Sumatra, Indonesia

Helmi Pratikno, Teddy H. Komaroedin, Taufan Marhaendrajana

Indonesian Petroleum Association

... integral-derivative functions to present data function with better resolution, as well as to account for variable-rate/variable pressure drop...


Abstract: A Phase Shift Plus Interpolation Extrapolation for Two-way Wave Equation Migration; #90172 (2014)

Jianhua Pan

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... applied to downgoing wave and upgoing wave are different and the derivative of wavefield to depth needs to be calculated. A synthetic example presented...


Multispectral Volumetric Curvature Adding Value to3D Seismic Data Interpretation, #41540 (2015).

Satinder Chopra, Kurt J. Marfurt

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... filter of the form kx (α-1) applied to a conventional first derivative. The space domain operators corresponding to different values of α mentioned...


An Alternative BEM Modeling of Transient Pressure Response of Fractured Reservoir by Use of a Semi-Analytical Approach

Junlei Wang, Ailin Jia, Yunsheng Wei, Yadong Qi

Unconventional Resources Technology Conference (URTEC)

... the segment. Besides, both flow across the edge of fracture and fluid compressibility is negligible. Using the Fredholm integral equation (Cinco-Ley, 1978...


Niobrara Oil Potential

Richard A. Harnett

Earth Science Bulletin (WGA)

... within an area to a first derivative map. The first derivative equals the slope, or dip. Then a second derivative map is constructed which shows...


Size Frequency Distributions of Sediments

W. C. Krumbein

Journal of Sedimentary Research (SEPM)

... with it an integral curve and a derivative curve. The integral curve is such that its ordinate at any point represents the area under the given curve up...


Optimizing the Development of a Stacked Continuous Resource Play in the Midland Basin

James Courtier, Joe Wicker, Travis Jeffers, Pat Curth

Unconventional Resources Technology Conference (URTEC)

..., allows for the development of a very high quality series of acoustic impedance inversion products and associated derivative attributes. Laredo has...


A Collaborative Study on DFIT Interpretation: Integrating Modeling, Field Data, and Analytical Techniques

Mark McClure, Vidya Bammidi, Craig Cipolla, Dave Cramer, Lucas Martin, Alexei Savitski, Dave Sobernheim, Kate Voller

Unconventional Resources Technology Conference (URTEC)

... the written consent of URTeC is prohibited. Abstract This paper summarizes findings from a one-year study sponsored by seven operators and service companies...


Gas in Place and Reservoir Characterization Estimation Using Dynamic Production Data, a Comparative Study

Tri Firmanto, Aditya Zulfa, Jufenilamora Nurak

Indonesian Petroleum Association

... of the production data and rate integral derivative as shown by equation 3 and 4 below. ………………………(3) ...…(4) These curves are less recommended that the Type...


The 3-D Seismic Exploration Wheel and Treatments for Economic Pain along the Learning Curve

Marlin, Donald J.

GCAGS Transactions

... in any 3-D exploration program. This pain is due to a reduction in reserve expectation accompanied by several magnitudes of derivative issues...


Production Data Analysis in Complex Fracture Network Horizontal Wells with SRV Effects

Zhiming Chen, Xuefeng Tang, Xinwei Liao, Junlei Wang, Xingjiao Zhang, Jiaqi Wu, Haitao Zhang

Unconventional Resources Technology Conference (URTEC)

... and inner radius, while it decreases with the increases in mobility ratio and capacity ratio. Like pressure difference and its derivative, the flow...


Resolution of Carbonate Reservoirs at Depth--An Integrated Approach to Lower Development Risk, Smackover Trend, Alabama: Reservoir Properties Prediction

Timothy J. Petta, J. Gregory Bryant

AAPG Special Volumes

... spacing was collected during 1988. Second derivative maps of a filtered residual data set clearly indicate lateral density contrasts that are apparently...


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