Short note: Formation fracturing caused by excessive borehole fluid pressures during drilling in unconsolidated or coastal-plain sediments may be an unknown problem on your project

Douglas E. Wyatt, Frank H. Syms

Environmental Geosciences (DEG)

... = depth (feet); SZ = overburden at depth Z (psi); p = pore (formation) pressure (psi).In equation 1, using CPT effective overburden pressure for SZ...

Clay Minerals and Log Analysis

Eric Eslinger, David Pevear

Special Publications of SEPM

... and the manner in which these tools have been used to determine the variables in the equation above can be found in several texts; these include Asquith...

Shaly Sand Analysis as an Indicator of Hydrocarbon Production Potential in the Olmos Formation, Las Tiendas Trend, South Texas

K. T. Barrow , G. B. Asquith , G. L. Causey

GCAGS Transactions

... below the depth to which bioturbation has completely homogenized sand with overlying silt and clay. Due to the presence of chlorite and illite...

Integration of RTA Based Reservoir Surveillance and Analytical Flow Simulation to Forecast Production in the Haynesville Shale

Carlos Santacruz, Raul Esquivel, Jordan Smith, Rick F. Walker, Sebastian Bayer, Thomas Soto, Marcus Wunderle, Rohan Goudge

Unconventional Resources Technology Conference (URTEC)

... approach was derived from the Telf and depth of investigation from the linear transient equation. The results of this calculation suggest that previous...

Detailed internal architecture of a fluvial channel sandstone determined from outcrop, cores, and 3-D ground-penetrating radar: Example from the middle Cretaceous Ferron Sandstone, east-central Utah

Rucsandra M. Corbeanu, Kristian Soegaard, Robert B. Szerbiak, John B. Thurmond, George A. McMechan, Deming Wang, Steven Snelgrove, Craig B. Forster, Ari Menitove

AAPG Bulletin

... the response of primary sedimentary features and complicate the GPR signature. Data preprocessing, velocity analysis, and depth migration can focus...

Improved Permeability Estimates in Carbonate Reservoirs Using Electrofacies Characterization: A Case Study of Mumbai High South; #41069 (2012)

Pushpa Sharma, G. Mamgain, V. K. Bahuguna, and Chaman Lal

Search and Discovery.com

... with there corresponding depth for characterizing the electrofacies groups. The used well logs are: Gamma ray (GR), resistivity (LLD), neutron (NPHI), density...

In situ stress variations associated with regional changes in tectonic setting, northeastern Brooks Range and eastern North Slope of Alaska

Nilesh C. Dixit, Catherine L. Hanks, Wesley K. Wallace, Mohabbat Ahmadi, and Obadare Awoleke

AAPG Bulletin

... densities from the surface to a given depth (Engelder, 1993), as shown in equation 1.Here, is the bulk density of the overlying rocks at depth Z...

Do the Seismic Velocities Depend from Time-Temperature Index?

Tanima Dutta, Tapan Mukerji, Gary Mavko, Kenneth Peters

Search and Discovery.com

... heat-flow: QĮȜ 1 Notes by Presenter These are the well logs from a single well. We are showing the time, measured depth, vshale, and the crossover...

High Resolution Monitoring and Modeling of Steam Injection in the Athabasca Oil Sands at UTF: A Case Study

Search and Discovery.com

... mudstones of the Clearwater formation. The colorscale is cast to the Gamma-ray count (API) for each depth measurement. AAPG Search and Discovery Article...

Construction of Geological Sections of Folds with Steep-Limb Attenuation

William Daniel Gill

AAPG Bulletin

... of error in applying this equation lies in the assumption that the amount of compaction is a linear function of the force of compaction...

VSP and Well Logs from a Shallow Test Well

Search and Discovery.com

.... Comparison of the velocity logs with the gamma-ray log shows that lower velocities (2.0 to 2.2 km/sec) coincide with high gamma-ray activity...

Two Inversion Case Studies from the SCOOP and STACK Area of Oklahoma

Satinder Chopra, Ritesh Kumar Sharma, James Keay

Unconventional Resources Technology Conference (URTEC)

... approach (as described in Ray and Chopra, 2016) is used, wherein a target log is modeled as a linear combination of several input attributes at each...

Integrated Rock Characterization of a Shale Gas Field in the Horn River Basin, Canada

Tadesse Weldu Teklu, Daejin Park, Hoiseok Jung, Jennifer L. Miskimins

Unconventional Resources Technology Conference (URTEC)

... shows that two sets of linear equations (shown in Eqs. 8 and 9 and Figure 19) can be used to correlate TOC with gamma ray response. The TOC determination...

Rock-Water Reaction: Formation Damage: Part 5. Laboratory Methods

Dare Keelan, J. O. Amaefule

AAPG Special Volumes

..., with flow parallel to the linear axis. The linear velocity can be scaled to the radial flow condition existing in the wellbore. The scaled data yield...

Applications of Pre-Stack Migration; Richard Postma; Search and Discovery Article #40029 (2001)

Search and Discovery.com

Induced Seismicity Near Fox Creek, Alberta: Interpretation of Source Mechanisms

Hongliang Zhang, David W. Eaton

Unconventional Resources Technology Conference (URTEC)

...) where r denotes the source-receiver distance;  and  are density and P-wave velocity;  i is the direction cosine at the source of the ray...

Obtaining near-surface equivalent Q value from uphole survey data

Chaofeng Zhao, Wei Zhang, Jiantao Tian, Liying Ren, Qing Zhang, Jianyu Zhao

International Meeting for Applied Geoscience and Energy (IMAGE)

..., and establish the near-surface equivalent Q value equation that eliminates the inconsistency of the seismic wavelets and geophone coupling effect...

Mineral PRofile of Oil Shales in Colorado Core Hole No. 1, Picenace Creek Basin, Colorado

William A. Robb, John Ward Smith

Rocky Mountain Association of Geologists

...-ray diffraction data. The corrected peak heights of 8 minerals and the oil yield in gal/ton of the samples were plotted against depth. The mineral...

Petrophysical Data Integration Increases Reserves in Low Contrast Pay

Mark Deakin, Wan Manan

Indonesian Petroleum Association

... ∅, Log(k) and Pc-0.25. These represent reasonably linear expressions of the predictive terms with Log(Sw). The form of the predictive equation...

PETROPHYSICS OF THE MORROW FORMATION, SOUTHEASTERN NEW MEXICO

GEORGE A. HILLIS

Fort Worth Geological Society

... and reflects an average regional dip of 1.3 degrees to the southeast. The average depth to the Morrow taken from the center of the area is 13,600 feet...

Abstracts: An Investigation of Systematic Location Errors of Microseismic Events; #90173 (2015)

Martin E. Nicola, Bernd Milkereit, and Emmanuel Bongajum

Search and Discovery.com

... in Figure 1 smooth (blue log, Figure 1). Making them smooth involves computing the average values for certain depth intervals. The average P-wave velocity...

Character of Overpressure in the Deep Tuscaloosa Trend, Louisiana

Philip H. Nelson

GCAGS Transactions

... the sandstone-shale sequence of the lower Tuscaloosa Formation. Using an equation relating sonic velocity and effective stress, pore pressure computed...

Relationships Between Surface Area and Grain Size in Bottom Sediments: RESEARCH-METHOD PAPER

Sandro Rabitti, Alfredo Boldrin, Laura Menegazzo Vitturi

Journal of Sedimentary Research (SEPM)

... the simple linear regression equation: y = 1.44 + 0.59 x where y represents the estimated value of SSA in m2/g and x the measured percentage of clay...

Pluto 4D Monitor Two - A Second Outstanding Success

Sandra Mann, Scott Gagen

Australian Petroleum Production & Exploration Association (APPEA) Journal

... of depth. The inversion is based on the full elastic wave-equation, inverts for compressibility (k), shear compliance (M) (and density) in a 1.5D data...

Basic Analysis

Richard H. Merkel

AAPG Special Volumes

..., called bottom-hole temperature (BHT). It is assumed there is a linear relationship between the two as a function of depth. This geothermal gradient...