Subsurface Pressure and Temperature Distributions: In Sacramento Basin, California

M. S. Lico, Y. K. Kharaka

Pacific Section of AAPG

... are hydrostatic to the top of the geopressured zone (pressure gradient >9.8 kPa/m). When the geopressured zone is encountered, pressure gradients become much higher...

Can Dispersive Pressure Cause Inverse Grading in Grain Flows?

Francois Legros

Journal of Sedimentary Research (SEPM)

... level in a shearing mass of grains is always equal to the applied normal stress. An increase in dispersive pressure causes an immediate expansion...

Baseline/Calibration Method for Reservoir Pressure Determination

J.R. Adams, B. Dotson, H. Sebastian, S. Motealleh

Unconventional Resources Technology Conference (URTEC)

... to be under-pressured in which case the static bottomhole pressure is less than the hydrostatic pressure in the wellbore, producing a vacuum condition...

Water Production from Abnormally Pressured Gas Reservoirs in South Louisiana

W. E. Wallace

GCAGS Transactions

... was abandoned, the shut-in bottom hole pressure was 3250 psi (normal hydrostatic pressure would have been 5860 psi, maximum). Geological Conditions...

Manage Risk with Breakthrough Seismic Acquisition Technology: The GeoStreamer Story Continues New Reservoir Opportunities Revealed

Cyrille Reiser, Folke Engelmark

Petroleum Exploration Society of Australia (PESA)

... than 10,000 km 2 of 3D in a variety of the seismic velocity variations in the depth under hydrostatic pore pressure follows of geological settings...

Abnormally High Fluid Pressure: Survey of Some Basic Principles: GEOLOGIC NOTES

William J. Plumley

AAPG Bulletin

..., provided a rigorous approach for analysis of the possible magnitude of such effects. MODELS OF NORMAL FLUID PRESSURE We can specify some subsurface rock...

Deep Pore Fluid Pressure Prediction in Challenging Areas, Malay Basin, SE Asia

Stephen O’Connor, Richard Swarbrick, Jamaal Hoesni, Richard Lahann

Indonesian Petroleum Association

... to the current Lange pore pressure profile in Well 6406/2-3 are illustrated in Figure 7 (GPT/IHS, 2007). The blue line on the left is the hydrostatic (normal...

The Occurrence, Causes and Detection of Abnormal Pressure in the Malay Basin

Indarjit Singh, C. H. Ford

Southeast Asia Petroleum Exploration Society (SEAPEX)

... of subsurface formations whereby the pressure exerted by the fluids within a rock unit at a particular depth exceeds the hydrostatic pressure exerted...

Stress-Dependent Flow, Mechanical, and Acoustic Properties for an Unconventional Oil Reservoir Rock

Gang Han, Marte Gutierrez, Peter Schmitz

Unconventional Resources Technology Conference (URTEC)

... preparation and laboratory setup, most measurements of unconventional rock are still limited to hydrostatic stress conditions. This paper investigates a nano...

Subsurface Geotechnical Hazards in Petroleum and Geothermal Development

Robert C. Erickson

AAPG Special Volumes

... exceed a normal or hydrostatic pressure expected for a given depth below the surface. Geopressured sequences of rock can be recognized by several...

Natural-Membrane Phenomena and Subsurface Waste Emplacement

Bruce B. Hanshaw

AAPG Special Volumes

... solutions are confined. Osmotic pressure is the hydrostatic pressure difference across a membrane which results from a greater net transfer of water...

Deformation Mechanism of Unconsolidated Quartz Sands as a Function of Grain Size Distribution: Insights Into Deformation Band Formation in Mixed Aeolian-Fluvial Reservoirs; #51606 (2019)

Karl Clark, Ian G. Stimpson, John Bedford, Dan Faulkner

Search and Discovery.com

... as mixing to attain any grain size distribution we require. Hydrostatic deformation tests were performed to establish the critical effective pressure (P...

Marine Seismic Sources: Part VI: High Frequency Signals From Air-Guns

Martin Landrø, Lasse Amundsen

GEO ExPro Magazine

... is approximately –1.3 bars, assuming linear theory. The hydrostatic pressure at the hydrophone position is 1.2 bars, which means that the total pressure...

Geothermal and Geopressure Assessment with Implications for Carbon Dioxide Sequestration, Lower Tuscaloosa Formation, Louisiana

Timmon Drumm, Jeffrey A. Nunn

GCAGS Transactions

... are separated into three groups: blue diamonds, near hydrostatic pressure gradients of 10 to less than 12.5 kPa/m (0.44–0.55 psi/ft); green triangles...

Hydrocarbon Production, Surface Subsidence, and Land Loss in Louisiana

Byron Miller

GCAGS Transactions

... Bottom Hole Pressure (BHP) data vs depth for producing wells in the fields studied, illustrating normal-hydrostatic, pressure-depleted, and geopressured...

Gas saturation and CO2 enhancement potential of coalbed methane reservoirs as a function of depth

Yves Gensterblum, Alexej Merkel, Andreas Busch, Bernhard M. Krooss, Ralf Littke

AAPG Bulletin

... the corresponding Langmuir parameters in combination with a geothermal gradient of 0.03 K/m and a normal hydrostatic pressure gradient. Taking the gas...

Characteristics of Natural Hydrocarbon Systems of Fields of the Southwest Regions of the Yakutsk ASSR

V. Ye. Bakin, Yu. I. Yakovlev

Petroleum Geology: A Digest of Russian Literature

.... Formation pressure in individual horizons is 4.0-7.0 mpa below the hydrostatic pressure, and formation temperature at a depth of 1500 m is 6-10°C...

Abstract: Integrating Geology and Velocity Data to Constrain Pressure Prediction in Foldbelts; #90063 (2007)

Search and Discovery.com

Some Uncertainties in Predicting Overpressure in Indonesia’s Sedimentary Basins

Search and Discovery.com

Outlining Shale Masses By Geophysical Methods

A. W. Musgrave , W. G. Hicks

AAPG Special Volumes

... overburden pressure increases at the rate of 1 psi per foot of depth. This is the normal increase with depth of burial. The normal hydrostatic...

Chapter 3: Overpressure in Shale Gas: When Geochemistry and Reservoir Engineering Data Meet and Agree

Jean-Yves Chatellier, Pawel Flek, Marianne Molgat, Irene Anderson, Kevin Ferworn, Nabila Lazreg Larsen, Steve Ko

AAPG Special Volumes

.... Two reference gradients were used as references in the pressure-depth plots: the hydrostatic pressure gradient of 10 kPa/m and a normal fracture...

Workflow for Pore Pressure and Horizontal Stress Field Estimation in Vertical Wells Using Well Data in the XŽ Field in South Sumatra

Mohammad Zulfikar Simatupang, Bonar Tua Halomoan Marbun, Ramadhana Aristya, Niko Pratama Purba

Indonesian Petroleum Association

... of porosity log, such as resistivity and sonic. The correct determination of the mudrock normal compaction trend is crucial for pore pressure...

Interpretation of Piezocone Penetrometer Profiles in Sediment from the Mackenzie Trough, Canadian Beaufort Sea

Kathryn Moran, Philip R. Hill, Steve M. Blasco

Journal of Sedimentary Research (SEPM)

... be equal to hydrostatic (no excess pore pressure) or greater than hydrostatic (positive excess pore pressure). Settings which may give rise to positive...

Compaction and Cementation of Sand Under Conditions Simulating Deep Burial

John C. Maxwell

Tulsa Geological Society

...) composition of sediments, (2) composition of interstitial fluids, (3) temperature, (4) time, (5) weight of overburden, and (6) hydrostatic pressure...

Quantitative Assessment of Regional Siliciclastic Top-Seal Potential: a new application of proven technology in frontier and maturing South American basins

J. A. Deckelman, S. Lou, P. S. D’onfro, R. W. Lahann

Asociación Colombiana de Geólogos y Geofisicos del Petróleo (ACGGP)

... and hydrostatic pressure gradients, by estimating effective stress, and then subtracting effective stress from lithostatic pressure (Fig. 5). Lithostatic...