Mechanical Versus Thermal Cause of Abnormally High Pore Pressures in Shales: REPLY

Richard E. Chapman

AAPG Bulletin

... been noted that the pressure-depth gradient in the transition zone from normal to abnormal pressures exceeds the overburden gradient...

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

Gang Han, Marte Gutierrez, Peter Schmitz

Unconventional Resources Technology Conference (URTEC)

... pressure gradient provides a constant pressure difference across the two faces of the sample while oil is circulated. Permeability is determined from...

State of stress in the Illinois Basin and constraints on inducing failure

R. W. Lahann, J. A. Rupp, C. R. Medina, G. Carlson, and K. M. Johnson

Environmental Geosciences (DEG)

... model was generated for the central part of the basin, and a single pressure gradient model was constructed for the surrounding region. In the central...

ABSTRACT: The Effect of Deformation on Carbonization in High-Volatile Bituminous and Anthracitic Coals: Comparison Between Hydrostatic and Nonhydrostatic Experiments

M. Mastalerz, K.R. Wilks, R.M. Bustin, J.V. Ross

The Society for Organic Petrology (TSOP)

...-oil mixture as the pressure medium. Thennal gradients across the length of sample capsules were 1 - 2°C. At 40QoC and hydrostatic pressures from 200...

Hydrogeologic Characteristics of the Oil-Gas-Bearing Triassic Sediments of South Mangyshlak

R. G. Semashev

Petroleum Geology: A Digest of Russian Literature

... to the hydrostatic pressure but somewhat exceeding it occurs in the area of the Zhetybay-Uzen and Kobumbay steps, the Peschanomyssko-Rakushech zone...

Generic Predominance Facies Among Deep-Water Benthic Foraminifera of Gulf of Mexico: ABSTRACT

C. Wylie Poag

AAPG Bulletin

... on the continental slope and appear to be associated with water mass patterns or hydrostatic pressure changes. The Glomospira facies, which is patchily distributed...

Macroscopic Strength Profiles Determined from Hydrothermal Deformation Experiments on Granular Quartz Sand, by S.L. Karner, A.K. Kronenberg, F.M. Chester, J.S. Chester, A. Hajash; #90027 (2004)

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

William J. Plumley

AAPG Bulletin

... gradient (i.e., one that is only slightly above a condition of hydrostatic equilibrium). Consequently, the pore fluids support a greater percentage...

Overpressured Reservoirs: A New Generation of Exploration Opportunities

Richard E. Swarbrick

Indonesian Petroleum Association

..., offshore Malaysia. AAPG Bulletin, v. 78, p. 1171. Overpressure, excess pore pressure above the hydrostatic pressure gradient, is found in a wide range...

An Analysis of the Roles of Stress, Temperature, and pH in Chemical Compaction of Sandstones

Heather A. Sheldon, John Wheeler, Richard H. Worden, Michael J. Cheadle

Journal of Sedimentary Research (SEPM)

... hydrostatic palaeopressure conditions: Clay Minerals, v. 29, p. 463-473. TADA, R., AND SIEVER, R., 1986, Experimental knife-edge pressure solution...

Wireline Formation Testers: Part 4. Wireline Methods

James J. Smolen

AAPG Special Volumes

.... The sampling system shown in Figure 2 illustrates how this measurement is made. Prior to activating the tool, the pressure gauge measures hydrostatic mud...

Gas Hydrates in the North Makassar Basin, Indonesia, by B.A. Jackson; #90035 (2004)

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Experimental and Empirical Observations Supporting a Capillary Model Involving Gas Generation, Migration, and Seal Leakage for the Origin and Occurrence of Regional Gasifers

Stephen W. Burnie Sr., Brij Maini, Bruce R. Palmer, Kaush Rakhit

AAPG Special Volumes

... is a pressure-versus-elevation plot that shows the hydrostatic pressure distribution within the apparatus.FIGURE 8. Diagram of a normally pressured capillary...

2.0 Abnormal Pore Fluid Pressures: Definition, Terminology, Observations

P. E. Gretener

AAPG Special Volumes

... pressures in section 1.5 (1.5/3). Fluid pressures leading to an overall pressure gradient in the range of 0.43 to 0.48 psi/ft (0.0097 to 0.0109 MPa/m) have...

Thin-skinned Gravity Sliding as a Mechanism for Growth Faulting: Unit 10: Principles

Martin P. A. Jackson, William E. Galloway

AAPG Special Volumes

... gradient, zz. In the case o a "sealed" overpressured zone, the fluid pressure increases abruptly downward across the sealing strata (fig. 2). On a stable...

Forced Fluid flow and Diagenesis in Porous Reservoirs Controls on the Spatial Distribution

J. R. Wood, T. A. Hewett

Special Publications of SEPM

... field induces a lateral change in the fluid density which cannot be balanced by the normal hydrostatic gradient. Convective fluid flow can also occur...

New insights into the volume and pressure changes during the thermal cracking of oil to gas in reservoirs: Implications for the in-situ accumulation of gas cracked from oils

Hui Tian, Xianming Xiao, Ronald W. T. Wilkins, Yongchun Tang

AAPG Bulletin

... in a moderately overpressured system, such as the 1.5 times hydrostatic pressure gradient in Figure 7. Because overpressure can retard the increase of gas volume...

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...

Evidence for overpressure generation by kerogen-to-gas maturation in the northern Malay Basin

Mark R. P. Tingay, Chris K. Morley, Andrew Laird, Orapan Limpornpipat, Kanjana Krisadasima, Suwit Pabchanda, Hamish R. Macintyre

AAPG Bulletin

... overpressures in formations 2C, 2B, and 2A, and then display pore pressures that return to hydrostatic in the uppermost parts of FM1. Maximum pressure gradient...

Pore pressure patterns in Tertiary successions and hydrodynamic implications, Beaufort-Mackenzie Basin, Canada

Zhuoheng Chen, Kirk G. Osadetz, Dale R. Issler, Stephen E. Grasby

CSPG Bulletin

... of profiles were observed: 1) a normal pressure profile showing a constant hydrostatic pressure gradient over the entire depth interval (Fig. 4a); 2) a deep...

Use of relational databases to evaluate regional petroleum accumulation, groundwater flow, and CO2 sequestration in Kansas

Timothy R. Carr, Daniel F. Merriam, Jeremy D. Bartley

AAPG Bulletin

... indicates that the maximum recorded formation pressure follows a hydrostatic gradient for fresh groundwater or low-salinity brine (Figure 6A...

Effect of Cross-Basinal Hydrodynamic Flow on Oil Accumulations and Oil Migration History of the Bakken-Madison Petroleum System; Williston Basin, North America

William D. DeMis

Williston Basin Symposium

... tilted oil-water contacts which closely match in magnitude and direction the tilts predicted from the regional hydraulic gradient...

Pressure Seals--Interactions with Organic Matter, Experimental Observations, and Relation to a "Hydrocarbon Plugging" Hypothesis for Pressure Seal Formation

Jean K. Whelan, Lorraine Buxton, and Lawrence M. Cathles III

AAPG Special Volumes

...Pressure Seals--Interactions with Organic Matter, Experimental Observations, and Relation to a "Hydrocarbon Plugging" Hypothesis for Pressure Seal...

Rock Physics Template and its Significance in Velocity Model Building and Pore Pressure Prediction

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Abstract: Excess Pressure Development by Cementation in the Wolfcamp Formation of the Delaware Basin;

Alton Brown

Search and Discovery.com

..., Online/Virtual Abstract The Wolfcamp Fm. in the eastern Delaware basin has high excess pressure (pressure in excess of hydrostatic pressure...