Petroleum Engineering as an Aid in Exploration Geology

C. V. Millikan

AAPG Bulletin

... formation is small. Some reservoirs may have a higher reservoir pressure than the hydrostatic head of the drilling mud.(FOOTNOTE 5) This causes...

Reply to K. Magara's Discussion of "A New Approach to Sediment Diagenesis": REPLY

J. N. Van Elsberg

CSPG Bulletin

...------- Magara states "It has been widely known that the normal compaction trend of the shale transit time - depth plot can be approximated by a straight...

Factors controlling petroleum accumulation and leakage in overpressured reservoirs

Fang Hao, Weilin Zhu, Huayao Zou, and Pingping Li

AAPG Bulletin

... of the petroleum basins in the world contains overpressure, a phenomenon that the formation pore pressure is significantly higher than the hydrostatic pressure...

Difference in overpressure environments for the western and central deep-water Gulf of Mexico

Sharon Cornelius and Peter A. Emmet

AAPG Bulletin

... in situ pressure. Overpressure is pressure in excess of local hydrostatic pressure at a given depth, which for the GOM is 0.465 psi/ft. For this study...

Feasibility of Underground Natural Gas Storage in Yellowstone Field Woods County, Oklahoma

Bijan Esfandiari

Oklahoma City Geological Society

.... A normal overburden pressure gradient of 1.0 psi/ft is assumed fracture gradients in psi/ft, and formation storage pressure psig was calculated. The results...

Abstract: Integration of Time-lapse Seismic Analysis with Reservoir Simulation; #90187 (2014)

Naimeh Riazi, Laurence Lines, and Brian Russell

Search and Discovery.com

... are critical bulk and shear modulus, respectively. Peff , Pext and Pi are effective pressure, hydrostatic pressure and initial pressure, respectively and n...

Cross-Formational Gravity-Flow of Groundwater: A Mechanism of the Transport and Accumulation of Petroleum (The Generalized Hydraulic Theory of Petroleum Migration)

Jozsef Toth

AAPG Special Volumes

... deviations for the areas of recharge and discharge, respectively, from the normal (hydrostatic) pressure increase which is found in the region...

Possible Causes of Velocity Mis-Ties

R. A. Broding

Oklahoma City Geological Society

... the formation and the bore hole hydrostatic pressure of less than 5%, which would result in errors of less than 1%. This value was arrived at from Hicks(4...

Log Evaluation and Wireline Operations In The Delaware Basin

G. F. Horst, D. A. Wilson

West Texas Geological Society

... is the presence of gas in the borehole fluids. As the equipment is lowered into the well and hydrostatic pressure and temperature increase, gas is forced...

Two-Dimensional Modeling of Groundwater Flow in an Evolving Deltaic Environment

David S. Gordon, Peter B. Flemings

Special Publications of SEPM

... in the showtt in pressure is hydrostatic this ratio is approximately 0 513 at the sediment water interface and it decreases with depth because the bulk...

Obscure Nature of Petroleum Migration and Entrapment

John C. Cartmill

AAPG Bulletin

... saturated to the prevailing hydrostatic pressure, and many of the oil fields that do have undersaturated oil are under active water drives capable...

Gas Storage Capacity of Iljik and Hasandong Shales in Gyongsang Basin, South Korea

Seungmo Kang, Young Jae Shinn, I. Yucel, Akkutlu

Unconventional Resources Technology Conference (URTEC)

... effective stress, Kang et al. (2011). Confining pressure is kept constant and change in pore compressibility is observed due to changes in pore...

Present-day stress regime, permeability, and fracture stimulations of coal reservoirs in the Qinshui Basin, northern China

Shida Chen, Yafei Zhang, Dazhen Tang, Shu Tao, Yifan Pu, and Zhenhong Chen

AAPG Bulletin

... (in megapascals). The ps refers to the minimum bottomhole pressure to keep existing fractures open, which is equal to the normal stress acting on the vertical...

ABSTRACT Coupled Fluid-Mechanical Models of Large Scale Delta Instability, #90123 (2011)

Steven Ings, Christopher Beaumont

Search and Discovery.com

... is often associated with pore fluid pressures that significantly exceed hydrostatic levels (e.g., Wu and Bally, 2000). Regions affected by shale...

The Integration of Hydrodynamics and Stratigraphy, Muddy Sandstone, Northern Powder River Basin, Wyoming and Montana

D. A. Smith

Wyoming Geological Association

..., and areas of anomalously high pressures. The Kitty field area represents an abnormally high pressure system which is surrounded by a low-permeability...

Diffusion of Fluids Through Porous Media with Implications in Petroleum Geology

G. N. Pandey , M. Rasin Tek , Donald L. Katz

AAPG Bulletin

... flux was reduced to about 22 percent of the normal rate with no pressure differential. Unsteady-state data in Table 5 show that a nitrogen pressure...

Discussion on Low-Cost Drilling Technologies of Normal Pressure Shale Gas in the Outer Margin of the Sichuan Basin

Search and Discovery.com

ABSTRACT: Seismic-Based Geomechaical Modeling Provides Attributes for Directional Well Planning; #90013 (2003)

EVGENII KOZLOV, IGOR GARAGASH, ALLEN LOWRIE

Search and Discovery.com

... (Figures 7 and 10a) is higher than in the enclosing strata, and exceeds hydrostatic pressure by several tens of percent, while in the pore pressure map...

Depths of Oil Origin and Primary Migration: A GEOLOGIST'S DISCUSSION--REPLY

Robert J. Cordell

AAPG Bulletin

... to an appreciably higher elevation. The fluid pressure in the reservoir would be intermediate between the shale-fluid pressure and hydrostatic...

Underbalanced, Horizontal Coal Seam Gas Development in Australia … A Case History

Julmar Shaun S. Toralde, Chad H. Wuest

Unconventional Resources Technology Conference (URTEC)

... with formation water as this leaked into the coal seam before sufficient hydrostatic pressure had developed to kill the well. This was also attempted...

Delineation of Anomalously Pressured Gas Accumulations in the Riverton Dome Area, Wind River Basin, Wyoming

Ronald C. Surdam, Zun Sheng Jiao, Nicholas G. K. Boyd III

Wyoming Geological Association

...-dimensional evaluation, of the pressure boundary between normal and anomalous pressure regimes (i.e., this boundary is typically expressed as a significant...

Hierarchies of overpressure retardation of organic matter maturation: Case studies from petroleum basins in China

Fang Hao, Huayao Zou, Zaisheng Gong, Shigang Yang, Zhiping Zeng

AAPG Bulletin

.../n-C18 remain constant or even increase slightly with increasing depth, which is contrary to the normal trend under hydrostatic pressure conditions...

The function of faults in hydraulic hydrocarbon entrapment: Theoretical considerations and a field study from the Trans-Tisza region, Hungary

Brigitta Czauner, Judit Madl-Szonyi

AAPG Bulletin

...-permeability fault), pressure data from both aquifers define a hydrostatic vertical gradient on a pressure elevation plot (Figure 1C). However, pressure...

Geological and Geochemical Models in Oil Exploration; Principles and Practical Examples

P. Ungerer, F. Bessis, P. Y. Chenet, B. Durand, E. Nogaret, A. Chiarelli, J.L. Oudin, J.F. Perrin

AAPG Special Volumes

... of the main results of the model applied to the Viking graben: a) oil saturation; b) excess pressure relative to hydrostatic. The first stage...

Micrologging

R. D. Ford

Tulsa Geological Society

... such logs as that shown on the right of Figure 1. The principle of operation of the MicroLog is based on the premise that differential hydrostatic...