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Bulletin Article

7963
 
Organic-carbon–rich shales of the lower Marcellus Formation were deposited at the toe and basinward of a prograding clinothem associated with a Mahantango Formation delta complex centered near Harrisburg, Pennsylvania. Distribution of these organic-carbon–rich shales was influenced by shifts in the delta complex driven by changes in rates of accommodation creation and by a topographically high carbonate bank that formed along the Findlay-Algonquin arch during deposition of the Onondaga Formation. Specifically, we interpret the Union Springs member (Shamokin Member of the Marcellus Formation) and the Onondaga Formation as comprising a single third-order depositional sequence. The Onondaga Formation was deposited in the lowstand to transgressive systems tract, and the Union Springs member was deposited in the transgressive, highstand, and falling-stage systems tract. The regional extent of parasequences, systems tracts, and the interpreted depositional sequence suggest that base-level fluctuations were primarily caused by allogenic forcing—eustasy, climate, or regional thermal uplift or subsidence—instead of basement fault reactivation as argued by previous workers. Paleowater depths in the region of Marcellus Formation black mudrock accumulation were at least 330 ft (100 m) as estimated by differences in strata thickness between the northwestern carbonate bank and basinal facies to the southeast. Geochemical analysis indicates anoxic to euxinic bottom-water conditions. These conditions were supported by a deep, stratified basin with a lack of circulation.
5774
 

Sandstone pressures follow the hydrostatic gradient in Miocene strata of the Mad Dog field, deep-water Gulf of Mexico, whereas pore pressures in the adjacent mudstones track a trend from well to well that can be approximated by the total vertical stress gradient. The sandstone pressures within these strata are everywhere less than the bounding mudstone pore pressures, and the difference between them is proportional to the total vertical stress. The mudstone pressure is predicted from its porosity with an exponential porosity-versus-vertical effective stress relationship, where porosity is interpreted from wireline velocity. Sonic velocities in mudstones bounding the regional sandstones fall within a narrow range throughout the field from which we interpret their vertical effective stresses can be approximated as constant. We show how to predict sandstone and mudstone pore pressure in any offset well at Mad Dog given knowledge of the local total vertical stress. At Mad Dog, the approach is complicated by the extraordinary lateral changes in total vertical stress that are caused by changing bathymetry and the presence or absence of salt. A similar approach can be used in other subsalt fields. We suggest that pore pressures within mudstones can be systematically different from those of the nearby sandstones, and that this difference can be predicted. Well programs must ensure that the borehole pressure is not too low, which results in borehole closure in the mudstone intervals, and not too high, which can result in lost circulation to the reservoir intervals.

DL Abstract

3104
 

Production from the Marcellus gas shale generated international interest when methane accumulated in the surface housing of a water well pump and exploded.

3082
 

Using examples from shale reservoirs worldwide, I demonstrate the diversity of shale-hosted fracture systems and present evidence for how and why various fractures systems form. Core and outcrop observations, strength tests on shale and on fractures in core, and geomechanical models allow prediction of fracture patterns and attributes that can be taken into account in well placement and hydraulic fracture treatment design. Both open and sealed fractures can interact with and modify hydraulic fracture size and shape. Open fractures can enhance reservoir permeability but may conduct treatment fluids great distances, in some instances possibly aseismically.

3075
 

In 2010 Senator Bingaman of New Mexico requested that Department of Energy Secretary Steven Chu engage the National Research Council (NRC), the operating arm of the National Academy of Sciences and National Academy of Engineering, to form an ad hoc committee to examine the topic of “Induced Seismicity Potential in Energy Technologies.”

Explorer Article

8045
 

Oklahoma! As-yet unlocked SCOOP and STACK plays have plen’y of room for maturation and development.

Explorer Emphasis

8058
 

Induced seismicity has been the bane of hydraulic fracturing’s public image, but research is underway to determine the precise culprit for seemingly unnatural earthquakes.

Explorer Policy Watch

3803
 

Oil and natural gas production continued to grow in the United States in 2013 even as progress on new federal laws and regulations stalled – but local opposition to shale gas and oil development increased.

Wiki Article

9048
 

From AAPG Wiki: Offshore rigs are similar to land rigs but with several additional features to adapt them to the marine environment. Those features include: Heliport, Living quarters, Cranes and Riser.

9046
 

From AAPG Wiki

Forum

Oklahoma City Oklahoma United States 29 May, 2014 29 May, 2014 3810
 
Oklahoma City, Oklahoma, United States
29 May 2014
Join us for an intensive one-day forum which will focus on optimizing the exploration and development of the Woodford Shale. We're looking at recent findings in geochemistry and geomechanics to understand how best to drill and complete the reservoir, and also where the productive limits may be.

Short Course

Houston Texas United States 19 August, 2014 21 August, 2014 1509
 
Houston, Texas, United States
19-21 August 2014

Here is an introduction to the tools and techniques that geologists and geophysicists use to locate gas and oil, that drillers use to drill the wells and that petroleum engineers use to test and complete the wells and produce the gas and oil. Exercises throughout the course provide practical experience in well log correlation, contouring, interpretation of surface and subsurface, contoured maps, seismic interpretation, well log interpretation, and decline curve analysis.

Workshop

Muscat Oman 28 April, 2014 30 April, 2014 8522
 
Muscat, Oman
28-30 April 2014

This workshop will focus on the technologies and techniques through a comprehensive technical program with presentations and discussions to share experiences, case studies, and opportunities.

Ho Chi Minh Viet Nam 25 May, 2014 28 May, 2014 7913
 
Ho Chi Minh, Viet Nam
25-28 May 2014

The purpose of this workshop is to bring together all stakeholders necessary to consider the potential bottle-necks and pinch point related to optimising a field’s production given a full understanding of the necessary components from the reservoir to the well-head.

Pittsburgh Pennsylvania United States 17 June, 2014 19 June, 2014 3780
 
Pittsburgh, Pennsylvania, United States
17-19 June 2014

Two of the top unconventional plays just keep getting stronger. Learn why they are successful, and how to optimize exploration and development.

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