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Rock Physics SIG

Wednesday 15-Sep-10 5:15 PM to 6:30 PM CDT

CGG Veritas NE4027 (Northeast Meeting Rm, Floor 4)

10300 Town Park Dr.
Houston Texas 77072 USA
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Speaker Amie Lucier

Company: Shell Oil

Event Description

Effect of gas saturation on acoustic log data in the Bossier/Haynesville shale gas play

Many technical challenges must be overcome to ensure the economic development of a shale gas resource including; (1) the drilling of safe and cost effective wells, (2) accurate assessment of gas distribution and saturation, and (3) identification of the target zones to optimize the impact of hydraulic fracture stimulation and completion. In order to meet these challenges, it is necessary to characterize the physical and mechanical properties of the shales. Sonic logs provide important data for this characterization. One motivation for this work was to determine if sonic logs in gas shales could be used to characterize rock properties that may be used in reservoir characterization, derivation of mechanical properties and estimation of in-situ stresses.

Sonic logs measured in Haynesville wells show a distinct response when compared to established mudrock Vp-Vs relationships. Measured Vp appears to be slow relative to Vs, similar to the hydrocarbon response observed in conventional reservoirs. In this work, we evaluate the mechanisms that impact the acoustic data and make meaningful corrections to it. This is accomplished by:

Assessing and eliminating formation pressure, gas-filled microcracks, lithology variations, and TOC as primary causes for the anomalous velocity behavior

Showing that Gassmann fluid substitution on a brine-saturated Haynesville-like mudrock model yields acoustic responses for partially gas-saturated rocks that are consistent with the velocity response observed in the sonic logs

Demonstrating that gas-corrected in-situ velocity data are consistent with established mudrock Vp-Vs trends

A major impact of this work is the ability to estimate gas-corrected velocities and densities that can be used to estimate elastic moduli used in a number of applications including estimation of stress profiles, hydraulic fracture simulation, and reservoir modeling.

Comments

CGG Veritas- in NE4027 (Northeast Meeting Room, Flr 4) 10300 Town Park Dr, Houston TX 77072
Visitors to the CGG Veritas building may find it easiest to park near the Northeast Building entrance. A security officer or volunteer will be stationed to let everyone into the building since this is a secure entrance. Please take the elevator to the 4th floor and signs will direct from there.

Advanced registration not required.

Attachments


Event Contact	Event Coordinator
Ayako Kameda	Ayako Kameda
(281) 544-4354	(281) 544-4354

Comments for Rock Physics SIG:

Rock Physics SIG

Wednesday 15-Sep-10 5:15 PM to 6:30 PM CDT

Speaker Amie Lucier

Company: Shell Oil

Biography

Amie Lucier has been working in the Rock Characterization and Modeling team in Exploration Technologies at Shell since January 2008. The team offers a unique multi-disciplinary environment for tackling a wide range of problems related to rock properties characterization and the evolution of rock properties through geologic and production timescales. Her research has focused on geomechanics in shale gas plays, characterizing mudrock properties adjacent to depleted reservoirs, the thermal effects of mud temperature on near wellbore stresses, and applications of geomechanics in Exploration Workflows. Prior to joining Shell, she received a B.S. in Geology from Washington and Lee University in Lexington, VA, and an M.S. and Ph.D. in Geophysics at Stanford University in Palo Alto, CA. At Stanford, she worked on geomechanics related research with Prof. Mark Zoback in the Stress and Crustal Mechanics group.