Title:

Chemical Signatures of and Precursers to Fractures Using Fluid Inclusion Stratigraphy

Authors:

Lorie M. Dilley and Michelle M. Wilber

Key Words:

fluid inclusion stratigraphy, enhanced geothermal systems, fractures

Geo Location:

Steamboat Springs, Nevada; Karaha-Telaga Bodas, Indonesia; Java; Glass Mountain (Siskiyou County), California

Conference:

Stanford Geothermal Workshop

Year:

2010

Session:

Geochemistry

Language:

English

File Size:

735KB

View File:

Abstract:

Fluid inclusion stratigraphy (FIS) uses gas analyses of fluid inclusions to determine fluid types in geothermal systems. Peaks in FIS data are assumed to be related to location of fractures. The working hypothesis is that open fracture systems can be identified by their FIS chemical signature; that there are differences based on the mineral assemblages and geology of the system; and that there are chemical precursors in the wall rock above open, large fractures. Correlating fracture locations in cores to peaks in the FIS data indicate that select chemical species are useful in distinguishing large fracture zones from small fractures. FIS data for Steamboat Springs, Karaha, and Glass Mountain wells supports our hypothesis that the fluid inclusion gas concentration of select species such as CO2, H2S, and select organic species are useful in locating fractures. High concentrations in fluid inclusions of CO2 and H2S occur 100 percent and 75 percent of the time within 10 feet of large fractures but only 18 and 13 percent of time in areas without fractures for Steamboat Springs Well 87-29. Identifying dense fracture areas as well as large open fractures from small fracture systems would assist in fracture stimulation selection for enhanced geothermal systems.


ec2-18-204-56-97.compute-1.amazonaws.com, you have accessed 0 records today.

Press the Back button in your browser, or search again.

Copyright 2010, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.


Attend the nwxt Stanford Geothermal Workshop, click here for details.

Accessed by: ec2-18-204-56-97.compute-1.amazonaws.com (18.204.56.97)
Accessed: Thursday 29th of September 2022 03:51:01 AM