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| Core-Log-Seismic Integration |
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Workshop |
2005 Oct 3 - 4
International
Workshop on Core-Log-Seismic Integration: New Scientific and Technological Challenges |
| The new phase of the Ocean Drilling Program, the world's longest running,
largest and most successful international marine-earth science program, provides an excellent opportunity
to review core - log - seismic integration experience and practice from previous academic and industry
case studies in continental and ocean drilling and coring. This latest transition provides a potential
opportunity to define homogeneous standards, procedures, and practices in the Integrated Ocean Drilling
Program (IODP) and the International Continental Drilling Program (ICDP). The goal of this symposium
is to promote discussions between scientists who use core, log and seismic data to address academic or
industrial problems and scientists who are developing new database, data handling, and visualization
technologies. Another aim is to review and explore extant methods for processing and analysis of core,
log and seismic data. Emphasis is placed upon problem solving using a variety of methodologies and approaches
to core - log - seismic integration. In both cases an endeavor to establish the interdependence between
the problem addressed and the technology/methodology used will be emphasized. |
The topics to be discussed will include:
(1) the different approaches to core - log and core - log - seismic integration from theoretical (scaling
problem, modeling, petrophysics) or technological (engineering, IT) points of view,
(2) the possibilities for testing these methods using individual case-studies (including oceanic/continental
environments),
(3) the conclusions drawn from the underlying physics and mathematics -or the lack of them !-, and most
importantly,
(4) an intercomparison and, hopefully, even an interchange of methods and views between researchers working
in the related fields.
The different aspects of core - log - seismic integration, often comprise the core
of current discussions and conferences in both academic and industrial applications, are intended to
be included within contributions from each individual field instead of providing the motivation for a
specific session. The argument driving this decision is the much more vivid interchange of knowledge
on practice and methods among these fields. |
Dr. Brewer, Tim, Borehole Research Group, Univ. of Leicester
Dr. Harms, Ulrich, International Continental Scientific Drilling Program
Dr. Higgins, Sean; Borehole Research Group, LDEO, Univ. of Columbia
Dr. Nakamura, Yasuyuki, Ocean Research Inst., Univ. of Tokyo (rep. J-DESC)
Dr. Sakamoto, Tatsuhiko, IFREE, JAMSTEC (rep. IODP STP)
Dr. Tezuka, Kazuhiko, JAPEX (rep. SPWLA)
Dr. Hisao Ito, CDEX, JAMSTEC
Organized by Center for Deep Earth Exploration (CDEX)
Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
and Japan Drilling Earth-Science Consortium (J-DESC)
JAMSTEC Tokyo Office
Hibiya Central Bld. 10F, 1-2-9 Shinbashi, Minato-ku, Tokyo, Japan
October 3-4, 2005 |
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Extra information / Extra materials |
Last remark / addition
(Ralp Stephen, Woods Hole Oceanographic Institution, US)
Since our best images of the interior of the earth are based on seismic methods, one important goal
of many deep boreholes is to provide ground truth and to calibrate seismic record sections. Borehole
seismology is one of the few tools we have to link the borehole scale (defined by cores and well logging)
to the regional scale (defined by multi-channel and refraction seismics). Also given the significant
lateral heterogeneity observed along strike in all subduction zone environments, extrapolating the borehole
results along the subduction zone will require a thorough knowledge of how the reflected seismic wave
field is created and how it relates to the borehole observations. Normal incidence VSP's have proved
very useful in the past in correlating core and well log observations with regional multi-channel and
single-channel seismic records
In-situ (temperature and pressure controlled) measurements of P- and S-wave velocity
(Contribution of Prof H. Kern, Institut f. Geowissenschaften, Univeristy of Kiel, Germany)
The measurements of compressional (Vp) and shear wave velocities (Vs) at pressure and temperature
are performed on cube-shaped specimens (43mm edge length) using the ultrasonic transmission technique
with transducers (lead zirconium titanate) operating at 2 MHz and 1 MHz, respectively. Measurements can
be done at pressures up to 600 MPa and temperatures up to 750°C. The special arrangement of the apparatus
allows simultaneous measurements of compressional and orthogonal polarized shear wave velocities (S1,S2)
in three perpendicular directions. Length and resulting volume changes of the sample cubes, due to changes
of principal stress and temperature, are obtained by the piston displacements. Each set of results of
one experiment is thus composed of nine velocity values: three P-wave velocities and six S-wave velocities
and, in addition, of the length changes of the sample cube in the three orthogonal directions. The cumulative
error in Vp and Vs is estimated to be >1%. Densities are calculated from mass of the cubes and their
actual dimensions at pressure and temperature.
Figure: Multi-anvil pressure apparatus for the temperature- and pressure controlled measurements of
P- and S-wave velocities (Courtesy of Prof H.Kern)
Measurements on uncosolidated sediments
(Contribution of Dr. Shinichi Sakurai, now at Occidental Oil and Gas Corporation)
As I recommended during last October meeting, proper core plug preparation is critical to make measurements
on soft samples, which can be used to tie between core analysis results and either geophysics and petrophysics.
Core analysis results under un-confined state will not be so useful to compared with wireline logs and
seismic data. Therefore, some special equipments will be also required. I used to work for Core Labs
before and have been working with them many years, as they provides best quality services on coring,
core preparation and measurements. +
Core Labs home page:
http://www.corelab.com/index.asp
http://www.corelab.com/PetroleumServices/Routine/unconsolidated.asp
Data standards from Oil companies
(Compilation from Jun Fukutomi, CDEX, JAMSTEC)
1) POS
Petrotechnical Open Standards Consortium, Inc (POSC)
POSC is an international not-for-profit membership corporation. It provides open specifications for information
modeling, information management, and data and application integration over the life cycle of E&P
assets. Almost all oil exploration companies use POSC standards for their welsite data format.
For more
information, visit http://www.posc.org/
POSC manages log data standsrds such as DLIS, LIS, etc. as well (See energy eStandsrds page), but seismic-related
is out of POSC.
2) The Society of Exploration Geophysicists (http://seg.org/)
http://www.seg.org/publications/tech-stand/
3) Free software from Schlumberger.
http://www.slb.com/content/services/evaluation/software/data_utilities.asp?
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