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Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009

Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009
Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009
The Kumano fore-arc basin overlies the Nankai accretionary prism, formed by the subduction of the Philippine Sea Plate beneath the Eurasian plate offshore the Kii Peninsula, SW Honshu, Japan. Seismic surveys and boreholes within the framework of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) project show evidence of gas hydrates and free gas within the basin. Here we use high-quality borehole sonic data from Integrated Oceanic Drilling Program (IODP) Site C0009 to quantify the free gas distribution in the landward part of the basin. The Brie theory is used to quantify gas content from sonic logs, which are calibrated from laboratory measurements on drill cores. First, we show that the sonic data are mainly sensitive to the fluid phase filling the intergranular pores (effective porosity), rather than to the total porosity that includes water bound to clay minerals. We then compare the effective porosity to lithodensity-derived porosity that acts as a proxy for total porosity. The combination of these two data sets also allows assessment of clay mineralogy of the sediments. Second, we compute free gas saturation and find a gas-rich interval that is restricted to a lithological unit characterized by a high abundance of wood fragments and lignite. This unit, at the base of the fore-arc basin, is a hydrocarbon source that should be taken into account in models explaining gas distribution and the formation of the bottom-simulating reflector within the Kumano fore-arc basin.
1525-2027
Q0AD06
Doan, Mai-Linh
c3133590-40bd-4b12-9282-4acd49ae9a2a
Conin, Marianne
0473b1ef-63d3-4f56-a270-9d5081f5370b
Henry, Pierre
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Wiersberg, Thomas
8e54cd7a-ce6a-4ba1-94b8-2a30e9708fee
Boutt, David
839bd3ab-caf4-4faf-b6a5-a4ed52e0a696
Buchs, David
e25ba1c3-6f0a-4c7f-8b30-687020c9276e
Saffer, Demian
6fd2b25f-3d8f-45cd-b063-2255867b94cd
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Cukur, Deniz
07caddab-6dd6-47cb-953e-bc3d074fa25e
Lin, Weiren
40c7a3c2-97b0-4f29-93a3-054040296528
Doan, Mai-Linh
c3133590-40bd-4b12-9282-4acd49ae9a2a
Conin, Marianne
0473b1ef-63d3-4f56-a270-9d5081f5370b
Henry, Pierre
7b53bcf6-3a64-451d-be16-d1de99a2b024
Wiersberg, Thomas
8e54cd7a-ce6a-4ba1-94b8-2a30e9708fee
Boutt, David
839bd3ab-caf4-4faf-b6a5-a4ed52e0a696
Buchs, David
e25ba1c3-6f0a-4c7f-8b30-687020c9276e
Saffer, Demian
6fd2b25f-3d8f-45cd-b063-2255867b94cd
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Cukur, Deniz
07caddab-6dd6-47cb-953e-bc3d074fa25e
Lin, Weiren
40c7a3c2-97b0-4f29-93a3-054040296528

Doan, Mai-Linh, Conin, Marianne, Henry, Pierre, Wiersberg, Thomas, Boutt, David, Buchs, David, Saffer, Demian, McNeill, Lisa C., Cukur, Deniz and Lin, Weiren (2011) Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009. Geochemistry, Geophysics, Geosystems, 12, Q0AD06. (doi:10.1029/2010GC003284).

Record type: Article

Abstract

The Kumano fore-arc basin overlies the Nankai accretionary prism, formed by the subduction of the Philippine Sea Plate beneath the Eurasian plate offshore the Kii Peninsula, SW Honshu, Japan. Seismic surveys and boreholes within the framework of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) project show evidence of gas hydrates and free gas within the basin. Here we use high-quality borehole sonic data from Integrated Oceanic Drilling Program (IODP) Site C0009 to quantify the free gas distribution in the landward part of the basin. The Brie theory is used to quantify gas content from sonic logs, which are calibrated from laboratory measurements on drill cores. First, we show that the sonic data are mainly sensitive to the fluid phase filling the intergranular pores (effective porosity), rather than to the total porosity that includes water bound to clay minerals. We then compare the effective porosity to lithodensity-derived porosity that acts as a proxy for total porosity. The combination of these two data sets also allows assessment of clay mineralogy of the sediments. Second, we compute free gas saturation and find a gas-rich interval that is restricted to a lithological unit characterized by a high abundance of wood fragments and lignite. This unit, at the base of the fore-arc basin, is a hydrocarbon source that should be taken into account in models explaining gas distribution and the formation of the bottom-simulating reflector within the Kumano fore-arc basin.

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More information

Published date: 28 January 2011

Identifiers

Local EPrints ID: 176541
URI: http://eprints.soton.ac.uk/id/eprint/176541
ISSN: 1525-2027
PURE UUID: fdae6a6c-bcf8-46fb-80ce-2d4e3c35b834
ORCID for Lisa C. McNeill: ORCID iD orcid.org/0000-0002-8689-5882

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Date deposited: 08 Mar 2011 11:26
Last modified: 16 Nov 2021 02:39

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Contributors

Author: Mai-Linh Doan
Author: Marianne Conin
Author: Pierre Henry
Author: Thomas Wiersberg
Author: David Boutt
Author: David Buchs
Author: Demian Saffer
Author: Lisa C. McNeill ORCID iD
Author: Deniz Cukur
Author: Weiren Lin

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