The relationship between silica diagenesis and physical properties in the East/Japan Sea; ODP Legs 127/128

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doi: 10.1016/j.jseaes.2006.11.011
Author(s): Kim, Gil-Young; Yoo, Dong-Geun; Lee, Ho-Young; Lee, Young-Joo; Kim, Dae-Choul
Author Affiliation(s): Primary:
Korea Institute of Geoscience and Mineral Resources, Petroleum and Marine Resources Division, Daejeon, South Korea
Pukyong National University, South Korea
Volume Title: Journal of Asian Earth Sciences
Source: Journal of Asian Earth Sciences, 30(3-4), p.448-456. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 1367-9120
Note: In English. Based on Publisher-supplied data
Summary: Six sites were drilled on ODP Legs 127 and 128. One of the significant results of this drilling was the detection of an opal amorphous silica (opal-A) and opal cristobalite (opal-CT) transformation at all the drill sites. Laboratory measurements of electrical resistivity and physical properties (e.g., velocity, porosity, and density) were conducted on the sediments and rocks sampled from the four sites (Sites 794, 795, 796, and 797). Electrical resistivity and physical properties data show significant change at the opal-A/opal-CT and the opal-CT/Quartz boundaries, suggesting the effects of silica diagenesis. Electrical resistivity reflects the change of physical properties (esp., velocity, wet bulk density, and porosity) well throughout the sites. The transformation boundary is easily recognized in the electrical and physical properties. Electrical resistivity increases by about 50% and 950% across the opal-A/opal-CT and opal-CT/Quartz boundaries, respectively. Thus, electrical resistivity as well as physical properties may be used to identify lithology and diagenetic boundaries such as opal-A/CT, opal-CT/Quartz, and to estimate the reservoir character (e.g., permeability and pore geometry) of sediments and rocks. Abstract Copyright (2007) Elsevier, B.V.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 29 Economic Geology, Energy Sources; Cristobalite; Density; Diagenesis; Framework silicates; Japan Sea; Leg 127; Leg 128; Marine sediments; Mineral composition; North Pacific; Northwest Pacific; Ocean Drilling Program; Opal; Opal-A; Opal-CT; Pacific Ocean; Permeability; Petroleum; Petroleum exploration; Physical properties; Porosity; Reservoir rocks; Resistivity; Sedimentary petrology; Sediments; Silica; Silica minerals; Silicates; West Pacific
Coordinates: N383655 N435912 E1392451 E1343209
N370218 N401130 E1381356 E1335200
Record ID: 2009089149
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands