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Report No.
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Application of log interpretation methods to evaluate heterogeneity in diatomaceous mudstone at Horonobe area

Hara, Akio; Tsuji, Takashi*; Nishimura, Mizue*; Hoshi, Kazuyoshi*; Yagi, Masahiko*; Kawada, Koji*; Hou, J.-Y.*

Borehole log interpretation methods, which are usually used by petroleum exploration companies, are applied for evaluating heterogeneity of deep underground diatomaceous mudstones in the Horonobe area. Natural $$gamma$$ ray log and electrical micro image (EMI) log data were used for the log interpretation. Five sedimentary facies, A to E, were established from the EMI log interpretation. Significant correlations between the sedimentary facies, the chemical contents, the natural $$gamma$$ ray level, and the electric conductivity in the diatomaceous mudstone were seen. Spatial distribution of the diatomaceous mudstone, in lithology and thickness, was recognized through borehole correlation, which seems to reflect the sedimentary environment change.

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