Abstract

Persistency in Fracture Tendency of Subsurface Biogenic Siliceous Rocks

Highlights

  • We have experimented with the use of the Hurst coefficient and have noted the autocorrelated nature of particular subterranean intervals that contain biogenic silica in various stages of diagenesis

  • Our analysis detects a persistency in the lithology data in the intervals significantly affected by the silica diagenesis

  • In subsurface chert formations containing biogenic silica that have undergone silica diagenesis, both the gamma ray log and the neutron logs are sensitive in detecting intervals with high concentration of shale bearing intervals sandwiched between the laminated chert intervals

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Summary

Introduction

In subsurface chert formations containing biogenic silica that have undergone silica diagenesis, both the gamma ray log and the neutron logs are sensitive in detecting intervals with high concentration of shale bearing intervals sandwiched between the laminated chert intervals. Our objective was detecting any systematic organization in an otherwise chaotic system. Subsurface well log data for clastic sediments resemble fΒM (fractional Brownian motion) type time series [1,2,3,4]. A prior analysis using the power spectrum for estimation of β can help in the R/S analysis of the Hurst coefficient. If β≥1, the data is considered as fΒM-like.

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