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Abstract

Summary

Brittleness (B) and total organic carbon (TOC) estimations are required to identify and produce unconventional resources like gas and oil-bearing shales and tight sands with near zero or no permeability. B is the key property for horizontal well placement, and fracture development and sustainability assessments because fracturing required for production. Conventionally B is estimated from Young’s modulus (E) and Poisson’s ratio (□).

As E is a function of density (□), field wise B estimation from E (BE) after seismic inversion may be compromised because □ is the poorest estimate compared to acoustic impedance (AI) and shear impedance (SI). We introduced a simple quantitatively equivalent BE computation using E□. We also showed that it is preferable to use the average B estimation from E□ and μρ rather than the BE and □ brittleness (B_) average.

The examples of B and TOC estimation first from the well logs, then the rock parameters inverted from 3D land seismic data successfully mapped a brittle shale zone. Core analysis made at another well on the same target shale in this study showed that it is a source rock with API 42o, porosity > 4 %, Sw > 50 % and TOC > 2 %wt.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201702563
2017-11-05
2024-04-25

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201702563
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Brittleness Computation Without Density For Unconventional Resource Exploration And Development
Conference Proceedings 2017, 1 (2017); https://doi.org/10.3997/2214-4609.201702563
/content/papers/10.3997/2214-4609.201702563
/content/papers/10.3997/2214-4609.201702563
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