Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (5): 8-12.doi: 10.3969/j.issn.1673-8926.2013.05.002

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Improvements of seismic coherence measure and an integrated use of this attribute for studying fracture reservoirs in the Donets Basin, Ukraine

Yuriy Tyapkin1， Iana Mendrii2   

  1. （1. Department of Petroleum and Gas， Naukanaftogaz Institute， Kiev 08132， Ukraine；2. Department of Geology， National Mining University， Dnipropetrovsk 49027， Ukraine）
  • Online:2013-09-26 Published:2013-09-26

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Abstract:

Seismic coherence is a popular attribute intended to image discontinuities caused by variations in structure, stratigraphy, lithology, porosity, and the presence of hydrocarbons. We improve the technology of computing and utilizing this attribute. After analyzing the relation of this attribute to the supposed mathematical model of seismic data, we present a newmethod for estimating coherence. It is based on a more realistic data model that permits arbitrary variations of both signal amplitudes and noise variances between the traces participating in coherence calculation. Moreover, a generalized approach to enhance the horizontal resolving power of any coherence measure is suggested. The newmethods are tested on synthetic data. Moreover, in combination with another seismic attribute, curvature, the new coherence measure is used for studying coalbed-methane-bearing fracture reservoirs in the Donets Basin ofUkraine.

Key words: oil sand, reservoir characteristics, diagenesis, Shaximiao Formation, northwestern Sichuan

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