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An Empirical Relation between Static and Dynamic Brittleness Indices
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Brittleness index is one of the critical rock mechanical properties in unconventional reservoirs. However, it has been so far difficult to be predicted. In this paper, According to the transformation of static and dynamic rock mechanics parameters, an empirical relation between static and dynamic brittleness indices is proposed via well logs. The selected study area is tight oil reservoirs in Lucaogou Formation, Permian, Jimusaer Sag, Junggar Basin, China. Firstly, static Young’s modulus, static Poisson’s ratio and petrophysical parameters of 19 core samples were measured. Secondly, in combination of the measured and calculated results, the empirical relation between static and dynamic brittleness indices is built based on the influence of porosity and clay content. The contrast of the predicted brittleness indices and measured results shows that the model has high accuracy. Finally, the above improved models are applied to formation evaluation via well logs, which indicates a better application effect. The brittleness index prediction method of tight oil reservoirs is improved in this research. It is importance in the optimization of fracturing layer and fracturing construction scheme and the improvement of oil recovery.