Study on the Mechanism of Geostress Difference Effect on Tig
Formation resistivity of tight sandstone in the Keshen area of the Tarim oil field is greatly affected by geostress. Fluid identification and the accuracy of water saturation calculations are drastically affected by significant increases in rock resistivity resulting from geostress. In this paper, the rock constitutive relation (i.e., the relationship between stress and strain) calculation method of geotechnical structural mechanics and electric field theorem and the finite element method (FEM) numerical simulation are applied to study the effective mechanism of geostress difference on rock resistivity, and a method of geostress correction for rock resistivity is proposed. The paper explains why resistivity increases significantly with the horizontal geostress difference in the water bearing layer subject to the high geostress of the Keshen area, and also establishes the basis for calculation of water saturation in the high-stress formation.
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Author(s):
Zhiying Liu, Chengguang Zhang, Gongming Zheng,Yi Xin
Company(s):
Yangtze University, Well Log Center of PetroChina Tarim Oilfield Company
Year:
2018