Biot’s coefficient in terrigenous section: research methods and practical significance

In the presented work the concept of Bio coefficient (poroelasticity coefficient) is described as a significant physical parameter in the theory of effective stresses used to describe the poroelastic state of rocks, as well as the interval of change in the Bio coefficient depending on the porosity and structural features of the rock matrix. An overview of the most well-known and practically significant methods for determining the values of the poroelasticity coefficient is presented: the methods of Willis, Frankut and Abass, measurements of rock permeability depending on effective stress, as well as changes in crimping pressure in relation to changes in pore pressure. A list of common correlation dependencies for estimating the poroelasticity coefficient is given. Approaches are demonstrated and procedures for special laboratory core studies are briefly described. The results of data interpretation and the establishment of correlations of values for the objects of development of one of the fields in Western Siberia are demonstrated. The correlation dependences of the Bio coefficient with respect to the filtration and capacitance properties of the formation (FES), acoustic and elastic properties of rocks for the productive intervals of the formations BU₁₆, BU₁₇, Ac_3–4, Ac₅ and Ac₆. To determine the characteristic values of the Bio coefficient in individual development objects, a method based on the construction of a span diagram is proposed («boxes with moustaches»). The presented material will be useful to geomechanical engineers in order to clarify the stress-strain state on rocks of Western Siberia that are similar in filtration-capacitance and elastic-strength properties. The results are of practical importance for ensuring the stability of boreholes and modeling hydraulic fracturing processes.

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