Development of algorithms for isotropic petroelastic models adjustment

UDK: 550.832
DOI: 10.24887/0028-2448-2022-6-13-19
Key words: acoustic logging, rock physics model, mineral component model, reservoir properties, acoustic impedance, effective media theory
Authors: O.V. Nadezhdin (RN-BashNIPIneft LLC, RF, Ufa), I.D. Latypov (RN-BashNIPIneft LLC, RF, Ufa), A.V. Markov (RN-BashNIPIneft LLC, RF, Ufa; Bashkir State University, RF, Ufa), R.I. Makaev (RN-BashNIPIneft LLC, RF, Ufa, L.E. Koltanovskiy (Bashneft PJSOC, RF, Ufa), M.O. Chernykh (Bashneft PJSOC, RF, Ufa)

The Company annually conducts seismic surveys to study the subsoil structure, forecast the material composition and saturation of rocks. Following the growing need to study more complex reservoirs, methods for seismic data interpretation are developing. Attribute analysis and rock physics modeling have become widespread for lithology and reservoir properties forecasting in the interwell space. The basis for rock physics modeling is the mineral component model. In the mineral component model, the components are often a mixture of different minerals due to the limited range of well logging. Therefore, it is required to adjust the grouped constants while rock physics modeling. At the same time, with the basic set of seismic software tools for rock physics modeling, the adjustment of constants and coefficients in models is not automated, and manual adjustment of models is more laborious and less accurate.

This article is devoted to the development of a technique for isotropic rock physics modeling based on well logging and core data supported by inverse modeling (automatic adjustment of coefficients within constraints) to improve the forecast reliability during amplitude interpretation. An integrated approach is considered for curves preparation for amplitude interpretation and mathematic modeling for geological properties forecasting with automation of quality control processes and reliability of the obtained isotropic rock physics models. Approaches are proposed for adjusting the elastic properties in the intervals of well caverns, taking into account caliper readings. A scheme for constructing rock physics isotropic models with additional adjustment of elastic parameters within the constraints, with automated enumeration of combinations of rock physics sub models suitable for the studied section is presentes. The rock physics modeling algorithm was tested with further adjustment of elastic parameters; conclusions were drawn about improving the quality of the final model.

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