Integration of Sonic-VSP-Seismic Data for Reservoir Elastic Properties Evaluation

Abstract

Abstract Exploration and production geoscientists use a number of characteristics reflecting such properties of reservoirs under study as structure, lithology, porosity, permeability, etc. Reliability of estimating these parameters defines effectiveness of reservoir development actions. Measuring elastic properties of formation allows computation of a number of parameters characterising reservoir's lithological properties and filtration characteristics. The information about distribution of elastic properties allows estimation of reservoir structure and elaboration of the optimal strategy for reservoir development. Certainty and reliability of the geoinformation may be dramatically increased using integration of methods, studying elastic properties of reservoir in different frequency bandwidths using seismic waves of different types – longitudinal, shear, converted. From this point of view, the integration of fullwave sonic log, multiwave VSP and surface seismic data may provide the effective solution for the task of investigating reservoir elastic properties. Integration of information obtained using these methods allows building of a single model that includes features of different ranks. Observations, which use elastic waves of different types, make it possible to additional calculate such integrated parameters as Poisson ratio and to increase certainty of estimation of such characteristics as lithology and porosity. Seismoacoustic measurements data, supplemented by log interpretation results, core analysis, hydrodynamic study results, provide a means to dramatically increase quality and certainty of the study.