Important stages in the development of electromagnetic logging tools based on national and foreign literature are considered: adaptation of traditional tools to logging while drilling and modification of tools for logging while drilling in order to provide the possibility of carrying out deeper and azimuthal measurements. Applied algorithms for modeling and interpreting data are briefly described, examples of tools which are used while drilling oil wells, including the national tool, are given.
The world experience of using electrical exploration methods in the study of technogenic bodies is considered, in particular: determining the zoning of tailings, groundwater migration routes and the stability of dams. The ongoing research demonstrates the high efficiency of combining the methods of geophysics, geochemistry, and hydrology. On the example of mining dumps located on the territory of the Kemerovo region and the Republic of Tyva, the achievements of the interdisciplinary team of the IPGG SB RAS are shown. The use of electrical resistivity tomography and magnetic prospecting in combination with geochemical mapping and gas survey made it possible to reveal the internal structure of tailings and dumps, outline watered horizons, and determine the transport of highly mineralized solutions to groundwater. Obtained results became the basis for creating a methodology for a comprehensive study of tailings and dumps, assessing the danger of technogenic bodies, and developing methods for minimizing their impact on the environment and the population of settlements.
A new approach to mass-spectrometric determination of the combined isotopic composition of methane has been put forward. The approach is based on the preliminary on-line conversion of methane to methanol in corona discharge and selective chemical ionization. The approach provides means to lower requirements for equipment, consumables, and operation conditions and offers a challenge to develop a new field method.
The paper considers the estimation of the attenuation parameter using the method of spectral ratios. Based on model and real data, it is shown that in order to obtain stable estimates, it is necessary to have the most complete information about the structure-velocity characteristics of the medium. Also, an important aspect of data preprocessing is to take into account changes in the waveform associated with the transmission medium.
The article deals with issues related to the development of seismological equipment and software, in relation to the study of seismic emission as a harbinger of destructive deformations of the side of a coal quarry. Examples of recordings of typical seismic impacts are given. The filtering and event selection algorithms used in the processing of records are shown.
The issues of choosing materials for creating physical models into seismic exploration are considered. The main attention is paid to the correspondence of the acoustic parameters of the materials used in the preparation of the model to the properties of the rocks of the real medium. A technique is proposed for measuring the attenuation coefficient in materials that serve as the main elements of the formed physical model.
The features of creating a procedure for surface-consistent amplitude correction using factors decomposition approaches are considered. The possibility of changing the models used is demonstrated, which makes it possible to choose the optimal models that have the best correspondence to the processed seismic material within the framework of the problem being solved. The effect of energy values related to different time intervals containing signals on the quality of the obtained factor estimates is studied. The procedure was tested on models and real data. It demonstrated the capabilities of the developed procedure and the correspondence of the results obtained by it to existing world-class software products.
The paper proposes a scheme of numerical experiment to assess the quality of interpretation of logging signals using a digital model of the oil reservoir, including geological, petrophysical, and physical parameters of the environment and interrelated modeling in the ATLAS MPhM system of physical processes occurring in the near-well space. The confidence intervals of oil saturation obtained as a result of interpretation of noisy synthetic logging curves for models with low and high resistivity are estimated.
