GeoBaikal 2016

The report presents the lithologic and petrophysical modeling results of complex clastic rocks at Chona fields group. The detailed study of the core is a basis for modeling. For the first time a methodical basis was created for quantitative interpretation of logging.

Although extensive studies have been conducted on the shale reservoir in recent years, little work has been focused on argillaceous dolomite. In this paper, microscopic pore structure in the argillaceous dolomite reservoir in the Xingouzui Formation from the Jianghan Basin has been undertaken to further the understanding of shale oil storage mechanism in these rocks.

SEM calibration method and MIP are feasible methods in the quantitative characterization of microscopic pore structure. Inorganic pores dominate in the argillaceous dolomite reservoir, and there also exist a small amount of organic pores. Compared with the mudstones, the argillaceous dolomites have relatively higher porosity values. Pores in the argillaceous dolomite have relatively large throat radii in the range of 25.5nm to 253.0nm making a great contribution to porosity, while pores with smaller throat radii (below 22.4nm) mainly contribute to porosity in the mudstones.

Vendian-Cambrian carbonate reservoirs of Chonsky fields are discussed. The main objectives of research: material-genetic differentiation of object; elaboration of typification criteria according GIS and the core study results; a forecast of the productive areas.

Western Siberian Paleozoic deposits are the most poorly understood within the West Siberian oil and gas basin. At the same time, it is difficult to study because of the complex geological structure and hydrodynamic conditions. Commercial oil and gas content of these deposits proved in different Western Siberian regions. In the Paleozoic deposits of the regions southeast part was discovered the oil, gas and condensate accumulations including Archin and Urman fields.

Although a significant volume of 3D seismic has been acquired in recent years, allowing to identify promising and productive petroleum prospects with high accuracy, the most part of the Nepa Botuoba anteclise (NBA) area is covered only by 2D seismic of different years of acquisition and different qualities. Detailed prediction of prospects in carbonate interval by 2D seismic data only is complicated due to a wave pattern influence by the surface conditions and anomalies in shallow and middle sections. For this reason, it is necessary to determine criteria for identification of HC promising accumulations using archived and modern 2D seismic data on the basis of interpretation results of modern 3D seismic data and exploration wells drilling results. This report presents key prospects identified in carbonate interval of NBA, as well as criteria and examples of their identification and mapping by 2D seismic data. A significant number of promising objects has been found using the selected criteria within the area of studies, including: erosional remnants of the basement, reef build-ups, Tyrian formation prospects.

In this article, on site monitoring example for the construction of nuclear power plants have been identified key factors that characterize the level of technogenic loading facilities. The method of assessment of Geodynamics geological structure based on the identification parameters of its transfer function using the vertical geoelectric sounding. It is noted that the geoelectric sounding geodynamic object is a four-pole configuration, the electrical parameters of which depend on the electromagnetic properties of the medium, it is possible to register on the geodynamics of the test object changes the values of these properties. It is proved that by elementary geoelectric models, it is possible to carry out an approximation of the geoelectric section of any complexity. Identified the optimum area of the geoelectric monitoring.

Abstract presents brief description of integration data approach using results of geophysical data interpretation (3D CDP, 3D TEM, log data) for prediction of reservoirs situration based on petrophysic and expected parameters. Final result is comprehensive model of perspective objects architecture.

In this report, the authors demonstrate examples of the using of unconventional complex of geophysical methods for underground water survey in complicated geological settings of rocky regions. As a result of these surveys the all objectives of the projects were successfully resolved.

This technology consists of the following: 1) At the first stage the express radon survey must be carried on in the entire survey area in order to localize faults and allocate the prospective areas associated with them for setting detailed works; 2) At the second stage detailed studies of selected prospective areas are carried out by resonans-acoustic profiling in order to localize fractured zones as the most likely reservoirs for groundwater; 3) At the third stage the fractured zones undergo grading in accordance with their watery by transient electromagnetic method.

This complex of works with a much higher efficiency is performed in a shorter time than it is accepted in the geophysical community. As a result of office analysis the best locations for drilling water wells are chosen.

The relevance of this technology is especially apparent in the current difficult economic situation in Russia.

The paper proposes the approach to multidimensional inversion of transient electromagnetic sounding data, which is based on recovering both the conductivity and geometric parameters of the investigated geological medium. The approach is based on finite element 3D modeling and rigorous nonlinear inversion. The approach uses a few parameters in order to describe the complex geological medium. This allows us to decrease not only the computational costs but also the equivalence, and, therefore, to provide a more stable convergence of inversion. The proposed approach makes it possible to perform the inversion both without using a prior data about the structure of the investigated medium and with the use of the seismic information about geometry of layers. The workability of the approach is demonstrated by means of the synthetic data obtained for the model of a geological medium containing three lateral heterogeneous conductive layers at different depths. The possibility of correct recovering the structure of the deep target conductive layer overlapped by two lateral heterogeneous layers with changing in depth borders is shown.

In today’s complex geological, geochemical and geophysical studies in the search for ore minerals there is an urgent need for a direct method, which allows to identify zones of sulphide mineralization, including those located in high-resistivity surroundings. Due to the simultaneous use of the effects of electromagnetic induction and induced polarization, the technology of electromagnetic sounding and induced polarization (EMS-IP) defines the shape of transition process for the line-line setup. As part of the testing EMS-IP technology in October 2015 in the Republic of Altay, during the complex geological and geophysical studies of ore fields experimental and methodical works were performed. 853 physical points were recorded on an area about 2 km2, with a step on the profile of 25m and the distance between the profiles of 100 m. As a result of the inversion of three-dimensional non-stationary electromagnetic fields contrasting by polarizability objects were identified, which are more likely correspond to gold-ore occurrences, which is confirmed by lithogeochemical shooting.