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Seismic Survey Technologies
Guidelines for Authors
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Регуляризация в многомерном анализе сейсмограмм общей точки изображения
Multidimensional residual moveout analysis yields more stable moveout parameter estimation in comparison with traditional methods. But because this analysis is a procedure of the inverse problem solution, it also requires some regularization terms using. We propose an approach for such regularization. In this paper we describe mathematically a strategy for the regularized solution, for the optimal regularization factor definition. The algorithm is tested for synthetic and field data.
Stable moveout distribution makes easier the velocity model building procedure. And also it improves image quality.
О некоторых проблемах методов мультифокусинга и общей отражающей поверхности. Часть 2. Накапливание и скорости
Here we investigate the topic of time domain imaging and velocity evalution for common reflection surface (CRS) and multifocusing (MF) methods. It is showed that isochrones appear during stacking of time’s section for both methods in similar manner as for restock migration. It is analyzed the influence of the isochrones on the decreasing of the signal to noise ratio and decrease of fold rate and offset. We demonstrate the difficulties of time domain imaging through the isochrones which arise in disjunctive strata. Here we show that without of knowledge macro-velocity model it is possible to determinate only a velocity which related to the approximation of time field in the vicinity of a central point. This determination of above mentioned velocities allows to rely stacking velocities (MF&CRS) near to root-mean-square (RMS) velocity only in plain media with layering conformity and even velocity within each layer. We give here the approach for investigation of the stacking for MF. This approach allows to reveal and analyze main factors influencing on determination of velocity in the multifocusing. Here discovered also that unlike influence of named factors leads to velocity definition uncertainly and complicate correlation of this velocity to rms velocity. Attempt of solving this problem through stacking gathers which differ small from so called pseudo-common reflection point gather(CRP) is analyzed here. It makes pseudo-CRP gathers as principal for MF as like CMP gather for CMP method. In complicated geological conditions this approach not guarantee improvement of the velocity analysis in regards of certainty compared to CMP method but leads to fold increasing at near offsets.
M.I. Protasov *, A. S. Serdyukov**, V.A. Tcheverda *
Optimal parameterization of transversely isotropic medium for inversion of the first arrival times of the offset vertical seismic profiling data
For the offset vertical seismic profiling acquisition system, the optimal parameterization is defined in the vertical transversely isotropic medium for inversion of the first arrival times of qp-waves in the linear approximation. On the basis of the analysis of singular value decomposition it is shown that only Schoenberg parameterization ( qp-wave velocity in the vertical direction, ellipticity and anellipticity of the wave surface) gives an indication of the presence of anisotropy of the medium in the illuminated area . The other two parameterization (elastic moduli and Thomsen parameterization) for this problem only give reliable information about the variability of the qp-wave propagation velocities in the vertical direction, but not the presence of anisotropy of the medium.
*IPGG SB RAS, NOVOSIBIRSK,
**Novosibirsk State University
Определение параметров трещин и пор карбонатных коллекторов по данным волнового акустического каротажа
For carbonate oil bearing reservoir rocks, a method has been developed allowing one to determine the shape and volume concentration of hydraulically connected voids (sub-vertical cracks and chaotically oriented pores) from logging data provided by the dipole sonic tool. The method is based on the effective medium theory that makes it possible to relate the macroscopic physical properties with the properties of constituents, their shape, volume concentration, orientation, and connectivity. The method is applicable for the both vertical and inclined wellbores. In the latter case, the angle between the wellbore and crack plane should not exceed 33 degrees. If the carbonate reservoir contains horizontal or inclined clay layers, the applicability of the method is restricted to the angles between the wellbore and crack plane not exceeding 20 degrees. The method provides the distribution functions of pore and crack
volume over their aspect ratios. For inclined wellbore, a possibility exists to reconstruct a value characterizing the shear-wave splitting if the wellbore were vertical.
Изучение нефтегазовых коллекторов на основе признака повышенного затухания сейсмических волн
Применение метода виртуальных источников к головным волнам
The original applications of the Virtual Source Method (VSM) concentrate on imaging and monitoring through complex and changing overburden. This can be accomplished by correlating the wavefields recorded by downhole geophones. There is number of reasons to expect even better results when this concept is extended to using head waves for reservoir imaging and monitoring purposes. Being compared with a reflection survey head waves have less strict requirements for the surface sources placements providing data for substantially larger areas. Head wave have also shown high sensitivity to reservoir changes and therefore could be considered as a useful tool for the time-lapse monitoring.
Методика коррекции сейсмоструктурных построений за длиннопериодные погрешности, обусловленные влиянием неоднородностей ВЧР
Комплексная структурная интерпретация данных сейсморазведки МОГТ и результатов ВСП и ГИС
In the report VSP, well velocity survey and GIS data more than for 700 wells of the south part of the Siberian platform were received. 2D velocity models were constructed and analyzed from the point of view of geology. Main elements in the formation of the sedimentary cover were determined. To specify region structure a structurally tectonic volume containing velocity value. It with trap intrusion were taken into account. In the particular example it is demonstrated, that data interpretation of CMP method detailed of aprioristic velocity models.
О технологии сейсмических исследований глубоководных районов дна Северного Ледовитого океана
The article gives an overview of a conceptual framework on the problem of natural resources base (NRB) development in the water area of the Arctic Ocean, in the area of high latitudes with a powerful ice covering. The area undoubtedly provides favorable prospects for the significant growth of the number of rich hydrocarbon basins, which is based on the Geosaliton Concept of the Earth. The option of development of specialized system of a seismic location with equipment to be placed on a conversion nuclear submarine is offered. Several variants of realization of the project are discussed, namely methods of radiation, reception, coordinate binding and data processing.
Геосолитонный механизм образования клиноформных ловушек углеводородов в Западной Сибири и технология их разведки
This article gives an overview of the main characteristics of formation of wedge-form Achimov sediments of Neocomian in Western Siberia. The article highlights the leading place of tectonic Geosaliton processes, related to decontamination of the Earth, in the process of formation of the fractured-pore reservoirs of Achimov strata with high filtration - capacitive features. Also the article proves the importance of high-precision seismic surveys in forecasting the placement of high-flow-rate wells in reservoirs of Achimov sediments. The new two-level technology of seismic surveys for mapping wedge-form traps of hydrocarbons is offered.
V. D. Suvorov*, E. A. Melnik*, V. M. Fomin**
Regional 3D-structure of the basement according to the first arrivals seismic waves in Western part of the Yakutian kimberlite province
We present the new results about basement structure obtained by two-dimensional ray tracing modelling 3-dimentional regional seismic data. Contrasting velocity anomalies on the uppermost basement and uplift of refraction boundary, traced at depths of 3-12 km are allocated beneath Mirnyi kimberlite field and on the area in midstream of Ygyatta River. Using these seismic anomalies we forecast of the area to find new kimberlite field.
*IPGG SB RAS, NOVOSIBIRSK
**BOTUOBUYA TEAM OF JOINT-STOCK COMPANY "ALROSA", MIRNYI
Физическое моделирование порово-трещинных объектов c возможностью тестирования сейсмических технологий
E. I. Mashinskii
Amplitude-frequency characteristics of P- and S-wave attenuation
The dependence of
-wave attenuation on strain amplitude and frequency has been studied in dry and water-saturated sandstone samples under confining pressure of 20 MPa. Attenuation of
- reflections was measured at a frequency of 1 MHz in a strain range of ε ~ (0.3 - 2.0)· 10-6. It is established that the compressional wave attenuation, QP 1 in the dry sandstone and shear wave attenuation, QS 1 in the dry and water-saturated sandstone decreases with increasing of the strain amplitude. The QP 1 in the water-saturated sandstone is not dependent on the strain amplitude. The QP 1/ QS 1 ratios for the dry and water-saturated condition strongly differ but in both cases they increase with the strain amplitude. Relaxation spectrum attenuation (RSA) of
- wave in comparison with
- wave attenuation is more sensitive to the water saturation. The change in the strain amplitude value causes the RSA parameters transformation.
-wave relaxation peak width is the water-saturated indicator. Variations of this parameter with increasing amplitude amount about tens of percents. Detected amplitude effects are explained by joint action of the viscous-elastic and microplasticity mechanisms. Results can be used for improving the geological interpretation of acoustic and seismic data.
IPGG SB RAS, NOVOSIBIRSK
Оценка возможности повышения эффективности кодоимпульсного накапливания сейсмических колебаний с использованием однополярных кодов ЛИЧ
The code pulse seismic vibrations accumulator method should be considered the most significant alternative to vibroseis method. Potentials of enhancement of efficiency of the code pulse seismic prospecting with use of bi-phase codes with frequency ramp in the way of increasing time and maximum pulse repetition frequency in scanning are studied in this article with the help of mathematical modelling method. As it is shown, the increase of maximum pulse repetition frequency (Fmax) with the use of uni-polar scanning (frequency ramp) up to 80 Hz and more creates principle possibilities to increase temporary resolution ratio of the code pulse method up to the level of scanning capacity of vibroseis method.
Сейсмический контроль состояния подземных гидротехнических сооружений
The article considered issues of seismic control of underground constructions condition. Based on the example of underground construction of Verkhne- Tulomskaya HPS that has been operating for 45 years and exposed to constant vibration action impact, rock mass fracture propagation near boundaries of structural blocks has been established. The regime control of contour mass state of underground constructions has been recommended.