Exploration method and system for detecting hydrocarbons by water column
SUBSTANCE: method for detecting hydrocarbons is described. The method includes obtaining seismic data associated with the water mass in the exploration area. The filter is then applied to a portion of the seismic data to amplify the diffraction anomaly signals with respect to horizontal or near horizontal signals associated with the water mass to form filtered seismic data. After filtration, the seepage sites are identified by the filtered seismic data.
EFFECT: high accuracy and reliability of the obtained data.
21 cl, 7 dwg
SUBSTANCE: in seismic survey in icy water, streamers are towed behind a vessel under the water surface to avoid collision with ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from the streamer on the surface Instead, a device is towed on the streamer under the water surface. The absolute position of the streamer is tracked by intermittently bringing the towed device towards the surface so that GPS readings can be obtained. The absolute position of the streamer can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.
EFFECT: high accuracy of survey data.
31 cl, 33 dwg
FIELD: physics; geophysics.
SUBSTANCE: invention relates to geophysics and can be used in seismic exploration to detect oil and gas deposits. The invention discloses a method and an apparatus for marine seismic survey using one or more movable marine seismic vibrators. The sweeping function for the vibrator is based on the criterion of allowable degradation and is a nonlinear function which performs frequency sweeping from top downwards. The obtained data can be used directly without cleaning or can be easily cleaned.
EFFECT: high accuracy of survey data.
21 cl, 11 dwg
FIELD: physics, geophysics.
SUBSTANCE: invention relates to geophysics and can be used for sea seismic works. Claimed are seismic streamer and related method of evaluation of the shape of seismic streamer controlled in transverse direction. This seismic streamer is divided into several adjacent sections of seismic streamer by control devices in transverse direction. Heading transducers arranged fore and aft of every section generate the data on heading. Every section is simulated as a rectangular fore and curved fore section. Section shape is evaluated in compliance with this model from the data on heading towards the section.
EFFECT: higher precision of trial data owing to precision of seismic streamer shape evaluation.
19 cl, 2 dwg
SUBSTANCE: disclosed is a small-size bottom seismic module, connected by a hydroacoustic link to a control station and consisting of a sealed housing, a hydrophysical module, a device for detecting geophysical signals, which includes a bottom seismometer, information storage means, a spatial orientation sensor, a radio buoy, a ballast, a ballast release, a release timer, a flash beacon, a radio beacon, an external communication socket and a power supply. The sealed housing has the shape of a hemisphere which is linked to the base of the sealed housing which is in the form of a plate, on the upper diameter of which there are mechanical elements of the ballast release, which are in the form of straps which are linked to the ballast, tightly adjoining the base of the sealed housing on its lower diameter. The means of communicating with the control station are in the form of a single-relay hydroacoustic link. The spatial orientation sensor consists of an electronic 3D compass, three accelerometers and three angular velocity measuring devices, rigidly linked to the bottom seismometer, and the bottom seismometer is in the form of a wideband molecular-electronic sensor.
EFFECT: high reliability of detected seismic signals.
SUBSTANCE: acoustic signal is emitted toward sea bottom. Signal of sound reradiation from water column is received. Gas flares are isolated from receive signal. Gas flare inclination is used to evaluate the stream velocity profile and direction. Density of gas flare sources on sea bottom and methane flow direction in water for every flare are calculated. Obtained data allows the determination of methane concentration in water column in the area of methane discharge.
EFFECT: higher efficiency and accuracy of evaluation.
SUBSTANCE: offered invention relates to measuring equipment and can be used for development and manufacture of oceanological multichannel information and measuring complexes and development of new measuring oceanological channels. The hydrological-optical-chemical complex contains a unit of hydrophysical measuring channels, a central controller, the first and second modems of the electric communication line, a conducting rope with electric and fibre-optical communication lines, a rotating electric transition, an electric winch, an operator workstation, a unit of optical measuring channels, and a unit of normalising controllers is added to it, and each hydrophysical measuring channel through the corresponding normalising controller is connected to the central controller, besides, the first and second multiport optical modems and the rotating optical transition are added, and each optical measuring channel is connected to the corresponding input of the first multiport optical modem connected through the fibre-optic communication line of the conducting rope to the rotating optical transition connected to the second multiport optical modem connected to the operator workstation. The information from the measuring channels of the hydrophysical module is processed by the normalising controllers, and in compact way by the central controller through the multiport modem is transferred to the onboard device of the probe, and also in creation of conditions for development, manufacture, laboratory and natural studies of new optical measuring channels for identification and registration of quantity of a mineral suspended matter and the weighed organic substance in sea water, integration of currently existing measuring oceanologic channels, creation of the combined channel of the electric and fibre-optical communication line between submersible and onboard devices.
EFFECT: integration in a single hydrological-optical-chemical complex of all available measuring channels of oceanological parameters.
FIELD: radio engineering, communication.
SUBSTANCE: invention relates to hydroacoustic equipment and to the creation of deployment-retrieval devices (DRD) of flexible extended trailing antennas (FETA) on submarines and on surface ships. The invention proposes a DRD structure in which the deployment of the antenna to the stream in case some part of the antenna is wound on a winch, and its other part is arranged in a tubular storage unit, is provided by the creation of excess pressure in the tubular storage unit by means of a centrifugal pump, a sealing device on the end face of the tubular storage unit, which is close to the winch, is made in the form of a cylindrical module of the same inner diameter as the tubular storage unit, which is rigidly and tightly attached to it, and the suction pipeline of the centrifugal pump is made of two branch pipes, one of which is directed outboard and the other one is tightly attached to the inner volume of the tubular storage unit with an additional conical flange coaxial to the tubular storage unit and installed near its fore end face between the conical flange connected to the pressure pipeline and the sealing device of the fore end face of the tubular storage unit, the conical flange of the pressure pipeline is oriented with its constriction to the aft part of the tubular storage unit, and the conical flange of the suction pipeline is oriented with its constriction to the fore part.
EFFECT: increasing the safety of deployment and retrieval of flexible extended trailing antennas, some part of which is wound on a winch of deployment and retrieval devices, and some part is located in the tubular storage unit, without its damages or stops.
FIELD: measurement equipment.
SUBSTANCE: invention relates to devices for measurement of geophysical parameters in bottom area of seas and oceans. Substance: seismic module comprises a tight body (1), inside of which there is a hard disk drive (5), a unit (7) of a hydroacoustic communication channel, a ballast (2) breaker (8), a timer (9) of the breaker (8) of ballast (2), a flashing beacon (10), a joint (11) of external communication, a source of power supply (12), a hydrophysical module (13), a radio beacon (14), a seismic sensor (15), a unit (20) of spatial orientation. Besides, the unit (20) of spatial orientation comprises an electronic 3D compass, three accelerometers and three meters of angular speeds rigidly coupled with the seismic sensor (15). The seismic detector (15) is made in the form of a wideband molecular-electronic sensor. The tight body (1) is made in the form of a hemisphere with a base in the form of a plate, along the upper diameter of which there are mechanical elements of the ballast (2) breaker (8) installed. Mechanical elements of the ballast (2) breaker (8) are made in the form of slings (3), which are coupled to ballast (2) and tightly adjoin the base of the tight body (1) along its lower diameter. The hydroacoustic communication channel for connection of the seismic module with the dispatching station is made as single-relay.
EFFECT: increased validity of recorded data.
SUBSTANCE: invention relates to ship building, particularly, to surface scientific and research vessels. Scientific and research icebreaking vessel is proposed for carrying out 3D seismic technology exploration irrespectively to ice conditions which vessel has a hull where seismic equipment is located, as well as a shaft for bay cable laying. To move source of acoustic waves untethered unmanned submersible is used which bases on a vessel and is dropped and lifted via separate vertical shaft using running - pulling tool.
EFFECT: improved operational performance of scientific and research vessel for seismic exploration.
3 cl, 1 dwg
FIELD: physics; geophysics.
SUBSTANCE: invention relates to geophysics and can be used in marine seismic prospecting. Disclosed is an underwater seismic recording system for reducing noise in seismic signals caused by reflected ghost waves or movement through the water. The system comprises two motion sensors. One sensor has a first response and sensitivity to noise caused by movement of the platform, as well as to acoustic waves. The second sensor has a different structure, which insulates the sensor from acoustic waves such that the response is primarily associated with noise caused by movement. Output data of the responses of the two sensors are combined to eliminate the effect of the noise caused by movement. Upon further combination with a hydrophone signal, noise caused by reflected ghost waves is reduced.
EFFECT: high accuracy of prospecting data.
14 cl, 19 dwg
SUBSTANCE: bore pits are drilled; acoustic emission sensors are installed in them; signals from acoustic emission sensors are recorded and processed; forecast of dangerous state of mine rock massif is evaluated as per processing results. Signal processing is performed using an analysis of arrival signs of acoustic emission pulses. Distribution of arrival signs on a stereographic projection is built for each acoustic emission source. Availability of a dangerous state of mine rock massif is evaluated, ratio of acting stresses is determined and values of angles of fall and spread for dangerous planes and directions are determined at detection of regular grouping of arrival signs of acoustic emission pulses. Coordinates of possible rock bump or mine rock massif fall are calculated as per the analysis of distribution in mine rock massive volume of arrival signs of acoustic emission pulses.
EFFECT: improving accurate and reliable determination of coordinates of possible rock bump or fall of mine rock massif.
SUBSTANCE: disclosed are methods, apparatus and computer readable medium, having a computer usable program code for identifying regions in the ground at a well site (200), based on that continuous data (902) are received from the well site (200), while reducing redundancy in the continuous data (902) received from the well site (200) to form processed data. Cluster analysis is performed (2308) using the processed data to form a set of cluster elements, where the set of cluster elements (1402) includes different types of cluster elements which identify differences between regions in the ground at the well site (200). Properties are identified for each type of cluster element in the set of cluster elements (1400) to form a model for the well site (200).
EFFECT: methods, apparatus and systems for multidimensional data analysis to identify heterogeneities in formations or regions in the ground, with simultaneous elimination or minimisation of the effect of existing problems and constraints, providing different orientation when taking lateral sample, providing visual display of zones with the best reservoir bed quality, which provides the best potential for commercial extraction for a specific well.
91 cl, 29 dwg
SUBSTANCE: set of inventions relates to safe deep mining of solid hydrocarbons. Proposed method proceeds from continuous ground monitoring of geodynamic state of massif and seismic activity of bed roof and bed working on surface area covering bed headway in real time by passive prospecting seismology methods. Obtained results are automatically processed to isolate zones with abnormally-high seismic energy emission, define their area and depth coordinates so that map of anomalies of seismic emission. Maximum magnitudes of seismic emission are used to define coordinates of slope ratio of coal bed fracturing well. Development of main cracks is forecast from the well by the method of double refraction of transverse waves from surface excitation source. After fissuring, direction of main crack development in face bulk is controlled. Area is drilled from surface in directions of main crack development to pump methane out from the wells. With seismic emission decreasing, possibility to extract coal is forecast.
EFFECT: higher safety and intensity of coal extraction.
3 cl, 3 dwg
FIELD: information technology.
SUBSTANCE: geophysical survey data are prepared by encoding a group of seismograms of a source, which uses for each seismogram a different encoding signature selected from the non-equivalent encoding signature step. Then, the encoded seismograms are summed by summing all traces corresponding to the same receiver from each seismogram, resulting in a synchronously encoded seismogram. The simulation steps needed for inversion are then calculated using a particular assumed model of velocity or other physical property and synchronously activated encoded sources using the same encoding scheme used on the measured data. The result is an updated physical properties model which may be further updated by conventional iterations.
EFFECT: faster calculations, needed for iterative inversion of geophysical data, owing to use of simulation of synchronously encoded sources at steps for simulating the inversion process.
23 cl, 10 dwg
FIELD: measuring techniques; seismic data processing techniques.
SUBSTANCE: seismic data processing technique is based on obtaining a short term seismic section in the investigated earth layer and mapping it in the form of seismic paths. From the map, we can determine characteristic dimensions of local irregular geological objects, which are subject to investigation, and corresponding dimensions of the sliding window for calculations on the seismic section, which covers the stated objects, in coordinates of seismic time t (ms) and distance x (m), in the range for which displacement of the window on the profile in the displacement cycle with the given x coordinate and seismic time, t interval: we can determine the local form of the wave packet of reflected, diffracted and scattered waves, form a digital matrix of the stated local wave packets in the range of the investigated seismic section. The dynamic characteristics, in particular spectral and energy characteristics are determined from the obtained digital matrix of local wave packets. Reflecting properties of the investigated earth layer are determined from these characteristics.
EFFECT: increased information content of the results of processing intratelluric seismic data when investigating complex heterogeneous media of the Earth's crust and the upper mantle; increased effectiveness of seismic exploration.
3 cl, 9 dwg
FIELD: geophysics, possible use for processing large volumes of seismic data in oil industry.
SUBSTANCE: in accordance to method and device for sorting large volumes of portions of seismic data in given order, portions of data are positioned in leaf files of B-tree structure and stored in appropriate area of temporary memory, appropriate for given leaf file. Filled leaf file is read into sorting memory area, where they are sorted in appropriate sub-order. All sorted data portions are dispensed in appropriate sub-orders for all filled leaf files in leaf order for creating final stream of output data, where data portions in their appropriate sub-orders for all filled leaf files in leaf order are positioned in given common order.
EFFECT: increased sorting efficiency for large volumes of seismic data.
3 cl, 9 dwg
FIELD: the invention is related to geophysics and may be used in the stratigraphy.
SUBSTANCE: proposed method is based on using the pattern, obtained by summing the continuity curves, presenting the seismic horizons. The aim of the summing consists in determining the geological layers, forming the seismic section in that state, in which they were deposited, but not in the state of their present observation. According to the proposed method it is achieved by conversion of the vertical scale of the seismic section (in the units of seismic time intervals) into the geological vertical scale (in the units of geological time intervals). The conversion is based on the flattening of histograms. The proposed method permits to determine the flattened seismic sections by using the flattened histograms. The flattened seismic sections are used for determination of the deposition rates, which had controlled the deposition of geological layers. In particular, the method permits to detect the geological faults, i.e. erosions and fall-through (gaps).
EFFECT: increased accuracy and reliability of seismostratigraphy.
4 cl, 6 dwg
FIELD: physics; geophysics.
SUBSTANCE: invention relates to geophysics and can be used to process seismic survey data. A method for reconstructing subsurface Q models (110) from seismic data (10) by performing ray-based (60), centroid frequency shift (50) Q tomography is disclosed. The amplitude spectrum of the seismic source waveform is approximated (40) by a frequency-weighted exponential function of frequency, having two selected parameters to adjust the frequency shift data, thereby providing a better fit to various asymmetric source amplitude spectra. Box constraints may be used in the optimisation procedure, and a multi-index active-set method used in velocity tomography is a preferred technique for implementing the box constraints (100).
EFFECT: high accuracy of seismic survey data.
20 cl, 12 dwg