881 results about "Seismology" patented technology

A method for efficient inversion of measured geophysical data from a subsurface region to prospect for hydrocarbons. Gathers of measured data (40) are encoded (60) using a set of non-equivalent encoding functions (30). Then all data records in each encoded gather that correspond to a single receiver are summed (60), repeating for each receiver to generate a simultaneous encoded gather (80). The method employs iterative, local optimization of a cost function to invert the encoded gathers of simultaneous source data. An adjoint method is used to calculate the gradients of the cost function needed for the local optimization process (100). The inverted data yields a physical properties model (110) of the subsurface region that, after iterative updating, can indicate presence of accumulations of hydrocarbons.

The method and system of the present inventions provides a new approach for selecting frequencies comprising a minimal or limited frequency data set for imaging leading to an order of magnitude decrease in computation resources. Seismic data are acquired and transformed a frequency domain. The data may be gathered in any manner. A plurality of minimal frequency subsets are formed comprising selected frequencies. The frequencies may be selected so that more frequencies are selected for shallower image positions. The selected frequencies are imaged to form frequency images. The selected frequencies may be individually weighted to assure a full and balanced bandwidth. The frequency images are composited to form an intermediate or final composited migration image.

The invention discloses a geological prediction system for constructing a tunnel passing through coal measure strata. The condition of the tunnel passing through the coal measure strata is specifically analyzed in a way of geological record, geophysical prospecting analysis or advance borehole according to specific condition based on macroscopic analysis which is adopted in sequence; the obtained information is classified so as to predict the geological condition of a main job and the geologic hazard of the coal measure strata; and the correlative information and data are used for completing the construction of the geological prediction system for constructing tunnel passing through coal measure strata. The invention provides a system for perfectly and exactly predicting the geology for constructing the tunnel passing through coal measure strata.

Disclosed is an echelon utilization battery pack with good seismic resistance. The echelon utilization battery pack involves a battery pack body and a battery, wherein the battery pack body is of a hollow cuboid structure, fixed seats are fixed at two ends of the inner bottom of the battery pack body, first fixed shafts are fixed between the two fixed seats, the first fixed shafts are slidably connected with a mounting seat in a sleeving mode, a first sliding groove is formed in the top of the mounting seat, second fixed shafts are fixed in the first sliding groove, and the two ends of the second fixed shafts are slidably connected with first sliding blocks.

Methods and apparatus facilitating radial profiling of shear slowness or shear modulus c₆₆ in the cross-sectional plane of a borehole in an anisotropic formation with the vertical X₃-axis are disclosed. According to some aspects of the invention, sonic tool bias is accounted for and removed from radial profiles. According to some aspects, sonic tool bias is accounted for by modeling the sonic tool as a heavy-fluid.

A system and methods for acquiring seismic data is provided. In one aspect, the system and methods utilize a plurality of field service units placed over a region of interest, a repeater unit that wirelessly communicates with the field service units and a remote unit for controlling and processing the seismic data acquired by the field service units. In one aspect, the system and methods determine a condition associated with each of a plurality of attributes relating to acquisition of the seismic data at each field service unit, generate messages at each field service unit when the condition of a particular attribute meets a selected criterion, transmit the generated messages, receive the messages transmitted by at least a group of field service units at a repeater unit placed in the region of interest, analyze the messages received from the group of field service units at the repeater unit and then transmit information relating to the received messages to the remote unit for further processing. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

A safe early warning method and device for full-section tunneling of a tunnel featuring dynamic water and weak surrounding rock, comprising establishing a dynamic coordinate system with an origin thereof moving along a tunnel excavation line, recording the moving distance of the origin, conducting three-dimensional laser scanning with the origin as a center to obtain point cloud data including coordinate data, collecting surrounding rock data; conducting deformation fitting on the point cloud data, calculating a fitting residual error, removing a noisy point, and conducting preprocessing; combining data of preprocessed point cloud, surrounding rock, and the tunnel excavation line to construct a tunnel excavation dynamic model; conducting stress analysis according to the model and determining whether to send out a safety early warning signal. The device comprises a three-dimensional laser scanner, a geological radar device, a displacement module, an industrial computer, a data transmission module, an alarm, and a server.

When a signal detection section detects a signal of an earthquake early warning, a control section (i) causes a storage apparatus to store display information being displayed on a display apparatus, (ii) reads, out of the storage apparatus, information on instructions in the event of an earthquake and an evacuation map in the event of an earthquake, (iii) causes the display apparatus to display: information on the instructions and the evacuation map; and information on the earthquake early warning and (iv) causes a printing apparatus to print the information on the instructions and the evacuation map. This allows a user to be appropriately evacuated from an installation site of the display apparatus.

The invention provides a method and a device for attenuating interbed multiples during the process of processing marine seismic data. The method comprises the following steps of preprocessing original seismic records to obtain preprocessed seismic records PPR (x, z0; t); overlapping the dynamically-corrected seismic records and obtaining the location of a strong reflecting interface L in which the interbed multiples are generated on the overlapped section; picking up primary reflection waves generated by the interface L from the dynamically-corrected seismic records, and correcting the primary reflection waves inversely and dynamically to obtain a second wave field item P2 (x, z0; t); deleting a reflected wave field above the interface L from the dynamically-corrected seismic records according to the location of the interface L, and carrying out inverse dynamic correction to obtain a first wave field item P1 (x, z0; t); setting a third wave field item P3 (x, z0; t) to be equal to the first wave field item; carrying out calculation according to the first wave field item P1 (x, z0; w), the second wave field item P2 (x, z0; w) and the third wave field item P3 (x, z0; w) to obtain the interbed multiples PLM (x, z0; w) relevant with the interface L; and attenuating the interbed multiples PLM (x, z0; t) of a time domain from the preprocessed seismic records PPR (x, z0; t) to obtain the records PME (x, z0; t) of the attenuated interbed multiples. By the adoption of the method and the device for attenuating the interbed multiples during the process of the processing marine seismic data, as the interbed multiples are predicted and attenuated only through data driving, independent of the precision of a velocity field, the processing quality of the marine seismic data is improved.

Methods and apparatus facilitating radial profiling of acoustic slowness of a formation traversed by a borehole are disclosed. According to some aspects of the invention, a radial slowness profile is imaged, including an image of altered region slowness.

The invention provides a method for predicting, preventing and controlling earth surface residual movement and deformation caused by a newly-built building in an old mining area. The prediction method is based on a mining parameter, which is obtained by geophysical prospecting, of an old mining area by an EH4 conductivity imaging system controlled by taking a mining map or geological drilling as geophysical prospecting analysis before the building is newly built, a traditional strata displacement parameter in Chine and a result of leveling carried out to an earth surface strike line when the newly-built building is about to be built on the earth surface of the old mining area; prediction targets are earth surface residual sinking, earth surface residual tilting deformation, earth surface residual curvature deformation, earth surface residual horizontal movement and earth surface residual horizontal deformation. Problems that parameters are insufficient and new parameters are difficult to popularize when people predict at present are solved, a damage level of the earth surface newly-built building in the old mining area can be evaluated, and a foundation (old mining area) grouting implementation method capable of preventing and treating earth surface residual movement and deformation is adopted for the newly-built building in advance. The method comprises a technological process of goaf grouting engineering by earth, grouting materials, serous fluid ratios and the like.

The invention relates to the technical field of geological disaster monitoring, in particular to a mine side slope deformation monitoring and early warning system and an early warning method thereof. The early warning system is composed of a ground control subsystem, a space wireless communication network and a communication auxiliary subsystem of monitoring workers, wherein the ground control subsystem, the space wireless communication network and the communication auxiliary subsystem are used for carrying out communication connection. The ground control subsystem is composed of a GPS mine side slope monitoring subsystem and a GPS monitoring data processing subsystem. The GPS monitoring mine side slope subsystem comprises a set of displacement measuring robots, a receiving antenna, a data transmission module, a GPS receiver and a power supply system, wherein the GPS receiver is used for receiving mine side slope deformation data collected by the displacement measuring robots. Various data are collected in real time, the monitoring data are processed, and the uploaded data are fast and automatically stored, transmitted, updated, counted and managed. The mine side slope deformation monitoring and early warning system has the advantages that the mine side slope displacement is dynamically monitored in real time, and safety production of a mine is guaranteed.

The invention relates to a site stratum three-dimensional geological structure model generation method for natural foundation replacement quantities calculation, for solving the defect of tedious and subjective foundation replacement quantities calculation compared to the prior art. The method comprises the following steps: preprocessing original data, collecting site exploration hole data and topographic map data, and performing interpretation preprocessing on the exploration hole data and the topographic map data; establishing an initial triangle network model, performing interpolation calculation on preprocessed data, and preliminarily generating an irregular triangle curved surface and a landform fluctuating curved surface; establishing stratum information of virtual borings, inserting the virtual borings, and fitting the stratum information of the virtual borings corresponding to a standard stratum; and generating an site three-dimensional geological structure model, through combination with curved-surface data of each stratum and the landform fluctuating curved surface, setting side restriction conditions, and generating a triangular-prism-element-based three-dimensional model. The method provided by the invention greatly improves the work efficiency and eliminates manual calculation errors.

The present invention provides a method of determining a property of an earth formation using an acoustic logging tool on a bottomhole assembly (BHA) in a borehole in the earth formation. At least one transmitter is used in the acoustic logging tool for generating acoustic signals into the formation at a first depth of the BHA. A plurality of receivers is used on the logging tool for receiving signals indicative of a parameter of interest. The plurality of receivers are spaced apart axially from the at least one transmitter. The measurements are repeated at least one additional depth of the BHA. The signals at the first depth and subsequent additional depths are sorted into at least one of (i) a common receiver gather, (ii) a common offset gather, and, (iii) a common-midpoint gather, giving re-sorted signals. The re-sorted signals are processed to obtain the parameter of interest.

A method of determining an optimal flare spacing for streamers towed behind a seismic vessel comprising the steps of: using a computer specially adapted with a seismic data analysis package to analyze prior seismic data for a survey area; analyzing migration broadcast patterns to estimate a maximum sampling distance; calculating a wavelet expansion as a function of flare spacing; creating synthetic gaps in the prior seismic data coverage by dropping traces at different flare spacing; testing capability of different interpolation algorithms in the seismic data analysis package to close the synthetic gaps; and determining an optimal flare spacing based upon the capability of the different interpolation algorithms to close the synthetic gaps.

The invention discloses a multi-channel matching tracking method based on seismic data. The method includes the steps that based on other seismic channels adjacent to one single seismic channel fL(t) in one group of seismic channels {f1(t), f2(t), ... , fL(t)}, the single seismic channel fL(t) is decomposed many times according to the equation (2) so as to obtain a plurality of sub waves with the formula shown in the specifications, the sub wave with the formula shown in the specifications is obtained in the nth decomposing, is the basic sub wave shared by all the seismic channels in the group of seismic channels {f1(t), f2(t), ... , fL(t)}, and is in the mode of the Morlet sub wave, L is the number of the seismic channels in the group of seismic channels, N is the decomposing number, n is an integer from 1 to N, a{l, n} is the amplitude of the wavelet obtained in the nth decomposing, and R<N> fL(t) is the final remaining seismic channel. The nth decomposing includes the steps that an initial basic sub wave is calculated with a single channel matching method; second, fine calculating is performed on the initial basic sub wave with the multi-channel matching tracking method; third, the amplitude of each sub wave is calculated.

In the present invention, the efficiency of surface artillery record deviation can be increased by several times over and the quality of image forming can be held high through spreading plane wave seismic origin of surface artillery and plane wave seismic origin wave field of underground lightening to be non-plane wave seismic origin and non-plane wave seismic orgin wave field of underground lightening, also applying phase coding technique and a new mixture phase coding technique onto the surface artillery record or synthetic seismic origin record of target lightening.

A method of processing seismic data so as to provide an image of a sub-surface region, comprises providing plurality of migrated shot gathers that contain information about the region, summing portions of the migrated shot gathers to provide a pilot stack, partitioning the plurality of gathers into a plurality of groups and summing the gathers in each group to provide a substack, wherein each group includes at least two migrated shots and wherein a substack is generated from each group, applying an amplitude normalization algorithm to the pilot stack so as to generate an amplitude-normalized pilot stack, calculating a weight function by comparing each substack to the normalized pilot stack, weighting each substack using the weight function so as to generate a plurality of weighted substacks, summing overlapping portions of the weighted substacks so as to generate a output stack, and using the output stack to generate an image.

A first stationary seismic receiver array is provided in a first non-vertically directed first borehole section of a first array of non-vertically directed first borehole sections, and a second stationary seismic receiver array is provided in a second non-vertically directed first borehole section of the first array of non-vertically directed first borehole sections. A seismic source assembly is moved axially through a first non-vertically directed second borehole section from at least a first position to a second position of a plurality of first borehole positions along a length of the first non-vertically directed second borehole section. The seismic source assembly contains a repeatable seismic source, which is activated when the seismic source assembly is in the first position and when the seismic source assembly is in the second position. First and second shots of seismic signals are recorded with at least each of the first and second stationary seismic receivers.

The invention relates to a drilling earthquake reference signal collection method and a device. The noise generated by the vibration of a drilling bit in the well drilling process is used as a quake source, the drilling earthquake reference signal collection device arranged under a square drilling rod is used for collecting vibration signals of the drilling bit transmitted in the drilling post direction, the collected data is sent to a reference signal monitoring host machine in a wireless way, and the data is sent to a center host machine after being processed by the reference signal monitoring host machine. The drilling earthquake reference signal collection device comprises a sensor unit (32), a wave filtering modulation unit (33), an A/D converter (35), a real-time clock unit (38), a GPS unit (40), a wireless communication unit (41), a memory unit (42) and the like, wherein each unit is placed in a pipe nipple. The device has the advantages of convenient construction, no influence on the production process of the drilling well, rigid connection with the drilling post, real-time signal transmission, good signal quality, convenient replacement of batteries and easy maintenance of a system.

The present invention provides a bi-hydrophone LOFAR (low frequency analysis record) spectrogram analysis-based target depth distinguishing method. The method includes the following steps that: 1) based on sound field data received by two hydrophones which are located above and below a spring layer respectively, LOFAR spectrograms of receiving sound intensities at the two depths are calculated; 2) a rectangular region is selected from the two obtained LOFAR spectrograms respectively, and the coordinate ranges of the two rectangular regions are the same, and two-dimensional Fourier transformation is performed on the rectangular regions, and then the integral values of the sound intensities are calculated in a transform domain according to an angle traversal mode, so that the probability density functions of interference fringe angles can be obtained; 3) the expected values of the two probability density functions are calculated, so that the difference of the two expected values can be calculated; a depth distinguishing judgment threshold angle value is set; and 4) the depth of a target is judged according to the result of the comparison of the difference of angle expected values and a judgment threshold. With the method of the invention of the invention adopted, priori information of marine environment is not required, the amount of calculation is small, and the depth of a target in a shallow sea environment with a spring layer can be distinguished.