35 results about "Seismic line" patented technology

The invention provides a merging processing method of 2D seismic data of complex surfaces, belonging to the field of data processing in geophysical exploration. The method is characterized by firstly establishing a spatial model of a 2D seismic data volume, secondly carrying out field one-step static computation on the spatial model of the 2D seismic data volume, thirdly carrying out field one-step static application, pre-stack noise elimination and fidelity and consistency processing on each 2D seismic line in the spatial model and finally improving the signal to noise ratio and resolution of a target layer. The method has the following beneficial effects: by utilizing the method to carry out merging processing on the 2D seismic data acquired in different years, when the profile is processed, the depth error is smaller than the normative index, the structural features are clear, reliable and closed, and the seismic profile which has high resolution, high fidelity and high signal to noise ratio and can more clearly reflect the structure and lithological change characteristics is processed, thus providing reliable processing result for seismic interpretation.

A method for forming a helix rope for a trawl comprising the steps of: a) situating upon a portion of a rope a bead of a substance being selected from a group consisting of: (i) a liquid substance; and (ii) a semi-liquid substance. A helix rope (35) for forming portions of a pelagic trawl, the helix rope comprising a braided sheath (398) formed of greater than sixteen strands (397), whereby drag is reduced. A method for forming a high strength synthetic rope useful for towing warps, trawler warps, yachting ropes, mooring lines, anchoring lines, oil derrick anchoring lines, seismic lines, paravane lines, and any other uses for rope, cable or chain.

The invention provides a method for recovering a depositional sequence prototype section. Through sectional line drawing, splicing and combing of seismic reflection lineups, an upper super layer or a filling and supplementing interface serves as a horizontal reference layer, depositional environment information obtained by analyzing seismic facies is combined, and the continuing trend of a line drawn stratum is adopted, so that a depositional sequence is recovered to be at the depositional stage state. Through the sectional line drawing, splicing and combing of the seismic reflection lineups, namely reassembly, the sequence prototype section technology is obtained and named as the depositional sequence prototype section recovering technology through the seismic line drawing method. Through recovery of the depositional sequence prototype, the display degree of seismic data is improved greatly through arrangement of the stratum structure, the internal structure of a depositional system is clearer, and content needing displaying is more prominent.

A system and method for locating subsurface diffractors. The method operates on two-dimensional (2-D) seismic data that includes one or more 2-D seismic lines. The 2-D seismic data may be preprocessed to enhance diffracted energy. For each hypothetical diffractor location in a set of hypothetical diffractor locations, the method involves analyzing at least a subset of the seismic traces of the one or more 2-D seismic lines, in order to compute a value indicating an extent to which those seismic traces contain diffraction arrivals consistent with the hypothetical diffractor location. The method may further involve generating, storing and displaying an image (or map) based on the computed values. The image may illustrate areas of high, intermediate and low diffraction, and may be used to assess the formation.

The invention provides a method used for building a seismic data velocity model. The method comprises the steps that (A) a seismic data initial velocity model is acquired; (B) the initial velocity model is used to offset a seismic line to acquire an original offset profile; (C) each reference velocity model of the initial velocity model under at least one percentage velocity factor is acquired; (D) each reference velocity model is used to acquire a common reflection point gather; (E) the common reflection point gathers are superimposed to form a number of mini-profiles of velocity analysis points; (F) for each layer, a preferred mini-profile is determined, and the velocity of a velocity analysis point in the reference velocity model under the percentage velocity factor corresponding to the preferred mini-profile is used as the preferred offset velocity of the velocity analysis point in the corresponding layer; and (G) the preferred offset velocity of each velocity analysis point in each corresponding layer is used to replace the corresponding velocity of each velocity analysis point in the original velocity model. According to the method, the velocity accuracy of seismic data can be improved.

The invention is a field seismic data collection technique for petroleum exploration, i.e. on the condition that there is high voltage power line across seismic lines, adopting a method for eliminating monofrequent interference from seismic recording signal to collect original waveform in seismic data Si; on time section, using deep-level time segment to determine amplitude, frequency and time delay of monofrequent strong interference wave yi as monofrequent strong interference wave yi in the whole-channel seismic record, subtracting yi from Si and getting a seismic record without yi, using deep-level seismic data to estimate the monofrequent interference wave, and most effectively estimating energy of the monofrequent interference wave, thus able to furthest eliminate the frequency component of the monofrequent interference wave, avoiding the damage to an effective wave corresponding to the frequency component, and it can eliminate plural monofrequent interference waves one time.

A method for analyzing seismic data from a formation. The method may first receive two-dimensional (2-D) seismic data of a formation comprising a number of individual seismic lines acquired over an exploration area and having a large interline spacing. The 2-D seismic data may then be preprocessed to enhance diffracted energy. For each respective hypothetical diffractor location, the method may then search for coherent diffraction arrivals on nearby 2-D seismic lines consistent with the respective hypothetical diffractor location. The method may then store information regarding identified diffractor locations. The method may then create a map based on the identified diffractor locations, wherein the map illustrates areas of high diffraction. The map may then be displayed on a display, wherein the map is useable to assess the formation.

The invention belongs to a method for detecting a uranium mine, and specifically discloses a method for detecting a paleochannel type uranium mine. The method includes: four seismic lines in the shape of a Chinese character "feng" are laid; the seismic lines in the shape of the Chinese character "feng" are provided with detectors, an excitation source, and a seismograph; the excitation source is started, seismic vibration signals are generated, and the seismograph is turned on to observe seismic amplitude data received by the detectors; seismic data processing of seismic original single-shot data is performed; seismic data stratigraphic interpretation of seismic result data C is made, and stratigraphic data D is obtained; standardization processing of sound wave data and density data in a research region is performed, and the sound wave data SON_standard and the density data DEN_standard after standardization are obtained; according to C, D, SON_standardj, and DEN_standardj, wave impedance data volume [omega]res is obtained by employing jason inversion software and an inversion method based on a model; and according to the wave impedance data volume [omega]s, preferable mineralization areas of the paleochannel type uranium mine on the four seismic lines are determined. According to the method, the mineralization environment of the paleochannel type uranium mine can be rapidly, economically, and effectively detected.

The invention provides a K-line analysis method of earthquake trend. The method includes: defining an earthquake K-line, building an analytical model, drawing a map, and analyzing the map. The method making use of historical earthquake data resources has the advantages of full level of computer programming, high analytical speed and visuality of results.

A number of seismic stacks are precomputed (20) for known velocity fields. The velocity fields are chosen to span the range of velocities of interest. The stacks are then arranged (21) in the 3D memory of a graphics computer (10–14) using time and position as first dimensions and the index of the velocity field as the last dimension. In such 3D space, any velocity field to be used for stacking appears as a surface (S) within a volume. Projecting the seismic stacks onto that surface provides the seismic line stacked for the velocity field of interest.

The present invention provides a method for rapidly measuring a natural foundation rigidity coefficient. The method comprises the steps of: respectively arranging seismic lines by taking the positionof a basic center point as a center in vertical-axis and horizontal-axis directions; according to the embedded depth of foundation, determining the depth of a target layer, and extracting a vertical wave apparent velocity VP and a surface wave apparent velocity VR of the target layer in the same arrangement and the same triggering gun through adoption of the seismic exploration refraction method and the surface wave exploration principle; taking a basic length-width ratio as a variable to perform inductive statistics of an actual project to obtain compressionstiffness influence coefficients [Eta]Z, [Eta][Phi] and [Eta]X through adoption of an arithmetic mean value method; calculating a kinetic parameter Young modulus Ed and a dynamic Poisson's ratio [Sigma]d of foundation soil; and calculating a rigidity coefficient of the foundation soil. The method for rapidly measuring a natural foundation rigidity coefficient does not need an excitation device, is short in test cycle and low in test cost, simplifies the test process, improves the test efficiency, is high in precision and can be applied to engineering practice.

There is provided a system for helicopter portable drilling comprising: a drill frame, a drill mast affixed a first end of the drill frame, a drill operatively coupled to the drill mast and operable using one of compressed air, pressurized hydraulic fluid and both compressed air and pressurized hydraulic fluid and a unified power source for providing compressed air and pressurized hydraulic fluid coupled to the drill, the total operating weight of the system being approximately 3000 pounds for allowing a single-pick move by a helicopter. A method of seismic line drilling comprising the steps of placing a first single-pick drilling system at a first location with a single pick, placing a second single-pick drilling system at a second location with a single pick, when finished drilling, moving the first single-pick drilling system to a third location with a single pick, when finished drilling, moving the second single-pick drilling system to a fourth location with a single pick.

There is provided a system for helicopter portable drilling comprising: a drill frame, a drill mast affixed a first end of the drill frame, a drill operatively coupled to the drill mast and operable using one of compressed air, pressurized hydraulic fluid and both compressed air and pressurized hydraulic fluid and a unified power source for providing compressed air and pressurized hydraulic fluid coupled to the drill, the total operating weight of the system being approximately 3000 pounds for allowing a single-pick move by a helicopter. A method of seismic line drilling comprising the steps of placing a first single-pick drilling system at a first location with a single pick, placing a second single-pick drilling system at a second location with a single pick, when finished drilling, moving the first single-pick drilling system to a third location with a single pick, when finished drilling, moving the second single-pick drilling system to a fourth location with a single pick.

The invention discloses a method for separating seismic diffraction waves by median resistance filtering, which comprises the following steps: 1) reading single-shot seismic data containing m channelseach with n sampling points into a two-dimensional array R1; 2) correcting the normal time difference of the array R1 to obtain an array R2; 3) extracting the seismic data of a row of diffraction waves in the array R2 to obtain a low-cut wave number, and determining a channel window parameter of the median resistance filtering; 4) carrying out one-dimensional median resistance filtering on the data of the array R2 to obtain an array R3; 5) implementing a median resistance filtering to extract diffraction waves, and subtracting median filter array R3 from the array R2; 6) repeating steps 4 and5), performing median resistance filtering processing on each row of data in the array R2 to obtain a two-dimensional array R4, performing inverse-normal time difference correction on the extracted diffraction waves to obtain an array R5, and performing the median resistance filtering to separate the diffraction waves; 7) repeating steps 1) to 6), processing seismic line data, performing seismicmigration imaging processing on the diffraction waves to obtain a diffraction wave imaging profile. The method effectively improves the prediction accuracy of coal mine collapse columns.