17 results about "Geophysics" patented technology

Method of imaging seismic data recorded using a set of seismic receivers positioned to receive seismic responses from a subsurface formation upon activating a seismic source. The seismic responses are direction-sensitive responses. A virtual signal received by receiver k from the virtual source at the position of receiver m is determined by processing involving cross correlating at least part of the responses of a receiver m with at least part of the responses of a seismic receiver k. Part of direction-sensitive responses or part of the virtual signal that contains a component of the wave field at receiver m traveling in a first direction and part of the direction-sensitive responses or part of the virtual signal that contains a component of the wave field at the receiver k traveling in a second direction may be removed.

The invention discloses a well-ground seismic data joint acquisition system based on distributed optical fiber acoustic wave sensing and a well drive data processing method. In order to solve the problems of inconsistent energy, inconsistent frequency spectrum and incompletely consistent coupling between a seismic source and the ground caused by repeated excitation of each seismic source point when seismic data in a well and seismic data on the ground are respectively acquired in the prior art, the invention discloses an in-well-ground seismic data combined three-dimensional acquisition systemformed by a distributed optical fiber sound wave sensing seismic data acquisition unit and a ground seismic data acquisition unit. In-well-ground combined three-dimensional exploration is carried out, ground and in-well seismic data are synchronously collected, the high-density, high-benefit, high-resolution and low-cost well-ground combined three-dimensional seismic exploration technology is achieved, and oil and gas resource exploration and comprehensive evaluation are carried out.

The invention provides a magnetic induction through-the-earth positioning method based on path loss, and belongs to the technical field of magnetic induction through-the-earth positioning. According to the method, the horizontal distance between the transmitter and the receivers is calculated by utilizing the geometrical relationship between the intersection points of the central axes of the two receivers and a transmitter coil on the ground and the ground, the corresponding relation between the magnetic induction through-the-earth positioning signal intensity at a certain point on the groundunder a rectangular coordinate system and the depth from the underground transmitter to the ground is derived, and the distance between the transmitter and the ground is determined according to the magnetic induction through-the-earth positioning signal intensity at the certain point on the ground, so that the vertical depth positioning based on path loss is achieved. According to the method, thechange rules of the horizontal component, the vertical component and the sum vector of the through-the-ground positioning signal along with the distance between the underground transmitter and the ground is analyzed, the one-to-one correspondence relationship between the positioning signal and the vector and the depth between the transmitter and the ground is established, and more accurate through-the-ground positioning of the signal attenuation based on a ground medium is realized.

The invention relates to a molecular-level-based rock micro-structure and property research method which comprises the following steps of: obtaining main mineral components of rock through an X-ray diffraction test so as to obtain a crystal structure of the main mineral components of the rock; then calculating chemical bond parameters of the main mineral crystals, analyzing and verifying a calculation result, calculating elastic parameters of the mineral crystals, and analyzing and verifying the calculation result; and carrying out correlation analysis according to chemical bonds and elastic parameters of the mineral crystals. According to the research method provided by the invention, the microscopic characteristics of the rock are researched from the molecular level, and a theoretical basis is provided for revealing the microscopic essential mechanism of the macroscopic physical and mechanical properties of the rock. Research results not only provide theoretical support for rock engineering and slope reinforcement engineering, but also have important significance for stone cultural relic protection.

The invention discloses a quantitative evaluation method suitable for the borehole wall stability of a horizontal section of deep shale gas. The quantitative evaluation method comprises the following steps: 1, quantitatively calculating formation collapse and fracture pressure; 2, quantitatively representing uncertainty of formation collapse and fracture pressure; 3, calculating the drilling ECD of the horizontal section of the shale gas, and quantitatively representing the uncertainty of the drilling ECD of the horizontal section of the shale gas; 4, based on the quantitative representation of the formation collapse and fracture pressure uncertainty in the step 2 and the quantitative representation of the shale gas horizontal section drilling ECD uncertainty in the step 3, quantitatively evaluating the shale gas horizontal section well wall stability, namely, an analysis model for quantitatively evaluating the well wall stability is established. According to the method, the difficulty in identifying the borehole wall instability of the horizontal section of the deep shale gas is solved, the quantitative evaluation of the borehole wall stability is realized, the fault occurrence rate can be effectively reduced, the drilling efficiency is improved, the drilling period is shortened, and technical support is provided for reducing the cost and increasing the speed of shale gas drilling construction.

The invention discloses a multi-support cooperation method for controlling broken surrounding rock of a coal mine. In the support time, firstly, the surrounding rock is supported by a retractable canopy frame, then the broken surrounding rock part is subjected to grouting cementing, and finally, the broken surrounding rock and original complete surrounding rock are anchored and cemented through extensible anchor rods; in the support space, the retractable canopy frame supports and limits initial deformation of the surface of the surrounding rock, meanwhile, the surface of the surrounding rockis protected by a leakage-preventing flexible layer, leakage of grouting slurry is prevented, the broken surrounding rock at the shallow part is subjected to grouting cementing, then the extensible anchor rods are adopted to go deep to enable the cemented broken surrounding rock at the shallow part and the original complete surrounding rock to be connected in an anchored mode; and in the support strength, the retractable canopy frame supports the gravity of the surrounding rock at the broken part, so that the breaking range is not quickly expanded, the overall structure of the cemented surrounding rock can be formed after grouting cementing of the broken surrounding rock, the gravity can be borne by the strength, the anchoring strength of the extensible anchor rods is determined accordingto the deformation rate of the surrounding rock, and the purpose of multi-support cooperative control over stable-state deformation of the surrounding rock is achieved.

The invention discloses a mineral searching calibration method and system for element geochemical data screening, and relates to the technical field of mineral products, and the method is characterized by comprising: dividing a target area into a plurality of terrain areas of different terrain types; sampling and collecting target object element measurement data in the terrain area; fitting the target object element measurement data to obtain fitting element distribution information in one-to-one correspondence with the topographic areas; carrying out extrapolation interpolation processing on the fitting element distribution information of the current terrain area to a preset range area of the adjacent terrain area to obtain extrapolation element distribution information; carrying out smoothing processing according to the distribution condition of the element distribution information of the two target objects at the corresponding contour line tracks in the adjacent topographic regions, and then constructing an element contour diagram of the target region; and dividing the element equivalent value into a determined mining area, a to-be-determined area and a determined non-mining area. According to the method and system, calibration information with small errors and high accuracy can be obtained, and data support is provided for further research on mineral distribution.

New methods for determining the volumetric composition and saturation of methane and NGLs (natural gas liquids: ethane, propane, butane, and pentane) in a petroleum reservoir combining NMR (nuclear magnetic resonance) logging and NMR core analysis and for determining the mean pore-size and tortuosity of the light hydrocarbon-filled porosity in a petroleum reservoir using NMR core analysis.

A method for acquiring and improving seismic data includes activating a first seismic source located below a geophysical surface at a first depth and a second seismic source located below the geophysical surface at a second depth, wherein the second depth is below the first depth, acquiring seismic data with a seismic receiver in conjunction with activating the first seismic source and the second seismic source, and aligning primary reflections within the seismic data to provide improved seismic data. The method may also include determining changes to the regions below the second depth by comparing improved seismic data corresponding to a first acquisition event with improved seismic data corresponding to a second acquisition event. A corresponding system is also disclosed herein.

The invention discloses an offshore oilfield micro-fracturing injection time calculation system and method, and the method comprises the steps: modeling: collecting modeling parameters, and building aseepage and rock mechanics mathematic model; a simulation injection step: simulating injection of the micro-fracturing fluid, setting N1 injection time periods, and generating N1 post-fracturing fracture networks; an example execution step: executing the prediction example to obtain the discount yield increase of the well group; and a selection step: judging whether well group discount yield increase is in a descending trend or not, and selecting an injection time period corresponding to the after-pressure fracture network in the descending trend at first as injection time. By simulating theinjection time periods with different lengths and monitoring the well group discount yield increase of a plurality of post-fracturing fracture nets in real time, the injection time period corresponding to the post-fracturing fracture net with the well group discount yield increase reaching the first descending trend is finally selected as the optimal injection time. The optimal injection time is obtained, so that the optimal fracture network form is obtained, and the injection capacity of a single well is improved as high as possible under the condition that later water channeling is not caused.

The invention provides an earth surface shallow geothermal energy collecting and utilizing device which comprises a geothermal energy pipe. A box body is arranged above the geothermal energy pipe, a power generation device is arranged below the box body, a conveying device is arranged in the geothermal energy pipe, a containing box is fixedly installed in the box body, the pushing device is arranged in the containing box, the heat conduction plate is arranged in the containing box, and the rectangular box is fixedly installed at the top of the box body. According to the earth surface shallow geothermal energy collection and utilization device, through cooperative use of the power generation device and the conveying device, collection of geothermal energy is facilitated, output of electric power can be reduced during collection, and reduction of collection cost is facilitated; and through cooperative use of the pushing device and a heat conducting plate, waste heat generated by hot water can be collected conveniently, secondary treatment of the waste heat can be facilitated, rising of the atmospheric temperature caused by heat emission can be reduced, and through cooperative use of a storage device and a control device, the waste heat can be used and collected conveniently.

The invention discloses a fractured-vuggy oil reservoir parameter quick diagnosis method, a processor, and a machine-readable storage medium. The method comprises the following steps: acquiring a first early approximate solution and a first analytical solution of an infinite flow conduction fracture model of a fractured-vuggy oil reservoir; constructing a first flow conductivity influence function according to the first early approximate solution; according to the first analytical solution and the first flow conductivity influence function, constructing a finite flow conduction fracture analytical solution model to obtain theoretical pressure data of the well bottom of a fractured well of the fractured-vuggy oil reservoir; obtaining actual pressure data of the well bottom of the fractured well of the fractured-vuggy oil reservoir; according to the actual pressure data and the theoretical pressure data, determining a solving value of a fractured-vuggy oil reservoir parameter. The method is simple and easy to understand, and easy to operate, so that the calculation time is greatly shortened, and the analysis efficiency of fractured-vuggy oil reservoir parameters is improved.

The invention relates to a method for updating the stratum seismic velocity. The method comprises steps that the seismic velocity of a drilled area is updated according to seismic time horizon interpretation result data and the real depth of each horizon, and an initial seismic velocity model of the drilled area is obtained; pre-stack depth migration is carried out by utilizing the initial seismicvelocity model of the target area to obtain a common imaging point gather of the target area; based on the common imaging point gather, reflection points with different depths on a channel corresponding to a well track of the undrilled area are selected; for each reflection point, imaging depths corresponding to different reflection angles and ray lengths of corresponding reflection rays in eachhorizon are respectively obtained, and the initial seismic velocity of the stratum of the corresponding undrilled area is updated to obtain the updated seismic velocity of the undrilled area. The method is advantaged in that the number of parameters of traditional seismic tomography can be greatly reduced, so speed modeling efficiency is improved, and a foundation is laid for correcting the geomechanical model of the stratum to be drilled in real time.

The invention provides an eLORAN signal period identification method and device based on sky wave reconstruction, and the method comprises the steps: firstly judging whether a sky wave signal exists in an input signal, making a decision according to the sky wave intensity and position estimation, if the sky wave exists and is within a strong sky wave threshold, carrying out the sky wave and ground wave separation according to the signal and sky and ground wave parameter estimation values, otherwise, carrying out period identification directly according to the signal and the ground wave parameter estimation value; in the sky wave and ground wave separation, performing second-order variable step size search on the input signals to obtain optimal sky wave signal parameter estimation, then reconstructing and removing sky waves, and outputting optimal pseudo-ground wave signals; carrying out period identification according to the ground wave position estimation; or re-estimating the position of the ground wave signal by using a frequency spectrum division technology, calculating the zero crossing point position of the third cycle by using the ground wave signal position estimation value, and correcting in the cycle to obtain an accurate standard zero crossing point position, thereby realizing cycle identification. According to the invention, the recognition accuracy can be improved under severe conditions.

The embodiment of the invention provides a rock reservoir space measuring method and device, and the method comprises the steps: carrying out preliminary penetration scanning of a target rock, and determining attribute characteristics and distribution characteristics of a filler in the target rock according to a preliminary penetration scanning result; determining at least one fine penetration scanning area and the area volume ratio of the fine penetration scanning area in the target rock according to the attribute characteristics and the distribution characteristics of the filler; performing fine penetration scanning on the fine penetration scanning area, and obtaining area pore feature information corresponding to the fine penetration scanning area according to a fine penetration scanning result; according to the area volume ratio and the area pore characteristic information, determining the overall pore characteristic information of the target rock; according to the method, the accurate pore structure characteristics of the target rock can be obtained, so that the accuracy of target rock reservoir space measurement is improved.