718 results about "Geophysical prospecting" patented technology

Methods are disclosed employing seismic waves having infrasonic frequencies in the range of about 0.1–20 Hz for generating electromagnetic waves of similar infrasonic frequency in hydrocarbon bearing subterranean formations located at depths up to about 5000 meters, said electromagnetic waves having sufficient voltage amplitudes for detection at the earth's surface. Also disclosed are seismic sources capable of generating infrasonic seismic waves of sufficient amplitude for generating electromagnetic waves in hydrocarbon bearing formations at depths up to 5000 meters, said electromagnetic waves having voltage amplitudes sufficient for detection at the earth's surface.

The invention discloses an advanced geological prediction method for underground engineering. With geology as pivot, the advanced geological prediction method for underground engineering comprises four stages of long-term advanced geological prediction, middle-term advanced geological prediction, short-term advanced geological prediction and impending advanced geological prediction. The advanced geological prediction method comprises the following steps of: (1) making advanced geological prediction tasks for underground engineering for the underground engineering clear; (2) collecting data; (3) carrying out field geological review; (4) perfecting the modification of a longitudinal section drawing of the underground engineering; and (5) adopting combined geological method, geophysical prospecting method and horizontal drilling method to obtain advanced geological prediction. The invention provides the advanced geological prediction method for underground engineering; with geology as pivot, comprehensive geological analysis is carried out in the whole process of advanced geological prediction for underground engineering and the long-term, middle-term, short-term and impending advanced geological predictions are closely combined together to implement combination of geological method, geophysical prospecting method and horizontal drilling method; the comprehensive application of the geophysical prospecting method is optimized; and the advanced geological prediction method for underground engineering, provided by the invention, has the advantages of improving the predication accuracy, reducing predication cost and obtaining wide application range, etc.

The invention belongs to petroleum geophysical prospecting, and relates to a method for defining effective thickness of a target reservoir bed under complex geological conditions, by which the reservoir thickness is confirmed by using seismic wave information (namely, characteristic points and amplitude information). The method comprises the following steps: selecting comprehensive seism and logging information of a target layer section in a studied work area; obtaining a stack profile section after conducting Hi-definition and high resolution process on seism data; then meticulously explaining the position of the layer; and finally performing thickness prediction on the target reservoir bed. By the adoption of the invention, the effective thickness of the target reservoir bed under complex geological conditions can be estimated; and the method is not only suitable for conditions of each thin layer, and but also suitable for conditions that thickness, net sand ratio, thickness of various single layers and distribution manner of an actual thin alternating layer are all intensely changed, is not limited by tuning thickness of the thin layer, and has stronger adaptability.

The invention relates to an unmanned aerial vehicle aerial magnetic field detecting system and method and belongs to the technical field of novel airborne geophysical prospecting instruments. The detecting system specifically comprises an onboard portion and a ground portion, the onboard portion comprises a host, a multi-way power supply module and a sensor system, the host is connected with a servo motor of an unmanned aerial vehicle, the host comprises a main control panel, an onboard remote control telemetering communication device, an automatic driving navigator and a data recording instrument, the ground portion is used for controlling over taking off and landing of the unmanned aerial vehicle, real-time monitoring of measuring states and manual intervention in emergencies, and the ground portion comprises a ground remote control telemetering communication device, a remote-control unit, a ground control computer and a processing module. The unmanned aerial vehicle aeromagnetic detecting system and method can be used for aspects of underground mineral resource prospection and military target detection and for prospecting or strategic resource exploring of future 'earth-observing engineering' and national key construction projects. According to the unmanned aerial vehicle aeromagnetic detecting system and method, the technical scheme of aeromagnetic detection is simple and easy to implement, low in costs and remarkable in social benefits and economic benefits.

The invention discloses a method for quantificationally predicting sandstone reservoir fluid saturation by combining a well and seism in geophysical prospecting for petroleum. The method comprises the following steps of: acquiring and processing seismic data and log data to obtain each parameter curve; respectively determining the relationships among the shale content, the porosity and an elastic parameter of the well; establishing prediction models of the shale content and the porosity; calculating a pore volume modulus and a dry rock volume modulus to establish a modulus prediction model; establishing an effective reservoir water saturation prediction model; performing prestack seismic inversion by utilizing prestack seismic trace gathers and the log data to obtain an inversion data volume of each elastic parameter; calculating the dry rock volume modulus to solve the pore volume modulus by the obtained elastic inversion volume; and solving the water saturation by using the pore volume modulus. In the method, prestack seismic data and the log data are fully utilized for quantificationally predicting reservoir saturation; and good geological effects on predicting oil and gas saturation are achieved.

The invention relates to an inversion method for a stratum elasticity constant parameter of pre-stack seismic data in geophysical prospecting for petroleum. The method comprises the following steps of: acquiring seismic data, and processing the pre-stack seismic data; obtaining logging data and extracting angle gather seismic data to form all stacked data; performing horizon calibration on the seismic data and the logging data; inverting the seismic data which is stacked at different incident angles to obtain a wave impedance parameter; calculating a corresponding reflection coefficient; generating a logging and seismic data pair; calculating a weight function and a model parameter of a function mapping network model, an impedance parameter and an elasticity constant; and drawing an elasticity constant profile for reservoir lithologic identification, petroleum-gas prediction, oil-water interface determination and petroleum reservoir description. By the method, the elasticity constant can be calculated by the conventional inversion of the seismic data and the logging data; and the method has certain adaptability to the inversion of faults and pinch-out zones, a wide application range, high resolution, high calculation speed, high stability, high calculation accuracy and the characteristic of certain anti-noise property.

Provided are a tunnel geology comprehensive advanced forecasting expert system and an implementation method thereof. The system comprises a tunnel geology comprehensive advanced forecasting expert main module, a tunnel hole inner geology survey device, a tunnel hole inner geophysical prospecting device and an advanced horizontal drilling device. The tunnel geology comprehensive advanced forecasting expert main module is connected with the tunnel hole inner geology survey device, the tunnel hole inner geophysical prospecting device and the advanced horizontal drilling device respectively through data reading and outputting interfaces. The tunnel geology comprehensive advanced forecasting expert main module comprises a tunnel geology macroscopic forecasting sub-module, a tunnel hole inner geology survey analysis sub-module, a geophysical prospecting method selecting and detecting result analysis sub-module, a tunnel face front unfavorable geology forecasting sub-module, an advanced horizontal drilling and result analysis sub-module and a generating processing measurement sub-module. According to the system and method, a tunnel geology advanced forecasting worker can be helped to carry out tunnel geology forecasting working, and accuracy of forecasting is not lowered.

The invention provides a geophysical prospecting technical method for recognizing the lithology of petrosilex by using the combined characteristics of gravity-magnetic-electronic anomaly, which comprises the following steps of collecting and recording the physical characteristics of drill core; carrying out cluster analysis on the density, magnetic susceptibility and resistivity of rock by using k-means clustering and obtaining the clustering code of the drill core; carrying out gravity and magnetic anomaly stripping to the gravity and magnetic prospecting result for obtaining the anomaly and adopting the same clustering to conduct three-dimensional anomaly coding; and combining the clustering code of the physical characteristics of rock with gravity-magnetic-electronic anomaly code for reflecting the lithology of each petrosilex in an exploratory area. By developing the method for recognizing the lithology of petrosilex by using integral gravity-magnetic-electronic from qualitative speculation to quantitative statistics, the invention reduces human subjective factors from experience, avoids the situation that different geological interpreters obtain different results and improves the recognition effect of petrosilex.

The invention provides a denoising method for increasing the signal to noise ratio of seismic data, and belongs to the field of geophysical prospecting for petroleum. The data partitioning technique and the wave field separation technique are combined to suppress stochastic noise so as to increase the signal to noise ratio of seismic data. The method includes: partitioning the seismic data, subjecting each data block to complex field SVD (singular value decomposition) filtering, using the wave field separation technique for decomposition of characteristic values, using optimized characteristic values for data reconstruction, and replacing original frequency slices to realize suppression of the stochastic noise. Compared with the conventional SVD technique which assumes horizontal lineups, the method has the advantages that any relative time difference correction for the lineups is not needed, and denoising effects are stable. By means of the partitioning technique, unsteady state of inclination angle variation in actual seismic data can be overcome effectively, and time occupied by SVD and reconstruction is greatly shortened.

The invention pertains to the oil geophysical prospecting technique, relates to a method using the characteristic the amplitude changes with the vibration of the bias distance to improve the oil gas testing accuracy, which includes: 1, exciting and recording the earthquake wave process into a trace gather for AVO analyzing after time difference correcting; 2, executing an angular trace gather transformation to the input data; 3, obtaining two property section planes: delta(lambada/mu+2)/ (lambada/mu+2) and delta (mu* rho) /(mu* rho), taking the work area argillite wire trend, beta=0.86alpha-1172 as a restriction; 4, inversion after stack; 5, combining delta(lambada/mu+2)/ (lambada/mu+2) and delta (mu* rho) /(mu* rho) to execute analyzing of unconventionality boundary containing oil-gas. The inventive AVO analysis has the approximately same accuracy with Fatti, reduces indeterminacy in routine inversion method, improves the feasibility and reliability, and reduces the irregularity of the inversion matrix. The invention is very sensitive to the formation lithology and small opening fluid constituents, which is convenient for directly recognizing formation lithology variation and small opening fluid constituents.

The invention discloses a method for reinforcing a water-bearing stratum of a floor of a coal seam and protecting the water-bearing stratum during reinforcement, which comprises the following steps: 1) geophysical prospecting coalface by using transient electromagnetism, and exploring the position of the water-bearing stratum; 2) distributing reinforcement drill holes according to the geophysical prospecting result, wherein an angle alpha between the reinforcement drill holes and the horizontal plane is a high inclination-angle as possible; 3) slip-casting by using cement paste through the reinforcement drill holes; and 4) controlling the pressure of boreholes to less than twice that of L8 limestone hydraulic pressure. The method thoroughly avoids the passive situation that forced cessation of production of the coalface is caused by groundwater burst fatalness.

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.

The present invention belongs to the coal mining geophysical prospecting technical field, relates to a transient electromagnetic stack advanced detection device and method, in particular, a coal mine underground roadway transient electromagnetic stack advanced detection device and method. According to the device and method of the invention, a probe is arranged in a borehole, so that the probe can be far away from interference sources such as metal machineries in a roadway, and therefore, the influence of the interference sources can be avoided; the hole drilling conditions of a coal mine tunneling face are fully utilized, so that inside-roadway coil emission and inside-borehole three-component receiving can be realized; and a receiving device can move towards a direction before the tunneling face, and therefore, various kinds of the interference of the metal machineries at the tunneling face can be avoided without affecting the tunneling work of a mine party, and the advanced detection data of a plurality of positions in the borehole can be subjected to stack processing, and processing results can be displayed, and thus, hidden water damage geological bodies before the tunneling face can be predicted at an extra long distance.

The invention relates to a foundation processing method, in particular to a foundation integrated processing construction method of a cover type karst area. The method comprises the following steps of: evacuating earth moving machinery when a foundation pit is excavated until a limestone formation is exposed in a large area; basically exposing rocks of the bottom of the foundation pit after excavating, wherein rock buds are exposed from a foundation base, and the storage quantity of damic earth among the rock buds does not influence the next procedure construction; adopting weakened loose blasting operation, aiming at solution cracks, intermountain gulches and locally crushing bedrocks, and mechanically crushing and clearing; adopting a complex geophysical prospecting technological means that a high-density resistivity method is combined with a geological radar, arranging a high-density electrical geophysical prospecting wire in a construction site according to an arrangement rule, meanwhile, arranging a detailed exploratory hole in a building planning position, and mechanically picking the solution cracks, the intermountain gulches and the locally crushing bedrocks; adopting sleeve valve cement flour and coal ash slurry injecting constriction and cement flour and coal ash slurry filling constriction by a solution cavity slurry-injection method; and filling and casting concrete. The invention can quicken a work progress and can save construction cost compared with other foundation processing modes.

The invention relates to a method for improving the imaging quality of a vertical seismic profile in oil geophysical prospecting. The method comprises the following steps: picking up downlink longitudinal wave first-arrival time of different receiving points in zero-offset and nonzero-offset vertical seismic profile wave field data; establishing an aclinic initial interval speed model; pushing the first-arrival time of longitudinal wave outwards to a well side point to obtain a time field of downlink wave; seeking ray angles of downlink and uplink waves; forming a theoretical uplink wave field by utilizing the radial angle of the downlink wave and adopting a ray tracking method; obtaining a series of corresponding different interface dip angle values; and determining the maximal corresponding interface dip angle as the well side reflecting interface dip angle needing to be sought. The method can effectively reduce the influence of the estimated result of an overlying stratum on the reflecting interface dip angle and the influence of the estimated result of pickup error on the reflecting interface dip angle in the traveling of primary reflecting wave and improve the imaging quality by utilizing the vertical seismic profile.

The invention discloses an integrated information system for monitoring, early warning, management and control of mine water disasters. According to the integrated information system, data of a mine geophysical prospecting data acquisition subsystem, a chemical prospecting data acquisition subsystem and a water disaster prevention, treatment, monitoring and early warning subsystem are sent to a monitoring central server through a communication network. The mode that devices such as an existing geophysical prospecting system, an existing chemical prospecting system and an existing water disaster prevention, treatment, monitoring and early warning system operate singly and data cannot be shared is changed, each water disaster prevention and treatment device is used as a networked intelligent data terminal, data of the intelligent data terminals are acquired by monitoring servers arranged in a mine, a group company and a remote data center, powerful functions such as data real-time storage, dynamic analysis and intelligent judgment are provided for the mine, the Chinese integrated information system for prevention, treatment, management and control of water disasters is established, automatic, networked, intelligent and systematized operation of key mine water control devices used for detection, discharge, drainage and the like is achieved, professional, process and automatic water control and management are achieved, and scientification of decision-making is achieved.

The invention relates to an electromagnetic prospecting sending-receiving integration method and a device. The invention is suitable for the fields of geophysical prospecting, engineering geological prospecting, underground military target detection, nondestructive inspection and the like. The technical scheme of the invention is as follows: arranging an inner receiving coil 1 in a sending coil 3; arranging an outer receiving coil 2 outside the sending coil 3; ensuring that magnetic flux passing through the inner receiving coil 1 and the outer receiving coil 2 is equivalent and is in opposite sign under the action of primary field; mutually offsetting primary field induced voltage; and only outputting a secondary field signal. The device comprises a transmitter 4, a sending coil 3, an inner receiving coil 1, an outer receiving coil 2, a signal conditioning circuit 5 and a receiver 6, wherein the inner receiving coil 1 is connected with the outer receiving coil 2, and the coil 1 and the coil 2 are connected with the signal conditioning circuit 5. The invention has the advantages of eliminating primary field influence, reducing signal dynamic range, expanding the practicability of small-wireframe same-point device and realizing integration of the sending coil and the receiving coil.

The invention relates to a monitoring technic of stratum motions before and after the coal bed mining, particularly relates to a 1:1 in-situ monitoring method of the large space range overlying rocks before and after the coal bed mining, and is specifically an in-situ monitoring method of the large space motions of the coal mine mining stratum. The problem that monitoring means for rock strata movements do not yet exist at present for large space ranges either within the nation or outside the nation is solved. The in-situ monitoring method comprehensively adopts a means based on the 'one form three places' method of the subsidence-overburden rock migration-underground mine pressure, and the in-situ monitoring method further adopts the geophysical prospecting methods of well upper and lower linkage observation, the drill hole television observation, the hole gap CT observation and the micro-seismic monitoring and the like, and the in-situ monitoring method also adopts the integration monitoring methods of the working face surrounding rock stress-strain monitoring and the like. The in-situ monitoring method creatively integrates various observation means, and through the reasonable arrangements, designs, observations and analyses of various monitoring means in large space ranges, mutual complements, comparisons and verifications between the various observation means are achieved, meanwhile each separate monitoring technic is innovated and promoted, and the in-situ precise measurement of the large space motions of the coal mine mining stratum is achieved.

The invention discloses a method applied to the fine detection of a sudden water burst channel in underground engineering and evaluation of grouting and plugging effects of the sudden water burst channel. The method comprises the following steps: carrying out complex geophysical prospecting general survey and primarily determining the occurrence range, the scale and the general boundary of the space of the sudden water burst channel; carrying out fine detection of a cross-hole geological radar; implementing cross-hole CT fine detection of a three-dimensional resistivity; and tracking, monitoring and evaluating the whole process of grouting and plugging by virtue of a time-lapse-inversion-based full-space three-dimensional resistivity cross-hole CT method. The method has the advantages that results of complex geophysical prospecting general survey and cross-hole radar detection are mapped to a structural reference model, the three-dimensional resistivity cross-hole CT inversion is taken as a carrier, and the location accuracy of the sudden water burst channel and interface resolution effect are obviously improved; the time-lapse-inversion-based full-space three-dimensional resistivity cross-hole CT detection method is used for monitoring the whole process of grouting and plugging; the beneficial reference is provided for finding and plugging loopholes in time and further guiding the grout replenishing operation.

The invention relates to a petroleum geophysical prospecting technology, in particular to a noise suppression evaluation method for a three-dimensional observation system in seismic data acquisition. The method comprises the following steps: various three-dimensional seismic exploration and observation system proposals are designed, the CMP attribute information is calculated, the residual moveout between the significant wave and the noise is calculated, and the amplitude stacking characteristic of the noise is calculated according to the residual moveout; the comprehensive amplitude suppression characteristic and the fractional-frequency amplitude suppression characteristic of the noise of each common midpoint are calculated to obtain the statistical characteristic of a frequency chart; and the seismic data is acquired by using the three-dimensional observation system with the minimum value of the amplitude suppression characteristic to obtain a seismic section with high signal-to-noise ratio. The invention achieves the purposes of effectively suppressing the noise, improving the signal-to-noise ratio, improving the data acquisition quality of the three-dimensional observation system and obtaining the seismic section with higher signal-to-noise ratio, thereby enhancing the accuracy of drilling.

The invention discloses a method for detecting a shear-wave splitting fracture in geophysical prospecting operation for petroleum. The method comprises the following steps of: acquiring azimuth angle gather data volumes; determining fracture development situation, and overlapping azimuth angle gather data at different angles to form a plurality of overlapped data volumes; determining an overlapped data volume as a reference azimuth data volume according to unknown work area construction and fracture characteristics; performing time difference operation on the reference azimuth data volume and other overlapped data volumes, and thus obtaining the time difference of an event; and calculating and defining other azimuth angles, extracting time difference gather data volumes, determining maximum time difference, and detecting fracture development azimuth and density. A shear-wave splitting prediction fracture theory is applied to practice, a method for quantitatively describing a fracture type reservoir is provided, and the prediction accuracy of the fracture type reservoir is improved.

The invention discloses a deep gold mine stepwise prospecting method. The method includes the steps of (1) selecting a favorable metallogenic region; (2) arranging geophysical exploration lines in a certain distance in the selected region, and performing high-accuracy geophysical exploration to obtain exploration data of each exploration point; (3) performing geophysical data processing to form a contour map; (4) building a deep gold mine geological-geophysical prospecting model; (5) determining an ore-controlling fault deep dip angle stepwise change position in accordance with a deep gold mine stepwise metallogenic mode and the geological-geophysical prospecting model to delineate the position, shape and size of a deep gold mine.

The invention provides a method for modeling a reflection coefficient of a spherical PP wave in a viscoelastic medium and belongs to the field of geophysical prospecting for petroleum. The method comprises steps as follows: (1) a longitudinal wave phase velocity vp and a quality factor Q<-1> are calculated on the basis of a White model: the longitudinal wave phase velocity vp and the quality factor Q<-1> are calculated on the basis of the White model and reservoir parameters; (2) a reflection coefficient of a planar PP wave in a dispersive porous medium is calculated: the longitudinal wave phase velocity vp and the quality factor Q<-1> which are obtained in Step (1) are introduced in a Zoeppritz equation of the dispersive medium, and the reflection coefficient R<*>PP of the planar PP wave in the dispersive porous medium is calculated; (3) the reflection coefficient of the spherical wave is calculated: after the reflection coefficient R<*>PP of the planar PP wave is calculated in Step (2), the reflection coefficient of the spherical PP wave in the dispersive porous medium is modeled with a planar wave decomposition algorithm of the spherical wave, and the reflection coefficient R<spherical>PP of the spherical PP wave in the dispersive porous medium is calculated.

The invention relates to a geophysical prospecting method which is a high-precision refraction static correction data inversion method. The method comprises the steps: the production shot first arrival data of an earthquake work area are collected; the refraction wave delay time is calculated out through the following steps; and the data of micro logging control points and the information of refraction delay time are used for obtaining the time-depth curve of the low deceleration layer of the work area. Micro logging control points provide a target layer depth (HD), a refraction result offered delay time tD, a comprehensive tD(HD) curve and a conversion tD curve, thereby obtaining a reliable surface structure model and a high-precision low deceleration zone static correction result profile map. The invention has the advantages that the depth curve constrains and inverses the delay time when the high-precision low deceleration layer is used; the depth errors caused by the inaccurate velocity are eliminated; the application condition is wide; the adaptability is strong; and the result precision is finally improved.