254results about How to "Improve exploration efficiency" patented technology

The invention provides a method and a device for recovering an oil and gas reservoir rock mechanics underground in-situ model. The method comprises the following steps of: measuring rock mechanics parameters of an oil and gas reservoir; counting rock mechanics property influence parameters of the oil and gas reservoir; calculating the anisotropy strength of the rock mechanics parameters; obtaining a correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir; obtaining a correlation between the rock mechanics property influence parameters and the anisotropy strength; and recovering the oil and gas reservoir rock mechanics underground in-situ model by adopting the rock mechanics parameters, the anisotropy strength of the rock mechanics parameters, the correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir and the correlation of the rock mechanics property influence parameters and the anisotropy strength. By the method, the effectiveness and the accuracy for recovering the oil and gas reservoir rock mechanics underground in-situ model can be improved.

The invention relates to a risk-constrained oil and gas resource spatial distribution forecasting method which comprises the following steps of: (1) integrating seismic information and geologic information; (2) forecasting the exploration risk probability of a entire region; (3) establishing a resource abundance diagram of the discovered oil and gas accumulation; (4) establishing a resource abundance amplitude diagram and a resource abundance phase diagram; (5) establishing a modified resource abundance amplitude diagram; (6) establishing a risk probability amplitude diagram and a risk probability phase diagram; (7) establishing a forecast oil and gas resource abundance distribution diagram of the entire region; and (8) calculating the resource quantities of different risk regions: excluding the oil and gas accumulation with low abundance; excluding grid data points with high exploration risk; and verifying and modifying according to the data of the explored wells. The method can forecast the resource quantities in different risk regions and the spatial distribution positions of the remained oil and gas resources. A forecasting model and the method have strong operability. The invention can enhance the drilling decision level and the oil and gas exploration efficiency.

The invention discloses a joint inversion method for aviation transient electromagnetic data and aviation magnetotelluric data, and belongs to the technical field of geophysical exploration. The jointinversion method comprises the following steps of step a, performing two-dimensional inversion processing on the aeromagnetotelluric data by adopting a nonlinear conjugate gradient inversion method;step b, taking a reciprocal of the resistivity to convert the reciprocal into the conductivity, and meshing to form regular conductivity grid data; step c, constructing a reference model for the one-dimensional inversion of the aviation transient electromagnetic data; step d, obtaining the apparent conductivity and the apparent depth of an underground medium; step e, constructing an initial modelfor the one-dimensional inversion of the aviation transient electromagnetic data; step f, restraining and completing the one-dimensional combined regularization constrained inversion of the aviation transient electromagnetic data; and step g, outputting an inversion result of an aviation transient electromagnetic and aerospace magnetotelluric joint interpretation. According to the joint inversionmethod for the aviation transient electromagnetic data and the aviation magnetotelluric data provided by the invention, an inversion interpretation result with higher precision can be provided for theaviation geophysical exploration in large-area regions, so that the comprehensive exploration efficiency is improved.

The invention discloses a device for collecting bottom sediments and submarine water simultaneously. The device comprises a sampling tube, a piston, a balance weight, a water collecting box and a balance wing; a plastic sleeve is arranged in the sampling tube and used for storing bottom sediment samples; the piston arranged in the plastic sleeve is connected with a cable, and extends out of the top of the sampling tube, and is driven to move upwards by pulling the cable, so that the bottom sediment samples are pulled into the plastic sleeve; an automatic opening assembly is arranged at the bottom of the water collecting box and is opened under pressure of seawater when the device sinks in the sea and is inserted into the bottom sediments so that the submarine water is sampled into the water collecting box; the automatic opening assembly is closed when the sampling device floats so that the submarine water sample is sealed. The device has both functions of collecting bottom sediments and submarine water and can collect the submarine water sample at the position 1-2m away from the seabed.

The invention provides a boundary exploration autonomous mapping method based on curve fitting and target point neighborhood planning. For boundaries of an established map, target observation regionsare screened in a curve fitting mode. For a robot unreachable target observation region, a new target observation point is established through adoption of a neighborhood planning method, a robot is autonomously navigated to a next observation region through utilization of synchronous positioning and mapping technologies, and autonomous exploration for an unknown environment is finished. Accordingto the boundary exploration autonomous mapping method based on curve fitting and target point neighborhood planning provided by the invention, autonomous exploration mapping for an unknown indoor complex scene is finished with relatively few exploration times, relatively high exploration efficiency and relatively less exploration time, autonomy and intelligence of finishing mapping by the robot are improved, search mapping can be finished without manual intervention, and manpower and material costs are reduced.

Disclosed is a method for using a fracture density curve to forecast a fracture density body. The method for using the fracture density curve to forecast the fracture density body includes following steps: (1) preparing geology, well logging and earthquake data, performing normalization processing, inversion and attribute data body optimization on the related data, and obtaining the fracture density curve and an optimized data body of all wells after being normalized; (2) building various fracture density calculation models, bringing data on the fracture density curve of all the well after being normalized and curve data of the optimized data body into calculation, and selecting the fracture density calculation model most approximate to an actual fracture density situation according to calculation results; (3) bringing the optimized data body into the selected fracture density calculation model for calculating so as to obtain fracture density bodies after being normalized, and then obtaining the fracture density body of a time domain through reverse normalization processing. The method for using the fracture density curve to forecast the fracture density body can complete detailed description for the fracture density data body of the time domain, and then reduces well drilling risk, and improves shale gas exploration benefit.

The invention relates to a model-free depth-enhanced learning exploration method and a device. The method comprises the following steps of acquiring a characteristic value according to a sample; inputting the characteristic value into a depth-enhanced learning model and processing the characteristic value to obtain an action value; inputting the characteristic value into a counting model to obtainan action counting value; and determining a decision action according to the action value and the action counting value. The actions of different execution times are selected, and the environment return value of each action can be obtained more comprehensively in the exploration process of the depth-enhanced learning. The exploration efficiency is improved.

The invention provides a multi-frequency resistivity exploration method. The method comprises the steps of 1) transmitting current signals with different frequencies through n grounded power supply electrodes and an infinity power supply electrode by adopting an electrical transmitter capable of transmitting n mutually independent current signals with different frequency values; 2) acquiring n electric field total signals with different frequencies between two grounded measurement electrodes through an electrical receiver in a target area to be measured, separating the electric field total signals with different frequencies to obtain potential different data of n frequencies; 3) acquiring three-dimensional coordinates of the positions of the power supply electrodes and the measurement electrodes; 4) performing conversion between the potential difference data of the different frequencies and apparent resistivity data based on an apparent resistivity algorithm of electrical exploration;6) performing inversion processing on all of the apparent resistivity data to obtain real resistivity distribution characteristics of the target area to be measured; and 7) analyzing geological characteristics of the target area to be measured based on the real resistivity distribution characteristics. The method is conducive to significantly improving the field work efficiency and the explorationeffect of electrical exploration and reducing the cost of electrical exploration.

The invention provides a robot grid sub-map fusion method based on immune adaptive genetic algorithm. A matrix corresponding to two grid sub-maps is regarded as an antigen. An antibody is plane transformation made by a second grid sub-map. An antibody colony generates a next antibody in operations of copying, crossing and mutation operator basing on affinity degree of the antigen and the antibody. A selection probability calculated according to similar vector distance guarantees multiformity of the antibody. On the base of an immune principle, a crossover probability and a mutation probability are adaptively adjusted according to sufficiency of the antibody to reduce a probability of local optimum. The invention has a high searching efficiency and can effectively search the best plane transformation randomly distributed in a searching space. The invention is especially fit for a multiple mobile robot grid sub-map fusion problem in complex environment. And the invention can realize information sharing among robots as soon as possible and effectively realize coordinating exploration among robots, and improve exploration efficiency.

The invention is a method of quantitative evaluation on oil and gas accumulation conditions based on seismic data. According to the evaluation method, a mathematical model between seismic parameters such as seismic interval velocity and sandstone lens body reflection amplitude and hydrocarbon source rock residual pressure and equivalent hydrocarbon expulsion pressure is determined, the seismic interval velocity is acquired through seismic data correcting, and the hydrocarbon source rock residual pressure of a sandstone lens body is acquired according to the seismic interval velocity. Further, the sand body porosity is acquired according to the true thickness of the sandstone lens body, the equivalent hydrocarbon expulsion pressure is acquired according to the sand body porosity, and the oil and gas accumulation index of the sandstone lens body is acquired according to the hydrocarbon source rock residual pressure and the equivalent hydrocarbon expulsion pressure, thus completing quantitative evaluation on oil and gas accumulation conditions of the sandstone lens body. Quantitative evaluation on accumulation conditions of the sandstone lens body is realized with the use of the seismic parameters under the condition of lack of drilling and logging data, and the efficiency of exploration is improved.

The invention provides a reservoir prediction method and a reservoir prediction device. The reservoir prediction method comprises the steps of: acquiring three first attribute data volumes of a sampling point relevant to a reservoir, and performing normalization calculation on the three first attribute data volumes respectively to obtain three second attribute data volumes; determining reservoir threshold value ranges by utilizing the three second attribute data volumes respectively to obtain three threshold value ranges; performing data reconstruction by utilizing the three threshold value ranges to obtain three reconstructed data volumes; performing color fusion processing on the three reconstructed data volumes to obtain a color fusion data volume; and predicting reservoir types according to the color fusion data volume. The reservoir prediction method and the reservoir prediction device can achieve prediction of various kinds of reservoir types, and make the distribution condition of different reservoir types more convenient and intuitive by separating reservoir of different types through different colors, thereby increasing the efficiency of oil and gas exploration.

The invention provides a tight sandstone gas reservoir forming probability determination method and device. The method comprises the steps of: according to sedimentary facies distribution data of a to-be-measured reservoir, determining a first reservoir forming probability; based on the relation between the porosity critical value and the depth in conversion of a gas layer to a dry layer in the to-be-measured reservoir, determining a second reservoir forming probability; determining a third reservoir forming probability by using the vertical distance between the to-be-measured reservoir and source rock; based on the distribution of cap rock in the to-be-measured reservoir, determining a fourth reservoir forming probability; calculating a reservoir forming probability of the to-be-measured reservoir according to the first reservoir forming probability, the second reservoir forming probability, the third reservoir forming probability and the fourth reservoir forming probability. In the embodiments, sedimentary facies, interfacial potential, source rock and cap rock are important geological factors controlling distribution and development of tight sandstone gas reservoir, so that the reservoir forming probability of the to-be-measured reservoir can be comprehensively calculated according to the reservoir forming probabilities under the four conditions; the new method is provided for quantitative prediction of a tight sandstone gas reservoir forming probability under complicated development conditions, and the exploration efficiency is increased.

The invention discloses an intelligent digital geophone, a system, and a method. The geophone comprises a data acquisition unit and a power supply unit used for supplying the data acquisition unit with power. The data acquisition unit is detachably connected with the power supply unit. The data acquisition unit comprises a first housing and a first installation plate, which are used to form a closed first accommodation space. A seismic sensor, a controller, and a memory are disposed in the first accommodation space. The seismic sensor is connected with the controller, and the controller is connected with the memory. The power supply unit comprises a housing, a power supply, and a power supply management device. The power supply and the power supply management device are disposed in the housing, and the power supply is electrically connected with the power supply management device. The intelligent digital geophone is used to solve the technical problem of the conventional intelligent digital geophone of bad influence on construction caused by inconvenient carrying during an on-site operation process.

The invention discloses an airtight coring tool comprising an outer cylinder, an inner cylinder, a sealed device, a core catcher assembly and a core drilling bit; the inner cylinder is sleeved by theouter cylinder; a bottom end of the inner cylinder is connected with the core catcher assembly in a screwed mode; a bottom of the outer cylinder is connected with the core drilling bit in a screwed mode; the sealed device comprises a body and a first sealing ring; a top end of the body is installed inside the inner cylinder; the bottom end is positioned outside the core drilling bit; the first sealing ring is installed on the body; the body is sealingly connected with an inner wall of the core catcher assembly through the first sealing ring. When the airtight coring tool is used, coring sealing liquid is poured into the inner cylinder, the coring tool is connected to the drilling tool, and the coring tool is drilled downward to recycle drilling fluid and coring tools are released; when the sealing device fails, tree core parameters and coring drilling parameters are set. After the coring stage is completed, the core is cut and the drill is recovered. The airtight coring tool of the present invention can more accurately and comprehensively understand the formation lithology, and increase the credibility of the core analysis and prospecting well reserve prediction.

The invention provides a method for predicting gas content of shale by using seismic data and belongs to the petroleum and natural gas exploration field. The method includes the following steps that: (1) geological, logging and seismic data are prepared; (2) a density logging curve-based gas content calculation model, that is VGAS=f(DEN) (1), is established through using high correlation between a density logging curve and shale gas content data, wherein VGAS is gas content, m<3> / t, DEN is a density logging curve, g / cm<3>, and f is a function relational expression between gas content and density; (3) post stack multi-attribute inversion is carried out, so that density curve data required by the gas content calculation model can be obtained; and (4) gas content prediction is carried out: the density curve data obtained in the step (3) are introduced into the formula (1), so that the gas content of the shale can be obtained.

The invention discloses a method and apparatus for determining a path of mobile electronic equipment. The method comprises: a map of a first detection area is established; a first path is determined in the map, wherein the starting point of the first path is location of mobile electronic equipment and the end point of the first path is located at the boundary of the first detection area or the location of a first obstacle in the first detection area; and when the mobile electronic equipment moves along the first path and meets the first obstacle, a second path is determined by using the location of the first obstacle as a starting point and an end point of the second path is located at the boundary of a second detection area or location of any obstacle except the first obstacle in the second detection area, wherein the second detection area is an area that is detected by the mobile electronic equipment when moving along the first path from the starting point of the first path to the location of the first obstacle. With the method and apparatus, a technical problem that the exploration efficiency of an unknown area is low when the mobile electronic equipment determines a path according to the correlated technologies can be solved.

The invention provides a quantitative forecasting method and device for oil-gas possibility of reservoirs. The method comprises the following steps: obtaining post-stack seismic data on the oil-gas reservoirs; estimating seismic wavelets based on the post-stack seismic data; performing frequency division processing on the post-stack seismic data based on the seismic wavelets; performing inversion on the post-stack seismic data subjected to frequency division processing, so as to obtain the seismic frequency variable attributes of the oil-gas reservoirs; performing forward modeling of the different oil-gas saturation degrees based on a rock physical model and rock physical parameters of a known well, so as to obtain the frequency variable attribute of the known well; based on the frequency variable attribute of the known well, building an intersection graph template between the frequency variable attributes of the different oil-gas saturation degrees and reflection coefficients; based on the graph template, obtaining the reservoir oil-gas saturation degrees corresponding to the seismic frequency variable attributes.

The invention discloses a high-performance small-waterline-area twin-body intelligent measurement ship. A ship body of the ship comprises a submerging body and a case. A power unit and a direction control unit are arranged on the submerging body, a remote control unit and a measuring unit are arranged on the case, and a solar cell panel is arranged on the upper surface of the casing. The submerging body is formed by two parallel and symmetric torpedo submersible diving chambers. Each submersible diving chamber comprises three watertight battery compartments. Storage batteries are arranged in the three battery compartments and are connected through wires. The storage batteries are connected with the solar cell panel, the power unit, the remote control unit and the measuring unit through wires respectively. By means of the measurement ship, new energy is fully used during measurement ship navigation and stored, and accordingly, the endurance of the ship and the intelligent equipment normal operation are guaranteed, and the survey is efficient, energy saving and environmentally friendly.

A road accident emergency command, rescue and investigation vehicle comprises a cab, an operating chamber and an equipment chamber. A lighting device and a snapshot device are arranged on a roof platform. The operating chamber is internally provided with a control wall. A lamp holder at the lower end of a lamp pole is connected with equipment fixing plates. The snapshot device is fixed on an arm of a roof lifting cranked-arm lamp and is composed of a metal halide lamp, a camera, a high-definition electronic snapshot camera, a speed measuring radar unit and a flashlight. A base of the roof lifting cranked-arm lamp is connected with the equipment fixing plates. The equipment fixing plates are all fixed on the roof platform through bolts. A guardrail is arranged on the periphery of the roof platform and is provided with a strobe light and a needle camera. The lighting device is connected with a touch screen arranged on the control wall. The needle camera and the snapshot device are connected with a vehicular television, a control panel, the touch screen and a public security network computer. Charging units are arranged at the tail of a vehicle body and in the equipment chamber. The road accident emergency command, rescue and investigation vehicle allows dead-angle-free rotational recording and allows real-time transmission, command and the like under remote control of a remote controller.

The invention discloses a method for prospecting a pegmatite rare metal. The method comprises the following steps of preliminarily identifying a pegmatite vein space distribution by use of high-precision remote sensing interpretation according to a regional geological background and a magmatic rock distribution region; performing geological survey by use of a large 1:10,000 scale; accurately plotting a pegmatite vein distribution law graph to preliminarily screen out a pegmatite vein distribution region; performing stream sediment measurement in a ratio of 1:25,000 and large-scale high-precision magnetic measurement, delineating a rare element stream sediment anomaly distribution diagram and a high-precision magnetic measurement anomaly diagram; deploying a lithogeochemical profile in a ratio of 1:5,000 in a key anomaly section for control tracing, preliminarily and optimally marking out a pegmatite-containing vein material; deploying an exploratory trench for disclosure control to mark out a mineralized body or an ore body; preferably optimally deploying a drilling hole for the pegmatite vein with high grade and large scale according to characteristics of the mineralized body or the ore body to perform deep verification, and specifically delineating the ore body.

The invention provides an unknown space autonomous exploration planning method, and the method comprises the steps: obtaining the current positioning information of a robot to generate a three-dimensional point cloud map, taking the robot as a center to generate a Voronoi diagram, and carrying out the sampling based on the path center of the Voronoi diagram to generate Voronoi-RRT; using an RRT algorithm to find feasible paths from all boundary points of the Voronoi-RRT tree by taking the position of the robot as a starting point, calculating the exploration gain of each path, and taking the maximum exploration gain as an optimal path; using a path planning algorithm to execute dynamic obstacle avoidance to generate a collision-free candidate path, and when the path is shielded by a dynamic obstacle, planning the path to continue to move on other candidate paths; and using a DWA dynamic window algorithm to track the final path, and obtaining and issuing a speed instruction to a robot control platform; and when the robot is dead or the electric quantity of the robot is insufficient, calling the global planner, and pulling to the previously marked exploration space boundary or returning to the starting point. And rapid, safe and efficient underground unknown space autonomous exploration is realized.

The invention provides a fracture identification method and a fracture identification device of seismic data, wherein the fracture identification method comprises the steps of acquiring the seismic data of a work area; after grouping azimuths of the work area, stacking the seismic data of the azimuths in each group, thereby obtaining a plurality of groups of stacked seismic data; after compressing the fracture identification attribute of each group of stacked seismic data, fusing the plurality of obtained fracture identification attributes, thereby obtaining the fracture identification attribute of the seismic data; and performing fracture identification on the work area according to the result. According to the fracture identification method and the fracture identification device, through compressing the fracture identification attributes of the seismic data in different types, generality of each attribute to fracture identification is kept; abnormity information in various facture identification attributes is eliminated; and seismic attribute signal-to-noise ratio is greatly improved. By means of fusion technology, fracture information of different azimuths are fused, thereby protruding fracture identification difference of each azimuth, improving fracture identification precision and identification capability and finally improving oil-gas exploration efficiency.

The invention discloses a method for exploring lead zinc ore in a sedimentary rock host. The method has the advantages that exploration efficiency is high, and the exploration period is short. The method comprises the following steps that firstly, according to the geographical environment and spatial-temporal characteristics, whether a metallogenic system is a sedimentary rock host Pb-Zn-Cu multi-metal metallogenic subsystem is analyzed and judged; secondly, according to the characteristics of the sedimentary rock host Pb-Zn-Cu multi-metal metallogenic subsystem, distribution of points, collection of relevant samples and analytical research are conducted; thirdly, the clue of the lead zinc ore is determined according to a sample collection result and an analysis result in the second step; fourthly, a mineral geological survey is conducted; lastly, a trial trench is constructed and a well is drilled for further sampling analysis, and a mineralized zone or an ore body is delineated. The method for exploring the lead zinc ore in the sedimentary rock host has the advantages that the exploration efficiency is high, and the exploration period is short through implementation of the steps.

The invention belongs to the field of mineral exploration, and aims at solving the problems that the physical heterogeneity of sand bodies in sandstone-type uranium ore stratums in a research area ishigh, and conventional hole-permeability fitting formula accounts for low permeability. The method for calculating the permeability of the sandstone-type uranium ore sand body based on the flow unit classification is provided, and the stratum permeability explanation precision is improved. The method comprises the following steps: 1, calculating a flow unit index of a sample point according to actually measured physical property data of a core of a coring well section; Step 2, realizing reservoir classification by applying a probability graph method; Step 3, establishing a quantitative relation between the flow unit index and the logging response based on five logging curve data of quantitative gamma, natural gamma, density, apparent resistivity and sonic time difference; Step 4, on the basis of flow unit index classification, respectively establishing holes according to different types of reservoirs; a seepage relational expression; Step 5, performing reservoir classification; 6, obtaining a stratum interpretation permeability value; and step 7, drawing a permeability spatial distribution diagram, and establishing an ore searching model.

The invention provides a multi-electrode system detection method for finding an inter-well target body. The method comprises the following steps of (1) arranging a pair of power supply electrodes in two drilling holes for power supply based on the two drilling holes of an exploration area, acquiring potential signals of a plurality of pairs of measuring electrodes by virtue of a multichannel electrical prospecting and receiving system, and converting the collected potential signals into apparent resistivity and apparent polarizability parameters; and (2) performing inter-well two-dimensional combined inversion imaging on the apparent resistivity and apparent polarizability data, and comprehensively utilizing an inversion imaging result of the resistivity and the polarizability to analyze spatial distribution morphology of the target body in order to achieve a purpose of finding the inter-well target body. The method can overcome the defect that the observation information amount of a conventional inter-well induced polarization method is small, the multiplicity of single parameter inversion can also be reduced through the combined inversion imaging of the inter-well resistivity andthe polarizability, and the detection effect of the inter-well induced polarization method can be improved.

The invention provides a reverse circulation drill for geological prospecting, and a power head of the reverse circulation drill. The reverse circulation drill for geological prospecting is high in drilling efficiency. The power head comprises a rotating joint, a rotary box and a gas distributor, wherein the rotating joint, the rotary box and the gas distributor respectively comprise a rotating shaft, a main shaft and a mandrel which are hollow shafts arranged in a coaxial through way and are sequentially connected in a sealing way; the outer end of the rotating shaft is provided with a slag discharge hole; the main shaft is connected with a driving motor; the mandrel is internally provided with an inner tube in a coaxial way; the inner end of the inner tube is connected with the inner wall of the mandrel in a sealing way; the inner end of the inner tube is communicated with a hollow part of the main shaft is through; the outer diameter of the inner tube is smaller than the inner diameter of the mandrel; and at least one air inlet is arranged along the circumferential direction of the inner end of the mandrel, and compressed air enters the mandrel from through the air inlet. All the parts of the power head are independent of one another, so that the power head is convenient to assemble and disassemble; therefore, the sampling process is simplified, the quality of a sample is guaranteed, and the exploration efficiency is improved.

An asymmetric electrical method-based sounding method is disclosed. A series of equal interval power supply points that are symmetric about only one fixed point are designed, underground power supply can be realized via two power supply points symmetric about the fixed point through an electrical method exploration transmitter, the electrical method exploration transmitter is used for simultaneously receiving electric field signals of all measurement points on an exploration line, and apparent resistivity and induced polarization parameters of each measurement point are obtained when each pair of symmetric power supply points are used for power supply. Via the method disclosed in the invention, workloads of power supply point arrangement can be greatly reduced, a plurality of sounding points can be subjected to sounding operation via a multichannel electrical method instrument or a plurality of electrical method instruments, and exploration efficiency of a two dimensional or three dimensional electrical method can be improved. In a three dimensional asymmetric electrical method sounding mode, exploration efficiency and exploration effects can be improved due to adoption of the three dimensional electrical method sounding mode.

The invention provides a method and a device used for determining critical exhaust strength of tight sandstone gas reservoir exhaust source rocks. The method comprises steps that, stratum data of a target interval of a tight sandstone gas reservoir research zone is acquired, stratum hydrostatic pressure, gas water interface tension force under the stratum condition, natural gas compression factors and capillary force are determined according to the acquired stratum data, gas bulging force under the force balance condition is calculated, and the critical exhaust strength is calculated according to the stratum temperature, effective hydrocarbon source rock thickness, hydrocarbon source rock porosity and natural gas substance amount of the acquired stratum data, and the natural gas compression factors and natural gas density acquired through calculation. The method solves a technical problem of difficulty in quantitatively predicting the critical exhaust strength of the tight sandstone gas reservoir exhaust source rocks in an oil gas basin in the prior art, improves exploration efficiency of tight sandstone gas and reduces risks in exploring tight sandstone gas reservoirs.

The invention provides a method and equipment for building a two-dimensional near-surface geological model. The method comprises the steps: near-surface data, stratigraphic geological data and surface elevation data of a seismic exploration work area are measured; a geological model framework is built according to lateral range data of a two-dimensional measuring line in the near-surface data and depth data of an underground geological target in the stratigraphic geological data; an original geological model is formed according to a surface elevation curve in the surface elevation data and the geological model framework; near-surface structure data points in the near-surface data are distributed to the original geological model to obtain the two-dimensional near-surface geological model. The method and equipment eliminate the defect that in a geological model building technique in the prior art, only a geological model with a constant velocity in a geological model block can be built, and a complicated geological model with a changing velocity in the geological model block cannot be built, and can automatically convert the surface and near-surface data obtained directly from field measurement into the accurate two-dimensional near-surface geological model.

The invention relates to a sealing method for the vibrating source blast hole in seismic exploration, which is characterized by comprising the steps of: (1) preparing a seismic exploration sealing agent forming barrel; (2) arranging the sealing angle from the open end of an liner into the liner, compressing to a demanded charge density, arranging the liner with the sealing agent into the chamber of a plastic shell to form a section of seismic exploration sealing agent pole; (3) charging a seismic source agent package into the seismic source blast hole, connecting 2 to 6 of seismic exploration sealing agent poles to form a seismic exploration sealing agent pole group to be arranged into the seismic source blast hole to reach the bottom of the seismic source blast hole, wherein when charges the seismic exploration sealing agent pole groups into the seismic source blast hole, the water in the seismic source blast hole should submerge the seismic exploration sealing agent pole groups. The sealing method can resolve the technical problems such as the energy of the seismic source agent package is dispersed early and has large loss, to improve the exploration depth and accuracy of seismic exploration and reduce the effect of blasting on environment in seismic exploration.