13 results about "Seismic survey" patented technology

The application discloses a marine seismic survey line leveling method, a processing system and a storage medium, and comprises the following steps: acquiring a seismic operation survey line; extracting a seabed first arrival wave time value according to the seismic operation survey line; grouping the seismic operation survey line to obtain a main survey line group and a liaison survey line group; obtaining an intersection difference according to the seabed first arrival wave time value, the main survey line group and the liaison survey line group; calculating a difference adjustment value of the seismic operation survey line according to the intersection difference; and completing seismic survey line leveling according to the difference adjustment value. The application can quickly level the seismic survey line, reduce the closure error of the seismic survey line and improve the processing efficiency of the closure error of the seismic survey line by grouping the seismic operation survey line first, then calculating the intersection difference (i.e. the difference value of the seabed first arrival wave time value) of two groups of seismic operation survey lines in different directions, and finally calculating the corresponding difference adjustment value and adjusting all the seismic operation survey lines.

The application discloses a method and device for identifying gas-bearing reservoirs, and the method comprises the following steps: establishing a reservoir longitudinal identification criterion according to well logging data and seismic data of a study area; extracting a plurality of seismic attributes from each seismic survey line in two-dimensional seismic data of the study area; determining optimal seismic attributes from the plurality of seismic attributes through comparative analysis; and determining a favorable reservoir distribution area according to the reservoir longitudinal identification criterion and the optimal seismic attributes.

A system and method for designing a seismic survey including selecting a seismic survey grid as a basis for a seismic survey design and looping through the steps of generating off-the-grid locations by imposing spatial or temporal constraints on on-the-grid locations, mapping the off-the-grid locations from a physical domain to a pre-selected domain by applying a multidimensional transform to the off-the-grid locations, mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, and updating the seismic survey design based on which of the off-the-grid locations has the minimum rank until a pre-selected threshold is met indicating an optimal seismic survey design. The system and method include acquiring seismic data using the optimal seismic survey design, and enabling performing a wellsite action based at least on the seismic data.

A method for predicting a property of a subsurface formation, includes: drilling one or more wellbores into the subsurface formation at a well location; conducting a seismic survey at the well location to construct a primary seismic image volume, the primary seismic image volume dataset comprises at least a pressure wave velocity vp, a shear velocity vs, and a density rho, in both time and frequency domains; conducting well logging at the one or more wellbores to generate logging information at the well location; generating an auxiliary seismic image volume for seismic-guided property prediction using Kriging at the well location; generating a prediction operator based on the primary seismic image volume, the auxiliary seismic image volume and the well logging information; feeding a seismic image volume and the prediction operator into a property prediction engine; and generating the predicted property of the subsurface formation.

The application discloses a kind of optimal survey line planning method and device for seismic exploration based on ocean current prediction, method includes: obtaining the candidate survey line set in exploration area, obtain the ocean current prediction data in preset planning time window;Establish towed bird angle prediction model, according to ocean current prediction data, determine the expected feather angle and risk index of each candidate survey line in candidate survey line set at each time by using towed bird angle prediction model;According to the expected feather angle and risk index of each candidate survey line in candidate survey line set, screening is carried out according to the first preset constraint condition, determine the feasible time window set of each candidate survey line;According to the feasible time window set of each candidate survey line, the optimization result containing the execution order and time window of each candidate survey line is determined by using the second preset constraint condition and multi-objective cost function, and the survey line pushing instruction set of ship is generated according to the optimization result. The expected feather angle and risk index are actively predicted before operation using ocean current prediction data, and the operation safety is improved.

This application provides a method, apparatus, device, and computer-readable storage medium for determining the extension length of an observation line in seismic exploration. The method includes: acquiring layer information of a target layer; the layer information including depth, velocity, maximum dip angle, and the dominant frequency of the target layer's location; determining the offset aperture for the target layer to meet the first Fresnel zone requirement based on the velocity and the dominant frequency; determining the offset aperture for the target layer to meet the 30-degree diffraction repositioning requirement based on the depth; determining the offset aperture for the target layer to meet the stratigraphic dip angle requirement based on the depth and the maximum dip angle; and determining the extension length of the observation line based on each offset aperture. The observation line extension length determined by this method can meet the offset repositioning imaging requirements of all reflection points, improving the acquisition accuracy of the observation system.

A method can include receiving seismic survey data of a subsurface environment from a seismic survey that includes a source arrangement of sources that is spatially denser than a receiver arrangement of receivers; processing the seismic survey data using the principle of reciprocity for performing interpolation across the receivers to generate processed seismic survey data; and generating an image of at least a portion of the subsurface environment using the processed seismic survey data.

A method of processing seismic data by a reflection seismic survey includes: calculating a first pseudo-water-surface reflection wave by virtually propagating a direct wave represented in the seismic data in a progressing direction of a time axis by a time in which the acoustic wave propagates in the water at a distance twice a depth of the seismic source, and further correcting an amplitude of the direct wave so that the amplitude is approximated to an amplitude of a water-surface reflection wave of the acoustic wave represented is the seismic data; and subtracting a component corresponding to the first pseudo-water-surface reflection wave from the seismic data.

This invention discloses a three-dimensional modeling system and method for sparse two-dimensional seismic survey lines, belonging to the field of three-dimensional modeling technology. The method includes: collecting and preparing a geological planar base map, regional structural feature information, interpretation results of two-dimensional seismic survey lines, geological structural profile maps, surface geological boundary data, and single-well stratification data; supplementing geological structural profiles based on the existing seismic survey line distribution and regional structural trends to construct a high-density modeling profile framework; fusing fault line data in the profile framework to determine the spatial combination relationship of faults; fusing stratigraphic data based on seismic survey lines, geological structural profiles, surface geological boundaries, and single-well stratification data to generate planar structural maps of each key interface; and finally, using the structural framework modeling method in Petrel software, sequentially establishing fault models and three-dimensional stratigraphic models. This invention effectively solves the problem of being unable to conduct detailed three-dimensional modeling due to sparse seismic data during the geological survey stage and the early stages of exploration.

This invention provides a method and system for determining the station number of a seismic survey detour, and a readable storage medium. The method includes: generating receiving lines between adjacent receiver points based on digital elevation model data; inserting control points on each receiving line; calculating the coordinates of each control point and receiver point to calculate the slope length between all adjacent points, wherein adjacent points are two adjacent control points or an adjacent control point and receiver point; calculating the sum of the slope lengths between adjacent points on each receiving line to obtain the slope length between adjacent receiver points; and determining the station number of adjacent receiver points whose slope length is greater than the fixed length of the wired instrument's main line, denoted as the survey detour station number. This application determines the survey detour station number by inserting control points between adjacent receiver points and calculating the slope length between two receiver points using a summation method, facilitating the accurate allocation of seismic acquisition equipment for field operations based on the survey detour station number.

A sensor package may include a sensor housing unit and a first sensor that may acquire a first set of measurements within a first measurement range. The sensor package may also include a second sensor configured to acquire a second set of measurements within a second measurement range. The first measurement range and the second measurement range may include an overlapping range used to calibrate the first set of measurements, the second set of measurements, or both.

A method for source wavelet estimation for seismic surveys includes a number of steps. First, seismic data is acquired using seismic data recording sensors and well logging data is acquired using well logging tools in a well site within a survey area. The seismic data and well logging data are stored and processed in a computer system. The acquired and processed time-migrated seismic data is the observed data. The well logging data is processed to obtain one or more formation models representing one or more formation properties; reflectivity modeling is performed to obtain reflectivity, a bandpass filter, and time-migrated reflectivity to generate band-limited reflectivity; the band-limited reflectivity is cross-correlated with the observed data to obtain weights; and inversion is performed based on the weights, the reflectivity, and the observed data to obtain a source wavelet.

The present disclosure relates to a near-surface P-wave velocity modeling method and device based on microtremor exploration, the method comprising: obtaining a surface geological map of a target work area based on surface investigation, and correcting the geological boundary of the surface geological map based on surface investigation; according to the stratum, fault and stratum occurrence information provided by the corrected surface geological map, drawing a geological cross section along a seismic survey line to obtain a shallow surface structure model of the target work area; obtaining the shallow surface S-wave velocity of each preset survey point of the target work area, and converting the shallow surface S-wave velocity of each preset survey point into P-wave velocity; taking the shallow surface structure model as a constraint, and performing spatial interpolation on the P-wave velocity of each preset survey point to obtain a near-surface P-wave velocity model based on the shallow surface structure model; based on the shallow surface structure model, the shallow velocity field, the inverted velocity is close to the stratum velocity, the accuracy is higher, and a better near-surface P-wave velocity model is provided for subsequent prestack depth migration.