11 results about "Unconformity" patented technology

The present application provides a kind of buried hill unconformity on the recognition method of cutting type fault layer of intercept, the buried hill unconformity on the recognition method of cutting type fault layer of intercept includes: step 1, according to the well logging data of drilled well, carry out buried hill inside formation, fault interpretation;Step 2, carry out buried hill top unconformity seismic reflection characteristics forward modeling;Step 3, carry out the recognition of cutting type fault layer of intercept on the unconformity of pre-third system buried hill.The recognition method of cutting type fault layer of intercept on the buried hill unconformity effectively solves the recognition problem of cutting type fault layer of intercept on the buried hill unconformity, and has great significance for the oil and gas exploration work of pre-third system buried hill.

The invention belongs to the technical field of geophysical prospecting engineering, and particularly discloses a deposition unconformity high-precision identification method, device and equipment based on double standard layers and a medium. The method comprises the following steps: firstly, on the basis of well connection comparative analysis of a drilled area, finely synthesizing seismic record calibration, and establishing a corresponding relation between depth domain stratigraphic geologic features and time domain seismic response; thirdly, identifying and tracking the unconformity surface through a double-standard layer-by-layer leveling unconformity identification method, then optimizing an unconformity horizon result by applying a weighted average optimization method to form a final unconformity interpretation horizon, and finally further checking and optimizing to compile an unconformity structure map. According to the method, the phenomena of unconformity upper and lower strata seismic homonymous axis homonymous direction, sharp angle bending, strata thickness trend abnormity and the like caused by inaccurate unconformity identification can be eliminated, the unconformity identification precision is improved, and the method is suitable for research on basin oil and gas reservoir rules in geophysical exploration.

The invention relates to a karst ancient landform detail drawing compilation method and device, equipment, a storage medium and a computer program. The method comprises the following steps: determining ancient landform categories contained in a region according to a geological background; according to the unconformity development characteristics, the upper stratum thickness and the lower stratum thickness of the karst unconformity surface are determined, and the thickness ratio of the upper stratum to the lower stratum at all drilling positions in the area and the ancient landform type at each drilling position are determined; determining a thickness ratio interval corresponding to each ancient landform type according to a thickness ratio between the upper stratum and the lower stratum at all drilling positions; performing tracking interpretation on the karst unconformity surface according to the seismic data so as to determine a weathering crust of a seismic interpretation layer and a ratio distribution diagram between the upper stratum thickness and the lower stratum thickness of the weathering crust; and determining a karst ancient landform detail drawing according to the ratio distribution diagram of the calibrated drilling position and the thickness ratio interval. The ancient landform is finely depicted in a well-seismic combination mode, operation is convenient, and efficiency is high.

The invention relates to a tectonic evolution method and device for recovering denudation strata through trend-structure extrapolation of an extended fractured basin, and the method comprises the steps: collecting geology, earthquake and logging information of the extended fractured basin, and building a three-dimensional geologic model of the extended fractured basin; carrying out horizon interpretation on a two-dimensional earthquake and a three-dimensional earthquake in a research area through seismic event stratum tracking by combining seismic reflection characteristics and drilling data on the basis of a synthetic seismic record calibration stratum; carrying out unconformity interface and fracture interpretation on the stretching fault basin, establishing a construction model, dividing stratums corresponding to the unconformity interface of the stretching fault basin, and determining formation time, distribution and evolution of the stratums; establishing a typical structure style, and selecting a typical profile; the denudated syngenetic fault and / or boundary fault and the stratum are / is recovered; and extrapolating and recovering the denudation fault and the stratum through a trend-structure external technology, and recovering a structure evolution history diagram. According to the method, the denudated stratum can be reliably recovered.

The application provides a palaeogeomorphology recovery method and device, which comprises the following steps: constructing an initial palaeogeomorphology; determining a compaction coefficient based on porosity data and burial depth, and using the compaction coefficient to correct the residual thickness of the initial palaeogeomorphology to obtain a decompacted palaeothickness; determining an absolute palaeowater depth based on uranium element content, and subtracting the absolute palaeowater depth from the decompacted palaeothickness to obtain a palaeotopography of a sediment surface; identifying an unconformity surface, determining an uneroded area and an eroded area according to the unconformity surface, constructing a trend model using the stratigraphic thickness variation trend of the uneroded area, determining the eroded thickness of the eroded area based on the trend model, and obtaining a complete palaeogeomorphology after erosion recovery; taking a selected reference layer as a datum plane, reversely sliding an upper wall of a fault along a fault plane until the upper wall reference layer and a lower wall reference layer are spliced, performing trend interpolation filling on data gaps at the fault to obtain a target palaeogeomorphology after the influence of the fault is removed. The application improves the accuracy and objectivity of palaeogeomorphology recovery.

The invention discloses a stratigraphic position unconformity interpretation method, which relates to the technical field of geological detection, and comprises the following steps: constructing a geological data set and drawing a geological profile map, identifying a potential unconformity interface according to the geological profile map, screening out a plurality of sampling points of which the similarity between an upper rock stratum and a lower rock stratum at the unconformity interface is lower than expectation, constructing a distribution coefficient, and carrying out stratigraphic position unconformity interpretation. Positioning a risk area on the unconformity interface according to the distribution state of the plurality of distribution coefficients; training to obtain a regional structure evolution model, generating a relationship between geological structure activity and stratum unconformity by the regional structure evolution model, and outputting the relationship as a geological mapping relationship; a stratigraphic interpretation knowledge graph is constructed in advance, and an interpretation text is matched from the stratigraphic interpretation knowledge graph according to the correspondence between the unconformity geological mapping relation of the stratigraphic and the interpretation content. Under the assistance of the knowledge graph, the time consumed by comprehensive interpretation can be saved, and the interpretation giving efficiency is improved; and the interpretation content is more reliable.

The invention discloses a multi-stage difference uplift area ancient landform restoration method, and the method comprises the following specific steps: S100, carrying out the detailed interpretation of a seismic section, and recognizing a main unconformity surface; s200, finding out a stratum denudation original point and a maximum denudation point position, solving a stratum thinning rate, and calculating an original thickness of a denudation section; s300, an original deposition boundary is determined on the seismic backbone section, and denudation thickness recovery is carried out in combination with the residual thickness map; s400, identifying the mark layer; and S500, recovering the form of the ancient landform by using a marker bed-thickness analysis method based on a residual thickness method and an impression method. According to the method, partition difference recovery of stratum denudation thicknesses of different structure parts by tectonic movement is comprehensively considered, deposition-settlement compensation consistency is considered, the paleo-structure recovery precision is higher, the situation that whether erosion depression and residual hillocks exist on a paleo-erosion surface after paleo-denudation is not considered in a paleo-landform recovery method is improved, and the recovery efficiency of the paleo-landform recovery method is improved. And the problems of incomplete factors and limitation are solved.

This invention discloses a method and system for determining the true thickness of a formation, comprising the following steps: S1: Obtaining the apparent thickness of the target formation based on well logging and seismic data; S2: Obtaining the total dip angle and unconformity dip angle of the target formation based on core samples; S3: Obtaining the uplift dip angle of the target formation based on seismic data; S4: Establishing a true thickness calculation model based on the apparent thickness, total dip angle, unconformity dip angle, and uplift dip angle; S5: Calculating the true thickness of the target formation based on the true thickness calculation model. This invention overcomes the dependence of traditional measurements on field outcrops, and eliminates subjective human error through multi-angle statistical analysis and multi-parameter constraints of core samples, enabling accurate determination of the true thickness of formations in covered areas and complex structural zones.

The invention belongs to the technical field of basin simulation, and particularly relates to a mudstone compaction extrapolation method applicability discrimination method based on sound wave and density logging. The method comprises the following steps of: 1, selecting a continuous mudstone section to sample data points, valuing interval transit time delta tma of a rock skeleton, and drawing a plumbing relational graph; 2, identifying stratum interfaces with different interval transit time data convergence trends of upper and lower stratum mudstone sections according to the convergence trend of discrete distribution of data points; 3, obtaining a fitting straight line of each data point group segment or data point group segments above and below the target unconformity surface; 4, the difference between the buried depth corresponding to the baseline value delta t0 in the fitted curve and the buried depth corresponding to the researched unconformity surface is obtained, and the assumed stratum recovery denudation amount H is obtained; 5, obtaining the function relationship rho '(Z) of the density of the destination stratum group section with respect to the buried depth through logarithm fitting, and 6, calculating the recovery pressure Pb and the current pressure Px, and comparing the values of the recovery pressure Pb and the current pressure Px.

The application provides a reservoir quality prediction method based on a "top-slope-depression" superimposition process analysis, and relates to the technical field of oil and natural gas exploration and development; including the following steps: S1, analyzing the present structural characteristics of a target reservoir according to seismic data; S2, restoring a balanced profile, and analyzing the structural evolution process experienced by the reservoir since deposition; S3, analyzing the open and closed evolution processes of the reservoir diagenetic geochemical system according to the "top-slope-depression" superimposition process of the reservoir; S4, determining the diagenesis under different geochemical systems; S5, reservoir quality classification evaluation and spatial distribution prediction. The application uses seismic data to analyze the information of unconformity, overlying strata, burial depth and the like, analyzes the structural / geochemical system evolution process, predicts the distribution law of reservoirs of different levels, and solves the problems of reservoir distribution and pre-drilling prediction under the background of multi-period structural superimposition of deep old layer series.

The application discloses a method for identifying first and second sequence interfaces based on seismic data, which comprises the following steps: obtaining seismic data, identifying and selecting a target unconformity interface to be determined; taking the interface as a horizontal datum plane to perform palaeogeomorphology recovery processing and generating a flattened data volume; determining first and second sedimentary centers of a basin where the upper and lower stratum units of the interface are located respectively; measuring the lengths of the semi-major axes of the sedimentary basins where the upper and lower strata are located and calculating the planar distance between the two sedimentary centers; according to the ratio of the planar distance to the sum of the lengths of the two semi-major axes, determining whether the target interface belongs to a first sequence interface or a second sequence interface according to a sedimentary center migration mode. The application reduces the dependence on well logging data, introduces a mathematical threshold to abandon subjective experience judgment, realizes the objectification and semi-quantification of sequence interface classification, and provides reliable technical support for oil and gas exploration in areas with few or no wells.