317 results about "Arenite" patented technology

The invention provides a tight sandstone gas reservoir formation water division method based on mercury intrusion and online nuclear magnetic resonance, and relates to the field of gas reservoir formation water production, and the method specifically comprises the following steps: obtaining a tight sandstone core standard rock sample; cutting the rock core into two sections, and performing a high-pressure mercury injection experiment on the first section of the rock core; and scanning the nuclear magnetic resonance signal T2 spectrum curve of the rock core in the completely saturated water state and the area of the nuclear magnetic resonance T2 spectrum curve. And carrying out gas drive and nuclear magnetic scanning experiments. And sequentially increasing the displacement pressure differences to obtain a nuclear magnetic resonance correction curve under different displacement pressure differences. And drawing a water saturation and displacement pressure difference relation curve, and defining the critical pressure difference of different types of formation water production according to the curve form and the slope change rule. And processing the data to obtain the formation water production rule of the tight sandstone gas reservoir in different states. According to the technical scheme, the problem that in the prior art, the critical output pressure difference and the dynamic output rule of various types of formation water in different pore diameter ranges cannot be quantitatively represented is solved.

The invention provides a tight sandstone reservoir horizontal well three-dimensional comprehensive compressibility evaluation method and device, and belongs to the technical field of oil-gas exploration. The method comprises the following steps: performing three-dimensional modeling on geological attributes around a target horizontal well, wherein the geological attributes comprise lithology, natural fractures and oil-gas possibility; carrying out geological attribute assignment; fracturing crack propagation simulation is conducted on the penetrating interval of the target horizontal well trajectory; according to different fracture height sweep degrees of fractured fractures, establishing a mapping coefficient, and according to the mapping coefficient, mapping a geological attribute assignment result to the horizontal well to obtain a geological sweet spot index around the horizontal well; and obtaining a comprehensive compressibility evaluation result according to the evaluation parameters including the geological sweet spot indexes around the well. According to the method, lithology, natural fractures and oil-gas possibility in geological dessert attributes around a well are comprehensively considered and mapped into geological dessert indexes around the well, and then the geological dessert indexes around the well are combined with other geological, engineering and technological parameters, so that compressibility evaluation of the compact sandstone reservoir is realized.

The invention provides a sandstone-type uranium deposit sedimentary facies identification method, system and device and a medium, and belongs to the technical field of sedimentary facies identification, and the method comprises the steps: obtaining sandstone-type uranium deposit sedimentary facies multi-source data; time-frequency domain feature data, texture feature and waveform feature data and element ratio feature and statistical feature data related to sedimentary facies in the sedimentary facies multi-source data are extracted; time sequence features, three-dimensional structure features and metallogenic environment features are extracted from the feature data and weighted fusion is carried out to obtain the sedimentary facies category recognition probability. Multi-dimensional information complementation is realized by combining logging, earthquake and geochemical data, covering vertical lithology change, three-dimensional sand body distribution and a sedimentary facies state in a redox environment scene, and the focusing capability and the recognition precision of the model are effectively improved.

The invention discloses a low-permeability sandstone water locking-water sensitivity synergistic plug removal deep acidizing treatment method which is suitable for a low-permeability sandstone reservoir in an offshore high-temperature and high-pressure environment (120 DEG C, 40 MPa). According to the method, acidizing fluid is adopted, and the acidizing fluid is prepared from 18%-22% of chelating type composite organic multi-element retarded acid HWCP, 1.5%-2.5% of clay stabilizer HTW, 1.5%-2.5% of waterproof locking agent HAR, 18%-22% of pressure reduction cleanup additive HWDA, 5%-7% of corrosion inhibitor HWCI and the balance filtered seawater. The acidizing fluid is prepared by stirring at normal temperature and normal pressure, and stays for 6-12 hours after being injected into a reservoir. The HWCP slowly dissolves blockages, and the acting distance reaches 11 m; the HTW anti-swelling rate is greater than or equal to 90%, and clay expansion is inhibited; the HAR prevents water blocking; secondary precipitation is reduced through HWDA; and the corrosion rate is controlled to be 15.1108 to 26.1274 g / m < 2 >. H through HWCI. According to the method, the permeability of the reservoir is recovered by 122.09%-627.1%, the yield-increasing multiple ratio is 1.60-2.91, and the high efficiency is verified through 7-well-number field application. The method is simple in process, adapts to the marine environment, and comprehensively solves the problems of water locking, water sensitivity and secondary precipitation.

The invention discloses a method for predicting a high-quality reservoir of deep-buried matrix type tight sandstone. The method comprises the following steps: acquiring production data and reservoir physical property parameters of a target work area; drawing a porosity cumulative frequency and cumulative probability distribution diagram and a permeability cumulative frequency and cumulative probability distribution diagram according to the production data and the reservoir physical property parameters; respectively determining a porosity inflection point, a first permeability inflection point and a second permeability inflection point according to the porosity cumulative frequency and cumulative probability distribution diagram and the permeability cumulative frequency and cumulative probability distribution diagram; selecting a plurality of samples of the target work area, and determining a permeability upper limit point according to the plurality of samples; according to the porosity inflection point, the first permeability inflection point, the second permeability inflection point and the permeability upper limit point, reservoir types are divided, and a high-quality reservoir is determined. The method not only provides scientific basis for tight sandstone gas prediction, but also provides theoretical guidance for exploration and development of tight sandstone gas with similar geological backgrounds, and has important practical value for exploration and development of deep-layer and ultra-deep-layer tight sandstone gas.

The invention belongs to the field of rock burst prevention and control coal mining methods, and particularly relates to a roof-cutting pressure-relief coal mining method under the stratum condition of a deeply-buried sandstone group. Comprising the following steps: respectively constructing detection drill holes inside and outside a first mining working face, and checking an interface in a stratum in a hydraulic pressure test mode so as to accurately determine a key layer. On the basis, on the basis of gob-side entry retaining, roof cutting drill holes are creatively constructed in a roof cutting special roadway and a transportation roadway correspondingly, so that roof cutting work is conducted on key layers in a bent sinking zone rock stratum, a water flowing fissure zone and a caving zone rock stratum in a roof; therefore, the suspended roof length of a part of the water flowing fractured zone rock stratum and the caving zone rock stratum is reduced but still reserved, the supporting force needing to be borne by the gob-side entry retaining is reduced, and a sheltering space is provided for the gob-side entry retaining. The bent sinking zone rock stratum is subjected to vertical drilling top cutting, and a top cutting transition area is reserved, so that superposition of fracture of the bent sinking zone rock stratum and fracture of the water flowing fissure zone rock stratum can be reduced, and the stratum pressure needing to be borne by gob-side entry retaining is reduced to the maximum extent.

The invention provides a volcanic rock matrix-fracture dual-medium type oil reservoir oil layer evaluation method and system, and belongs to the technical field of geological engineering, oil reservoir processes and well logging interpretation. According to the method, a matrix porosity calculation chart is established through core scale logging, crack pores are added into an Archie sandstone conductive model to serve as conductive channels, the crack porosity is deduced, and finally, the matrix pores, the crack pores, the oil saturation and an oil testing result are combined to obtain the conductivity of the Archie sandstone. And the quantitative distinguishing method for the matrix-fractured dual-medium oil and gas reservoir oil layer is formed. According to the method, the gap of simultaneous research of the matrix and the crack is filled, the oil layer recognition precision is improved, the judgment standard is more strict and more reasonable, and the reliability is high.

The invention discloses a tight sandstone gas reservoir horizontal well volume fracturing fracture characteristic parameter obtaining method and device and a storage medium. The method comprises the following steps that S10, the change relation of the pumping pressure, the displacement and the sand ratio along with time is obtained based on a fracturing construction curve; and S20, the effectiveness of fracturing construction is judged. And S30, geological parameters, well completion parameters and construction parameters of a fracturing implementation well are obtained, and a horizontal well fracturing geological model, a stress field model and a wellbore model are established. And S40, fracturing pump injection program parameters are input based on the fracturing construction bulletin. And S50, on the basis of the geological parameters, the well completion parameters and the construction parameters, fracturing crack characteristic parameters are solved. With the adoption of the method, the form and characteristic parameters of the fracturing crack can be obtained after the field fracturing construction is finished, so that a support is provided for evaluating the fracturing yield increasing effect.

The invention discloses a multi-scale analysis-based gas-water seepage field simulation method, which specifically comprises the following steps of: based on a digital rock core reconstructed by a CT (Computed Tomography) scanning image of a typical rock sample of a target reservoir, adopting a microcosmic pore network flow simulation technology; the change rule of the stratum seepage capacity in different stratum pressure gradients and water drive processes, the use degree of a pore network and the water drive process in a pore are calculated, and then a correlation chart with the rock permeability and the pressure gradients is established and used for rapid measurement and calculation of the actual reserve use degree and the recovery degree of the water-invaded sandstone gas reservoir. The method starts from a rock microcosmic pore channel, the scale is amplified to a macroscopic oil reservoir during application, the method has the cross-scale characteristic, and the method is used for rapidly measuring, calculating and evaluating the reserve utilization degree and the recovery degree of the actual water-invaded sandstone gas reservoir and is beneficial to rapid development of the gas reservoir engineering scheme design in a mine field.

This disclosure relates to the field of petroleum exploration and development technology, and in particular to a method and system for determining bottom water intrusion characteristics. The method includes: determining the water permeability and the correlation coefficients between the matrix and fractures in a target block of a fractured sandstone gas reservoir; establishing and solving a mathematical model for cylindrical bottom water intrusion in a single well of the fractured sandstone gas reservoir based on the determined water permeability and the correlation coefficients between the matrix and fractures, obtaining a pressure function representing the difference between the original water pressure and the pressure at any point within the gas reservoir; using the obtained pressure function, determining the dimensionless bottom water intrusion volume; and determining the cylindrical bottom water intrusion characteristics of the dimensionless bottom water intrusion volume with respect to dimensionless time based on the determined dimensionless bottom water intrusion volume. By establishing a mathematical model of bottom water intrusion and calculating the cumulative water intrusion volume, the bottom water intrusion characteristics are determined, enabling an understanding of the entire dynamic process of bottom water intrusion in the reservoir.

This invention belongs to the fields of rock mechanics, geological engineering, and geophysical exploration technology. Specifically, it discloses a method and system for constructing a mapping relationship between acoustic wave velocity and surrounding rock stress. The method includes: performing uniaxial graded loading on a standard sandstone sample and simultaneously measuring the P-wave velocity and S-wave velocity under each stress level; then fitting a linear mapping relationship between the P-wave / S-wave velocity ratio and the axial stress of the surrounding rock; introducing joint correction coefficients and water content correction coefficients to optimize the linear mapping relationship and constructing an acoustoelastic model; and using the acoustoelastic model and field-measured wave velocity data to invert the stress state of the actual surrounding rock, thus completing the construction of the acoustic wave velocity-surround rock stress mapping relationship. This invention solves the problems of traditional wave velocity-stress relationships, which, when describing the nonlinear response of rocks at different stress stages, are not sensitive enough to subtle stress changes and lack a complete, high-precision, and interference-resistant stress inversion calculation method, making them difficult to directly apply to complex actual engineering environments.

The present application relates to a kind of thin interbed type deposit high-quality reservoir prediction method, comprising: obtaining the geological data, seismic data and well logging data of the region to be analyzed, well seismic combination tracking interpretation oil group top, bottom interface;With the oil group top, bottom interface as constraint, utilize the three-dimensional seismic data acquisition three-dimensional seismic inversion data;With the oil group top, bottom interface as constraint, according to the three-dimensional seismic inversion data and the well logging data are combined, obtain oil group internal relative isochronous sedimentary interface;According to the oil group internal relative isochronous sedimentary interface, based on three-dimensional seismic inversion data, each small layer reservoir plane distribution in oil group is solved;According to the three-dimensional seismic inversion data, based on the information of actual drilling well, sandstone probability body seismic data is solved;Utilize actual drilling well information to construct reservoir classification standard, realize single well reservoir type division;According to the sandstone probability body seismic data, with single well reservoir type as constraint, carry out high-quality reservoir space distribution prediction.

The invention belongs to the technical field of rock particle screening, in particular to a rock particle screening device for loose sandstone artificial core preparation, and provides the following scheme that the rock particle screening device comprises a screening box and two groups of screening plates, and further comprises a separation frame mounted in the middle of the screening box, and the two groups of screening plates are rotationally connected with the side edge of the separation frame through torsional springs; a cavity with an opening in the bottom is formed in the middle of the partition frame, meshes are formed in the two sides of the cavity and located above the sieve plate, a magnetic attraction piece and an electromagnetic block which are matched are arranged below the sieve plate, and the sieve plate swings through changes of magnetic attraction force of the electromagnetic block and the magnetic attraction piece. Rock particles on the sieve plate are alternately impacted and dispersed between the sieve plate and the side edge of the separation frame for screening through movement operation of the sieve plate in a sudden change state, so that the agglomerated rock particles are effectively dispersed, the screening effect is improved, and the screening operation efficiency is improved.

The invention discloses a paleo-gradient constraint reservoir characterization attribute for deep fan delta sedimentary facies characterization. The paleo-gradient constraint reservoir characterization attribute comprises the following steps: 1) carrying out multiple seismic attributes of a target stratum and carrying out normalization processing; 2) seismic attribute optimization is carried out by using the correlation with the sandstone thickness; 3) fitting a multiple linear regression relationship between the sandstone thickness and the optimized seismic attributes; 4) drawing a whole-area sandstone thickness prediction contour map; 5) solving an ancient slope on the ancient landform map; 6) drawing a whole-region ancient slope contour map; 7) acquiring a relation inflection point between the sandstone thickness and the paleo-slope in the research area; 8) predicting sandstone thickness and paleo-gradient by using seismic attributes to establish paleo-gradient constrained reservoir characterization attributes; and 9) calculating all-region paleo-gradient constraint reservoir representation attributes, and drawing a contour map as a basis for depicting the deep fan delta sedimentary facies. The method solves the problem that seismic attribute representation sedimentary facies lacks environmental information and the problem of multiplicity of solutions of deep fan delta seismic reflection representation sedimentary facies.

A method for constructing an artificial water-conducting channel through pulse hydraulic fracturing of drainage boreholes in a roof aquifer includes constructing an artificial water-conducting channel in a sandstone fissure aquifer through arrangement of drainage boreholes and pulse hydraulic fracturing, which improves the permeability of dense and intact sandstone rock masses. The artificial water-conducting channel formed through arrangement of drainage boreholes is connected to discontinuous water-bearing areas and water-rich areas, and water from roof sandstone fissures is diverted to the drainage boreholes through the artificial water-conducting channel, thereby achieving effective drainage of the boreholes and expanding a radiation range of single-borehole drainage. The method not only avoids the arrangement of excessive drainage boreholes and significantly improves the drainage efficiency of prospecting and drainage boreholes, but also facilitates advance drainage during the mining process. The method enables effective control of mine water hazards, thereby ensuring safe production of the mine.

The invention relates to the technical field of oil and gas reservoir damage evaluation, in particular to a method and device for calculating irreducible water saturation of a tight sandstone reservoir, electronic equipment, a storable medium and a computer program product. The method comprises the following steps: acquiring a pore distribution curve of a compact sandstone sample; based on the pore distribution curve of the compact sandstone sample, determining the capillary bound water content of different pressure differences of the compact sandstone reservoir; carrying out total rock and clay mineral analysis on the compact sandstone sample to obtain the content of the clay bound water in the compact sandstone reservoir; and obtaining the irreducible water saturation of the tight sandstone reservoir based on the capillary irreducible water content and the clay irreducible water content. According to the method, the relationship between the absolute content, the pore distribution, the stress distribution and the interfacial tension of the clay mineral and the irreducible water saturation is established, so that qualitative and quantitative analysis on the irreducible water saturation is quickly and accurately performed.

The invention belongs to the technical field of anti-seepage curtains of red-bed landfills, and discloses an optimal design method for a vertical anti-seepage curtain of an irregular landfill in a red-bed region, which adopts a drilling, geological radar and X-ray diffraction combined technology in the exploration and data acquisition stage to clearly distinguish hydrophilic expansive mudstone and high-permeability sandstone, and the optimal design method for the vertical anti-seepage curtain of the irregular landfill in the red-bed region is provided for the vertical anti-seepage curtain of the irregular landfill in the red-bed region. A space coupling model of the pile body and the red rock stratum is established by means of three-dimensional laser scanning, and the lithologic boundary of the dual seepage system is defined; in the model construction stage, parameter distribution is analyzed through a Markov random field model, regular updating is conducted in combination with a Kalman filtering algorithm, and dynamic changes such as sandstone fracture expansion caused by pile settlement can be adapted; a modified bentonite and nanoscale montmorillonite composite material is used in a sandstone area, construction is conducted through a high-pressure jet grouting technology, the permeability coefficient is set to be that the insertion depth extends to the complete bed rock by 2-2.5 m, and the problem of local leakage caused by the fact that the seepage-proofing design is not matched with the actual conditions of a red layer is solved.

The embodiment of the application relates to the technical field of sandstone type uranium ore exploration, and particularly relates to a method for determining a favorable area of a sandstone type uranium ore, which comprises the following steps: collecting well logging data of an exploration area of the sandstone type uranium ore, and gradually determining argillaceous content, total porosity of the exploration area, sandstone content of a sand and shale mixed matrix, longitudinal wave time difference, transverse wave time difference and density, equivalent elastic modulus of dry rock of the exploration area, and conversion relationship between longitudinal wave velocity and transverse wave velocity of rock under saturated fluid condition and a transverse wave velocity prediction curve; then, longitudinal wave impedance, velocity ratio of longitudinal wave and transverse wave and a density model are established; according to the model, three-dimensional elastic data bodies of impedance, density and shear modulus of longitudinal wave and transverse wave are determined by inversion; and according to the three-dimensional elastic data bodies, the favorable area of the sandstone type uranium ore is determined. The method for determining the favorable area of the sandstone type uranium ore according to the embodiment of the application can effectively improve the prediction accuracy of a favorable area of a sandstone type uranium ore.

The invention discloses a quantitative evaluation method for the transverse plugging performance of a multilayer sandstone oil reservoir fault. The quantitative evaluation method comprises the steps that a layer surface model and a fault model which can reflect a stratum space framework are established; obtaining a three-dimensional lithofacies model; acquiring the contraposition condition of two sand shale reservoirs of the fault; calculating an improved transverse plugging coefficient; and performing quantitative evaluation on the fault plugging property according to data such as an oil field seismic section and tracer test and comprehensive analysis of a numerical simulation method. According to the method, the multi-layer overlapping effect is considered, the influence of the fault displacement on mudstone smearing continuity and lithologic configuration can be considered, the threshold chart of the fault static transverse connectivity is established, verification is conducted in combination with a numerical simulation method, the fault plugging performance prediction precision can be effectively improved, and the fault plugging performance prediction accuracy is improved. And a reliable basis is provided for further development and adjustment of the multi-layer sandstone reservoir.

The invention discloses a method for judging interlayer oxidation intensity of lower chalkbroth sandstone based on three-phase clay minerals, and relates to the technical field of uranium mine geological exploration. Obtaining a three-phase clay mineral combination index calculation formula; the calculation formula of the three-phase clay mineral combination index represents the relationship between the mineral content of the chalkline sandstone under the three-phase clay minerals and the three-phase clay mineral combination index; obtaining the content of illite, illite-montmorillonite mixed layer minerals and chlorite in the lower chalkbroth system sandstone sample, and substituting the content of illite, illite-montmorillonite mixed layer minerals and chlorite into a three-phase clay mineral combination index calculation formula to obtain the three-phase clay mineral combination index of the lower chalkbroth system sandstone sample; and determining the oxidation intensity category corresponding to the three-phase clay mineral combination index of the lower chalkbroth system sandstone sample as an oxidation intensity classification result of the lower chalkbroth system sandstone sample. The method can be used for accurately judging the interlayer oxidation intensity of the chalkbroth sandstone.

The invention discloses a tight sandstone reservoir water-containing gas well water block removing agent and a preparation method and application, belongs to the technical field of gas reservoir development, and is characterized in that the water block removing agent comprises the following components in parts by weight: 20-35 parts of an ampholytic surfactant, 0.3-0.5 part of a fluorocarbon surfactant, 5-10 parts of a wetting agent, 5-10 parts of a solvent and 30-45 parts of water. The prepared water block removing agent is easy to biodegrade and low in surface tension and interfacial tension, the wettability of a rock core can be gradually changed from hydrophilic to hydrophobic, the rock wettability is effectively changed, the interfacial tension between fluid and reservoir rock is reduced, the permeability of the rock core is improved, and then the single-well recovery efficiency of a tight sandstone gas reservoir water-containing gas well is improved.

The present application relates to a method for dividing weathering crust structure by using well logging curve and petrology characteristics, comprising: identifying and obtaining the distribution range of weathering crust in width through seismic synthetic record; selecting multiple detection wells, and obtaining the well logging data of the multiple detection wells in vertical direction respectively; identifying and obtaining the porosity characteristics of the rock stratum of each detection well; identifying the mudstone layer and sandstone layer in the target layer section which are not affected by weathering as the reference for identifying the different structure layers of weathering crust, and determining the distribution range of weathering crust in vertical direction in each detection well; establishing the weathering crust mode in the distribution range of weathering crust in vertical direction in each detection well, and dividing the distribution range of weathering crust structure in the detection well according to the weathering crust mode; and obtaining the structure characteristics of the whole weathering crust. The method is fast, accurate and operable.

The invention provides a well spacing method for a multi-thin-layer tight sandstone gas reservoir under complex landform conditions. The well spacing method comprises the following steps: finely describing a sand body structure, determining the development scale and characteristics of a single sand body, and constructing a width-to-thickness ratio empirical formula of the single sand body; according to a sedimentary microfacies research result of a to-be-distributed well area and a single sand body width-to-thickness ratio empirical formula, drawing a plane distribution diagram of each layer of sand body, according to a reservoir parameter standard of the to-be-distributed well area, compiling and developing a favorable area in a layered manner, and overlapping to form a construction and production favorable area plane graph; collecting interference well testing data of a to-be-distributed well area or an adjacent area, counting well row spacing when interference is seen so as to determine reasonable well spacing of the to-be-distributed well, and carrying out numerical simulation to optimize the well pattern model; according to the method, topographic and geomorphic characteristics are considered as a whole, and in a construction and production superposition favorable area, a regular hexagon seven-point well pattern is adopted for well spacing, so that the well pattern is matched with a topographic and geomorphic target body. The problem that in the prior art, a multi-thin-layer sandstone gas reservoir is not prone to forming a well site under the complex landform condition is solved.

The invention provides a residual dessert positioning method and device for a tight sandstone oil and gas reservoir, and belongs to the field of petroleum and natural gas exploration and development, and the method comprises the steps: building a block three-dimensional geological model according to block two-dimensional seismic data; analyzing the block mountain-building movement to obtain mountain-building movement mechanical characteristic information corresponding to the large-batch reservoir natural fractures; single well geomechanics is analyzed, and rock mechanical behavior characteristic parameters are obtained; establishing a three-dimensional finite element model, and calculating a natural fracture damage mechanical value according to the three-dimensional finite element model to obtain natural fracture distribution data in the reservoir; comparing the natural fracture distribution data in the reservoir with the phenomenon embodied in the observation phenomenon; and superposing the well position distribution of the existing high-yield well and the natural fracture damage mechanical numerical distribution diagram to obtain the residual dessert position of the tight sandstone oil and gas reservoir. The method and the device for positioning the residual sweet spots of the tight sandstone oil and gas reservoir are high in accuracy and high in efficiency.

The invention provides a sandstone reservoir porosity quantitative prediction method under a double-height and double-depth background, and relates to the technical field of oil-gas exploration and development, and the method comprises the steps: obtaining a rock sample of a target stratum of a research region; determining lithofacies types of sedimentary rocks in the research area; obtaining particle size distribution histograms of different lithofacies types through particle size analysis; measuring the pore size and the pore distribution type in the rock sample; determining the diagenesis type of the research area; establishing a statistical relationship between the porosity and the ground temperature gradient through the pore distribution type and the pore size; constructing a pressure field of the research area to obtain a pressure coefficient of the research area; and performing fitting superposition through the porosity, the lithofacies type, the particle size distribution histogram, the statistical relationship, the pressure coefficient and the diagenesis type, and predicting the porosity distribution range of the sandstone reservoir. By comprehensively considering multiple factors such as formation temperature, pressure, burial depth, diagenesis and the like, high-precision prediction of the reservoir porosity is realized.

The invention discloses a method and system for predicting the maximum height of an oil column of an upper-generation lower-storage type sandstone reservoir, and the method comprises the steps: building a dynamic critical equilibrium relational expression which takes hydrocarbon expulsion intensity and oil column formation height as unknown quantities and is used for representing an oil column formation condition and a force equilibrium relation according to the basic parameters of a hydrocarbon source rock stratum to be researched; according to pyrolysis experiment parameter data of multiple wells in the hydrocarbon source rock stratum to be researched, hydrocarbon expulsion intensity at different depths is calculated; and substituting the hydrocarbon expulsion intensities at different depths into the dynamic critical equilibrium relational expression so as to obtain the maximum oil column formation height at different depths. According to the method, the reliability and the accuracy of predicting the maximum height of the oil column of the upper-growing lower-storage type sandstone reservoir are improved.

The application discloses a horizontal well geosteering method, comprising the following steps: acquiring basic data of adjacent wells around a to-be-drilled horizontal well; comparing target reservoirs to obtain the numerical values of the top depth and the bottom depth of the target reservoirs of the adjacent wells and the predicted values of the top depth and the bottom depth of the to-be-drilled horizontal well; comparing X-ray element data to predict the sandstone types of the target reservoirs and the reaction characteristics of the X-ray element data; obtaining the reservoir thicknesses of each adjacent well and the to-be-drilled horizontal well, and establishing a target reservoir thickness model; when the to-be-drilled horizontal well is under construction, drilling to a target point, analyzing and judging whether the actual sandstone type of a drilled formation is the predicted sandstone type, analyzing whether the actual sandstone type is consistent with the predicted value, and when the results are all yes, determining that the model is correct, and continuing to perform horizontal well geosteering. The method can timely correct the prediction result of a seismic inversion reservoir, provide a basis for trajectory adjustment of horizontal well construction, improve the drilling rate of the reservoir, and improve the success rate of trajectory adjustment.

The invention relates to a sandstone reservoir permeability depth lower limit prediction method and device, equipment and a medium, and relates to the field of oil and gas exploration and development, and the method comprises the following steps: determining a main reservoir forming period of oil and gas reservoir forming in a research area; recovering the structure uplift denudation amount of the main reservoir forming period in the research area; obtaining the permeability depth lower limit of the sandstone reservoir according to the structural uplift denudation amount-critical burial depth relational expression; wherein the structural uplift denudation amount-critical burial depth relational expression is as follows: y = K * e lambda x, in the expression, y is the critical burial depth, x is the structural uplift denudation amount, K is the lithologic parameter, and lambda is the attenuation coefficient. According to the prediction method provided by the invention, through a specific prediction process, the problems of multi-screen strong denudation cumulative effect and permeability critical burial depth quantification of a research area are solved, and efficient and accurate prediction of the sandstone reservoir permeability depth lower limit is realized.

The application provides a method and system for determining the permeability of a tight sandstone reservoir. The method comprises: obtaining the porosity and pore throat radius distribution spectrum of the target reservoir; dividing the pore throat radius distribution spectrum of the target reservoir into two parts, i.e., a large-aperture part and a small-aperture part; determining the ratio of the cumulative amplitude of the pore throat radius distribution of the large-aperture part to the cumulative amplitude of the pore throat radius distribution of the small-aperture part based on the pore throat radius distribution spectrum of the large-aperture part and the small-aperture part of the target reservoir; and determining the permeability of the target reservoir based on the ratio and the porosity of the target reservoir. The method can accurately determine the permeability of a reservoir in a tight sandstone reservoir with strong heterogeneity.

The invention belongs to the technical field of petroleum and natural gas exploration and development, and provides a method and a device for analyzing the rock resistivity of glauconite sandstone. Generating a first relation curve and a second relation curve according to the different glauconite content conditions, the rock water saturation of the glauconite sandstone, the rock resistivity of the glauconite sandstone and the rock resistance increase rate of the glauconite sandstone corresponding to the different glauconite content conditions; and analyzing the change trend and the change degree of the rock resistivity and the rock resistance increase rate of the glauconite sandstone to obtain an analysis result. According to the analysis method provided by the embodiment of the invention, quantitative analysis can be carried out on the low-resistivity cause of the glauconite sandstone stratum, and the influence and degree of the change of the content of glauconite, the change of the rock resistivity of the glauconite sandstone and the change of the rock resistance increasing rate can be quantitatively judged.