21 results about "Rock density" patented technology

The present application relates to the geological exploration technical field, more particularly, to a deep water super shallow layer natural gas reservoir rock physics shear wave velocity prediction method, comprising: calculating equivalent bulk modulus, shear modulus and density of a plurality of mineral mixed matrix according to shale content; then calculating skeleton bulk modulus and shear modulus; then calculating saturated rock bulk modulus and shear modulus through a model, and calculating saturated rock density through rock matrix density; distributing longitudinal and transverse velocities of suspended state and bearing state, and calculating equivalent longitudinal and transverse wave velocities; using equivalent longitudinal wave velocity to construct an inversion objective function with longitudinal wave velocity as a known condition; comparing actual longitudinal wave velocity with calculated longitudinal wave velocity; realizing nonlinear inversion of transverse wave velocity according to an algorithm, and obtaining transverse wave velocity of a to-be-inverted work area. The present application simultaneously considers rock physics models of particle suspended state and bearing state, and realizes transverse wave velocity prediction and deep water super shallow layer natural gas reservoir transverse wave velocity direct inversion.

The invention provides a modeling method and a saturation prediction method of a rock physical model containing non-uniformly distributed hydrate sediments. Comprising the steps of obtaining model parameters, calculating the porosity of a mineral skeleton based on the model parameters, calculating the bulk modulus and the shear modulus of a dry hydrate skeleton, calculating the bulk modulus and the shear modulus of a dry mineral skeleton, and calculating the bulk modulus and the shear modulus of a dry composite skeleton composed of the dry mineral skeleton and the dry hydrate skeleton. And calculating the rock bulk modulus and shear modulus when the fluid is saturated, calculating the rock density value when the fluid is saturated, and calculating the stratum longitudinal wave velocity and the stratum transverse wave velocity. According to the method, on the basis of the forming mechanism and distribution characteristics of the non-uniformly distributed hydrates, the non-uniformity of the hydrates and mineral particles is considered in the modeling process, the hydrates and the mineral particles are regarded as two independent rock frameworks, and the isotropic rock physical model suitable for the non-uniformly distributed hydrates is constructed.

The invention discloses a Young impedance and longitudinal and transverse wave velocity ratio nonlinear direct seismic inversion method based on an accurate YIRD-Zoeppritz equation. The Young impedance and longitudinal and transverse wave velocity ratio nonlinear direct seismic inversion method comprises the steps that the YIRD-Zoeppritz equation is obtained, and the Young impedance YI, the longitudinal and transverse wave velocity ratio PSR and the rock density are inversed through an ADA-MCMC-LpSC nonlinear inversion algorithm providing sparse prior information based on the Lp norm. Based on an accurate YIRD-Zoeppritz equation, the accurate prediction method for the Young impedance and the longitudinal and transverse wave velocity ratio under the ADA-MCMC-LpSC nonlinear optimization inversion algorithm is achieved, and the key geophysical problem that the accurate Zoeppritz equation cannot be directly used for predicting the Young impedance and the longitudinal and transverse wave velocity ratio parameters at the same time at present is solved.

The invention discloses a coal rock density calculation method, device and equipment. The method comprises the following steps: firstly, acquiring total rock mineral X diffraction experiment data, X-ray element data of target position coal rock, coal rock average porosity and coal rock average water saturation; obtaining the ash content mineral type of the coal rock according to the total rock mineral X diffraction experiment data; calculating the type of the ash mineral and the mass fraction of the organic matter mineral by utilizing the mass fraction of the characteristic element in the ash mineral and the X-ray element data; calculating the skeleton density of the coal rock by using the mineral density of the coal rock, the ash content mineral type and the mass fraction of the organic matter mineral; and calculating the density data of the coal rock at the target position by using the average porosity of the coal rock, the average water saturation of the coal rock and the skeleton density of the coal rock. In the process, after X-ray element data is obtained on a drilling site, a series of element calculation is carried out, the density data of the coal rock at the target position can be obtained, the calculation method is simple, and the requirement for timeliness while drilling is met.

The application provides a method for calculating the density of a shale gas reservoir by using element logging, and the method comprises the following steps: according to the content of reservoir elements measured by element logging and the molecular formula of minerals in the reservoir, the mass fraction of each mineral and the density of rock framework are inversely calculated; according to the fitting curve of the content of nickel elements, the total organic carbon content in the reservoir is calculated; based on the minerals in the reservoir, the porosity of the shale gas reservoir is calculated; according to the content of illite, the water saturation and the gas saturation are calculated; and according to the calculation results, the rock density of the shale gas reservoir is calculated. The mineral component content and the rock framework density are inversely calculated by using element logging data, and then the total organic carbon content, the porosity and the water saturation and the gas saturation are sequentially calculated, so that the rock density of the reservoir is obtained, the calculation result error is small, the evaluation of the reservoir physical property is relatively accurate, and the theoretical and data support is provided for shale gas development; the method is simple in operation, reduces the difficulty of physical property parameter measurement, and is suitable for a wide range of applications.

The invention relates to the technical field of coal low-carbon mining, and discloses a sandy gravel geological underground diaphragm wall grooving precision intelligent control method and system.The method comprises the steps that a purified surrounding rock density change curve and a gravel enrichment area three-dimensional map are subjected to coal mine stratum fusion treatment, and a shaft surrounding rock stability coefficient is formed; combining the shaft surrounding rock stability coefficient with the real-time working parameters of the drilling machine, and outputting a coal mine stratum dynamic response index; the basic regulation and control parameters are subjected to coal mine construction multi-objective optimization calculation, and an optimal operation parameter combination suitable for a coal mine shaft is obtained; and generating a coal mine construction carbon efficiency index by the real-time carbon emission equivalent and the material carbon emission contribution value through specific weighted calculation of the coal mine. The system comprises a shaft surrounding rock data fusion analysis module, a coal mine grooving self-adaptive regulation and control module and a coal mine construction carbon effect monitoring module. The construction efficiency and green building requirements are both considered, and a complete technical solution is provided for underground diaphragm wall construction under the sandy gravel stratum condition.

The embodiment of the application relates to the technical field of seismic exploration, and discloses a brittle prediction method, device, equipment and medium for a rock reservoir, the prediction method comprising the following steps: based on well logging data of a target rock reservoir, a target layer section of the target rock reservoir is constructed according to rock components and rock physical characteristic parameters, so as to construct a rock physical model for representing the relationship between the volume modulus, shear modulus, rock density and the content of main brittle minerals of the rock; a model of a brittle indicator factor is constructed according to the rock physical model and the change of the content of the main brittle minerals, the brittle indicator factor being used for representing the relative brittle degree of the rock mass; and the brittle indicator factor is converted into actual brittleness for representing the actual brittle degree of the rock mass. The brittle prediction method disclosed by the application fully utilizes the rock physical characteristic analysis of the target rock reservoir to analyze the influence of the brittle minerals on the brittle prediction, and effectively improves the rationality and accuracy of the rock brittle prediction.

The invention relates to the technical field of safe blasting, in particular to a safe blasting method for a saturated zone deep rock stratum under a low-temperature condition, which comprises the following steps of: performing a rock mechanical property test on the saturated zone deep rock stratum under a low-temperature environment to obtain main mechanical parameters of rock density, wave velocity, porosity and Young modulus under different temperature conditions; based on test data, a dynamic constitutive model of the saturated zone low-temperature rock under the impact load effect is established, and the strain rate and the low-temperature effect are considered; according to the dynamic constitutive model, blasting parameters are optimized, and the blasting parameters comprise the explosive type, the explosive loading amount, the blast hole arrangement and the delay time; the method has the beneficial effects that the static and dynamic mechanical characteristics of the saturated zone low-temperature rock under different temperature and strain rate conditions are deeply revealed, the dynamic constitutive model is established, and a scientific basis is provided for cold region engineering design and blasting parameter optimization. An engineer can more accurately predict and control the rock breaking behavior in the blasting process, and the blasting efficiency and safety are improved.

The application discloses a rock characteristic stress identification method based on wave impedance characteristics, and comprises the following steps: S1, preparing a labeled rock sample; S2, collecting the longitudinal wave velocity under the uniaxial compressive strength condition; S3, calculating the rock density at each longitudinal wave velocity collection time; S4, calculating the rock wave impedance according to the data collected in S2 and S3; and S5, calculating the axial stress according to the axial load corresponding to each longitudinal wave velocity measurement time. The application provides a reliable and convenient quantitative identification method for the closed stress, cracking stress and damage stress of brittle rock. The method overcomes the limitations of the crack volume strain method, such as the solving precision and reliability, and the influence of the rock elastic modulus, Poisson's ratio value and natural fissure development degree.

The invention relates to an indoor evaluation method for well wall stabilizing capability of drilling fluid. The indoor evaluation method comprises the following steps: preparing a rock sample to carry out a drilling fluid and rock sample interaction experiment; determining a rock structure damage coefficient under the action of the drilling fluid through rock density and interval transit time tests; various mechanical experiments such as point load, compression resistance, tensile strength and fracture toughness are carried out, and the shale strength damage coefficient under the action of the drilling fluid is determined; based on rock strength weakening characteristics under the action of the drilling fluid, collapse pressure increment and fracture pressure decrement under the action of the drilling fluid are calculated, and a safety density window reduction coefficient under the action of the drilling fluid is obtained; the rock structure damage coefficient, the strength damage coefficient and the formation safety density window reduction coefficient are synthesized, the comprehensive coefficient of the drilling fluid well wall stabilizing capacity is calculated, and the larger the comprehensive coefficient is, the better the well wall stabilizing capacity is. The comprehensive influence of the drilling fluid on the rock structure, strength and safety density window is synthesized, and technical support is provided for guaranteeing the stability of the stratum well wall on site.

The utility model relates to the technical field of geophysical exploration, concretely relates to a kind of auxiliary device for rock density determination, including two support frames, lifting mechanism for controlling rock sample lifting is installed between two support frames, weighing device is equipped between two support frames, container is placed on the weighing device, the container top surface is equipped with opening, the lifting mechanism is connected with the rock sample by pulling rope.The utility model can keep sample in stationary state during rock (ore) density determination process, avoid because of human external force instantaneous change to cause balance to be more difficult to tend stable and read, effectively reduce manpower cost, substantially improve determination efficiency.

Disclosed are methods, systems, and computer-readable medium to perform operations for calculating pore pressure in a reservoir, the operations including: receiving input data including: (i) a rock density in the reservoir, (ii) seismic data measured in the reservoir, and (iii) pore pressure measurement data from a Modular Formation Dynamic Tester (MDT); calculating, based on the rock density, an overburden pressure volume of the reservoir; generating, based on the overburden pressure volume, an overburden pressure volume of the reservoir; generating, based on the seismic data, an acoustic impedance volume of the reservoir; generating, based on the effective stress and overburden volumes, an estimated pore pressure volume of the reservoir; and calculating, based on the estimated pore pressure volume, a pore pressure gradient map indicative of the pore pressure in the reservoir.

This invention discloses a method and apparatus for shale rock physical modeling. The method includes: determining a maturity index curve based on kerogen maturity correlation curves; determining the density, bulk modulus, and shear modulus curves of kerogen based on discrete data of kerogen modulus and the maturity index curve; determining the porosity curves of organic and inorganic matter based on the adsorbed gas and free gas content curves and the maturity index and density curves of kerogen; determining the dry rock density, P-wave and S-wave velocities, and shear modulus curves based on the density, bulk modulus, and shear modulus curves of kerogen, clay minerals, and other minerals, as well as the total porosity curve, and the porosity curves of organic and inorganic matter; and determining a shale rock physical model based on the dry rock density, P-wave and S-wave velocities, and shear modulus curves, and the bulk modulus and density curves of the mixed fluid. This method enables the reasonable establishment of a shale rock physical model based on the changes in organic matter during the maturation process.

The present application belongs to the field of tunnel and underground engineering geological survey and safe construction technology. A tunnel surrounding rock compressive strength evaluation method and system are proposed. The sound wave waveform travel time data and drilling process parameters in the tunnel advanced geological drilling construction process are obtained. The longitudinal wave velocity and transverse wave velocity are calculated based on the sound wave waveform travel time data, and then the dynamic elastic modulus, dynamic Poisson's ratio and rock integrity coefficient are calculated in combination with the rock density. The mechanical specific energy is calculated based on the drilling process parameters. With the drilling depth as the unified spatial coordinate axis, all the above parameters are aligned to the same depth point set to construct a multi-source fusion feature vector. The multi-source fusion feature vector is input into the preset surrounding rock compressive strength calculation model to obtain the continuous prediction profile of the surrounding rock compressive strength along the drilling depth. The present application realizes the rapid, continuous and high-precision evaluation of the tunnel surrounding rock compressive strength by fusing the multi-dimensional information of sound wave testing and drilling parameters, and provides a reliable basis for tunnel support design.

This invention discloses a method for monitoring the relative gravity of surface subsidence during coal mining. It involves deploying quantum gravity reference stations around the subsidence area, arranging relative gravimeters in a grid pattern within the basin, and arranging fiber optic gravity sensor chains in the underground roadway. Simultaneously, a UAV equipped with a cold atom gravity gradiometer performs periodic scans. Based on real-time data, a gravity field-mass migration model is established, correlating coal extraction volume, changes in rock density, and surface gravity anomalies. Wavelet multi-scale decomposition is used to eliminate geological background interference, and hydrological correction is applied, incorporating water level and porosity to optimize gravity variation values. When the corrected gravity variation exceeds a threshold, the azimuth of rock fracture is calculated using the gravity gradient tensor. Equivalent extraction thickness is derived based on gravity variation inversion, and the surface subsidence morphology is dynamically predicted using a subsidence basin model. A state vector is constructed by combining gravity, gradient, and deformation data, and multi-source fusion prediction is achieved through a filtering algorithm.

This invention discloses a method and system for predicting surface subsidence in goaf areas, belonging to the field of surface subsidence prediction technology. The method includes the following steps: collecting data on the uneven distribution of residual stress in the goaf area, constructing a three-dimensional seismic wave propagation scenario, and dividing energy-prone areas based on differences in rock density and elasticity; based on the spatial distribution data of these energy-prone areas, deploying graded stress release holes, and using a combination of directional pressure relief and deep grouting to form controllable stress buffer zones at energy-prone sensitive locations, thus establishing a stable residual stress background. This invention, by identifying energy-prone sensitive locations in the goaf in advance and constructing controllable stress buffer zones, transforms surface subsidence analysis from post-event analysis to pre-event perception. Furthermore, by combining dynamic stress and vibration time series to generate subsidence trend maps, it achieves forward identification and risk warning of secondary subsidence.

The application provides a carbon dioxide storage area safety geologic earthquake combined evaluation method, and the evaluation method comprises the following steps: S1, obtaining an isobath structure map based on three-dimensional seismic data and storage area drilling data; S2, obtaining a two-dimensional seismic profile according to the isobath structure map and interpreting the two-dimensional seismic profile as a two-dimensional geological profile; S3, obtaining overlying rock density ρ according to fault nearby well density logging data; S4, obtaining geological parameters according to the two-dimensional geological profile and calculating cross-section normal stress P; S5, obtaining fault zone argillan content S according to surrounding drilling data; S6, obtaining the formation pressure P1 of the target layer after gas injection according to the gas injection well; S7, obtaining a storage area safety index A according to the cross-section normal stress P and the formation pressure P1, and judging the safety of the storage area according to the safety index. The application provides an effective way for carbon dioxide storage area safety evaluation and provides a reference for carbon dioxide storage area oil and gas exploration and development.

The embodiment of the invention provides a method and device for evaluating a controllable shock wave permeation increasing effect in liquid mining, and belongs to the field of salt lake industry and petroleum industry, the method comprises the following steps: acquiring shock wave gas density, shock wave jet flow half width, rock density and shock wave acting position depth of a target liquid mining area impacted by target impact fluid; according to shock wave gas density, shock wave jet flow half width, rock density and shock wave action position depth, determining a reflection angle after shock wave and rock impact; determining the penetration depth of shock waves according to the shock wave gas density, the rock density and the energy-gathered jet theory; according to the shock wave gas density and the rock density, determining a post-impact permeation enhancement effect model; and according to the reflection angle, the penetration depth and the permeation enhancement effect model, evaluating the permeation enhancement effect of the target impact fluid. According to the method, effective evaluation of the permeation enhancing effect is realized.

The invention relates to the technical field of logging data interpretation, and particularly discloses a method and device for quantitatively evaluating the contribution degree of a tectonic extrusion overpressure cause, and the method comprises the steps: collecting logging, geological and seismic data of a target layer; calculating an overlying stratum load and a vertical effective stress based on the logging information; based on logging and geological data, a mudstone logging curve combination, a vertical effective stress-sound wave speed cross plot and a vertical effective stress-rock density cross plot are established, and structural extrusion type overpressure is judged; on the basis of the geological data and the overlying stratum load, the extrusion tectonic force of the target well is obtained through calculation; and based on the extrusion tectonic force, the formation pore pressure generated by the three-dimensional compaction effect under the extrusion tectonic force condition and the non-extrusion tectonic force condition is calculated, and the contribution degree of tectonic extrusion to formation overpressure is explained. The method is suitable for evaluating the sedimentary basin caused by the structural extrusion type overpressure, and the problem that one-dimensional simplification of a conventional stress state and real stratum compaction are contradictory in three-dimensional stress combined action is solved.

The embodiment of the invention provides a hydrogen production quantity prediction method, device and equipment, a medium and a product, and belongs to the technical field of geological exploration. The method comprises the following steps: constructing a geologic model of a to-be-predicted area, wherein the geologic model comprises a plurality of three-dimensional grid units; determining key parameters of each three-dimensional grid unit in the plurality of three-dimensional grid units based on geological features of the to-be-predicted region, wherein the key parameters comprise at least one of reaction rate constant, effective reaction volume, rock porosity, rock density, reaction duration, hydrogen production efficiency and hydrogen leakage flux; calculating based on the key parameters to obtain the unit hydrogen generation amount of each three-dimensional grid unit; and superposing the unit hydrogen generation amount of each three-dimensional grid unit to obtain a target hydrogen generation amount of the to-be-predicted region. The method can accurately predict the hydrogen generation amount of the target area.

The invention provides a method and device for determining the horizontal ground stress difference ratio of an unconventional oil and gas reservoir, and relates to the technical field of unconventional oil and gas reservoir exploration. According to the method, logging data, pre-stack seismic data, an orthotropic reflection coefficient equation and longitudinal wave modulus determined based on post-stack seismic data and rock density are adopted; and a seismic pre-stack inversion objective function under the Bayesian framework is constructed, so that the precision of an inversion result is higher, and inversion parameters comprise a parameter F representing the magnitude of horizontal ground stress, a parameter Y representing the vertical fracture density and a parameter Z representing the anisotropy of horizontal longitudinal waves. And after an inversion result of the target function is obtained, calculating the horizontal crustal stress difference ratio of the unconventional oil and gas reservoir according to the target Y parameter and an elastic stiffness matrix of the unconventional oil and gas reservoir determined based on the logging data, the rock density and the rock physical model. According to the method, the technical problem that the inversion precision is poor in the existing method for determining the DHSR is solved.