49 results about "Siltstone" patented technology

The invention discloses a method for determining the lower limit of plugging thickness of a silt rock stratum based on temperature-stress field simulation, which comprises the following steps: judging that the fracture pressure of a shale reservoir is less than the minimum starting pressure of an overlying silt rock stratum, and carrying out the following steps: wrapping the side surface of a roof rock sample with a heat insulation material; arranging heating and stress devices and temperature and strain sensors on the bottom surface of the rock sample, and arranging a plurality of strain sensors on the side surface of the rock sample at set intervals; heating the rock sample by using a heating device until the bottom temperature is the set temperature, applying stress to the bottom of the rock sample from small to large step by step by using a stress device until the set stress, stabilizing the temperature and the stress until the measured values of the sensors are stable, and determining the lowest position where the strain of the rock sample is not higher than the set strain according to the measured values of the sensors; determining the lower limit of top plate plugging thickness according to the distance from the position to the bottom surface; and similarly, determining the bottom plate plugging thickness lower limit. The method can reasonably quantify the lower limit of the plugging thickness of the top and bottom plates of the shale reservoir through joint simulation of the temperature field and the stress field.

The invention relates to a lacustrine facies shale conductive model considering organic matter influence and a saturability evaluation method, and belongs to the technical field of unconventional oil and gas reservoir oiliness evaluation, and the method comprises the following steps: 1) representing fluid information in a shale sample based on a pressure-maintaining closed sample and a two-dimensional nuclear magnetic resonance technology; 2) according to the organic carbon content and the clay content of the shale, dividing the lithology type of the lacustrine facies shale, and analyzing the relation between different lithology resistivity values and the porosity of free water and bound water; 3) selecting a siltstone interlayer sample, and inversely calculating a cementation index and a saturation index of the inorganic pore conductive network; 4) establishing a lacustrine facies shale parallel conductive model, and calibrating rock-electricity parameters according to lithology; 5, a lithology discrimination chart, a TOC prediction model, a bound water content prediction model and an effective porosity calculation model are established, and the oil saturation is explained according to different lithologies in combination with the lacustrine facies shale parallel conduction model.According to the method, accurate shale reservoir fluid information is provided, and a brand new thought is provided for rock electrical parameter calibration.

The invention discloses a method for determining the plugging thickness of a silt rock stratum based on temperature-pressure field simulation, which comprises the following steps: judging that the fracture pressure of a shale reservoir is smaller than the minimum starting pressure of an overlying silt rock stratum, and carrying out the following steps: wrapping the side surface of a roof rock sample by using a heat insulation sealing material; heating and pressurizing devices and temperature and pressure sensors are arranged on the bottom surface of the rock sample, and a plurality of pressure sensors are arranged on the side surface of the rock sample at set intervals; heating the rock sample by using a heating device until the bottom temperature is the set temperature, pressurizing the rock sample by using a pressurizing device until the bottom pressure is the set pressure, stabilizing the temperature and the pressure until the measured values of the sensors are stable, and determining the lowest position where the pressure of the rock sample is not higher than the second set pressure according to the measured values of the sensors; determining the lower limit of top plate plugging thickness according to the distance from the position to the bottom surface; and similarly, determining the bottom plate plugging thickness lower limit. The method can reasonably quantify the lower limit of the plugging thickness of the top and bottom plates of the shale reservoir through joint simulation of the temperature field and the pressure field.

The invention discloses a method for determining the plugging thickness of a complex lithologic layer based on simplified lithologic combination, and the method comprises the steps: determining the vertical superposition relation of a silty rock layer and a shale layer and the total thickness of the silty rock layer and the shale layer according to the lithologic longitudinal distribution characteristics of an overlying stratum; integrally forming and preparing a roof rock sample by combining the properties of siltstone and shale; arranging a plurality of groups of temperature sensors, pressure sensors and strain sensors on the side surface of the rock sample at set intervals; heating the rock sample until the bottom temperature is the set temperature, pressurizing until the bottom pressure is the set pressure, applying stress to the bottom of the rock sample step by step from small to large until the set stress, and stabilizing at the temperature, the pressure and the stress until the measured value of the sensor is stable; determining the lower limit of the roof plugging thickness according to the measured value of each sensor and the up-and-down superposition relationship; and similarly, determining the bottom plate plugging thickness lower limit. According to the method, through simplified lithology and combined simulation of a temperature field, a pressure field and a stress field, the lower limit of the plugging thickness of the shale reservoir complex lithology roof and floor is reasonably quantified.

The invention discloses a method for determining the plugging thickness of a complex lithologic layer based on temperature-pressure field simulation, and the method comprises the steps: determining the vertical superposition relation of a silty rock layer and a shale layer and the total thickness of the silty rock layer and the shale layer according to the lithologic longitudinal distribution characteristics of an overlying stratum in a set range; respectively obtaining formulas for preparing siltstone and shale through experimental fitting; integrally forming and preparing a roof rock sample; arranging multiple groups of temperature sensors and pressure sensors on the side surface of the rock sample at set intervals; heating the rock sample until the bottom temperature is the set temperature, pressurizing the rock sample until the bottom pressure is the set pressure, and stabilizing at the temperature and the pressure until the measured value of the sensor is stable; determining the lower limit of the roof plugging thickness according to the measured value of each sensor and the up-and-down superposition relationship; and similarly, determining the bottom plate plugging thickness lower limit. According to the method, the lower limit of the plugging thickness of the shale reservoir complex lithology top and bottom plates can be reasonably quantified through simplified lithology and joint simulation of a temperature field and a pressure field.

The invention discloses a siltstone adjacent layer plugging thickness lower limit determination method of a shale reservoir, which comprises the following steps: judging that the fracture pressure of the shale reservoir is smaller than the minimum starting pressure of an overlying siltstone rock layer, and executing the following steps: arranging heating, pressurizing and stress devices and temperature, pressure and strain sensors on the bottom surface of a roof rock sample; multiple groups of pressure and strain sensors are arranged on the side surface at set intervals; a heating device is used for heating the bottom of a rock sample to a set temperature, a pressurizing device is used for pressurizing the bottom to a first set pressure, a stress device is used for applying stress to the bottom of the rock sample from small to large step by step to a first set stress, and the stress is stable until measured values of all sensors are stable; determining the lowest position where the rock sample pressure is not higher than the second set pressure and the strain is not higher than the set strain according to the measured value of the sensor; determining a roof plugging thickness lower limit; and similarly, determining the bottom plate plugging thickness lower limit. The method can reasonably quantify the lower limit of the top and bottom plate plugging thickness through temperature, pressure and stress field joint simulation.

The invention discloses a portable sedimentary rock classification system and method based on deep learning, and relates to the technical field of rock identification and geological survey. The system comprises a portable microscopic image acquisition module, a cloud deep learning model and a mobile terminal module. A user shoots macroscopic or microscopic images of sedimentary rocks through a mobile phone, the macroscopic or microscopic images are uploaded to a cloud end and then subjected to feature extraction and classification through the optimized ResNet50 model, and a classification result is fed back to a user end in real time. The innovation points comprise: (1) adopting a macroscopic and microscopic data set training model to significantly improve the classification precision; (2) designing a portable microscopic module to realize rapid acquisition of microscopic images; (3) mobile terminal identification service; and (4) the ResNet50 model based on residual network optimization supports high-precision fine-grained classification (sandstone, conglomerate, siltstone and clay rock). Experiments show that the system classification accuracy reaches 99% or above, and compared with a traditional laboratory method, the efficiency is greatly improved. The method can be widely applied to geological exploration, teaching and scientific research and science popularization scenes.

The invention discloses a method for determining the plugging thickness of a complex lithologic layer based on temperature-stress field simulation, and the method comprises the steps: determining the vertical superposition relation of a silty rock layer and a shale layer and the total thickness of the silty rock layer and the shale layer according to the lithologic longitudinal distribution characteristics of an overlying stratum in a set range; respectively obtaining formulas for preparing siltstone and shale through experimental fitting; integrally forming and preparing a roof rock sample; arranging multiple groups of temperature sensors and strain sensors on the side surface of the rock sample at set intervals; heating the rock sample until the bottom temperature is the set temperature, applying stress to the bottom of the rock sample from small to large step by step until the set stress, and stabilizing at the temperature and the stress until the measured value of the sensor is stable; determining the lower limit of the roof plugging thickness according to the measured value of each sensor and the up-and-down superposition relationship; and similarly, determining the bottom plate plugging thickness lower limit. According to the method, the lower limit of the plugging thickness of the shale reservoir complex lithology top and bottom plates can be reasonably quantified through simplified lithology and joint simulation of a temperature field and a stress field.

The invention relates to the technical field of carbon dioxide sequestration simulation experiments, and discloses a simulation test device and method for monitoring activity of a carbon dioxide sequestration fault. The geological similar body sequentially comprises a first fine sand rock layer, a coal layer, a silt rock layer, a conglomerate layer and a second fine sand rock layer from the lower layer to the top layer in the test box body; the first fine sand rock layer, the coal layer, the silt rock layer and the conglomerate layer are filled in the test box body in a staggered manner to form a fault structure; the carbon dioxide injection assembly and the water injection assembly are located outside the test box body, and the output end of the carbon dioxide injection assembly is inserted into the fault position of the silt rock stratum; the output end of the water injection assembly is inserted into the conglomerate layer; real-time monitoring is carried out through a plurality of sensors, and real-time recording and monitoring of stratum mechanical behaviors and environmental thermal state changes in the carbon dioxide injection and storage process are achieved.

The invention discloses a fully-weathered argillaceous siltstone elastic-plastic damage constitutive model establishing system, and relates to the technical field of elastic-plastic damage constitutive models.The system comprises a parameter collecting and labeling module used for obtaining a data set and conducting classification labeling and test condition information; the parameter processing and matching module is used for preprocessing the parameters to extract a feature parameter set and performing information association to supplement boundary condition data; the damage elastic-plastic feature module is used for presetting a database and a weight distribution rule and performing weighted fusion to form a damage elastic-plastic coupling feature parameter set; the constitutive model construction module is used for constructing a constitutive model, performing iterative training on the constitutive model and calculating damage parameters and a prediction result; and the model verification report module is used for verifying the damage parameters and the prediction result and judging the effectiveness of the constitutive model according to the verification result. According to the method, the multi-dimensional core characteristic parameter set is constructed by obtaining mechanical property test parameters and the like, and the limitation of single test data is broken through.

The invention discloses an argillaceous siltstone geological anchorage deep foundation pit construction method, which relates to the technical field of building construction, and comprises the following steps: collecting stratum structure data, hydrogeological data and surrounding environment data of an anchorage area; determining an integral foundation pit form; a supporting scheme is designed, and a supporting structure type, a construction process and safety prevention and control measures are determined; verifying the stability of the supporting structure; construction resource investment, construction period and risk assessment data of different support schemes are collected, cost-benefit comparative analysis is carried out, and an optimal construction scheme is screened; the construction state is fed back in real time; and the anti-collapse, anti-seepage and anti-disturbance construction requirements under the muddy siltstone geological scene are met. According to the deep foundation pit construction method, a deep foundation pit construction full-process solution matched with the geological scene is formed by adopting double-row secant pile supporting, a targeted cast-in-situ bored pile and anchor cable construction technology and a near-high-rise special monitoring and inner supporting optimization technology.

The invention relates to a method for preparing thick mud from shield siltstone slag to prevent slurry loss, and belongs to the technical field of urban underground engineering construction. The method for preparing thick mud from shield siltstone slag to prevent slurry loss comprises the following steps: preparation of slurry: taking bentonite slurry as base slurry, and then adding waste weathered rock powder, calcium carbonate, sodium carbonate, xanthan gum or electropositive gel to prepare plastic flowing slurry, so that the slurry reaches certain density and viscosity; in the tunneling process of the shield tunneling machine, prepared slurry is injected out of a shield shell through a plurality of grouting holes in the radius direction and formed in the circumferential direction of the shield shell of the shield tunneling machine, and the slurry is diffused along the surface of the shield shell and fills gaps of a shield body within a certain range; according to the method, the waste soil generated by the shield tunnel can be effectively utilized, the moisture content and fluidity of the cabin soil are controlled, meanwhile, shield tail cement grout is prevented from entering the cutterhead and the soil cabin to threaten construction safety, operation is easy and economical, and the construction efficiency is improved.

The invention relates to the technical field of oil exploration, in particular to a complex shale strata lithology identification method based on logging information. The method comprises the following steps: determining lithology and classification of a coring sample through experimental means: mudstone, shale, siltstone, silty mudstone and marl-containing rock; logging curve response characteristics of different lithology in the shale bed series are extracted according to the lithology analysis result, and an average value is calculated; and performing fitting processing on a logging response parameter mean value or a parameter value after standardization of a mean value range, amplifying logging curve response characteristics of different lithologies, and further performing effective identification. According to the method for identifying the lithology of the complex shale bed series based on the logging information provided by the invention, aiming at the complex shale bed series, various lithology identification in the complex shale bed series can be accurately completed, so that the dessert section of the shale oil and gas reservoir is optimized, and the identification accuracy is improved.

The utility model provides a kind of microbiological solidification of making sample device for pisha sandstone, including making sample bottom cavity, making sample bottom plate, making sample cylinder and making sample top plate, at least four connecting springs are installed in the inner bottom surface of making sample bottom cavity with equal interval, making sample bottom plate is sleeved in making sample bottom cavity, and the top end of connecting spring is clamped in the bottom surface of making sample bottom plate;Making sample cylinder is clamped on making sample bottom plate, four making sample connecting columns are peripherally set with equal interval on making sample bottom plate outside making sample cylinder, making sample top plate is clamped at the top end of making sample cylinder by the effect of making sample connecting column and lock nut, and making sample operation is completed between making sample bottom plate, making sample cylinder and making sample top plate.The utility model can drive the vibration of making sample bottom plate and connecting spring in making sample bottom cavity by the vibration of vibration motor in use process, so as to mix pisha sandstone particles in making sample cylinder with bacteria liquid and reaction liquid uniformly, and the overall quality of prepared sample body is facilitated to improve.

The present invention relates to a lacustrine shale conductive model and saturation evaluation method considering the influence of organic matter, belonging to the technical field of oil content evaluation of unconventional oil and gas reservoirs, including: 1) characterizing fluid information in shale samples based on pressure-maintained sealed samples and two-dimensional nuclear magnetic resonance technology; 2) classifying lacustrine shale lithology types according to shale organic carbon content and clay content, and analyzing the relationship between resistivity values ​​of different lithologies and free water and bound water porosity; 3) selecting siltstone interlayer samples, and inversely calculating the cementation index and saturation index of the inorganic pore conductive network; 4) establishing a lacustrine shale parallel conductive model, and calibrating rock electrical parameters by lithology; 5) establishing a lithology and lithology discrimination chart, a TOC prediction model, a bound water content prediction model and an effective porosity calculation model, and combining the lacustrine shale parallel conductive model to interpret oil saturation by different lithologies. The present invention provides accurate shale reservoir fluid information and provides a new idea for rock electrical parameter calibration.

The invention discloses a method and a device for testing the starting pressure gradient of weakly cemented argillaceous siltstone. The method comprises the following steps: putting the weakly cemented argillaceous siltstone into a core holder, vacuumizing the core holder and the weakly cemented argillaceous siltstone in the core holder, and saturating formation water; setting initial confining pressure, and pressurizing the core holder for multiple times until no liquid is discharged from the outlet end of the core holder; carrying out displacement tests on the displacement fluid according to the sequentially increasing speed of the pump speed, timing each displacement test, and recording the displacement pressure of the core holder, the confining pressure change and the displacement fluid capacity; converting into variable pressure displacement, performing a displacement test on the change of the core holder according to a displacement pressure regulation and control process, and recording the displacement pressure, the confining pressure change and the displacement fluid capacity of the core holder; sequentially increasing the confining pressure, and repeating the displacement test until no displacement fluid exists at the outlet end of the core holder; the invention designs a method for testing the water phase starting pressure gradient of the sandstone core under the conditions of normal temperature and normal pressure.

The present invention discloses a method for determining the sealing thickness of a complex lithologic layer based on temperature-stress field simulation, comprising: determining the vertical superposition relationship and the total thickness of the siltstone layer and the mud shale layer according to the vertical distribution characteristics of the lithologic properties of the overlying strata within a set range; obtaining the respective formulas for preparing siltstone and mud shale through experimental fitting; preparing a top plate rock sample by integral molding; arranging multiple groups of temperature sensors and strain sensors on the side of the rock sample at set intervals; heating the rock sample to a set bottom temperature, applying stress to the bottom of the rock sample step by step from small to large to a set stress, and stabilizing at the temperature and stress until the sensor measurement values ​​stabilize; determining the lower limit of the top plate sealing thickness according to the measurement values ​​of each sensor and the vertical superposition relationship; and similarly determining the lower limit of the bottom plate sealing thickness. This method can reasonably quantify the lower limit of the top and bottom plate sealing thickness of a complex lithologic shale reservoir by simplifying the joint simulation of lithologic properties and temperature and stress fields.

The application relates to the technical field of carbon dioxide storage simulation experiments, and discloses a simulation test device and method for monitoring fault activity of carbon dioxide storage, wherein a geological similar body is filled in a test box body, and the geological similar body comprises, from a low layer to a top layer in the test box body, a first fine sandstone layer, a coal layer, a siltstone layer, a conglomerate layer and a second fine sandstone layer; the first fine sandstone layer, the coal layer, the siltstone layer and the conglomerate layer are misaligned and filled in the test box body to form a fault structure; a carbon dioxide injection assembly and a water injection assembly are respectively located outside the test box body, and an output end of the carbon dioxide injection assembly is inserted into a fault position of the siltstone layer; an output end of the water injection assembly is inserted into the conglomerate layer; the application realizes real-time recording and monitoring of the mechanical behavior of a stratum and the change of an environmental thermal state during carbon dioxide injection and storage by using multiple sensors for real-time monitoring.

This invention provides a digging and flushing device for a submerged shaft boring machine. The cutting head is driven to rotate within a housing, using its surface cutting teeth to break up the rock and soil at the bottom and walls of the shaft. A slurry pump is mounted on the housing. By placing a first flushing component at a first predetermined position between the slurry pump inlet and the cutting head, and a second flushing component at a second predetermined position after the cutting head has rotated past the slurry pump inlet, the first flushing component performs high-pressure flushing in the suction chamber area where soil is first generated and most prone to adhesion. This disrupts the adhesive structure of the soil at its source, preventing it from adhering to the cutting head surface and forming mud cakes. Even if a small amount of soil is not flushed away by the first flushing component, the second flushing component performs secondary cleaning within the digging chamber, further reducing the risk of mud cake formation. This dual flushing mechanism significantly improves the adaptability of the cutting head in strata prone to mud cake formation, such as argillaceous clay and silty mudstone. The synergistic effect of both components achieves full-process flushing coverage for each rotation cycle of the cutting head.

The present invention discloses a method for determining the lower limit of the plugging thickness of the siltstone adjacent layer of a shale reservoir, comprising: determining that the fracture pressure of the shale reservoir is less than the minimum starting pressure of the overlying siltstone layer, and performing the following steps: arranging a heating, pressurizing, and stressing device and temperature, pressure, and strain sensors on the bottom surface of a roof rock sample, and arranging multiple groups of pressure and strain sensors on the side at set intervals; heating the bottom of the rock sample to a set temperature using a heating device, pressurizing the bottom to a first set pressure using a pressurizing device, and applying stress to the bottom of the rock sample step by step from small to large to a first set stress using a stressing device, and stabilizing until the measurement values ​​of each sensor are stable, and determining the lowest position where the pressure of the rock sample is not higher than the second set pressure and the strain is not higher than the set strain based on the sensor measurement values; then determining the lower limit of the roof plugging thickness; and similarly determining the lower limit of the bottom plate plugging thickness. This method can reasonably quantify the lower limits of the roof and bottom plate plugging thicknesses through joint simulation of temperature, pressure, and stress fields.

The invention provides a naming method for salt lake mixed rock. The naming method comprises the following steps: carrying out rock division by using terrestrial clastic particles, carbonate particles and miscellaneous bases; using 50% as a boundary to distinguish siltstone and limestone; according to a sedimentary structure, the land-derived debris particle component is divided into a stratified structure, a blocky structure, a deformed structure and a wave-formed staggered bedding, siltstone is taken as a basic name when the land-derived debris particle component is larger than 50%, silty sand is taken as a basic name when the land-derived debris particle component is 25%-50%, and silty sand is taken as a basic name when the land-derived debris particle component is 15%-25%; dividing the lithofacies by taking the component characteristics and sedimentary structure characteristics of the rock as a division basis according to the conditions of the rock core and the slice; salt lake lithofacies are divided into three major classes, namely siltstone facies, granular limestone facies and marlstone facies, and are subdivided into ten lithofacies subclasses. The method provides a standardized new thought for lithofacies division in a salt lake deposition system, a standard reference is provided for lithofacies naming through outcrop observation, and a lithofacies division standard is formulated according to the scheme according to the deposition structure, the component content and the like.

The present invention discloses a microscopic image analysis method for fine-grained sedimentary rocks based on ImageJ, which includes taking pictures of shale thin sections containing siltstone under a polarized light microscope and saving the pictures; decomposing and converting the microscopic images into 8-bit images according to the three primary colors of red, yellow, and blue, respectively adjusting the color thresholds that can reflect the siltstone minerals and organic matter, and converting the 8-bit images into binary images; constructing a two-dimensional coordinate system for the binary images, statistically analyzing the target areas of the siltstone minerals and organic matter in the binary images, and determining the image area ratio occupied by the target areas and the distribution trend of the target areas; the present invention can automatically statistically identify the proportion of coarse-grained minerals and organic matter content in the microscopic images of fine-grained rocks such as shale and siltstone, and can obtain the mineral particle size distribution, average particle size data, image area ratio of the rocks, and the mineral distribution trend of the rocks.

The present invention discloses a method for determining the sealing thickness of a siltstone layer based on temperature-pressure field simulation, comprising: determining that the fracture pressure of a shale reservoir is less than the minimum starting pressure of an overlying siltstone layer, and executing the following steps: wrapping the side of a roof rock sample with a thermally insulating sealing material, arranging a heating and pressurizing device and temperature and pressure sensors on the bottom surface of the rock sample, and arranging multiple pressure sensors on the side of the rock sample at set intervals; heating the rock sample with a heating device to a set bottom temperature, and pressurizing the rock sample with a pressurizing device to a set bottom pressure, stabilizing the temperature and pressure until the measured values ​​of each sensor are stable, determining the lowest position where the rock sample pressure is no higher than a second set pressure based on the measured values ​​of the sensors; determining the lower limit of the roof sealing thickness based on the distance from this position to the bottom surface; and similarly determining the lower limit of the bottom sealing thickness. This method can reasonably quantify the lower limit of the top and bottom plate sealing thickness of a shale reservoir through the combined simulation of the temperature field and the pressure field.

The present invention provides a construction method for exiting and penetrating a weathered siltstone tunnel in a broken shallow buried section. According to the on-site topography and geology, surface steel flower pipes are adopted at the surface position of the tunnel vault in the weak surrounding rock for grouting reinforcement as a whole. At the small pile entrance section, n rows of steel pipes with built-in reinforced steel cages are adopted as an advance pipe rack, which penetrates above the heading face of the large pile exit section and is combined with a double-layer advance small guide pipe as an advance support. The tunnel body adopts a system anchor rod + double-row lock-foot anchor rod to reinforce the steel arch frame to improve the overall stability of the support. When penetrating, the support is closed into a ring in time by using a three-step advance construction to improve the overall force of the support. The technical problem that the weathered siltstone tunnel may have large tunnel settlement or even roof collapse and large safety risks during the penetrating construction in the broken shallow buried section is solved. The method enables the excavation of the broken shallow buried section to be carried out by the drilling and blasting method. Compared with the existing technology that usually adopts the manual combined with mechanical excavation method in the broken shallow buried section of the tunnel, the construction efficiency of the tunnel penetration is improved.

The cofferdam structure comprises a plurality of steel pipe pile implanting holes which are distributed along the periphery of a cofferdam area at intervals, the steel pipe pile implanting holes are filled with clay, steel pipe piles are arranged in the steel pipe pile implanting holes in a penetrating mode, the lower ends of the steel pipe piles are inserted into the clay, and the lower ends of the steel pipe piles are inserted into the clay. The adjacent steel pipe piles are connected together through the steel sheet piles, the interval space between the adjacent steel pipe piles is sealed by the steel sheet piles, the lower ends of the steel sheet piles are nailed in the ground of a cofferdam area, a cofferdam wall is defined by the steel pipe piles and the steel sheet piles, and a plurality of reinforcing hoops distributed in the vertical direction are arranged on the inner surface of the cofferdam wall. And a plurality of horizontal supports for preventing the reinforcing hoop from deforming are arranged in the reinforcing hoop. The utility model aims to provide the cofferdam structure based on the medium-weathered argillaceous siltstone deep and thick pebble covering geology, which can conveniently realize construction in the medium-weathered argillaceous siltstone deep and thick pebble covering geology, and provides a novel cofferdam structure.

The application discloses a method for determining the shale reservoir siltstone adjacent layer plugging thickness based on pressure field simulation, comprising the following steps: if it is judged that the shale reservoir fracture pressure is less than the minimum starting pressure of the overlying siltstone layer, the following steps are executed: preparing a roof rock sample by using the overlying siltstone coring section, wrapping the roof rock sample by using a sealing material, arranging a pressurizing device and a pressure sensor on the bottom surface of the rock sample, and arranging a plurality of pressure sensors on the side surface of the roof rock sample at a set interval; pressurizing the roof rock sample to the bottom to a set pressure by using the pressurizing device, and stabilizing at the pressure until the change amplitude of the measurement values of all the pressure sensors is less than a set threshold value; determining the lowest position of the roof rock sample at which the pressure is not higher than a second set pressure according to the measurement values of the pressure sensors; determining the lower limit of the roof plugging thickness according to the distance from the position to the bottom surface; and determining the lower limit of the floor plugging thickness in the same way. The method can reasonably quantify the lower limit of the roof and floor plugging thickness of the shale reservoir by the method of pressure field simulation.

A shield cutterhead and excavation method suitable for soft and hard composite strata, the cutterhead comprising a shield cutterhead (1), a cross-shaped main cutter beam (2), an auxiliary cutter beam (3), a center tooth cutter (4), a front roller cutter (5), a cutter (6), an edge roller cutter (7), an edge scraper (8), a fixed tooth cutter (9), a foam nozzle (10), a wear detection knife (11) and a wear-resistant steel plate (12) and other components. The cross-shaped main cutter beam is composed of a first cutter beam, a third cutter beam, a fifth cutter beam and a seventh cutter beam, and the auxiliary cutter beam is composed of a second cutter beam, a fourth cutter beam, a sixth cutter beam and an eighth cutter beam. The method comprises determining the starting torque of the roller cutter, selecting and setting the starting torque of the roller cutter for a soft soil stratum, starting a foam system to spray a foam modifier, and the shield machine pushing the excavation face rock and soil body forward. In the present invention, the cutterhead opening rate reaches 43%, which is particularly suitable for excavation in a typical gravel-sand-mud siltstone composite stratum, and reduces the risk of the cutterhead becoming muddy.

The application provides a marine wide-azimuth data deep dessert prediction method, a storage medium and equipment, including the following steps: carrying out nested identification on well logging, identifying a dessert reservoir, and obtaining a well logging elastic threshold value of the dessert reservoir; using marine wide-frequency wide-azimuth seismic data volume to carry out pre-stack inversion, comparing the inversion result with well logging data, and obtaining an elastic parameter volume of the dessert reservoir; and identifying the dessert reservoir according to the elastic parameter threshold value of the dessert reservoir and outputting a result. The application effectively eliminates the interference of mudstone, siltstone and dry layer and the like through the nested identification mode, and the dessert reservoir is identified on the premise, so that the identification accuracy of the dessert reservoir can be improved. The well logging intersection analysis is taken as a benchmark, and the pre-stack inversion of the fine offshore wide-frequency data is taken as a basis, so that the inversion result and well logging error are effectively reduced, and the accuracy of quantitatively explaining the dessert reservoir according to the elastic parameter volume obtained through well analysis is improved.

The invention relates to a tight sandstone lithofacies identification method and device, electronic equipment and a storage medium, and belongs to the technical field of geological prospecting, and the tight sandstone lithofacies identification method comprises the steps: carrying out the identification of a to-be-detected tight sandstone lithofacies based on a pre-established cross plot, and obtaining a first identification result, the first identification result comprises fine sandstone, mudstone sandstone, siltstone and mudstone; based on an electric imaging technology, further dividing an overlapping region of siltstone and mudstone in the first identification result to obtain a second identification result; on the basis of an electric imaging technology, fine sandstones in the first recognition result are further divided, third recognition results are obtained, and the third recognition results comprise low-resistance bulk fine sandstones, parallel / inclined layered fine sandstones, high-resistance bulk fine sandstones and stratified fine sandstones; and based on the first recognition result, the second recognition result and the third recognition result, obtaining a lithofacies recognition result of the to-be-detected compact sandstone. According to the invention, the accuracy of tight sandstone lithofacies identification can be improved.

The invention discloses a method for determining the plugging thickness required by shale reservoir in-situ exploitation, which comprises the following steps: if an adjacent layer of a shale reservoir is a shale layer or a silty rock layer and the minimum starting pressure is greater than the reservoir fracture pressure, preparing a rock sample by using an adjacent layer coring section; if the adjacent layer is the siltstone and shale interbed, preparing a rock sample according to the up-and-down superposition relation of the siltstone rock layer and the shale layer and the total thickness of the siltstone rock layer and the shale layer and the measurement property of the rock sample; heating and pressurizing the rock sample until the end surface is at a first set temperature and a first set pressure, applying stress to the rock sample step by step to the first set stress, stabilizing the temperature, the pressure and the stress until the measured values of the sensors on the side surface are stable, and determining the critical position of the rock sample meeting the requirements of the temperature, the pressure and the stress according to the measured values of the sensors; and taking the distance to the end surface as the lower limit of the adjacent layer plugging thickness. According to the method, the lower limit of the top and bottom plate plugging thickness is reasonably quantified through joint simulation of temperature, pressure and stress fields.