200 results about "Mudrock" patented technology

The present application relates to oil and gas exploration and development technical field, especially to a block stratum pressure prediction system and method based on three-dimensional seismic information, comprising a data acquisition module, a depth domain conversion module, a three-dimensional gridding work area modeling module, a dynamic lithology volume generation module, a sparse survey line compaction modeling module, a three-dimensional pressure field calculation module and a dynamic regulation and control module. The three-dimensional grid model with well location markers is constructed to realize full space coverage and eliminate the limitations of two-dimensional data. The sparse survey line strategy controlled by structural features is used to process pure mudstone node data, which significantly reduces the calculation load. Based on the dynamic lithology probability threshold, reliable data sources are screened, and the lithology correction coefficient of sandstone area is combined to improve the pressure prediction accuracy. The real-time drilling DC index is used to close-loop verify the prediction results and trigger the regulation and control instructions. The present application effectively solves the technical bottlenecks of insufficient spatial coverage, low calculation efficiency and large prediction deviation in complex geological structure area.

The invention relates to the technical field of petroleum geophysical exploration, and provides a reservoir forming period hydrocarbon source rock paleo-pressure quantitative prediction method and system, and the method comprises the steps: solving the stratum denudation thickness based on a mudstone compaction curve extrapolation method; obtaining the thickness of a terrain skeleton, constructing a binary function based on the stratum denudation thickness and the thickness of the terrain skeleton to analyze an approximate solution, and inverting the stratum paleo-burial depth for the logging paleo-burial depth; obtaining the total porosity of the hydrocarbon source rock according to the stratum paleo-burial depth; quantitatively predicting the single well paleo pressure of the hydrocarbon source rock according to the total porosity; the multi-well paleo pressure is obtained based on the single well paleo pressure, interpolation is performed according to the multi-well paleo pressure to obtain the plane paleo pressure, in this way, the accurate well logging compaction trend line is established, the accuracy and reliability of the prediction result are improved by considering the influence of the shear wave speed, and therefore the accuracy of predicting the paleo pressure of the hydrocarbon source rock in the reservoir forming period is improved.

The present application relates to the field of slurry shield construction, and particularly to a test device and a test method for simulating slurry shield face disaster in composite stratum, comprising a model box, a shield system, a slurry generating system and a monitoring system; the present application discloses a test device for simulating slurry shield face disaster in composite stratum; the test device disclosed by the present application can be applied to round gravel-mudstone composite stratum; meanwhile, the present application adopts fluctuation type slurry pressure to supply slurry to the slurry bin; the actual working condition of the slurry shield can be better simulated, so that the test device disclosed by the present application can be used to reveal the passive failure mechanism of the round gravel-mudstone composite stratum slurry shield face, and provide technical support for the slurry burst early warning; meanwhile, the test device can provide indoor test ideas for the failure process of the shield face in similar binary composite stratum.

The invention discloses a loess-mudstone landslide sliding grading displacement measurement method and system, and the method comprises the following steps: collecting the multi-point displacement data of a landslide body, and carrying out the preprocessing of the data, and generating a standardized multi-measurement-point displacement data sequence; obtaining overall and local deformation states; extracting evolution trend, space consistency and sliding loss features to form a displacement feature set; inputting an improved continuous time hidden Markov landslide state model, and generating a sliding state evolution sequence; analyzing the evolution sequence to generate a grading judgment result; an included angle threshold method and a shear displacement gradient method are adopted to recognize a concave-convex body and a sliding belt, and a key area identification result is generated; and outputting a sliding grading judgment result, a displacement feature set and a key area identification result. According to the invention, fine grading identification of the landslide state and accurate locking of the key area are realized, and the accuracy and foresight of monitoring and early warning are improved.

The invention relates to a quantitative evaluation method and system for premature senility fracture opening capability, and belongs to the technical field of oil-gas exploration, and the method comprises the steps: obtaining fracture related parameters in a research area; the fracture surface positive pressure in the fracture reservoir forming period is calculated according to the fracture related parameters; calculating the plastic deformation ultimate pressure of the fractured mudstone according to the fracture related parameters; according to the section positive pressure and the mudstone plastic deformation ultimate pressure, the opening capacity index of the fracture reservoir forming period is calculated; and dividing fracture opening capability evaluation grades according to the fracture reservoir forming period opening capability index so as to evaluate the premature senility fracture opening capability. According to the method, by calculating the section positive pressure and the mudstone plastic deformation ultimate pressure, quantitative calculation of the opening capacity index is achieved, the fault conduction opening capacity is converted from traditional experience-dependent interpretation into a computable, sortable and comparable quantitative index, and objectivity and consistency of evaluation results are improved.

The application discloses a sparse well area hydrocarbon source rock TOC prediction method and system, an electronic device and a medium, relates to the technical field of hydrocarbon source rock carbon content prediction, and comprises the following steps: establishing a virtual well in a well-free area; determining the seismic attribute of the virtual well based on a seismic attribute extraction method; determining the lithology of the virtual well based on the seismic attribute of the virtual well and a sandstone and mudstone lithology prediction model, and extracting the mudstone section of the virtual well; determining the longitudinal continuous TOC prediction value of the hydrocarbon source rock in the mudstone section of the virtual well based on a single-well longitudinal continuous TOC prediction model; and combining the longitudinal continuous TOC prediction value and the measured TOC value of the hydrocarbon source rock in the mudstone section of the virtual well to construct a three-dimensional TOC attribute body of the target sparse well area based on a preset geological condition constraint, so as to predict the TOC of the hydrocarbon source rock in the target sparse well area. The application realizes higher-precision quantitative evaluation and prediction of the TOC of the hydrocarbon source rock in the sparse well area.

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.

This invention discloses a method and system for predicting reservoir types, comprising: obtaining a cross-interpretation chart of sandstone and mudstone transverse and longitudinal wave impedances based on the lithological distribution information, P-wave impedance curves, and S-wave impedance curves of the target layer in the target well; constructing new elastic impedance curves for distinguishing sandstone and mudstone based on P-wave and S-wave characteristics using principal component analysis based on the sandstone and mudstone transverse and longitudinal wave impedances in the cross-interpretation chart; constructing a new three-dimensional elastic impedance data volume based on the new elastic impedance curves and the three-dimensional inversion data volume of transverse and longitudinal wave impedances; and predicting the reservoir type of the entire well section of the target well based on the new three-dimensional inversion data volume of elastic impedances. This invention can construct elastic impedance attributes more suitable for reservoir identification based on transverse and longitudinal wave impedances, and can realize reservoir interpretation using a single parameter, overcoming the problem of low sandstone identification accuracy under impedance overlap, and improving the accuracy and efficiency of sandstone reservoir identification.

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 application discloses a drilling cementing wall stabilizing agent and a preparation method and application process thereof, and belongs to the technical field of oil field chemistry, and particularly relates to a preparation of the drilling cementing wall stabilizing agent. The preparation method of the drilling cementing wall stabilizing agent can be that thermoplastic resin, a curing agent and inorganic powder are uniformly mixed and stirred at normal temperature and normal pressure according to proportions. The wall stabilizing agent material has the advantages of simple production process, safety, low material cost and convenience for large-scale production and application. The product can not only plug pores and reduce filtration loss, but also cement sand and mudstone strata and improve stratum pressure-bearing capacity, so that the purpose of stabilizing a well wall is achieved. The application further provides an application process of the drilling cementing wall stabilizing agent, which comprises a suitable drilling fluid system and an adding amount and construction process under different stratum porosities and different working conditions.

The invention relates to the technical field of roadbed construction, in particular to a cleaning and finishing method for a red-layer mudstone roadbed bridge abutment transition section base, which comprises the following steps: S1, cleaning the surface of a foundation bed; s2, surveying and setting out; s3, layered excavation is conducted on the transition section, excavation is conducted to the unweathered rock layer face base, and a plurality of steps from the bridge abutment to the foundation bed are formed; s4, step finishing is conducted, specifically, concrete materials are adopted for finishing each step; and S5, performing layered backfilling. The steps are formed through excavation after the surface layer of the foundation bed in the transition section is cleaned, concrete material finishing is conducted on each step, it can be ensured that the structure of the area where each step is located is stable, the bearing capacity meets the design requirement, overall improvement of the stability of a base in the transition section is achieved, meanwhile, the lower steps play a role in stabilizing the upper steps along the slope face of the transition section, and the stability of the base is improved. A stable slope surface is formed in the transition section, landslide settlement is not prone to occurring in the operation period, an abutment is not prone to being affected, the overall stability of a roadbed is ensured, and the settlement occurrence probability is reduced.

The invention discloses a method and equipment for determining the initial reservoir forming depth of shale oil, and the method comprises the steps: obtaining curves of oil-generating pressurization values of mudstone and carbonate rock along with time through an oil-generating pressurization experiment, then carrying out curve conversion, and calculating the initial reservoir forming depth of shale oil by calculating the capillary resistance of the carbonate rock. According to the method, the reservoir forming initial depth of the shale oil is determined according to the superposition curve and the capillary resistance, and due to the fact that the reservoir forming initial depth is determined through the superposition curve and the capillary resistance, the scheme does not need to emphasize on utilization of geological factors and is not affected by other factors, and the finally obtained result is more accurate. Moreover, the method provided by the invention considers the influence of mudstone and carbonate rock on the reservoir forming initial depth of shale oil at the same time, avoids the problem that only conventional oil and gas of single hydrocarbon source rock lithology are aimed in related technologies, and is suitable for determining the reservoir forming initial depth of unconventional oil and gas such as shale oil and the like.

The invention discloses a natural potential curve mudstone baseline construction method, relates to the technical field of logging evaluation, and solves the problems of low interpretation precision and low efficiency of an existing natural potential mudstone baseline construction method. The method comprises the following steps: S1, firstly, carrying out one-dimensional continuous wavelet transformation on a natural potential logging curve by taking a Gaussian first-order derivative as a base wavelet by adopting a one-dimensional wavelet continuous transformation algorithm; s2, designing a one-dimensional continuous wavelet transform algorithm; s3, based on the design of a one-dimensional continuous wavelet transform algorithm, identifying the waveform form; and S4, based on the identified waveform form, connecting a mudstone baseline, and constructing a natural potential curve mudstone baseline. According to the natural potential curve mudstone baseline construction method, automatic construction of the natural potential mudstone baseline is achieved, multiple wells can be continuously processed, the method is higher in adaptability and high in interpretation precision, the method can be applied to encryption adjustment well interpretation, and a foundation is laid for reasonable application of the natural potential curve and stratum interpretation.

The present application belongs to the technical field of oil exploration, and discloses a method for evaluating the development degree of sand-mudstone reservoir-cap assemblage, which specifically comprises the following steps: conducting regional data analysis for a study area, and mastering the core / cuttings data, logging data and oil testing and production testing data of drilled wells, as well as the seismic data and seismic interpretation horizon data of the whole work area; conducting pre-stack deterministic inversion based on Zeoppritz equation to obtain the data body of the ratio of P-wave velocity to S-wave velocity in the work area; extracting the numerical value of the ratio of P-wave velocity to S-wave velocity along the sandstone layer interpreted by the seismic data to obtain the plan view of the sandstone reservoir; extracting the numerical value of the ratio of P-wave velocity to S-wave velocity along the mudstone layer interpreted by the seismic data to obtain the plan view of the mudstone cap rock; quantifying the relative development degree of the reservoir-cap assemblage by a development degree index calculation formula, constructing the plan view of the development degree index of the sand-mudstone reservoir-cap assemblage, and quantitatively dividing the development degree of the reservoir-cap assemblage. The present application can clearly define the development range of high-quality reservoir-cap assemblage, delineate the favorable exploration area, and further guide the well site deployment of exploration wells.

The invention discloses a dolomitic mudstone reservoir fluid property determination method, device and equipment and a medium, and is applied to the field of exploration. The dolomitic mudstone reservoir fluid property determination method provided by the invention comprises the following steps: performing resistivity detection on a to-be-detected dolomitic mudstone reservoir to obtain a resistivity data set; determining a resistivity abnormal value according to the resistivity data set; determining a resistivity median according to the resistivity data set and the resistivity abnormal value; determining a reservoir space evaluation factor according to the resistivity median and the resistivity characteristic value; and comprehensively analyzing the reservoir space evaluation factor, the resistivity median and the resistivity characteristic value to determine the fluid property of the dolomitic mudstone reservoir to be detected. According to the method, the fluid property of the dolomitic mudstone reservoir to be tested is obtained by comprehensively analyzing and judging three groups of data including the obtained reservoir space evaluation factor, the resistivity median and the resistivity characteristic value, the problem that the fracture-cavity reservoir cannot be accurately evaluated by conventional logging information is solved, and effective and accurate evaluation of the reservoir space is realized.

The application discloses a kind of applied loess-mudstone landslide sliding grading displacement measurement method and system, including the following steps: collecting landslide body multi-point displacement data, pre-processing generates standardization multi-measurement point displacement data sequence;Obtain overall and local deformation state;Extract evolution trend, spatial consistency and sliding loss characteristics, form displacement feature set;Input improved continuous time hidden Markov landslide state model, generate sliding state evolution sequence;Analysis evolution sequence generates grading determination result;Adopt angle threshold method and shear displacement gradient method to identify concave-convex body and sliding zone, generate key area identification result;Output sliding grading determination result, displacement feature set and key area identification result.The application realizes landslide state fine grading identification and key area accurate locking, improves the accuracy and foresight of monitoring and early warning.

The invention belongs to the technical field of drilling and completion fluids, and particularly relates to an environment-friendly drilling fluid suitable for marine mud shale formations and a preparation method and application thereof, the environment-friendly drilling fluid comprises 1.0%-3.0% of an aluminum-based blocking agent, 1.0%-2.0% of an amino inhibitor, 1.0%-3.0% of a polymeric alcohol anti-collapse agent, 0.5%-1.0% of a polyether anti-balling agent, 1.0%-3.0% of a filtrate reducer, 0.5%-1.5% of a tackifier, 1.0%-5.0% of a lubricant, 0.2%-1.5% of a pH regulator, and the balance of water. The drilling fluid system does not contain inorganic salt, sulfonated materials and caustic soda, has the advantages of being environmentally friendly, capable of blocking stratum cracks in a self-adaptive mode, capable of strongly inhibiting clay hydration, good in treating agent compatibility and the like, and is particularly suitable for drilling operation of hard and brittle mud shale stratums, broken mud shale stratums or seriously-slurrying stratums or mudstone and sandstone weakly-cemented stratums and the like.

The present application belongs to the technical field of oil and gas exploration, and particularly relates to a kind of exploration method of restricted tidal flat facies carbonate rock gas reservoir. Based on rock, logging data, seismic data, experimental test analysis data, through microfabric analysis, macro and micro combination approach, through rock fabric and mineral identification, restricted tidal flat facies rock development characteristics and regional scope are identified and defined; wherein the rock samples include pore development samples and samples with lithology of dark mudstone and argillaceous carbonate rock; frequency spectrum analysis method, weighted average method, organic matter mass balance method and coherent technology method are used to construct high-frequency sequence lithology-electricity interpretation model and multi-scale through-source fault transport pattern; thus, restricted tidal flat facies carbonate rock gas reservoir accumulation mode is obtained to explore restricted tidal flat facies carbonate rock gas reservoir. The present application innovatively explores restricted tidal flat facies carbonate rock gas reservoir, and solves the technical problems of identification and fine description of this type of gas reservoir.

The present application belongs to the field of seismic data processing, and relates to a thin sandstone reservoir prediction method and system based on prestack phase gradient attributes, comprising: S1: obtaining original seismic data, and preprocessing the original seismic data to obtain preprocessed seismic data; S2: processing the preprocessed seismic data using complex seismic trace analysis to calculate the total phase sequence of each seismic trace; S3: constructing a sandstone-mudstone thin interbedded geological model to simulate multiple configurations and obtain the characteristic law of prestack phase gradient attributes; S4: identifying the thin sandstone reservoir based on the total phase sequence and the characteristic law of prestack phase gradient attributes, realizing fluid prediction, and obtaining a prediction result; and S5: predicting the thickness of the thin sandstone reservoir through the characteristics of the prestack phase gradient attributes in the high-velocity-difference area; avoiding the thin-layer phase interference effect that cannot be solved by traditional AVO, so as to realize the purpose of super-resolution prediction of gas-containing thin sandstone.

The invention discloses a mudstone interlayer high-pressure grouting test device and a grouting diffusion and reinforcement mechanism test method, the device comprises a constant-speed constant-pressure injection pump, an intermediate container, a constant-temperature injection cabin and a data acquisition system, and the inlet end of the constant-speed constant-pressure injection pump is connected with an injection pressure sensor; the intermediate container comprises a fluid container and a slurry container, an inlet end of the constant-temperature injection cabin is connected with an inlet pressure sensor, a cavity of the constant-temperature injection cabin is used for placing a mudstone sample, and a heating and temperature control unit is arranged; the two ends of the mudstone sample are connected with the micro-seismic monitoring device, and the micro-seismic monitoring device comprises at least one group of micro-seismic sensors. The device can accurately control the rate and pressure of grouting fluid, capture microseismic signals during slurry diffusion or crack expansion in real time through the microseismic monitoring sensor, and can quantitatively analyze high-pressure grouting diffusion and reinforcement mechanisms in combination with chemical reaction analysis and microscopic observation, so that the research precision and reliability are improved, and the research cost is reduced. And a method reference is provided for research of similar geological engineering problems.

The invention provides an offshore bottom water thin mutual reservoir fracturing parameter design method, and relates to the technical field of oil and gas exploitation, the method comprises the following steps: S1, determining vertical distribution of a reservoir section mud layer, a sandstone layer and a water layer according to logging data, and establishing a target well section crustal stress and rock mechanics profile; s2, acquiring the fracture toughness of rocks with different shale contents under different stresses to obtain a corrected fracture toughness profile; s3, according to the fracture half length, the fracturing displacement, the critical mudstone layer penetrating thickness corresponding to the fracturing fluid viscosity and the penetrating layer fracture height of the reservoir are initially calculated, and parameters needed for avoiding a water layer and fully transforming a thin interbed are obtained; s4, according to the fracture flow conductivity, the sand amount and the sand-carrying fluid amount are calculated initially; s5, the liquid efficiency is determined according to block fracturing historical data, the prepad fluid proportion range is initially calculated, and the prepad fluid amount is calculated; and S6, optimizing parameters through numerical simulation, and determining final fracturing parameters and a pump injection program. According to the method, the requirements of geological and offshore construction can be met, and the optimal fracturing scheme and the optimal pumping program can be rapidly determined.

This invention relates to the field of oil and gas geological exploration technology, and particularly to a method and apparatus for predicting thin interbedded mud-sand reservoirs based on pre-stack waveform indication inversion. The method includes: processing pre-stack CRP gathers to obtain corner gather data; performing AVO attribute analysis on the corner gathers; stacking them at different angles to generate an offset stacked data volume; obtaining shear wave curves for all wells in the work area based on logging curves and geological parameters; determining rock elastic parameters that reflect reservoir and fluid characteristics based on these curves; establishing a rock physical quantity scale and selecting sensitive parameters that can distinguish between sandstone and mudstone and fluids; setting key inversion parameters; performing inversion on the offset stacked data volume based on the sensitive parameters and key inversion parameters; and predicting thin interbedded mud-sand reservoirs based on the obtained inversion results. This invention achieves high-precision inversion results, effectively improving the accurate prediction of thin interbedded layers, meeting the well accuracy requirements for development, and providing support for the efficient development of tight oil and gas.

The application provides a kind of small well spacing double well salt cavern gas storage stability evaluation method, and relates to underground engineering technical field.The method technical scheme: first, the geological structure characteristics of the rock layer where the gas storage is located are determined by using three-dimensional seismic exploration technology, then the three-dimensional shape measurement of the first well and the second well salt cavity of the gas storage is carried out by using the sonar instrument, and the three-dimensional image and volume of the salt cavity are synthesized.After that, data wells are drilled in the gas storage construction block, the data well cores are extracted for testing, the physical and mechanical parameters of salt rock, mudstone and interlayer in the core are obtained, and the geomechanical numerical model of the salt cavity of the gas storage is established and simulated.Finally, according to the shear dilatancy safety factor, the maximum deformation of the cavity top, the volume shrinkage rate and the critical safety value of the plastic zone, the stability of the gas storage is evaluated, and the well spacing is optimized according to the result.The application has strong operability and can be used to optimize the double well spacing to improve the stability of the small well spacing double well salt cavern gas storage.

The invention relates to the technical field of oil and gas exploration, in particular to a gas logging-based test layer selection method and device.The gas logging-based test layer selection method comprises the following steps that S1, gas logging parameters and logging parameters are collected, and the C1 / C2 ratio is calculated according to the gas logging parameters; drawing a C1 / C2 change curve, an acoustic curve and a total hydrocarbon curve; s2, selecting a hydrocarbon source rock baseline according to a total hydrocarbon curve change trend, lithology and an acoustic curve; s3, comparing the C1 / C2 ratio of the gas reservoir section with the hydrocarbon source rock baseline value of the underlying mudstone section, and dividing the gas reservoir section into a good gas reservoir, a medium gas reservoir and a differential gas reservoir; preferentially selecting a good gas layer, secondly selecting a medium gas layer, and finally selecting a differential gas layer for testing. The method can significantly improve the success rate of test layer selection.

The invention belongs to the technical field of sandstone type uranium ore geological drilling, and particularly relates to a compact mudstone stratum coring bit suitable for sandstone type uranium ore geological drilling. According to the drill bit, the inner cutting teeth and the outer cutting teeth are arranged in a staggered mode, the top ends of the inner cutting teeth and the outer cutting teeth are located at different heights and are arranged in a stepped mode, so that in the rotating process of the drill bit, the high-position cutting teeth firstly make contact with a stratum for cutting to form a broken free face, and the low-position cutting teeth further cut to expand the formed cutting free face; a stratum cutting free surface is enlarged compared with a drill bit in the prior art, so that the effect of improving the drilling efficiency is achieved. In addition, the water gaps are evenly distributed close to the cutting teeth, and cut rock debris is removed in time.

The invention provides a lithology identification method based on conventional logging information. The lithology identification method comprises the following steps: S1, acquiring an interval transit time AC curve, a stratum density DEN curve and a natural gamma GR curve in a conventional logging sequence of a target well; s2, a wave impedance IMP curve is obtained through calculation by means of the interval transit time AC curve and the stratum density DEN curve; s3, generating a combined curve of wave impedance IMP and natural gamma GR; s4, based on a preset lithology discrimination standard, performing quantitative lithology identification according to the combined curve to obtain a quantitative lithology identification result; and S5, generating a lithologic section of the target well according to a lithologic quantitative identification result. The method is easy to operate, data are easy to obtain, the lithology of sandstone, mudstone and volcanic rock can be rapidly and accurately recognized, feasibility and credibility are high, and a scientific lithology recognition means is provided for exploration and development technicians.

This invention discloses a method and system for calculating the permeability of heterogeneous sandstone and mudstone reservoirs. Based on limited well information data from oilfield development wells, the spontaneous potential and natural gamma logging curves are first standardized and then normalized. The envelope area between the two is then calculated. Finally, a permeability logging interpretation model is established using a mathematical fitting method, combined with core analysis permeability, thereby enabling rapid quantitative calculation of permeability in predicted wells at continuous depths. This method is simple, universally applicable, and highly accurate, meeting the needs of oilfield production. It is operable by general interpreters and facilitates rapid large-scale application in production. Furthermore, it provides support for fluid identification and optimization of fracturing operations based on accurate permeability calculations.

The application relates to a water-controlled type fixed-point solidification composite material for deep mudstone reinforcement and a preparation method and application thereof. The method comprises the following steps: dissolving nano-SiO2 and a KH-792 silane coupling agent in deionized water to form a nano-SiO2 dispersion liquid, and then adding PVA-F-glutaraldehyde double-capsule-core microcapsules, modified water-absorbing and swelling particles SAP and silico-aluminate powder in sequence to prepare a grouting liquid with a time-delay solidification function. After the material is injected into deep mudstone cracks, the SAP rapidly swells by absorbing pore water, the grouting liquid is retained in the micro-cracks and forms fixed-point enrichment, then glutaraldehyde in the microcapsules is released under the action of the pore water, cross-linking with PVA-F and nano-SiO2 to form a three-dimensional gel network, and finally a high-strength reinforced body is formed. The material has the characteristics of good fluidity, controllable solidification time, strong crack adaptability and high solidification strength, and is suitable for the fields of deep coal and rock roadway soft mudstone support, geological disaster crack grouting repair and the like.

This invention relates to a method for identifying and predicting the thickness of highly-to-overmature marine source rocks, determining the lower limit of total organic carbon (TOC) content; using this lower limit as a boundary, clarifying the electrical distribution characteristics of carbonate mudstones with TOC content greater than the lower limit, mudstones with TOC content greater than the lower limit, and mudstones with TOC content less than the lower limit; and then constructing a well logging quantitative identification scale. This allows for the determination of the thickness of carbonate mudstones with TOC content greater than the lower limit. This invention effectively solves the key problem of often missing the distribution intervals of some high TOC samples in the evaluation of the hydrocarbon generation potential of highly-to-overmature marine source rocks.

The present application relates to the field of oil and gas exploration, and provides a few well area multi-depositional facies belt sand shale reservoir prediction method and system, the method comprises the following steps: preprocessing seismic exploration data of the study area, extracting seismic attribute volume combined with depositional facies belt lithology difference, screening the seismic attribute volume through lithology sensitivity analysis to obtain core attribute volume; taking the core attribute volume as a constraint condition, performing primary inversion on the pretreated seismic exploration data through inversion algorithm to obtain primary inversion data volume; constructing pseudo well according to the primary inversion data volume and depositional facies belt characteristics, modeling the pseudo well and well logging data of real drilled well jointly to obtain low frequency model; taking the low frequency model as a constraint condition to perform iterative inversion, predicting sand shale reservoir from the iterative inversion result to obtain full area sand shale reservoir prediction result. The present application improves the adaptability of multi-depositional facies belt.