117 results about "Diagenesis" patented technology

The invention discloses an identification method of the deposition and diagenetic integrated phase of clastic rocks. The method comprises the steps of 1) defining the deposition and diagenetic integrated phase based on a rock core; and 2) identifying the deposition and diagenetic integrated phase by utilizing a logging curve. The invention brings forward the concept of the deposition and diagenetic integrated phase for the first time, and influence of original decomposition and post-stage diagenesis on reservoir physical properties and logging response are taken into consideration; the classification standard of the diagenetic phase in the deposition and diagenetic integrated phase is re-defined, the principle of classifying the diagenetic phase according to the absolute values of compacting, cementing and corroding effects to the reservoir physical properties is provided for the first time, and thus, classification of the diagenetic phase is more accurate; and the logging identification method, in which crossplot identification is carried out on the basis of Bayesian discrimination, of the deposition and diagenetic integrated phase is provided for the first time, and the correct rate of logging identification is obviously improved.

The invention relates to a diagenesis simulation experimental apparatus and method. The diagenesis simulation experimental apparatus comprises a rock core clamping mechanism, a heating mechanism, a gas porosity and permeability measurement process, a liquid injection and liquid permeability test process, an automatic continuous outlet-fluid metering and sampling mechanism, a burden pressure boost control mechanism, a fluid physical property detection mechanism and a data acquisition-calculation and automatic control mechanism, wherein, the inlet and outlet of the rock core clamping mechanism are respectively connected with the gas porosity and permeability measurement process and the liquid injection and liquid permeability test process; the heating mechanism is sheathed at the periphery of the rock core clamping mechanism, and the burden pressure injection port of the rock core clamping mechanism is connected with the burden pressure boost control mechanism; the outlet of the liquid injection and liquid permeability test process is connected on the automatic continuous outlet-fluid metering and sampling mechanism; the fluid physical property detection mechanism detects a fluid sample of the automatic continuous outlet-fluid metering and sampling mechanism; and the data acquisition-calculation and automatic control mechanism acquires, records, stores and calculates temperature, pressure and flow rate in an experiment and meanwhile controls operation of the corresponding solenoid valve and the automatic continuous outlet-fluid metering and sampling mechanism according to the experimental status.

The embodiment of the invention provides a diagenesis simulation experiment device, which contains a control device, a reaction solution supply device, a multistage continuous flow reaction device, a solution composition in situ analysis device and a core permeability evolution online detection device. The control device is respectively connected with the reaction solution supply device, the multistage continuous flow reaction device and the core permeability evolution online detection device. The reaction solution supply device is respectively connected with the multistage continuous flow reaction device and the core permeability evolution online detection device. The multistage continuous flow reaction device is connected with the solution composition in situ analysis device. The core permeability evolution online detection device is respectively connected with the multistage continuous flow reaction device and the reaction solution supply device. The diagenesis simulation experiment device provided by the invention can be used to finish more than two stages of water-rock reaction processes at different temperatures and pressures and under the condition of maintaining continuous flow of a fluid and realize continuous multistage water-rock reaction experimental simulation.

The invention discloses a volcanic zone fault sealing comprehensive evaluation method specifically based on Karamay oilfield volcanic rock development area. A volcanic zone fault sealing forming mechanism is mainly lithologic opposition and diagenesis. A lithologic opposition characteristic can be reflected in the aspect of the difference between the density of rock stratums on both sides. The diagenesis of a fault zone is affected by cross section pressure, closeness and the like. Through the filling of argillaceous debris and the injection of late fluid, the fault zone is strongly closed. According to the invention, a concept model of fault plane density difference is established; a variety of parameters (cross section normal stress, closeness index and the like) are combined to evaluate diagenesis closeness and docking closeness; closeness influence factors are induced; a weight factor is proposed; through a weight coefficient, a mathematical model is built to acquire a comprehensive factor; and the fault sealing is comprehensively evaluated. According to the invention, a variety of geological factors are considered; accurate requirements of fault sealing quantitative evaluation can be met; and the method can be widely applied to the field of oil and gas resource geological exploration and development evaluation.

The invention relates to a method for representation and factor recognition of common carbonate rock diagenesis fabric features. The method includes the following steps that rock cores are observed, sampled and flaked; the diagenesis fabric types and periods of samples are determined under a microscope, and a petrology chart is formed; single-period diagenesis fabric is sampled or flakes are ground; multiple kinds of geochemical analysis is conducted on the diagenesis fabric, and then geochemical data are generated; the geochemical data are collected, a chart is drawn according to the data, and a geochemical chart is formed; based on the geological backgrounds of the samples, the petrology chart and the geochemical chart of the samples are comprehensively analyzed, and then the factors of the samples are reasonably explained. According to the method, the single-period diagenesis fabric serves as an experimental analysis unit, multiple kinds of experimental analysis is conducted on the single-period diagenesis fabric, and the method has the advantages that blindness of traditional total rock analysis is avoided, the purpose that carbonate rock diagenesis is objectively represented is achieved, and the result obtained based on petrology data and multiple geochemical data is more reliable.

The invention provides a method and system for simulating and analyzing a shale reservoir diagenetic evolution process. A diagenesis simulation system is utilized to carry out simulation and analyzing of shale evolution, and under simulation of compaction approaching to actual geological conditions, shale reservoir diagenetic evolution stage division, brittle mineral content variation and the forming temperature and pressure of authigenic mineral are determined.

A method for quantitative determination of the permeability and porosity evolution of a porous medium during diagenesis having application to oil reservoir development is disclosed. A diagenesis scenario and an initial structure of the pore network of the porous medium are defined.

A representation of the pore network is constructed by a PNM model. The steps of the diagenesis scenario are determining the ion concentration on the pore and channel walls of the PNM model, for a precipitation or dissolution reaction according to the scenario, and deducing therefrom a geometry variation of the PNM model, the porosity is calculated geometrically and the permeability is calculated from Darcy's law for the modified PNM model; the foregoing steps are repeated according to the diagenesis scenario and a relationship is deduced between the permeability of the porous medium and the porosity of the porous medium during diagenesis.

The invention discloses a tight sandstone porosity and permeability prediction method based on reservoir quality main control factor analysis. The method comprises the following steps: 1) performing quantitative diagenesis evaluation; 2) selecting diagenesis factor reflection; 3) selecting multivariate linear stepwise regression as a data analysis method, and realizing porosity and permeability prediction through reservoir quality development main control factor analysis; and 4) performing regression analysis on the porosity and permeability according to a regression analysis method. According to the prediction method disclosed by the invention, the reservoir quality influencing factors of 8 sections of sandstone in the east region of the Sulige gas field are clear, a reservoir quality prediction model is established, and the prediction effect is excellent; and moreover, a novel thought and method can be provided for tight sandstone reservoir quality quantitative prediction in other regions.

The invention provides an evaluating method for compressibility of a shale reservoir. The evaluating method comprises the following steps that standardized treatment is conducted on the parameter values of the five factors with different units and different dimensions influencing the compressibility of the shale reservoir by adopting range transformation or empirical assignment to obtain standardized values, wherein the five factors comprise the brittleness index, the brittle mineral content, the natural weak surface, the ground stress difference coefficient and the rock formation effect, theinfluencing weight of the five factors on the compressibility of the shale reservoir is determined by adopting an analytic hierarchy process to obtain the weight coefficient, weighting processing is conducted on the obtained standardized values and the weight coefficient to obtain the compressibility coefficient of the shale reservoir, and evaluating is conducted on the compressibility of the shale reservoir by using the obtained compressibility coefficient. By means of the evaluating method, whether the shale reservoir can be pressurized can be evaluated quantitatively, and an idea and methodare provided for the quantitative evaluation of the compressibility.

The invention discloses a method for classifying bioclastic limestone reservoir pore structures. The method comprises the steps as follows: a, nuclear magnetic logging, conventional logging and drilling coring are performed on a target well section in a researched block; b, matched high-pressure mercury injection and nuclear magnetic resonance experiments are performed on a core; c, the pore structures are classified into four types according to the capillary pressure curve shape, the pore throat distribution feature and oil-gas production capacity, and pore throat space bounds at different scales are determined; d, relaxation distribution ranges of different pore components of a nuclear magnetic resonance T2 spectrum are acquired according to the scales of the core; e, the classification standard of the pore structures is established according to the distribution condition of different pore components of the nuclear magnetic resonance T2 spectrum; f, the types of the continuous pore structures of the whole well section are recognized according to the nuclear magnetic logging information. The relation between mercury injection capillary pressure curve fractal features and diagenesis and pore throat distribution is fully mined, the ratio of different pore components is obtained in combination with nuclear magnetic information, the reservoir pore structures are classified more elaborately, and the problem about fine evaluation of the heterogeneous bioclastic limestone reservoir pore structures is solved.

The invention discloses a rock core preparation method. The rock core preparation method comprises the following steps: putting a diagenesis raw material and nanoporous filler into a diagenesis mold, so as to prepare a nanoporous artificial rock core green body; putting the nanoporous artificial rock core green body into a diagenesis environment, and carrying out diagenesis, so as to obtain a primary nanoporous artificial rock core; and carrying out demolding processing on the primary nanoporous artificial rock core, so as to obtain a nanoporous artificial rock core. The artificial rock core prepared by virtue of the rock core preparation method has nano-scale pores.

The invention discloses an evaluation method based on effectiveness of a shale reservoir. The method comprises: determining the lithofacies as a basic evaluation unit according to the characteristics of the shale oil reservoir; selecting the oil production property, the storage property, the modifiability and the flowability as evaluation contents; and further performing influence factor analysis by the system, preferably selecting organic carbon content, hydrocarbon generation potential, crack type and development strength, pore type and surface porosity, diagenetic action, relative brittleness coefficient, brittleness index and critical flow aperture as evaluation parameters, and obtaining the shale reservoir type by adopting a gray fuzzy mathematical method.

The invention provides a bioclastic limestone reservoir heterogeneity research method. The method specifically comprises the following steps that sedimentary microfacies dividing is performed on a bioclastic limestone reservoir; a pore permeability parameter distribution interval standard of different microfacies is built; a region sedimentary facies map is drawn, and the relation between the productivity and sedimentary microfacies belt distribution state of different well locations is inspected; the corresponding relation between main diagenesis types and lithological characters is built through diagenesis type analysis; pore structure research and reservoir classification are performed, and pore diagenetic degree classification grades of different diagenesis types are supplied according to a reservoir classification result; an imitated variable coefficient, an imitated dart coefficient and an imitated range of the bioclastic limestone reservoir are calculated, and numerical intervals of all-grade heterogeneity parameters are supplied. According to the method, the bioclastic limestone reservoir heterogeneity is researched jointly from the macroscopic aspect and microcosmic aspect, and the improvement of the reservoir permeability mechanism knowledge and the guidance of the effective development of oil and gas fields are facilitated.

The invention discloses a method and a device for modeling a reservoir physical property parameter. The method comprises the following steps: firstly, constructing a three-dimensional sedimentary facies model of a reservoir, and establishing a three-dimensional reservoir petrophysical facies model under the restriction of the three-dimensional sedimentary facies model; secondly, establishing a three-dimensional reservoir physical property parameter model under the restriction of the three-dimensional reservoir petrophysical facies model. Compared with the prior art, the method and the device have the advantages that when a reservoir petrophysical property parameter model is constructed, sedimentary facies restriction is considered, and the influence of reservoir petrophysical facies is also considered, so that a modeling result can reflect a combined action of a reservoir sedimentation action, a diagenesis action and a later-stage construction action, thereby improving the modeling accuracy of the reservoir physical property parameter.

The invention discloses a mixed sedimentary rock classification and naming method based on content of three-end-member minerals. The upper limit value of the content of exogenous fragments in mixed sedimentary rock is determined according to effective productivity; according to rock components, a three-end-member classification scheme is determined; naming is conducted, wherein according to the contents of the rock components, basic names are determined, and then cement and special structures or diagenesis serve as modifiers to participate in naming; according to a specific naming rule, the basic names are determined respectively according to the mixed sedimentary rock with different main components, when the content of auxiliary minerals is 25-50%, 'material' serves as the additional modifier, and when the content of the auxiliary minerals is smaller than 25%, 'containing' serves as the additional modifier. In the method, the upper limit value of the content of exogenous fragment particles is determined according to effective productivity, the mixed sedimentary rock is named by means of the three end members including exogenous fragments, endogenous fragments and a carbonate interstitial material, a scientific classification system framework suitable for actual production application is constructed on the basis of taking sedimentary causes into consideration, and basic data can be provided for mixed sedimentary environment analysis.

The invention discloses a preparation method of artificial shale rock cores based on an inorganic glue ratio. The preparation process is simple; inorganic glue is adopted to adjust the strength, the porosity, the permeability, and the homogeneous degree of prepared artificial shale rock cores to be similar to those of natural shale rock cores. According to the preparation method, a mineral raw material powder is mixed with the inorganic glue, and an obtained mixture is subjected to pressing in a rock core diagenesis simulation system so as to obtain artificial rock cores of different componentproperties; and the component properties of the obtained artificial shale rock cores are modified to be close to those of natural rock cores. The prepared artificial shale rock cores are subjected totest analysis so as to obtain related data such as well logging curve, and establish a shale gas reservoir porosity prediction equation, so that it is convenient for guidance of on-site shale gas exploitation.

The invention provides a soft sandstone modified material, and belongs to the field of building materials. The soft sandstone modified material comprises soft sandstone or soft sandstone primary rock, a diagenesis admixture with volcanic ash activity or potential hydraulicity, general purpose Portland cement and water, wherein the mass percent of the diagenesis admixture with volcanic ash activity or potential hydraulicity is 0.5%-60%, the mass percent of the soft sandstone or soft sandstone primary rock is 40%-90%, the mass percent of the general purpose Portland cement is 0.5%-10%, the mass percent of a diagenesis agent is 0.5%-15%, and the mass percent of the water is 5%-20%. The soft sandstone modified material has the advantages of high strength, small air shrinkage deformation, strong water resistance, easiness in obtaining of materials and manufacturing, simplicity and convenience in a construction manner and the like. The compressive strength of the soft sandstone modified material at 90 days can reach 3Mpa-25Mpa, and the soaking softening coefficient of the modified material can be above 0.7.

The present invention provides a diagenetic facies recognition method, the diagenetic facies recognition method comprises obtaining of diagenetic facies characterization parameters, and obtaining of the integrative modulus of diagenesis according to the obtained diagenesis intensity, wherein the obtaining of the diagenetic facies characterization parameters comprises measurement of diagenesis intensity or the diagenesis intensity and diagenetic mineral content; or, the diagenetic facies recognition method comprises obtaining of diagenetic facies characterization parameters, and the obtaining of the diagenetic facies characterization parameters comprises measurement of the diagenetic mineral content. According to the obtained integrative modulus of diagenesis or diagenetic mineral content, a reservoir diagenetic facies type can be recognized, the time-consuming and high-cost technical problems of rock core analysis process in the prior art can be solved, and a quantitative evaluation of reservoir diagenetic facies can be achieved.

The invention relates to a physical experimental apparatus for simulation of mudstone smearing, forming and evolution under the condition of solid and semi-solid diagenesis and the usage of the apparatus. The apparatus comprises a model system and a terminal control system. The model system comprises a hydraulic manual displacement adjusting device, a load-bearing frame, a crane, a load-bearing top beam, a top hydraulic transmission device, a fixed steel plate, a fault slider, a rotary shaft, a rotary bearing, a manual view angle adjusting device, a base, a bottom hydraulic transmission device and a lateral hydraulic pressure control device. The terminal control system comprises a manual pump control device, a pulsation-free pump control device, a displacement sensor, a first pressure cylinder, a third pressure cylinder, a fourth pressure cylinder, pressure gauges of the third and fourth pressure cylinders, a second pressure cylinder and a hydraulic conveying pipeline. The mudstone smearing, forming and evolution process can be well simulated by means of the physical experimental apparatus.

The invention relates to a method for recovering the burial history of a stratum near a normal fault. The method comprises the steps of: S1, performing well-seismic combination for regional stratigraphic division; S2, selecting a virtual well location of a target area and calculating the denudation amount of the virtual well location; S3, calculating the fault activity rate; and S4, recovering theburial history. The invention adopts well-seismic combination to carry out regional stratigraphic division, selects a virtual well location in the vicinity of the fault of the target well location without passing through the zone, uses the "trend analysis method" to calculate the denudation amount of the stratum, then calculates the fault activity rate according to the strata thickness features of the upthrown side and the downsthrown side of the fault, and determines the fault activity period; stratum erosion data, lithology data, geothermal data and geochemical analysis data are combined torecover the burial history of the study area. The invention can accurately recover the burial history and thermal evolution history of the stratum near the fault zone, thereby laying a foundation forreservoir evolution and high-quality reservoir diagenesis research, further determining the distribution of high-quality reservoirs, improving the drilling efficiency in the exploration and development process, and saving production funds.

The invention relates to an establishment method and an application of a carbonate rock reservoir classification plate. The establishment method is characterized by comprising the steps of: 1) establishing a equilateral triangle coordinate graph, wherein a base coordinate axis of the triangle coordinate graph represents a rock type variation, a left side coordinate axis of the triangle coordinate graph represents a sedimentary facies variation, and a right side coordinate axis of the triangle coordinate graph represents a diagenetic type variation; 2) dividing each of the three coordinate axes into n equal parts, wherein each equal part accordingly represents a rock type of shale content, a sedimentary facies of water body energy and a diagenetic type of diagenesis; 3) and drawing n-1 parallel lines which are parallel to the side which represents the diagenetic type variation and the side which represents the sedimentary facies variation on the triangle coordinate graph, so as to divide the triangle coordinate graph into a plurality of subclass reservoirs, wherein physical properties of the carbonate rock reservoirs are sequentially and progressively decreased from the subclass reservoir at the upper part to the subclass reservoir at the lower side of the triangle coordinate graph. The establishment method and the application of the carbonate rock reservoir classification plate can be widely used in the field of oil and gas field exploitation geology.

The invention belongs to the field of geochemistry, and particularly relates to a method for identifying a rebalancing fluid enclosure in a reservoir of a sedimentary basin. The method is simple and clear, and can identify the rebalancing fluid enclosure by only adopting the microphysiography and the homogenization temperature of the fluid enclosure. The rebalancing fluid enclosure can be effectively identified in the sedimentary basin subjected to polyphase geological events, so that mis-explanations that the paleogeotemperature is recovered by adopting data of the rebalancing fluid enclosure and the like are avoided; furthermore, diagenesis and reservoir forming periods can be judged, and the activity intensity of a geological event can be effectively instructed.

The invention discloses a quantitative prediction method for diagenetic simulated porosity of a carbonate reservoir. Based on the research on carbonate reservoir sedimentary facies, diagenetic materials, sedimentary cycle, diagenesis and strata thickness, the method establishes a geological parameter-diagenesis-porosity prediction model so as to laterally predicts the porosity of carbonate reservoir, determine the pore spatial distribution of the carbonate reservoir, and provide a basis for reservoir evaluation. The method fully considers the triggering mechanism of the heterogeneity of the carbonate reservoir, and can have a good predictive effect for the quantitative evaluation of the carbonate reservoir.

The invention relates to a method for quantitatively evaluating the sealing ability re-forming time of cap rocks after fault movement. The cap rocks after fault movement lost self sealing ability, through overburden sediment load compaction, the sealing ability of the cap rocks recovers. According to a fault vertical sealing mechanism, the cap rocks after fault movement can re-form the sealing ability only when displacement pressure of the cap rocks after fault filler compaction is not smaller than displacement pressure of reservior rocks, and sealing ability gradually increases along with increase of a compaction degree of fault rocks. Based on the principle of the method, for a set of determined reservior rocks, required initial displacement pressure of the fault rocks is determined according to the displacement pressure of the reservoir rocks when the cap rocks re-form the sealing ability, burial depths of the fault rocks during formation of the sealing ability and surrounding rocks having the same diagenesis degree as the fault rocks are determined according to relationships between a product of shale content of the fault rocks established in a research zone and compaction diagenetic depth and the displacement pressure, and the sealing ability re-formation time of the cap rocks after fault movement is lastly acquired.

The invention provides a high-temperature high-pressure thermal fluid seepage simulation device. The high-temperature high-pressure thermal fluid seepage simulation device at least comprises a diagenesis reaction control simulation device, a high-temperature high-pressure pump and a thermal fluid circulation unit. The high-temperature high-pressure pump and the thermal fluid circulation unit are communicated with the diagenesis reaction control simulation device. The diagenesis reaction control simulation device comprises a front cavity, a rear cavity and a connection block connected with the front cavity and the rear cavity. A press rod penetrating the connection block is arranged in the connection block. Two ends of the press rod are connected with two pistons respectively. The ends of the front cavity and the rear cavity are sealed by a front press cap and a rear press cap respectively. The diagenesis reaction control simulation device is communicated with the thermal fluid circulation unit through liquid outlet holes and a liquid inlet hole which are formed in the front cavity, and is communicated with the high-temperature high-pressure pump through an oil inlet hole of the rear press cap. Intelligently-controlled thermostatic sleeves sleeve the diagenesis reaction control simulation device and a circulation container of the thermal fluid circulation unit respectively. The high-temperature high-pressure thermal fluid seepage simulation device can simulate high-temperature high-pressure thermal fluid seepage of the stratum physically, can analyze influence degrees of different influence factors on diagenesis time quantitatively and can be used for production of artificial cores.

The invention discloses a phosphogypsum consolidation diagenesis agent and a preparation method and application thereof. The phosphogypsum consolidation diagenesis agent is formed by mixing a powderycuring agent A and a liquid curing agent B in the weight ratio of (9.2-9.99):(0.01-0.8), wherein the powdery curing agent A comprises, by weight, 98-99.9 parts of Portland cement and 0.01-2 parts of alginate, and the liquid curing agent B comprises, by weight, 92-99 parts of nano silicon dioxide solution and 1-8 parts of polyacrylic acid elastic emulsion. The powdery curing agent A in the phosphogypsum consolidation diagenesis agent is alkaline and is subjected to neutralization reaction with acidic phosphogypsum, phosphide and fluoride in phosphogypsum neutralize soluble phosphorus and fluorine and are converted into insoluble calcium phosphate and calcium fluoride substances, and attached water in phosphogypsum is absorbed, so that the water content of phosphogypsum is reduced, and phosphogypsum is solidified. The liquid curing agent B and the hydration product, namely silicate gel in the powdery curing agent A are subjected to colloid chemical reaction under the action of compactionpower to generate a structural body of silicon-oxygen tetrahedron to achieve the consolidation diagenesis function.

The invention provides a compact quartz sandstone porosity recovery simulating method. According to the invention, a compact quartz sandstone porosity compaction model in an early diagenesis phase isestablished; a compact quartz sandstone cementing contraction model is established; a compact quartz sandstone acidification pore retaining model is established; compact quartz sandstone porosity recovery simulation is performed, stage division is performed according to diagenesis, boundary conditions of the compaction model and the cementing model are found, an acidification window is set, petrography data is input and simulation precision and conditions are set for solving; three influence results are obtained through iteration solution and a simulation result is exported, and a compact quartz sandstone porosity evolutionary process is obtained. According to the invention, by adopting a method for calculating the quartz cementing progress to perfrom simulation study on quartz sandstone porosity, real time modification on residual porosity is performed through porosity mathematic models describing a compaction process and an acidification process, and simulation process proceeds segment by segment through fine analysis on diagenetic stages, so that change of porosity in the diagenetic process is described accurately.