1717 results about "Petrology" patented technology

The invention discloses a method for calculating oil saturation of a reservoir. The method comprises the following steps of: establishing a reservoir oil saturation model including a free fluid porosity phi f, a bound fluid porosity phi b, as well as corresponding macropore bond index mf, micropore bond index mb and micropore bond index characteristic value parameters; measuring a core porosity phi of a selected core sample; carrying out a nuclear magnetic resonance T2 spectrum experiment and an electric petrophysical experiment on the selected core sample to determine the core porosity phi and bound water saturation Swir of the selected core sample, the free fluid porosity phi f and bound fluid porosity phi b, stratum water resistivity Rw of a saturated rock sample, saturated water rock resistivity Ro of each rock sample, and resistivity Rt of each rock under different conditions of water saturation Sw; determining parameters of a reservoir oil saturation model by adopting an optimization data fitting method; establishing a relationship between the core micropore bond index mb and the bound water saturation Swir; classifying reservoir cores according to the bound water saturation; and determining a saturation index n of each type of cores by using the optimization fitting algorithm.

The invention relates to a determining method for surveying the reserves of hypotonic clastic rock oil-gas reservoir positioned on a clastic rock oil (gas) geological reservoir enrichment boundary, comprising the following steps of: carrying out statistical regression on the daily produced oil-gas data and water data of the traditional testing oil well and the traditional testing gas well and thecorresponding physical data, oil-bearing data and electrical data of an oil layer to determine the physical lower limit value, the oil-bearing lower limit value and the electrical lower limit value of an oil-gas layer, which correspond to industrial oil-gas flows; determining the minimum values of output and a sand body thickness according to the relationship between an effective thickness and test oil output and between the sand body thickness and test production; determining the area boundary of the oil-gas reservoir by using a sandrock thickness isoline method and an effective thickness isoline method; and calculating the reserves of the hypotonic clastic rock oil-gas reservoir. The invention solves the problem that the oil-bearing area of the traditional hypotonic clastic rock oil (gas) reservoir is extrapolated depending on artificial well points, is convenient to apply in the calculation of the reserves, can not only be used for more accurately calculating the reserves of oil (gas) reservoir, but also furthest save the exploration discovery workload and reduce the discovery cost of ton reserves, thereby enhancing the economic benefits of oil-gas exploration and development.

The invention provides an analog measurement method and a device of oil saturation in strata, which belong to a geophysical exploration testing method and an analog device. The analog measurement method of the oil saturation in the strata comprises the steps of simulating an actual stratum (manufacturing an artificial cemented rock core model), arranging an analog well, arranging an oil-water saturation monitoring system in the artificial cemented rock core model, constructing an electric field at the periphery of the wall of the well, obtaining the oil saturation illustrative charts of different pervious courses by measuring the change of the resistivity of the rock core model and the like. The method not only can well simulate and measure the underground geological condition but also can further learn the position of the residual oil of a reservoir and the change rule of the saturation, thereby learning and determining the oil accumulation reserves and the grade in the simulated stratum.

The invention relates to the technical field of oil fracturing, in particular to a method for calculating the staged fracturing productivity of a compact reservoir horizontal well. The method is characterized by including the steps of firstly, dividing a reservoir infiltration area into four parts; secondly, obtaining the equivalent hole diameter of each fracture; thirdly, obtaining the yield of each fracture during multiple fracture disturbance; fourthly, coupling the yield of each fracture with the hydraulic pressure drop flow model in a horizontal wellbore to obtain a group of bottom hole pressure, iteratively solving until the bottom hole pressure difference of the previous step and the next step is smaller than tolerance, namely convergence, and taking the determined group of yield as the fracture-control yield of each fracture and the sum of the fracture-control yield of the fractures as the total yield of the horizontal well. The method is real and reliable in calculation result and good in application effect.

The invention provides a method and a device for recovering an oil and gas reservoir rock mechanics underground in-situ model. The method comprises the following steps of: measuring rock mechanics parameters of an oil and gas reservoir; counting rock mechanics property influence parameters of the oil and gas reservoir; calculating the anisotropy strength of the rock mechanics parameters; obtaining a correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir; obtaining a correlation between the rock mechanics property influence parameters and the anisotropy strength; and recovering the oil and gas reservoir rock mechanics underground in-situ model by adopting the rock mechanics parameters, the anisotropy strength of the rock mechanics parameters, the correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir and the correlation of the rock mechanics property influence parameters and the anisotropy strength. By the method, the effectiveness and the accuracy for recovering the oil and gas reservoir rock mechanics underground in-situ model can be improved.

The invention relates to an ultra-deep well drilling simulation experiment device which mainly comprises a drilling system, an autoclave system, a rock sample heating and pressurizing system, a detecting system, a data acquiring system (22) and a computer data processing system (21). The drilling system comprises a frame, a power head system, a drilling fluid system and a hydraulic system; the autoclave system mainly comprises a dynamic sealing device (9), a pressure vessel (18), a drilling rod column (19), a bit (23), a hoop (25) and an experiment bench (29); the detecting system mainly comprises a parameter detecting system and a temperature and pressure detecting system; a programmable logic controller (PLC) is connected with the computer data processing system (21); a rock sample is put on the experiment bench (29); a resistance wire is used for heating the rock sample; a rock sample clamping and pressurizing mechanism (24) is used for pressurizing the rock sample; and the drilling system is used for drilling the rock sample. The ultra-deep well drilling simulation experiment device is used under the high-temperature and high-pressure condition.

The invention provides a complicated rock core preparation method based on CT scanning and 3D printing. Based on a combined technology of CT scanning and 3D printing, the reappearance of an underground rock pore structure characteristic is realized, and the visualization of oil-gas-water distribution inside a rock core can be achieved. Through a 3D printing technology, the visualization and actualization of the digital rock core and a network model can be achieved, and the underground core pore structure can reappear in a real object form. More importantly, with the continuous input and development of unconventional oil-gas fields such as carbonate rocks, shale oil and gas and compact oil and gas, the complicated rock core preparation method has the advantage that by using the combined technology of CT scanning and 3D printing, a new thought and method is provided for representation and preparation of special rock cores.

The invention relates to the field of geothermal exploitation and provides a method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies. According to the method, firstly, multilateral well holes are drilled in different depths of a reservoir of the hot dry rock, the reservoir between upper and lower multilateral well holes is fractured with the volume fracturing technology, a high-permeability hot dry rock reservoir is constructed, and finally, thermal-carrying media are injected and exploited for geothermal exploitation. Annularly-injected low-temperature thermal-carrying media flow to the fractured reservoir of the hot dry rock along the multilateral well holes in the upper part of the reservoir, flow to the multilateral well holes in the lower part under the double actions of injection pressure and potential-energy difference and finally flow back to the ground along an oil pipe. According to the method, the multilateral well and fracturing technologies are sufficiently utilized, the reservoirs of the hot dry rock are effectively communicated, the problem about crack communication during conventional double-well fracturing for injection and exploitation is solved, the potential-energy difference in different depths can be further effectively utilized, and the flowing capability of the thermal-carrying media is greatly improved. With the use of the thermal insulation oil pipe, the thermal loss in the exploitation process of the thermal-carrying media is further reduced, and the exploitation efficiency of geothermal energy is improved.

The invention discloses a drilling-sealing method and a sealing device of a coal mine underground ultrahigh pressure fracturing hole. The drilling-sealing method comprises the following steps: drilling a plugging hole on coal rock body; going on drilling a fracturing hole forward in the plugging hole; transmitting the sealing device into the plugging hole, enabling a water outlet hole of a fracturing pipe to stretch into the fracturing hole and enabling a taper sleeve sleeved on the fracturing pipe and made of soft material to plug on a hole opening of the fracturing hole; sealing by using polyurethane and solidifying for 30 minutes for 1 m length section at the hole opening of the plugging hole; and grouting cement slurry greater than 425 into the plugging hole with pressure by a grouting pipe, and solidifying for 48 hours after finishing grouting. The device comprises a grouting pipe and a slurry returning pipe and a fracturing pipe. The grouting pipe and the slurry returning pipe are arranged in the plugging hole. The grouting pipe, the slurry returning pipe and the fracturing pipe are connected integrally. A soft taper sleeve is arranged on the fracturing pipe. The soft taper sleeve is plugged at the hole opening of the fracturing hole. The invention has the advantages that the sealing method has high sealing success rate, good effect and wide application range; and the sealing device has simple structure and convenient operation.

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 discloses a system for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The system comprises a frozen-heave force test device and a permeation test device, wherein the permeation test device comprises a pressure chamber for loading a rock test piece to be tested, a pressure loading device, a permeation pressure increasing and measuring device, a water bath heating device, an ultrasonic damage test device and a data acquisition device. The invention further discloses a method for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The method comprises the following steps: carrying out repeated freezing-thawing tests on a rock by the frozen-heave force test device, measuring the frozen-heave force change of the rock test piece, putting the rock into the pressure chamber, applying a pressure to the rock test piece by the pressure loading device, and testing a rock permeation coefficient k and ultrasonic wave speed transmission time t under the action of flowing liquid with different temperatures and pressures so as to make a research on rock damage and permeability.

The invention provides a device and a method for measuring the gasometry permeability of rock under high pressure and belongs to the field of exploration and development of oil fields. The method comprises the following steps of: firstly, sampling gas reservoir rock and testing the rock sample by using test gas to acquire the permeating quantity of the rock sample to the test gas under the high pressure and pressure of the test gas at the moment; secondly, measuring the viscosity of the test gas under different pressure at experimental temperature to acquire a relational expression between the viscosity and the pressure of the test gas; and finally, processing the data to acquire the gasometry permeability of the rock under the high pressure. A process and the method for measuring the gasometry permeability of the rock under high pressure are established; furthermore, by analysis of the property of the gas under the high pressure, a method for processing the data of the gasometry permeability of the rock under the appropriate high pressure can be implemented; under the condition like that of high-pressure gas reservoir stratum, the gasometry permeability of the rock under the high pressure can be obtained more accurately; and data support is supplied to the development of high-pressure gas reservoir.

The invention discloses a high-flow-conductivity acid fracturing method for carbonate rock reservoirs, and belongs to the field of reservoir reconstruction technologies. The high-flow-conductivity acid fracturing method includes applying acid fracturing processes for corroding crack by acid fluid and hydraulic fracturing processes for filling the crack with added sand in a combined manner, to be more specific, forming the crack in the carbonate rock reservoirs by the aid of non-reactive ahead fluid and reducing the surrounding temperatures of wall surfaces of the crack; injecting high-concentration acid fluid systems to corrode the wall surfaces of the artificial crack and forming uneven grooves in the wall surfaces of the crack by means of corroding to allow the crack to have certain flow-conductivity after the crack is closed; enabling high-viscosity sand-carrying fluid to carry proppants and flow into crack systems and filling the crack with the high-viscosity sand-carrying fluid to further improve the flow-conductivity of the crack. The high-flow-conductivity acid fracturing method has the advantages that the high-flow-conductivity acid fracturing method is reasonable in design, simple in process and convenient to implement in fields, the high-flow-conductivity crack systems with the acid-corroded crack and crack closing supporting functions can be formed, oil and gas flow resistance can be reduced, the acid fracturing reconstruction effects can be improved for the carbonate rock reservoirs, and the high-flow-conductivity acid fracturing method can be widely used for acid fracturing reconstruction construction for limestone, dolomite and carbonate rock oil and gas reservoirs with mud.

The present invention relates to rock bolts which may be used in mining applications. The rock bolt of this invention includes a mechanical anchoring arrangement to facilitate retaining the rock bolt in a borehole, and also a drill bit to enable self drilling of the rock bolt. Rotation of the rock bolt about an axis of the rock bolt in a first direction causes the drill bit to drill into rock and to create a borehole to receive the rock bolt. Subsequently, rotation in the opposite direction actuates a mechanical anchoring arrangement to anchor rock bolt.

A 3D glass porous medium model for microscopic oil displacement is provided. The invention mainly solves the problem of the existing rock core model for microscopic oil displacement can not simultaneously assure high simulation degree and 3D visibility during the whole oil displacement process when conducting microscopic oil displacement experiment. The invention is characterized in that the model is formed by tightly bonding of at least three substrates made of glass material, a rock core planar pore channel (5) is respectively etched on the upper surface of a bottom substrate (12) and intermediate substrates (9, 10, 11), a plurality of throat channels (3) passing through the substrate are opened at a plurality of large apertures of the intermediate substrates (9, 10, 11), and a liquid injection channel (1) and a liquid outflow channel (2) are disposed on the model and respectively communicated with the large rock core planar pore channels (5) on the bottom substrate (12) and the first intermediate substrate (9). The invention can perform accurate 3D simulation of the rock core pore and assure high simulation degree during experiment, and the whole process is visible.

The invention discloses a method for calculating tight sandstone reservoir permeability based on hole feature parameters. The method includes the steps of calculating hole structural parameters through a rock core mercury penetration experiment, establishing a permeability well logging interpretation model through a first characteristic function which is established through the hole structural parameters, converting nuclear magnetism T2 spectrum into a pseudo capillary pressure curve through correlations existing between nuclear magnetism T2 spectrum distribution and mercury penetration hole diameter distribution, and calculating the reservoir permeability according to a second characteristic function which is established through the pseudo capillary pressure curve. In practical application, the quantitative, continuous and high-precision pseudo capillary pressure curve is obtained through nuclear magnetic resonance well logging information under the condition that laboratory mercury penetration information does not exist, and finally, calculation of the reservoir permeability is conducted according to the second characteristic function which is established through the pseudo capillary pressure curve.

The invention relates to a reservoir stratum identification method, which comprises the following steps of: separating out a contact well wall zone, a near well wall zone, a far well wall zone and an ultra far well wall zone according to the detection depth properties of different logging instruments; extracting the stratum seam hole development information of the contact well wall zone by using a micro computed tomography (CT) porosity analysis or electric imaging spectrum resolving technology; acquiring the stratum seam hole development condition of the near well wall zone based on dipolar sound wave logging data; acquiring the stratum seam hole development condition of the far well wall zone based on small-angle nearly perpendicular azimuth reflecting sound wave logging data; discovering a seam hole development belt in the stratum of the ultra far well wall zone based on well side seismic channel data; and judging whether the reservoir stratum has industrial capacity based on seam hole information extraction of the four detection depth zones. By establishing the effective reservoir stratum identification method with depth detection gradient and azimuth directing capacity, the identification coincidence rate of the effective reservoir stratum is improved, and a powerful technical support is provided for implementing the strategic goals of 'high yield in rare wells and high efficiency in sparse wells' in Chinese major oilfields.

A method and a device to thermally fragment rock for excavation of vertical and directional boreholes in rock formations, preferentially hard rock, using highly exothermic reactions. Exothermic reactions are initiated directly in the pressurized, aqueous environment of a water-based drilling fluid preferably above the critical pressure of water (221 bar). After reaction onset temperatures within the reaction zone exceed the critical temperature for water (374° C.) providing supercritical conditions, which favor the stabilization of the reaction, e.g. a supercritical hydrothermal flame. Since reactions can be run directly in a water-based drilling fluid, the method proposed here allows high density drilling action as in conventional rotary drilling. A part from the hot reaction zone of the proposed reaction can be brought directly to the rock surface in case of hard polycrystalline rock, where high temperatures are required.

The invention relates to a pressure rock failure and instability process and dynamic permeability test apparatus and a method thereof. A stress strain signal, a sound emission signal and an apparent resistivity signal in the pressure rock failure and instability process are acquired and processed by using a large pressure rock permeability test device to obtain the stress strain relationship, the quantity and positions of sound emission events and the rock apparent resistivity change rule induced by pressure water permeability increase in large pressure rock failure and instability process in order to obtain the dynamic evolution role of crack expansion, perforation and instability in the rock failure process under hydraulic-mechanical coupling action and the corresponding dynamic permeability. The hydraulic-mechanical coupling failure mechanism and the pressure permeability of rocks, and the deformation and strength characteristics, the crack expansion, perforation and failure characteristics and the permeability evolution rule of pressure water in the crack expansion-perforation-failure process of the rocks under the hydraulic-mechanical coupling action are researched in the invention. The apparatus and the method have important engineering values in realization of safe mining under water pressure on pressure water.

The invention relates to a digging method for preventing a strong or strong rock burst on an active face. The technical problem to be solved is to provide an active face strong or strong rock burst prevention digging method capable of effectively reducing the rock burst frequency on the active face and reducing the destructiveness of the rock burst. The method comprises the following specific steps: a, carrying out the shothole arrangement and charging design according to a conventional slotting proposal; b, drilling tunneling shotholes and stress-relief shotholes on the slotted active face; c, charging the tunneling shotholes in a convention mode, and charging the stress-relief shotholes in the 32 mm hole bottom within a deep buried range from 2 to 3m; d, detonating the stress-relief shotholes and the tunneling shotholes in turn; and e, tapping slag, and repeating the steps till the digging is completed. The method is mainly applied to deep buried hard rock tunnel projects for traffic, mining, water conservancy and hydraulic power, and the like.

The invention discloses a method for evaluating fracturing property of shale based on rock debris microscopic characteristics. The method comprises the following steps: (1) taking the rock debris at specific depth in reservoir of an oil gas well; (2) acquiring the relative amount of total-rock minerals through X-ray diffraction test for the rock debris, and calculating a brittleness index I1 of the minerals; (3) testing the nanoindentation microcosmic mechanical parameters of the rock debris and calculating a microcosmic mechanical brittleness index I2 thereof; (4) calculating the surface crack fractal parameter of the rock debris through scanning electron microscope, thereby acquiring a fractal brittleness index I3; (5) performing 3D laser scanning on the rock debris and calculating the surface rough brittleness index I4; (6) weighting the above four brittleness indexes according to the practical condition of the oil field, thereby acquiring a comprehensive fracturing index I; (7) repeating the steps (1)-(6), calculating the fracturing indexes of the rock debris at different depths and drawing a whole-well comprehensive fracturing index longitudinal layout. According to the method provided by the invention, the comprehensive fracturing index of the shale rock debris can be acquired and the necessary basis is supplied for fracture selecting layer with core-taking difficulty or without core shale reservoir.

The invention belongs to the technical field of foam performance study chip analysis, and mainly relates to a glass medium model that imitates a rock core structure and can be used for foam flooding and percolation mechanism study in tertiary oil recovery. The glass medium model includes a first liquid inlet pool, a second liquid inlet pool, a glass substrate, coverglass, a drainage hole, a drainage pool, a drainage pool channel, a micro channel imitating the rock core structure, a first liquid inlet hole, a second liquid inlet hole, a microbubble generation module and a microbubble splitting module. Specifically, the micro channel imitating the rock core structure is etched on the glass substrate; the first liquid inlet hole, the second liquid inlet hole, and the drainage hole are respectively disposed at two ends of the coverglass; the two liquid inlet holes are communicated with the microbubble generation module respectively through the two liquid inlet pools; the microbubble generation module is communicated with the microbubble splitting module; the microbubble splitting module is communicated with the micro channel imitating the rock core structure; and two ends of the drainage pool channel are respectively communicated with the tail of the micro channel imitating the rock core structure and the drainage pool, and the drainage pool is communicated with the drainage hole.

The invention discloses a detection method and a device for effective fractured intervals in an unconventional shale oil and gas reservoir. The method includes: collecting logging information and core sample information of intervals of interest; calculating volume contents of all minerals in rock generating the intervals of interest according to the collecting logging information and the core sample information; calculating the poisson ratio of all mineral constituents in the rock generating the intervals of interest according to the core sample information and rock space volume average elastic parameter models; calculating the fragility index of the rock generating the intervals of interest according to the volume contents of all the minerals and the poisson ratio of all the mineral constituents in the rock generating the intervals of interest; and selecting the intervals of interest with the high rock fragility index in the shale as the effective fractured intervals in the unconventional shale oil and gas reservoir. By means of the detection method and the device for the effective fractured intervals in the unconventional shale oil and gas reservoir, the actual production requirement for selecting the effective fractured intervals in exploration and development of the unconventional shale oil and gas reservoir can be met.

The invention discloses a device for simulating crack initiation and evaluating fissured flow under true triaxial stress and belongs to the field of fracture acidizing. The device disclosed by the invention comprises a rock core clamping system, a true triaxial stress loading system, an acid liquor and fracturing fluid injection system, a filtration capacity measuring system and a fracturing data acquisition and processing system, wherein the rock core clamping system is used for clamping a cubic rock core sample which has the side length of 100-300mm and a simulation wellbore is embedded inside the rock core sample; the true triaxial stress loading system is used for applying stresses on the rock core sample in an X axis direction, a Y axis direction and a Z axis direction, so as to simulate a true triaxial stress state of the rock core sample; the acid liquor and fracturing fluid injection system is used for injecting acid liquor and fracturing liquid into the simulation wellbore of the rock core sample, so that crack initiation is carried out on the rock core sample and a fracture extends to simulate the fracture acidizing process of the rock core sample; the filtration capacity measuring system is used for injecting saline water into the rock sample subjected to crack initiation, thus data representing filtration capacity of the fracture of the rock core sample are measured; and the fracturing data acquisition and processing system is used for acquiring data representing a simulated crack initiation process in the rock core sample and data representing the filtration capacity of the fracture in the rock core sample, processing the data and outputting a processing result.

The invention relates to a method and a device for calculating effective porosity of a compact oil storage layer. The method comprises the following steps: preparing a saturate rock sample; performing nuclear magnetic resonance measurement on the saturate rock sample, thereby acquiring T2 point amplitude of the saturate rock sample, nuclear magnetic porosity of the saturate rock sample and total amplitude of T2 spectrum of the saturate rock sample; performing dewatering treatment on the saturate rock sample under an effect of centrifugal force and performing the nuclear magnetic resonance measurement, thereby acquiring the T2 point amplitude of the centrifugal rock sample, the nuclear magnetic porosity of the centrifugal rock sample and the total amplitude of T2 spectrum of the centrifugal rock sample; acquiring the porosity component of the T2 point of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the porosity component of the T2 point of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; acquiring a T2 cut-off value according to the total amplitude of T2 spectrum of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the total amplitude of T2 spectrum of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; utilizing the T2 cut-off value to acquire the valid saturability of the flowing fluid; calculating the effective porosity of the compact oil storage layer according to the valid saturability of the flowing fluid.

The invention relates to a deep hole arranging method in mining, which comprises the following steps of: arranging deep holes in mining in a sectional plan stoping route according to certain row-to-row distances and hole concentration coefficients, and carrying out deep hole construction in mining by adopting an air operated or hydraulic drill jambo, wherein the deep hole arrangement in mining of 2-3 rock drilling centers is adopted according to the working mechanism and the working parameter of rock drilling equipment, and at least one hole in adjacent holes is not perpendicular to a horizontal surface when fan-shaped holes are arranged according to the 2-3 rock drilling centers. The invention enables the concentration degrees of the holes on the depth direction to differ slightly, i.e. the densities of the holes at hole mouths and hole bottoms differ a little. Under the condition of a certain ore caving range, the deep hole arranging method is beneficial to reducing the quantity of the holes and saving the rock drilling and blasting cost in mining, thereby improving the ore caving quantity of the holes in unit length.

Described herein is a method and system for characterizing in-ground rock types from measurement-while-drilling data in a mining environment. The method includes the steps of drilling holes at a plurality of selected locations within a region of interest; collecting measurements while drilling to obtain an array of data samples (162) indicative of rock hardness at various drilling depths in the drill hole locations; obtaining a characteristic measure (163) of the array of data samples; performing Gaussian Process regression (164) on the characteristic measure; and applying boundary detection (166) to the rock hardness output data obtained from the Gaussian process model to identify the distribution (280) of at least one cluster of rock type within the region of interest.

The invention provides a method and a device for identifying a shale oil deposit effective reservoir. The method comprises the following steps: collecting logging data and core data of an interest interval; determining a content of organic carbon of shale of the interest interval according to the logging data and the core data; determining a rock brittleness index of the shale of the interest interval according to the logging data and the core data; determining a formation pressure coefficient of the shale of the interest interval according to the logging data and the core data; determining weighted values corresponding to the content of the organic carbon, the rock brittleness index and the formation pressure coefficient according to oil well data and oil deposit capacity which are stored in advance; and identifying the shale oil deposit effective reservoir according to the weighted values, the content of the organic carbon, the rock brittleness index and the formation pressure coefficient. Through the method and the device, actual production requirement of fracturing effective intervals in exploration and development of the shale oil deposit effective reservoir are met.

A system and method for storage of Greenhouse Gasses, in particular CO2 gasses, in an underground reservoir of rock at the shallowest depth necessary to achieve a combination of temperature and pressure sufficient to ensure that the reservoir is hydraulically sealed and isolated. Particle Jet Drilling is utilized to afford an economical process of drilling the necessary deep well bores to reach the deep rock formations. The underground reservoirs are formed through hydraulic dilation of existing joints in the rock formations.

The invention discloses a method for calculating a tight reservoir fracturing transformation volume area. The method comprises the following steps that multiple hydraulic fracture non-planar turning extension models, a formation stress field change model, a reservoir pressure file change model and a natural fracture failure criterion in the tight reservoir horizontal well fracturing process are established, geological parameters, horizontal well fracturing construction parameters and the total fracturing time are obtained, an initial fracture filter loss value, an initial fracture half-length value, an initial in-fracture pressure value, an initial fracture extension turning angle, initial permeability and an initial fracturing time value are endowed, all the models are calculated, and natural fracture failure point coordinate data is calculated; a spatial and numerical integration method is utilized to calculate tension failure transformation area volume and shear failure transformation area volume in a reservoir respectively, and the spaces of the two parts are united and regarded as a total transformation volume area. By adopting the method, accurate, economic and rapid tight reservoir horizontal well fracturing evaluation can be achieved, and the problem that effort, money and time are wasted in the existing tight reservoir horizontal well fracturing transformation volume area calculating process is solved.