10 results about "Hydrogen index" patented technology

The application discloses a kind of fluid identification method and system of water-saturated hydrogen index contrast method, calculate reservoir matrix porosity;Electric imaging and double lateral data are combined to calculate rock fracture porosity, and sum matrix porosity to total porosity;Assume that bedrock reservoir pore is water-saturated, select the dynamic skeleton neutron value of the dense layer section of lowest porosity, high resistivity dynamic skeleton as fixed skeleton value, calculate the dynamic skeleton neutron value of the purpose layer in combination with total porosity;According to dynamic skeleton neutron value, calculate water-saturated hydrogen index of research interval;Water-saturated hydrogen index is compared with neutron actual logging value to calculate neutron difference value;In combination with gas production test data, the relationship between acoustic time difference and neutron difference value and the change relationship between matrix porosity and neutron difference value are analyzed using neutron difference value, and the relationship chart of quantitative identification gas-water layer is obtained.The method eliminates the influence of anisotropy, fracture occurrence and the like of bedrock lithology, highlights the characteristics of reservoir gas layer, and can more accurately identify the properties of reservoir fluid.

The present invention describes a petrophysical modeling method that integrates well nuclear spectroscopy data and interpretations with some input petrophysical parameters, decomposing the hydrogen and chlorine signals into their specific origins, such as well drilling fluid, kerogen, water, and hydrocarbons in the pores. The model consists of a set of equations that are solved sequentially with input values defined by Monte Carlo simulation, from which properties such as salinity, porosity, density, sigma, and hydrogen index of the kerogen are calculated. The acceptability of such results is verified by comparison with logs such as density, porosity by NMR, and macroscopic cross section of thermal neutron capture.

The invention relates to the technical field of hydrocarbon source rock evaluation standard establishment methods, in particular to a hydrocarbon source rock evaluation standard establishment method based on rock pyrolysis, which comprises the following steps: based on five original parameters obtained by pyrolysis, calculating six derived parameters including total organic carbon content, hydrogen index, hydrocarbon source rock oil production rate, hydrocarbon potential, effective carbon content and residual carbon content; establishing an evaluation standard of the hydrocarbon source rock according to the organic matter abundance, the organic matter type and the maturity, wherein evaluation parameters of the organic matter abundance comprise the total organic carbon content and the hydrocarbon production potential quantity; the evaluation parameters of the organic matter type comprise a hydrogen index and a hydrocarbon source rock oil generation rate; the maturity evaluation parameters comprise a pyrolysis temperature peak value of kerogen cracked hydrocarbon. According to the method, the evaluation standard of the hydrocarbon source rock is established, evaluation is carried out from the three aspects of organic matter abundance, organic matter type and maturity, technical guarantee is provided for exploration, development and evaluation of the hydrocarbon source rock, and the method is particularly suitable for evaluation of tight oil hydrocarbon source rock.

The application discloses a kind of based on flushing zone residual oil and gas saturation reservoir category determination method, it is related to well logging interpretation technical field, steps are by conventional well logging to obtain neutron, density logging data;Residual oil and gas of flushing zone is obtained density;Calculate the hydrogen index of residual oil and gas of flushing zone;Residual oil and gas of flushing zone is obtained neutron apparent porosity and density apparent porosity;According to the logging response model of neutron and density in oil and gas reservoir, establish the mathematical model of residual oil and gas saturation of flushing zone, combine shale corrected neutron porosity and density porosity, calculate the residual oil and gas saturation of flushing zone, and when exceed specified index, define as gas layer.The application can obtain residual oil and gas saturation of flushing zone by using conventional neutron and density logging related data, which is less affected by geological factors, so that the calculation of residual oil and gas saturation of flushing zone is more accurate, the evaluation of reservoir gas content is more accurate, and the application range is more extensive.

The invention belongs to the technical field of welding materials, and particularly provides a high-toughness welding rod for backing welding, the high-toughness welding rod for backing welding comprises a core wire and a coating wrapping the core wire, and the coating comprises, by weight, 40-46% of CaCO3, 20-25% of CaF2, 5-8% of TiO2, 8-12% of SiO2, 7-9% of Si-Fe, 4-7% of Mn, 1-3% of CeO2, 0.5-1% of Ni and the balance iron powder. The high-toughness welding rod for backing welding is a high-toughness basic welding rod with a low-hydrogen potassium-sodium coating, welding spatter is small, forming is attractive, deslagging is easy, all-position welding can be conducted, single-face welding and double-face forming can be achieved during backing welding of a welded pipeline, the diffusible hydrogen content is low, and the welding state and heat treatment state performance is excellent; and the impact energy at the low temperature of-50 DEG C can be ensured to be more than 100J. A diffusible hydrogen mercury method test result [H] of deposited metal is less than or equal to 5mL / 100g, and the index requirement of ultra-low hydrogen is met. The method is suitable for 50Kg-level maritime work matched backing welding, and can be used for backing welding, repairing and the like of pipeline steel and alloy steel.

In the formula for the redox potential E based on the Nernst equation, with the temperature set at 37℃ (310K), the redox potential E of hydrogen / hydrogen ions is E = -0.061 × pH + 0.031 × pH² (V). At pH = 7.4, E = -0.451 + 0.031 × pH² (V). The hydrogen index pH² of the test subject is measured, and E is calculated using the above formula. According to the potential verification method of the present invention, by blowing air and air containing hydrogen into phosphate buffer, measuring the potential before and after blowing, performing necessary corrections, and obtaining a linear regression line, the change in potential accompanying the change in hydrogen index pH² can be confirmed. It can be seen that the calculated redox potential is approximately the same as the actual redox potential.

The embodiment of the present application discloses a shale oil interval evaluation method, device, equipment and storage medium, wherein the method comprises: obtaining free hydrocarbon data, hydrogen index data and porosity data of a target shale oil interval; determining a target enrichment coefficient corresponding to the target shale oil interval according to the free hydrocarbon data, hydrogen index data and porosity data of the target shale oil interval; comparing the target enrichment coefficient with an enrichment coefficient threshold value corresponding to the target shale oil interval, and determining a sweet spot evaluation result of the target shale oil interval according to the comparison result; wherein the enrichment coefficient threshold value is a threshold value for evaluating the enrichment coefficient of an interval in a target region to which the target shale oil interval belongs. The technical scheme of the embodiment of the present application can determine the enrichment coefficient of the target shale oil interval based on the free hydrocarbon data, hydrogen index data and porosity data, and can improve the sweet spot analysis accuracy by quantitatively evaluating the target shale oil interval, thereby providing convenience for shale oil exploration and development.

This invention discloses a method for identifying and processing reliable geochemical data of mud-contaminated rock cuttings, relating to the field of geochemical testing technology for rock cuttings samples. The method includes: F1, correction of contamination data identification; F2, determination of contamination error; and F3, for wells without pyrolysis spectra, recursively estimating the contamination amount using the increasing contamination pattern, summarizing two correction modes. The technical solution of this invention is applicable to rock cuttings samples contaminated by solid powdered additives in water-based mud. It requires samples from surrounding uncontaminated wells for comparison to determine whether the target well sample is contaminated, core / well wall core samples as standard samples, and pyrolysis spectra from some wells. By using this technology to identify and correct the contaminated sample, the TOC and S2 parameters are regressed to the core region, eliminating errors in organic matter abundance evaluation. Simultaneously, using this technology to identify and correct the contaminated sample's hydrogen index is also regressed to the core region, eliminating optimization effects in organic matter type evaluation.

The invention discloses a low-pressure equivalent measurement method and system for nuclear magnetic resonance relaxation characteristics of high-pressure natural gas, and belongs to the technical field of petroleum and natural gas development. The method comprises the following steps: calculating an equivalent measurement pressure required by ethane under an equivalent condition based on a hydrogen content index of methane under a formation temperature and formation pressure condition of a rock sample; ethane is injected, and the nuclear magnetic porosity of the rock sample is collected under the equivalent measurement pressure and the formation temperature. By means of the method, nuclear magnetic resonance parameters equivalent to deeper formation pressure can be measured in a laboratory, and therefore the exploration and development requirements of ultra-deep oil and gas wells are met.

The invention discloses a neutron gamma density improvement method based on drill collar inelastic gamma, and relates to the technical field of petroleum and natural gas development, and the method comprises the steps: s1, simulating total inelastic gamma-ray spectrum data recorded by a logging instrument under the conditions of different stratum densities and hydrogen-containing indexes; s2, extracting drill collar inelastic gamma counts mixed in the total inelastic gamma energy spectrum; s3, a stratum inelastic gamma count which is not affected by drill collar inelastic gamma information is obtained; s4, obtaining a formation density calculation method based on formation inelastic gamma counting and drill collar inelastic gamma counting information combination; and s5, setting the model stratum in the step s1 as a saturated limestone stratum to obtain neutron gamma density logging response simulation data of the saturated limestone stratum, and repeating the steps s2 to s4 to calculate the apparent density of the gas-bearing stratum. Compared with a conventional algorithm, the density sensitivity is improved, drill collar inelastic gamma counting is introduced to correct fast neutron distribution, and the influence of a gas layer on the calculated stratum apparent density result is reduced.