5 results about "Carbon isotope composition" patented technology

The invention discloses an automatic analysis device and method for carbon isotope in deep sea water dissolved gas, and relates to the technical field of laser spectrum analysis, the device comprises an automatic sample introduction unit and a laser spectrum detection unit; the automatic sample injection unit is used for automatic sample injection of seawater separation sample gas and sample injection of standard gas; the laser spectrum detection unit is used for executing the functions of spectrum data acquisition, signal-to-noise ratio enhancement, data post-processing and carbon isotope composition calculation; the laser spectrum detection unit comprises three lasers, and the first laser is a methane laser corresponding to a main methane absorption spectral line; the second laser is a methane isotope laser and corresponds to 12CH4 and 13CH4 methane isotope absorption spectral lines; and the third laser is a carbon dioxide isotope laser and corresponds to carbon dioxide isotope absorption spectral lines of 12CO2 and 13CO2. The carbon isotope of methane and carbon dioxide gas dissolved in deep sea water is detected by using an automatic sample injection and automatic measurement method.

The invention belongs to the technical field of deep-time atmosphere carbon dioxide isotope composition estimation, and particularly relates to a high-resolution deep-time atmosphere carbon dioxide isotope composition estimation method and system, and the method comprises the steps: S100, reconstructing the global surface average temperature based on the atmosphere carbon dioxide concentration pCO2; s200, calculating the relative content of carbonate ions and bicarbonate radical ions in the marine carbonate system; s300, determining a fractionation coefficient; s400, determining a difference value V of carbon isotopes of the carbonatite and surrounding seawater in the carbonatite deposition process on the basis of the carbon isotope difference of the carpopods and the carbonatite; according to the method, carbonate rocks which generally exist in geological history and are continuously deposited on time are selected as a tool for atmospheric carbon dioxide isotope reconstruction, and the atmospheric carbon dioxide isotope is reconstructed through quantitative evaluation of the geological history ocean surface layer temperature, the ocean carbonate rock salt content and the fractionation effect during formation of the carbonate rocks. And the atmospheric carbon dioxide isotope composition in the deep-time geological historical evolution process can be accurately calculated.

The invention relates to the field of oil-gas exploration, and discloses a method for determining an effective gas source rock exhaust threshold by using a delta13C1-Ro relationship, and the method comprises the steps: obtaining corresponding vitrinite reflectance of an effective gas source rock stratum section at different buried depths, and drawing an evolution curve of the vitrinite reflectance with respect to the buried depths; obtaining the methane stable carbon isotope composition of the found natural gas in the research area; natural gas causes and sources are judged, and natural gas from the effective gas source rock stratum section is screened out; establishing a relationship between natural gas methane stable carbon isotope composition from the gas source rock and vitrinite reflectivity, and drawing a change curve; and determining the exhaust threshold of the effective gas source rock stratum section by utilizing the screened natural gas methane stable carbon isotope composition value in combination with the evolution curve and the change curve. According to the method, the accuracy and the pertinence of determining the exhaust threshold are improved based on actual geochemical data inversion.

The application provides an innovative method for analyzing carbon isotope composition of trace gas inclusions in mantle mineral rocks. The cavity of the ball mill and the mineral rock sample in the cavity are cleaned by a protective gas to remove possible gas impurities; the mantle mineral rock sample is placed in the micro-cavity of a three-dimensional high-energy vibration ball mill for vibration ball milling treatment. The released gas inclusions are transferred to a gas chromatography-isotope ratio mass spectrometry analysis system through a sealed rotary three-way valve for accurate carbon isotope composition analysis. The risk of non-native gas pollution can be significantly reduced through normal temperature crushing technology. Combined with ultra-trace gas extraction technology and efficient pre-concentration technology, the effective recovery and enrichment of trace gas in the gas inclusions in the mantle mineral rock are realized. By using high-sensitivity and high-precision isotope ratio measurement technology, the detection limit is improved, the background interference is effectively reduced, and the reliability of the analysis result is ensured.

Embodiments of the present application relate to the application of thermal methods to test or analyze materials, and in particular to a method for estimating the precipitation temperature of pitchblende in granite-type low-temperature hydrothermal uranium deposits, which can include the following steps: S10: collecting vein ore samples containing primary pitchblende veins in the survey area; S20: processing the vein ore samples to obtain calcite single mineral samples and fluorite single mineral samples; S30: analyzing the calcite single mineral and fluorite single mineral samples to determine the carbon isotope composition of the calcite single mineral samples and the carbon isotope composition of the fluid inclusions in the fluorite single mineral samples; S40: determining the carbon isotope equilibrium temperature according to the carbon isotope composition; S50: determining the precipitation temperature of pitchblende in granite-type low-temperature hydrothermal uranium deposits according to the carbon isotope equilibrium temperature. The method provided by the embodiments of the present application can determine the precipitation temperature of pitchblende through the carbon isotope composition of the coeval calcite and fluorite, and the determined precipitation temperature is accurate and reliable.