2 results about "Carbon isotope composition" patented technology

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.

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.