Soil alteration carbonate measuring method integrating carbon isotope ratio

Abstract

The invention discloses a soil alteration carbonate measuring method integrating carbon isotope ratio, which comprises the following steps that: a sample is cracked in a golden tube sealing system; gas components after cracking are collected; the content of CO2 in a cracked product is determined; and the carbon isotope ratio of CO2 in the cracked product is determined. Compared with the prior art, the soil alteration carbonate measuring method integrating carbon isotope ratio increases the determination of the carbon isotope ratio of CO2 in the cracked product in a traditional soil Delta C measurement method so as to overcome the defects of the prior art that because other sources unrelated to hydrocarbon in underground oil and gas reservoirs, such as all CO2 produced in surface environment, are integrated with Ca2+, Fe2+ and other ions in surrounding media to form Delta C, indexes or methods which directly evaluate the underground oil and gas reservoirs only through the CO2 content in the cracked product under the condition of 600DEG C overestimate the contribution of Delta C to hydrocarbon in underground oil and gas reservoirs.

Description

Technical field: [0001] The invention belongs to the field of oil and gas geochemical exploration, and relates to a soil alteration carbonate (ΔC) measurement method, in particular to a soil ΔC measurement method combined with carbon isotope ratios. Background technique: [0002] Altered carbonate (ΔC) is an important indicator in current oil and gas exploration. The basic principle of determining ΔC in the Petroleum and Natural Gas Industry Standard SY / T 6009.6-2003 of the People's Republic of China (referred to as the standard) is: when the low-molecular hydrocarbons in the oil and gas reservoir penetrate or diffuse upward from the deep reducing environment to the near-surface oxidizing environment , a part is adsorbed by soil particles, and a part is oxidized to CO 2 , which decomposes silicates and aluminosilicates in sediments to produce some kind of stable special carbonates. This type of special carbonate pyrolyzes in a specific temperature range (500-600°C) and can...

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Problems solved by technology

In this way, only by cracking at 600 °C, the measured CO in the cracked product 2 The content is directly used as an index or method to evaluate underground oil and gas reservoirs, which obviously overestimates the contribution of hydrocarbons in underground oil and gas reservoirs in altered carbonate (ΔC), and the superposition of high background values ​​reduces the sensitivity and effectiveness of this index

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