A Method for Evaluating the Influence of Geological History Temperature Evolution on Biogas Production Rate

Abstract

The invention relates to a method for assessment of influences of geohistorical temperature evolution on biogas yield. The method includes: firstly, acquiring temperature factors under different temperature conditions according to biological simulation experiment results; secondly, acquiring temperature factor evolution history of a certain well point position according to temperature evolution history of a source bed at the corresponding well point position, and solving a geohistorical average temperature factor of the corresponding position; thirdly, taking a ratio of the geohistorical average temperature factor to a current temperature factor as a correction coefficient of the position; fourthly, solving correction factors of the source bed at multiple well positions to obtain a planargraph of the correction factors of the source bed; fifthly, acquiring a temperature factor graph of the source bed under current temperature conditions according to a current temperature graph of thesource bed; sixthly, multiplying current temperature factors of the source bed with the correction factors to obtain a geohistorical average temperature factor graph of the source bed to reflect influences of geohistorical temperature evolution on biogas yield. By adoption of the method, quantitative assessment of the influences of geohistorical temperature evolution on biogas yield can be realized.

Description

technical field [0001] The invention relates to the calculation of biogas resources in the field of natural gas exploration, in particular to a method for evaluating the influence of geological history temperature evolution on biogas production rate. Background technique [0002] Biogas refers to the natural gas formed by the biochemical action of anaerobic bacteria in the immature stage of different types of organic matter. Under different temperature conditions, the activity of microorganisms is different, resulting in different methane production. Fuertez et al. (2017) confirmed through bio-simulation experiments that the temperature range between 23°C and 37°C is the maximum methane output, and the temperature is too high or too low to be conducive to the formation of methane. That is, under the optimum gas production temperature condition, the output of methane is the largest. [0003] Based on this principle, in biosimulation experiments, in order to allow organic ma...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the influence of geography temperature evolution on biogas production rate, which is used to evaluate the influence of geography temperature evolution on biogas production rate for solving biological simulation experiments. It is unreasonable to set the gas production rate of biogas source rocks as the gas production rate under the optimum temperature condition

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