Representation method of oil-gas exploration and oil-gas reservoir by taking vital bacterium abnormality and dead bacterium abnormality of methane-oxidizing bacteria as indicators

Abstract

The invention discloses a representation method of oil-gas exploration and oil-gas reservoir by taking vital bacterium abnormality and dead bacterium abnormality of methane-oxidizing bacteria as indicators, comprising the following steps: collecting a sample above an oil-gas exploration and oil-gas reservoir representation area according to the specific grid degree, the sampling depth and the sampling amount, packaging and saving the sample according to the specific condition; adopting a conventional microorganism counting method to obtain the vital bacterium quantity and the dead bacterium quantity of the methane-oxidizing bacteria in the sample; drawing an equal bacterium line of the vital bacteria and an equal bacterium line of the dead bacteria on a map, a topographic map, a geologic map or a topography-geologic map to obtain the vital bacterium abnormality and the dead bacterium abnormality; comprehensively comparing the vital bacterium abnormality and the dead bacterium abnormality; and estimating and predicting the underground oil-gas resource condition of the oil-gas exploration and oil-gas reservoir representation area, or extracting an exploitation scheme of the oil-gas reservoir according to the characteristics of the vital bacterium abnormality and the dead bacterium abnormality and the differences of the vital bacterium abnormality and the dead bacterium abnormality, and combining the results of geological exploration, geochemical exploration and geophysical exploration.

Description

technical field [0001] The invention relates to a method for oil and gas exploration and oil and gas reservoir characterization. Background technique [0002] Oil and gas reservoirs, including oil reservoirs, natural gas reservoirs, oil + natural gas reservoirs and gas hydrate reservoirs. [0003] The oil and gas industry is an important basic energy industry. The urgent problem to be solved in the current exploration and development of oil and natural gas (including gas hydrate) is how to improve the efficiency of exploration and development; the key to solving the above problems is to develop and apply efficient exploration and development methods and technical means. [0004] Microbial oil and gas exploration and oil and gas reservoir characterization technology is an important branch of oil and gas exploration and oil and gas reservoir characterization technology. It is an important technical means to predict and monitor the development of oil and gas reservoirs, the d...

AI Technical Summary

Problems solved by technology

That is to say, when the existing technology only uses the abnormality of live bacteria of methane oxidizing bacteria as the microbial exploration index to carry out oil and gas exploration, it is not only possible not to find those micro-fractures in the exploration area that are in the squeezed state (but actually the oil and gas exploration section). potential targets), and it is also impossible to evaluate in which areas the total flux of micro-leakage methane in the exploration area is high and which areas are low in the whole process of oil and gas generation, storage, migration, and preservation.

[0011] (2) Since the existing technology can only obtain the microbial exploration index of abnormal viable methane oxidizing bacteria from the surface soil and / or sediments in the exploration area, the existing technology cannot be used to investigate the history of micro-leakage of methane in oil and gas exploration areas and its evolution

The inevitable result of this requirement on the one hand leads to a significant increase in sampling costs, especially for the characterization of marine oil and gas reservoirs, and the cost increase will be more significant; In fact, it cannot be implemented immediately in the production area, because most of the oil and gas reservoirs today have not carried out microbial oil and gas reservoir characterization work. The number of viable bacteria cannot immediately give the microbial characterization results of the oil and gas reservoir, but must wait for a long period of time (at least half a year; if the time is too short, it is difficult to reflect the number of viable bacteria in the methane oxidizing bacteria between two time points. After the second sampling and obtaining the number of viable methanotrophs, meaningful reservoir characterization results can be obtained

[0014] (5) It is impossible to compare the current situation of oil and gas reservoir exploitation with the situation before oil and gas reservoir exploitation, which restricts our evaluation of the relationship between the remaining oil and gas resources and the amount of exploitation, which is not conducive to the adjustment of the layout of oil and gas reservoir production areas in the middle and late stages wells and develop efficient mining plans

[0015] (6) There is no specific plan for the grid layout of sampling points, sampling depth, sampling volume, sample packaging and sample storage conditions suitable for oil and gas exploration and reservoir characterization

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