Method for evaluating type of kerogen

Abstract

The invention discloses a method for evaluating the type of kerogen. The method comprises the steps of restoring original H / C atomic ratio of the kerogen, and digitalizing, quantizing and continuously representing the hydrocarbon potential of the kerogen by adopting the original H / C atomic ratio so as to evaluate the type of the kerogen. The type of the kerogen is continuously evaluated in a digitalized manner through the original H / C atomic ratio of the kerogen, so that the influence from the manmade factors and the hot evolution degree of the kerogen can be avoided, the evaluation result is accurate, the nature of conversion from organic matter to the oil-gas is fit, and the guiding for the real production is strong.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method for evaluating kerogen types. Background technique [0002] Kerogen is a solid organic body that exists in sedimentary rocks and is insoluble in organic solvents. It is the basic form of organic matter in sedimentary rocks, and it is the direct source of parent material for the generation of oil and natural gas. Kerogen is transformed from a variety of original organic substances through biochemical and physicochemical processes. Different types of kerogen not only reflect different depositional environments and sources of organic matter, but also have great differences in oil and gas generation capacity and product properties. Therefore, the accuracy of kerogen type identification and evaluation directly affects the evaluation and exploration of oil and gas resources. Work is of great significance in petroleum geology. [0003] There are many methods to distingu...

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Problems solved by technology

[0011] ③ Microscopic identification and description work is greatly affected by human factors, so the classification results vary from person to person, which affects the scientificity and reliability of the results

[0015] ① The H / C atomic ratio and O / C atomic ratio of kerogen will change with the degree of thermal evolution of kerogen. When the maturity is high, the H / C atomic ratio and O / C atomic ratio of different types of kerogen are mixed. together, indistinguishable

[0017] ③The improved scheme is still not suitable for kerogen samples with higher maturity, and it is also possible that the same type of organic matter samples are divided into different types at different maturity stages

[0021] ① The principle of this scheme is the same as the elemental composition classification of kerogen, so it has the same disadvantages

It is artificially divided into several discrete types, making the evaluation results of kerogen types sometimes unable to accurately and rigorously guide oil and gas resource evaluation and exploration under complex geological conditions

[0025] ②In the current classification scheme, the classification parameters used are all the parameters after the evolution of kerogen, and the classification results are largely affected by the evolution degree of kerogen in the sample

Especially in the element composition classification and pyrolysis parameter classification scheme, when the sample maturity is low, the scheme can distinguish different types of kerogen, but when the sample maturity is high, the sample points of different types of kerogen are mixed in the figure Distributed together, it is difficult to distinguish accurately, and the classification results are seriously affected by human factors

[0026] ③The current classification scheme cannot reflect the essence of the conversion of kerogen to oil and gas

In this way, the kerogen classification results cannot reflect the hydrocarbon generation potential of kerogen, the meaning of the classification results is not clear, and the problem of poor guidance for actual production

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