A method for quickly identifying favorable intervals of shale oil based on rock pyrolysis parameters

Abstract

The invention provides a method for quickly identifying favorable intervals of shale oil based on rock pyrolysis parameters, comprising: obtaining shale samples of shale formations, performing rock pyrolysis analysis and total organic carbon measurement respectively; using rock pyrolysis The analysis and measurement method obtains the first organic geochemical parameters of the shale formation; according to the highest pyrolysis peak temperature and the hydrogen index chart, determine the organic matter maturity and organic matter type of the shale sample; Take the amount of hydrocarbon expulsion; based on the amount of hydrocarbon expulsion in the low-mature-mature sample per unit mass, the shale is divided into three types: E type, M type and R type; combined with the analysis and description of different types of shale, Favorable intervals of the shale oil are determined. The invention establishes a new index for characterizing the amount of hydrocarbon expulsion of shale, realizes the prediction of shale oil-bearing property, and further defines favorable intervals for shale oil exploration.

Description

technical field [0001] The invention relates to the technical field of unconventional shale oil exploration and development, in particular to a method for quickly identifying favorable intervals of shale oil based on rock pyrolysis parameters. Background technique [0002] The oil-bearing property of shale is one of the basic parameters to understand the potential of shale oil resources, and it is also the key to in-depth study of the enrichment mechanism of shale oil. Under the limitation of current technical conditions, the recoverable target of shale oil is mainly free oil rather than adsorbed oil. Therefore, predicting and evaluating shale oil-bearing properties is an important and difficult point in shale oil exploration. [0003] At present, in domestic and foreign shale oil exploration, the oil saturation index (S 1 / TOC×100) to evaluate the resource potential of shale oil, and North American shale oil exploration practice has also confirmed that the higher the oil ...

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Problems solved by technology

[0004] The present invention provides a method for quickly identifying favorable intervals of shale oil based on rock pyrolysis parameters, so as to solve the problem of poor application effect of oil saturation index in the evaluation of my country's shale oil resource potential in the prior art and the use of hydrocarbon generation simulation experiments. Shale oil-bearing evaluation leads to high cost and long cycle

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