Evaluation method for hydrocarbon expulsion efficiency and shale oil enrichment degree of continental facies shale

Abstract

The invention provides an evaluation method for hydrocarbon expulsion efficiency and shale oil enrichment degree of continental facies shale, which comprises the following steps: acquiring a shale core sample of a shale formation, and respectively carrying out rock pyrolysis analysis and X-ray diffraction analysis; obtaining organic geochemical parameters; determining the organic matter maturity, the kerogen type and the organic matter abundance of the shale core sample; carrying out X-ray diffraction analysis to obtain mineral types; determining lithofacies and salinity according to mineral types; shale units are divided according to kerogen types, organic matter abundance, lithofacies and salinity; solving the hydrocarbon expulsion efficiency; according to the TOC and S1 parameters obtained through rock pyrolysis analysis and the hydrocarbon expulsion efficiency obtained through calculation, a geochemical profile map changing along with the depth is drawn; and predicting a shale oil enrichment section. The continental facies shale is divided into multiple shale units, fine representation of the continental facies shale is achieved, the hydrocarbon expulsion efficiency is solved through the proposed formula, and prediction of the shale oil enrichment section is achieved through the geochemical profile of TOC, S1 and HEE changing along with the depth.

Description

technical field [0001] The invention relates to the technical field of exploration and development of unconventional shale oil, in particular to an evaluation method for hydrocarbon expulsion efficiency of continental shale and shale oil enrichment degree. Background technique [0002] Shale oil is an important replacement field for increasing oil and gas reserves and production in my country, and its effective development is of great significance for ensuring national energy security. Shale oil refers to petroleum resources that exist in mud shale formations as source rocks, and is characterized by the same layer of source rocks and reservoirs. Therefore, the degree of enrichment of shale oil depends on its hydrocarbon expulsion efficiency. If a large amount of hydrocarbons generated by shale are expelled, its oiliness is often poor. Conversely, if most of the hydrocarbons generated by shale stay in the shale, the shale oil will be enriched and thus have better oil-bearing...

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Problems solved by technology

[0004] The present invention provides a method for evaluating the hydrocarbon expulsion efficiency of continental shale and the enrichment degree of shale oil, so as to solve the problems in the prior art caused by unreasonable classification of continental shale types and uncertain hydrocarbon expulsion efficiency. The degree of enrichment of shale oil cannot be accurately judged

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