Prediction method of physical properties of underground biodegradable thickened oil

Abstract

The invention provides a prediction method of the physical properties of underground biodegradable thickened oil. The method comprises the steps that 1, selecting crude oil samples, extracting molecular biomarkers to carry out quantitative test analyses and comparison, and then judging biodegradation degree of crude oil; 2, screening sensitive molecule biomarker maturity parameters with high biodegradation resistance; 3, building a quantitative relationship model between the biomarker parameters and crude oil physical properties. For the crude oil from the same source rock, thermal maturity is a main determiner influencing the chemical composition and physical properties of the crude oil. According to an oil deposit geochemical principle, the molecule biomarker maturity parameters can well reflect minute maturity changes among oil deposits, while the physical properties of the underground crude oil is controlled by the thermal maturity to a great degree. Therefore the biomarker maturity parameters not influenced by biodegradation are screened to build the relationship model with the physical properties of biodegradable crude oil, thus predicting the physical properties of the underground biodegradable thickened oil.

Description

Technical field [0001] The invention belongs to the field of crude oil detection, and relates to a method for predicting the physical properties of underground biodegradable heavy oil, in particular to a method for predicting the physical properties of underground biodegradable heavy oil by using molecular biomarker maturity parameters. Background technique [0002] In heavy oil exploration, crude oil physical properties are an important parameter. On the one hand, the physical properties of crude oil will affect the economic cost and exploration risk of exploration, thereby affecting the exploration strategy; on the other hand, the physical properties of crude oil actually measured on the ground often cannot represent the true underground situation, and people often come from the physical properties of crude oil measured on the ground. Infer the migration direction, migration path and accumulation law of crude oil. For example, the Fengcheng Oilfield in the Junggar Basin is a r...

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Problems solved by technology

The biodegradation process revealed by research in recent years seems to be more complex: in the process of crude oil biodegradation, the consumption of different series of compounds may occur simultaneously, rather than a simple sequential or progressive process (Larter et al., 2003, 2006; Bennett&Larter, 2008; Bennett et al., 2013; López et al., 2014), or that bacteria may preferentially consume the dominant components in crude oil (Bao Jianping, 2007; Zhang Qu et al., 2007)

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