Experimental method of organic acid generation and erosion effect of organic acid on tight oil reservoir

Abstract

The invention discloses an experimental method of organic acid generation and an erosion effect of the organic acid on a tight oil reservoir. The experimental contents include (1) a hot simulation experiment for proportioning kerogen and a clay mineral to form a sample and generating an organic acid; (2) a hot simulation experiment for generating the organic acid by virtue of thermal evolution of shale; (3) a hot simulation experiment for the erosion effect of the organic acid on tight sandstone and monomineral; and (4) a hot simulation experiment for artificially proportioning the sample. The mechanism and influence factors of the development of the tight reservoir, especially erosion pores of the shale reservoir can be clarified by analyzing the experimental data, and a dynamics model of the organic acid generation and a thermodynamic model of the decarboxylation and erosion reaction of the organic acid can be established; the geological application can be realized by combining the models with the sedimentary and burial history, thermal history and mineral association characteristics of the reservoir in a research area, the development situation of a secondary erosion pore in different geologic periods can be quantitatively evaluated, and a foundation can be set for predicting a tight oil exploration sweet spot area.

Description

technical field [0001] The present invention relates to an experimental method for the generation of organic acids and their dissolution effects on tight oil reservoirs, in particular to an experimental method for quantitatively characterizing the generation of organic acids in the thermal evolution process of shale and their dissolution effects on tight oil reservoirs . Background technique [0002] Exploration practices and experimental studies have confirmed that the successful exploration of tight sandstone oil has common dissolution phenomena, and the dissolution pores are the main storage space for tight oil (Wang Furong et al., 2006; Kuliman et al., 2007; Lei Bianjun et al., 2008; Wang Yanzhong et al., 2010; Zhang Fugui et al., 2010; Jia Chengzao et al., 2012). For tight oil in shale reservoirs, the degree of exploration is still low, and there are few studies on the relationship between dissolved pores and oiliness. At present, the exploration and development proces...

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Problems solved by technology

[0003] In addition, the current research on the generation of organic acids mainly focuses on the types of organic acids generated (Kharaka et al., 1993; Chen Chuanping, 1994, 1995; Cai Chunfang et al. 1997), the yield (Carothers et al., 1978; Fisher , 1987; Barth et al, 1992; Chen Chuanping, 1994; Huang Futang et al., 1995; Yuan Peifang et al., 1996; Lu Huanyong et al., 1996; ; Zeng Jihui et al., 2007; Zhang Yongwang et al., 2009) and reaction mechanism (Carothers et al., 1978; Chen Chuanping, 1995; Zhang Yongwang et al., 2009), and the corresponding numerical simulation studies are almost unavailable According to literature reports, this makes it difficult to carry out quantitative characterization of organic acid yield and corresponding dissolution in geological time

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