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Method for tracing filling directions and paths of deep fossil oil reservoirs

A paleo-reservoir and pathway technology, applied in the field of deep paleo-reservoir charging direction and pathway tracing, can solve the problems of lack of geochemical evidence, not representative of paleo-reservoir charging direction and pathway, etc., to achieve reliable research results, Good prospecting service, better results

Inactive Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Even if there is relevant knowledge, it is judged based on geological characteristics and lacks direct geochemical evidence; or judgments are made based on the information of current natural gas reservoirs. From ancient oil reservoirs to natural gas reservoirs, they have experienced very complicated geological evolution and structure. Evolution may adjust the direction of oil and gas accumulation, so the charging direction and pathway of today's natural gas reservoirs do not represent the charging direction and pathway of ancient oil reservoirs

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  • Method for tracing filling directions and paths of deep fossil oil reservoirs
  • Method for tracing filling directions and paths of deep fossil oil reservoirs
  • Method for tracing filling directions and paths of deep fossil oil reservoirs

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with accompanying drawing.

[0042] A method for tracing the charging direction and pathway of deep paleo-reservoirs, comprising the following steps:

[0043] (1) It is determined that the bitumen and natural gas in the reservoir are the cause of the cracking and disproportionation reaction of crude oil, and there is a genetic connection between the two, such as figure 1 As shown, the steps to determine the genetic relationship between bitumen and natural gas in the reservoir are as follows:

[0044] 1. The organic origin gas has a high content of organic components such as methane and ethane, usually above 90%, and the content of non-hydrocarbon gases is low; the organic origin δ 13 C 1 light, and has δ 13 C 1 13 C 2 13 C 3 13 C 4 normal fractionation sequence; using He 3 / he 4 -He genesis identification chart and 40 Ar / 36 The Ar parameter identifies whether it is crust-derived or mantle-d...

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Abstract

The invention relates to a method for tracing filling directions and paths of deep fossil oil reservoirs. The method includes steps of determining that reservoir bitumen and natural gas are factors for decomposition and disproportionation reaction of crude oil and have genesis relationship with each other; judging in-situ decomposition factors of the fossil oil reservoirs; tracking the filling directions and paths of the fossil oil reservoirs. The method has the advantages that the filling directions and paths of the fossil oil reservoirs are traced by the aid of the reservoir bitumen according to genesis relationships between the reservoir bitumen and the fossil oil reservoirs, and accordingly the method is applicable to completely decomposed deep high-mature and post-mature fossil oil reservoirs where natural gas is formed; study on processes in which the fossil oil reservoir are developed into natural gas reservoirs can be implemented; relationships between the reservoir bitumen and the natural gas can be determined according to relationships among reservoir bitumen R<o>, the natural gas R<o> and reservoir stratums R<o>, and whether the natural gas is an in-situ decomposition factor of the fossil oil reservoirs or not can be judged; study on reservoir formation mechanisms of the deep high-mature and post-mature natural gas reservoirs can be deepened and improved, study results are reliable, and the method can effectively serve for deep natural gas exploration.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a method for tracing charging directions and paths of deep ancient oil reservoirs. Background technique [0002] Paleo-oil reservoirs formed in the early stage can also be cracked into gas during deep burial thermal evolution (Burnham, 1989; Dai Jinxing et al., 1992; Pepper, et al., 1995; Schenk, 1997; Waples, 2000; Hill et al., 2003) , which is essentially a process in which crude oil undergoes cracking and disproportionation reactions at a certain temperature to generate gaseous hydrocarbons and residues (solid bitumen) (Zhao Mengjun et al., 2000; Zhao Wenzhi et al., 2004, 2006). On the one hand, this understanding makes the formation process of oil and gas more complicated, and on the other hand, it enhances the exploration potential of cracked gas, especially for the deep oil and gas reservoirs in the Sichuan Basin in southern my co...

Claims

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Application Information

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IPC IPC(8): G01V11/00
Inventor 陈中红
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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