A Method of Correcting Overburden Physical Properties of Shale Reservoirs

Abstract

The invention provides a method for correcting an overburden pressure physical property of a shale reservoir. The method belongs to the field of petroleum and natural gas exploration. The method is based on a reservoir rock core overburden pressure test. Through analyzing a relationship and a role between a physical property change after an overburden pressure is applied on the rock core and an overburden pressure change, a reservoir physical property overburden pressure correction model is established, namely a reservoir porosity overburden pressure correction model and a reservoir permeability overburden pressure correction moduel. The method comprises the following steps of (1) performing a rock core overburden pressure testing, and obtaining a testing result; (2) establishing a rock core physical property overburden pressure correction model, namely analyzing a change relationship between a rock core overburden pressure physical property and the overburden pressure according to the testing result of the step (1), and establishing a relationship model between the overburden pressure physical property and the overburden pressure in each rock core sample; and (3) establishing a reservoir physical property overburden pressure correction module, namely analyzing differences among the rock core physical property overburden pressure correction models which are established in the step (2), and analyzing a change rule between the difference and a routine physical property on the ground of the rock core.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration, and in particular relates to a method for correcting the overburden physical properties of shale reservoirs, which is used for the exploration of shale reservoirs in petroleum geophysics. Background technique [0002] Shale gas is an important part of the world's unconventional oil and gas resources. Shale gas resources are relatively abundant and the resource prospects are huge. North America is currently the only region in the world that has realized the commercial exploitation of shale gas. The shortage of oil and gas resources has prompted China to accelerate the development of shale gas. At present, the exploration and development of shale gas has become a hot spot in domestic oil and gas exploration. In the process of shale gas reservoir research, the core pores and permeability values ​​that directly reflect the physical properties of the reservoir are usually obtained ...

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Problems solved by technology

[0004] (1) Directly use the experimental results to perform simple data fitting and correction, without comprehensively considering the difference in reservoir physical properties and the variation law of overburden pressure

[0005] (2) For gas reservoirs with large top-to-bottom spans at buried depths, the overburden pressure is constantly changing, so it is necessary to conduct experiments for different overburden pressure values ​​to establish different calibration models during overburden pressure calibration, resulting in increased calibration errors and experimental costs

[0006] (3) The current formation experience is mainly based on the experimental basis of conventional reservoirs, but not for shale reservoirs with obvious differences in reservoir characteristics

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