Casting-body-effect-free reservoir evaluation method based on nanoparticle filling experiment

Abstract

The invention belongs to the technical field of casting-body-effect-free sandstone natural gas exploration and development, and particularly relates to a casting-body-effect-free reservoir evaluationmethod based on a nanoparticle filling experiment. According to the method, by five steps of acquiring a reservoir sample of the reservoir to be evaluated, observing reservoir space distribution of the casting-body-effect-free reservoir, determining theoretical reservoir forming possibility, verifying connectivity of the casting-body-effect-free reservoir and verifying gas bearing property and content of the casting-body-effect-free reservoir through field experiments, a casting-body-effect-free reservoir in tight sandstone is accurately evaluated, the gas connectivity is effectively evaluated, and powerful support is provided for subsequent accurate estimation of tight sandstone natural gas resource quantity, reserve submission and search exploration.

Description

technical field [0001] The invention belongs to the technical field of exploration and development of non-cast effect sandstone natural gas, and in particular relates to a method for evaluating a non-cast effect reservoir based on a nano particle charging experiment. Background technique [0002] China is very rich in tight gas resources, with a wide range of reservoir distribution and huge resource potential. It has become the focus of oil and gas exploration today, but the research is still in its infancy. Not only is it lack of effective exploration and development experience, but also the understanding of the geological characteristics of tight gas is very simple , especially in lithologic oil and gas reservoirs, affected by multiple provenances and complex paleo-drainage systems, sedimentary facies and reservoir sand bodies migrate greatly in time and space, and reservoir heterogeneity is strong. The tight sandstone reservoirs currently explored and developed are mainly ...

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Problems solved by technology

[0002] China is very rich in tight gas resources, with a wide range of reservoir distribution and huge resource potential. It has become the focus of oil and gas exploration today, but the research is still in its infancy. Not only is it lack of effective exploration and development experience, but also the understanding of the geological characteristics of tight gas is very simple , especially in lithologic oil and gas reservoirs, affected by multiple provenances and complex paleo-drainage systems, sedimentary facies and reservoir sand bodies migrate greatly in time and space, and reservoir heterogeneity is strong. The tight sandstone reservoirs currently explored and developed are mainly concentrated in 0.1 ~1mD, but at the same time there are a large number of reservoirs less than 0.1mD in the tight sandstone reservoirs, because the throats in the tight reservoirs below 0.1mD are extremely small and the permeability is extremely poor, and some samples even have difficulty in die-casting. Inject the die-casting liquid into the pores, and after the film is made, it will be found through the ordinary transmitted light polarizing microscope that the existence of the casting body can hardly be observed in the thin film, that is, the pores cannot be found. This type of reservoir is often found in tight sandstone oil and gas fields , and some wells have a certain production capacity, but currently there is no systematic and scientific method to effectively evaluate them, and the gas-bearing properties of such reservoirs cannot be accurately evaluated, which seriously restricts the accurate estimation of natural gas resources and the submission of reserves in the next step and looking for exploration to replace the field

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