A method of integrating multi-source observation data to finely describe heavy non-aqueous pollution sites

A technology of heavy non-aqueous phase and observation data, which is applied in the direction of electric/magnetic detection, measurement device, earthwork drilling and production for logging records, etc., and can solve the problem of limited observation holes, turbulence of dissolved tracers, etc. problem, to achieve the effect of increasing the permeability and improving the estimation accuracy

Active Publication Date: 2021-09-28
NANJING UNIV
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Problems solved by technology

[0006] Purpose of the invention: In order to overcome the limitation of observation holes and ignore the space of the saturation of heavy non-aqueous liquid (DNAPL) in the process of estimating the structure of heavy non-aqueous phase liquid (DNAPL) pollution source area by hydraulic / fraction tracer chromatography (HPTT) The influence of the distribution on the water head data, the disturbing effect of the dissolved tracer, etc., the present invention proposes a method of fusing multi-source observation data to finely describe heavy non-aqueous phase polluted sites, by establishing a coupled multiphase flow model A cyclic iterative joint inversion framework with electrical resistivity tomography (ERT) models to improve the fine characterization of permeability and heavy non-aqueous phase liquid (DNAPL) pollution sources

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  • A method of integrating multi-source observation data to finely describe heavy non-aqueous pollution sites
  • A method of integrating multi-source observation data to finely describe heavy non-aqueous pollution sites
  • A method of integrating multi-source observation data to finely describe heavy non-aqueous pollution sites

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Such as figure 1 As shown, in order to consider the influence of permeability on the spatial distribution of heavy non-aqueous phase liquid (DNAPL) saturation, the present invention proposes a method of fusing multi-source observation data to finely describe heavy non-aqueous phase polluted sites, which is divided into five stages Do the inversion:

[0030] Phase 1: Hydrodynamic tomography (HT) test is carried out on the contaminated site, the same wellbore is divided into many vertical well sections with water stoppers, water is pumped or injected in different well sections of different wellbores in sequence, and water is injected in other wells By monitoring the water level response in each section, a series of continuous intersecting hole...

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Abstract

The invention discloses a method for finely describing heavy non-aqueous phase polluted sites by fusing multi-source observation data. Based on the cyclic iterative method of ensemble Kalman filtering, the prior information of saturation of heavy non-aqueous phase liquid (DNAPL) is fully considered for water head data. The impact of heavy non-aqueous phase liquid (DNAPL) pollution source estimation accuracy is improved, the present invention establishes a coupling hydrogeophysical inversion framework, the heavy non-aqueous phase liquid (DNAPL) multiphase flow model and resistivity tomography (ERT) model coupling, which combines multi-source observation data such as water head, tracer concentration, and resistivity, significantly improves the degree of fine characterization of the heterogeneous distribution of aquifers and the structure of heavy non-aqueous liquid (DNAPL) pollution source areas.

Description

technical field [0001] The invention belongs to the technical field of pollution source identification in the field of hydrogeology, and in particular relates to a method for finely describing heavy non-aqueous phase polluted sites by fusing multi-source observation data. Background technique [0002] Heavy non-aqueous phase liquid (DNAPL) contamination is prevalent around the world. Once leaked into the ground, the high density, low interfacial tension, and low viscosity properties of heavy non-aqueous phase liquids (DNAPL) make them difficult to remove and lead to them becoming a long-term source of groundwater pollution. When DNAPL is released into the subsurface, DNAPL becomes trapped in pores forming discontinuous discrete or pooled DNAPL above regions of low permeability . The spatial distribution of heavy non-aqueous phase liquids (DNAPL) in subsurface media is affected by the heterogeneity of the permeability coefficient, and a detailed description of subsurface aq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/18G01V3/38E21B47/11E21B49/00
CPCE21B49/00G01V3/18G01V3/38
Inventor 施小清郭琼泽徐红霞孙媛媛吴吉春许伟伟任静华
Owner NANJING UNIV
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