Saturation modeling method with equivalent J function constraint

A modeling method and saturation technology, applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc., can solve the problem of inability to achieve balanced distribution of saturation data, large workload, and poor saturation model accuracy, etc. problems, to achieve the effect of reducing model adjustment work, high model accuracy, and achieving vertical balanced distribution

CN111550238AActive Publication Date: 2020-08-18PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-08-18

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Abstract

The invention discloses a saturation modeling method with equivalent J function constraint. The saturation modeling method with the equivalent J function constraint comprises the following steps of 1)establishing a sedimentary microfacies model, a porosity model and a permeability model of a target work area; 2) establishing a height model above an oil-water interface according to the oil-water interface; 3) establishing an equivalent J function model; 4) generating a height logging curve above the oil-water interface of each single well in the target working area; 5) generating an equivalentvariable curve of different sedimentary facies; 6) establishing an intersection graph of the equivalent variable curve and a logging water saturation curve under different sedimentary facies conditions, and establishing a linear fitting distribution function; 7) converting the equivalent J function model generated in the step 3) into a fitted water saturation geological model; 8) establishing anoil-containing boundary model; and 9) obtaining a water saturation model after boundary constraint, further obtaining an oil saturation model of the target work area, and obtaining a geological modelof the original oil saturation of the oil reservoir.
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Description

technical field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a saturation modeling method constrained by an equivalent J function. Background technique

[0002] At present, the original oil saturation initialization calculation of the reservoir model generally adopts three methods:

[0003] The first is equilibrium initialization. The model uses relative permeability curves and capillary pressure curves to calculate the distribution of initial saturation. This method requires the setting of the oil-water interface and is calculated by numerical simulation software.

[0004] The second is the enumeration method, which uses the original oil saturation value interpreted by well logging to perform interpolation calculation through geological modeling software, outputs the original oil saturation field, and directly assigns it to the numerical model.

[0005] The third method is the J function method, in which...

Examples

specific Embodiment approach

[0052]It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical contents disclosed in the present invention without affecting the functions and objectives of the present invention.

[0053] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any sub...

Embodiment 1

[0080] The invention discloses a saturation modeling method constrained by an equivalent J function, comprising the following steps:

[0081] Step 1) Establish the sedimentary microfacies model, porosity model and permeability model of the target work area;

[0082] Step 2) establish the height model above the oil-water interface according to the oil-water interface;

[0083] Step 3) establish the equivalent J function relational expression, utilize the porosity model and the permeability model that step 1) generate and the height model that step 2) generate, establish equivalent J function model;

[0084] Step 4) Utilize the height model that step 2) establishes, generate the height log curve above the oil-water contact of each single well in the target work area;

[0085] Step 5) using the height log curve generated in step 4), combined with porosity and permeability log data, according to the division of sedimentary facies, generating equivalent variable curves of differen...

Embodiment 2

[0091] The invention discloses a saturation modeling method constrained by an equivalent J function, comprising the following steps:

[0092] Step 1) Establish the sedimentary microfacies model, porosity model and permeability model of the target work area;

[0093] Step 2) establish the height model above the oil-water interface according to the oil-water interface;

[0094] Step 3) establish the equivalent J function relational expression, utilize the porosity model and the permeability model that step 1) generate and the height model that step 2) generate, establish equivalent J function model;

[0095] Step 4) Utilize the height model that step 2) establishes, generate the height log curve above the oil-water contact of each single well in the target work area;

[0096] Step 5) using the height log curve generated in step 4), combined with porosity and permeability log data, according to the division of sedimentary facies, generating equivalent variable curves of differen...