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Method for assessing classification standard of tight reservoir pore structure based on nuclear magnetic resonance

A technology of nuclear magnetic resonance and tight reservoirs, which is applied in suspension and porous material analysis, permeability/surface area analysis, measurement devices, etc., can solve the problems of high specific gravity of secondary pores, complex pore structure, low water flooding recovery, etc. problem, achieve accurate and scientific reservoir type, and improve the effect of accuracy

Pending Publication Date: 2019-08-23
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0003] Tight sandstone reservoirs are characterized by small pores, small primary pores and high proportion of secondary pores, developed micro-fractures, and complex pore structures, which make their waterflooding development difficult and the recovery efficiency of waterflooding is low
At present, the division of tight reservoir microscopic pore structure classification standards is usually only based on reservoir characteristics (including reservoir genesis, petrological characteristics, and sedimentary microequalities), physical properties (porosity, permeability), pore-throat combination, and pore type. However, it is not perfect to evaluate the pore structure of tight reservoirs based on the above methods and related parameters.

Method used

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  • Method for assessing classification standard of tight reservoir pore structure based on nuclear magnetic resonance
  • Method for assessing classification standard of tight reservoir pore structure based on nuclear magnetic resonance
  • Method for assessing classification standard of tight reservoir pore structure based on nuclear magnetic resonance

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Embodiment 1

[0030] Jiyuan Oilfield is located in the west of the Ordos Basin, straddling the Yishan Slope and Tianhuan Depression. The Triassic Yanchang Formation is divided into 10 oil-layer groups from top to bottom. Among them, the Chang 8 oil-layer group in the study area is relatively developed and is the main force of exploration and development. Reservoir group. Due to the compaction and diagenesis of the reservoir during the deposition process, the target reservoir rock is dense and has a large number of micro- and nano-scale pore throats, with an average porosity of 7.22% and an average permeability of 0.11×10 -3 μm 2 , belonging to tight sandstone reservoirs. The complex pore structure characteristics further complicate the seepage and distribution characteristics of fluids in the pore throats, which directly restricts the exploration and development of the Chang 8 oil layer group.

[0031] The invention is used to study the microscopic pore structure of the Chang 8 oil layer ...

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Abstract

The invention discloses a method for assessing a classification standard of a tight reservoir pore structure based on nuclear magnetic resonance. The method comprises the following steps of 1, measuring the porosity and permeability of each rock center; 2, measuring the displacement pressure, mid-value pressure, sorting coefficient, pore throat radius and maximum mercury saturability of each rockcenter; 3, analyzing the petrologic feature of each rock center, and the pore throat combination and pore type of the rock center; 4, testing the movable fluid saturation and the movable fluid porosity parameter of each rock center; and 5, based on the abovementioned parameters, dividing the rock centers into I, II and III three types according to the good, middle and bad comprehensive assessmentof reservoirs, and building a classification assessment standard of the three kinds of reservoirs. The invention firstly provides the method for assessing the classification standard of the tight reservoir pore structure based on nuclear magnetic resonance; the reservoir types divided by the method are more accurate and scientific, and the basis is provided for subsequent exploration and development of the tight reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a method for evaluating the pore structure classification standard of tight reservoirs based on nuclear magnetic resonance technology. Background technique [0002] In recent years, with the decrease of conventional oil and gas resources, the exploration and development of unconventional energy, especially tight oil and gas, has been increased worldwide. Tight oil and gas account for a large proportion of my country's oil and gas composition, and improving the development effect of tight oil and gas reservoirs is of great significance to ensure national energy security. [0003] Tight sandstone reservoirs are characterized by small pores, small primary and secondary pores, high proportion of secondary pores, well-developed micro-fractures, and complex pore structures, which make it difficult to develop by water flooding and low recovery by water flooding. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 黄兴高辉张明窦亮彬屈乐薛俊杰
Owner XI'AN PETROLEUM UNIVERSITY
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