Method for evaluating influence of tight reservoir micro-pore structure features on effects of displacement of oil by water

A technology for microscopic pores and tight reservoirs, which is used in suspension and porous material analysis, measurement devices, scientific instruments, etc. , the effect of improving the accuracy

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

[0004] 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

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  • Method for evaluating influence of tight reservoir micro-pore structure features on effects of displacement of oil by water
  • Method for evaluating influence of tight reservoir micro-pore structure features on effects of displacement of oil by water
  • Method for evaluating influence of tight reservoir micro-pore structure features on effects of displacement of oil by water

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Embodiment 1

[0053] Jiyuan Oilfield is located in the western Ordos Basin, straddling the Yishan Slope and Tianhuan Depression. The Triassic Yanchang Formation is divided into 10 oil layer groups from top to bottom. The Chang 8 oil layer group in the study area is relatively well-developed and is the main force of exploration and development. Oil layer group. Due to the compaction and diagenesis of the reservoir during the deposition process, the target reservoir rock is compact 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 , Belongs to tight sandstone reservoir. The complex pore structure features further complicate the fluid seepage and distribution characteristics in the pore throats, directly restricting the exploration and development of the Chang 8 reservoir.

[0054] The present invention is used to study the microscopic pore structure of the Chang 8 oil layer group in Jiyuan Oilfield, and ...

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Abstract

The invention provides a method for evaluating the influence of tight reservoir micro-pore structure features on the effects of displacement of oil by water. The method comprises the following steps:1) establishing a tight reservoir micro-pore structure classification standard; 2) making micro models based on classified tight reservoirs; 3) performing an experiment of displacement of oil by wateron each micro model; 4) obtaining the effects of displacement of oil by water corresponding to different types of reservoirs. According to the method provided by the invention, a movable fluid parameter of a tight reservoir sample is measured by using the nuclear magnetic resonance technology, and the micro-pore structure of a tight sandstone reservoir is studied in combination with casting bodythin section analysis, scanning electron microscope, high pressure mercury injection and other experimental results, a micro-pore structure classification standard of the target reservoirs is established, the experiment of displacement of oil by water is performed on three types, and the relationship between the micro-pore structure features and the oil displacement efficiency has important guiding significance for the formulation and adjustment of development programs of the tight reservoirs.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to a method for evaluating the influence of the microscopic pore structure characteristics of a tight reservoir on the effect of water displacement based on nuclear magnetic resonance technology. Background technique [0002] In recent years, as conventional oil and gas resources have been declining, the world has increased the exploration and development of unconventional energy, especially tight oil and gas. Tight oil and gas occupies a large proportion of my country's oil and gas composition. Improving the development effect of tight oil and gas reservoirs is of great significance to safeguarding national energy security. [0003] The microscopic pore structure of tight sandstone reservoirs has a significant impact on the characteristics of water flooding. Tight sandstone reservoirs are characterized by small pore throats, high proportion of small primary and second...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 黄兴薛俊杰雷博曹杰王琛
Owner XI'AN PETROLEUM UNIVERSITY
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