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A method and system for measuring reservoir pore structure of tight oil and gas reservoirs

A pore structure, oil and gas reservoir technology, applied in the field of reservoir pore structure measurement system, can solve the problem of destroying pore structure and so on

Inactive Publication Date: 2016-03-30
PEKING UNIV
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  • Description
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Problems solved by technology

[0004] The current conventional methods to study the pore structure of unconventional gas reservoirs have limitations. For example, mercury cannot enter pores with a diameter smaller than 3nm in unconventional gas reservoirs in the mercury porosimetry. The possibility of destroying the pore structure

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  • A method and system for measuring reservoir pore structure of tight oil and gas reservoirs
  • A method and system for measuring reservoir pore structure of tight oil and gas reservoirs
  • A method and system for measuring reservoir pore structure of tight oil and gas reservoirs

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Embodiment Construction

[0081] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0082] This application describes the pore structure characteristics of three rock samples (layered sandstone and thick-bed sandstone) taken from different lithologies of tight oil and gas reservoirs. The core section of the sample is 17.5m long, and a systematic core description and permeability were done before sampling. Rate measurement and flow cell analysis. This application compares N 2 and CO 2 Experimental results of adsorption method, helium porosity method and USANS (ultra-small-angle neutron scattering) / SANS (small-angle neutron scattering) method, and the application of USANS / SANS technology in tight gas reservoirs.

[0083] The permeability of the 17.5 m core section was measured at approx...

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Abstract

The invention provides a measuring method for reservoir pore structure of compact oil and gas reservoir. The measuring method comprises steps: core characteristics of a compact oil and gas reservoir sample are obtained; the scattering length density of the compact oil and gas reservoir sample is calculated through the core characteristics of the sample; the scattering intensity of the sample is calculated through scattering length density; the pore superficial area of the sample is calculated through the scattering intensity; the total pore volume of the sample is calculated through the pore superficial area. The reservoir pore structure of the compact oil and gas reservoir is measured through SANS / USANS, The trends of the result and the pore size distribution curves of the N2 adsorption experiment are consistent. Low pressure adsorption experiments show that the content of micropores is low, and show existence of micron-size pores, and the pores are not communicated. The measuring precision is high, and the measuring accuracy is high.

Description

technical field [0001] The present application relates to the technical field of oil and gas field exploration and development, in particular to a method for measuring the reservoir pore structure of tight oil and gas reservoirs, and a system for measuring the reservoir pore structure of tight oil and gas reservoirs. Background technique [0002] With the continuous development of oil and gas exploration and development, the existence of unconventional oil and gas has broken the traditional theory and thinking mode of oil and gas accumulation, and has shown great potential under the existing economic and technological conditions. Unconventional oil and gas include tight gas, shale gas, coalbed methane, tight oil, shale oil and oil sands. Tight oil is the abbreviation of tight reservoir oil, and generally refers to tight sandstone, tight carbonate rock, tight volcanic rock, tight metamorphic rock, etc. that are interbedded with or closely adjacent to oil-generating rocks and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 师永民张玉广王磊师巍锋徐蕾师翔郭馨蔚师俊峰熊文涛师春爱吴洛菲方媛媛刘乐盛英帅杜书恒师锋吴文娟秦小双李晓敏柴智
Owner PEKING UNIV
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