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A quantitative characterization method for different types of pore structures in tight glutenite reservoirs

A technique for quantitative characterization of pore structure, applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., which can solve the problems of low efficiency, low resolution of cast flakes and SEM images, and difficulty in characterizing small pores and other problems to achieve the effect of overcoming low efficiency

Active Publication Date: 2021-04-06
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing quantitative characterization methods of different types of pore structures in tight sandy conglomerate reservoirs have the following problems: (1) a large number of images need to be counted to obtain relatively reliable results, and the workload is large and the efficiency is low. Low; (2) The resolution of casting thin sections and SEM images is low, and it is difficult to characterize small pores (<500nm); (3) The two-dimensional surface porosity may be difficult to represent the three-dimensional pore structure

Method used

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  • A quantitative characterization method for different types of pore structures in tight glutenite reservoirs
  • A quantitative characterization method for different types of pore structures in tight glutenite reservoirs
  • A quantitative characterization method for different types of pore structures in tight glutenite reservoirs

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Embodiment 1

[0034] A quantitative characterization method for different types of pore structures in tight sandy conglomerate reservoirs, comprising the following steps:

[0035] (1) Drilling samples: According to the industry standard GB / T 29172-2012, on the full-diameter (core diameter: 12cm) core sample, select a location with a relatively uniform particle size, drill a diameter of 2.5cm, and a length between 3- 5cm standard column sample.

[0036] (2) Oil washing and drying: the rock samples were extracted and washed with a Soxhlet extraction device, and then dried in a vacuum kettle (105°C) to constant weight.

[0037] (3) Measurement parameters: measure the diameter and length of the rock sample, and calculate the sample volume v, in cm 3 , and measure the mass m of the rock sample, the unit is g, and calculate the apparent density ρ of the sample 视 , the unit is g / cm 3 ;According to the industry standard SY / T 6385-2016, using Boyle's law to measure the porosity of rock samples ...

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Abstract

The invention belongs to the field of unconventional oil and gas exploration and development, in particular to a quantitative characterization method for different types of pore structures in tight sandy conglomerate reservoirs. Through the high-pressure mercury injection experiment, the mercury injection saturation is accumulated according to the pore size from large to small, and the mercury injection curve is obtained, and then the pore diameter cut-off points of different types of pore structures are determined according to the sample mercury injection and the segmental characteristics of the fractal curve of the pore surface, and then through The porosity corresponding to different types of pore structures and the contribution of different types of pore structures to sample porosity and permeability are obtained through calculation and analysis. The present invention quantitatively characterizes different types of pore structures in tight glutenite reservoirs based on high-pressure mercury injection curves and fractal characteristics of pore surfaces, and accurately and efficiently realizes the characterization of different types of pore structures in tight glutenite reservoirs.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, in particular to a quantitative characterization method for different types of pore structures in tight sandy conglomerate reservoirs. Background technique [0002] With the widespread application of horizontal wells and large-scale hydraulic fracturing technologies, unconventional oil and gas resources represented by tight oil and gas have taken the lead in realizing commercial development in China's Ordos Basin, Songliao Basin and Tarim Basin, and have become the guarantee of my country's energy resources. The most realistic field of security. Compared with conventional sand (conglomerate) reservoirs, tight glutenite reservoirs usually experience severe compaction and cementation, and have extremely low porosity (<10%) and permeability (<1.0×10 -3 μm 2 ), the pore structure is extremely complex, and multi-scale pores are developed. Among them, nanosc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826G01N15/088
Inventor 张鲁川肖佃师卢双舫蒋恕谷美维李勃张倩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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