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Characterization method for micro-pores in clastic rock reservoir containing chlorite

A micro-pore and chlorite technology, which is applied in permeability/surface area analysis, suspension and porous material analysis, instruments, etc., can solve the problems of unclear influence and lack of micro-pore characterization methods, and achieves a simple and feasible method. The effect of characterizing results accurately

Active Publication Date: 2021-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For tight clastic rock reservoirs, micro-nano-scale pore throats are very important components of pores, and microscopic pore structure is one of the key factors controlling the final development effect of low-permeability and ultra-low-permeability sandstone reservoirs. The influence of chlorite on the microscopic pore structure of tight clastic rock reservoirs is not yet clear, and so far there is no characterization method for the microscopic pores in clastic rock reservoirs containing chlorite.

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  • Characterization method for micro-pores in clastic rock reservoir containing chlorite
  • Characterization method for micro-pores in clastic rock reservoir containing chlorite
  • Characterization method for micro-pores in clastic rock reservoir containing chlorite

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Embodiment 1

[0034] The object of the present invention can be achieved through the following technical solutions: a method for characterization of microscopic pores in clastic rock reservoirs containing chlorite, comprising the following steps in turn:

[0035] S1: Collect a plurality of core plunger samples, the sample diameter is 2.5cm, and the length is greater than 3cm. When collecting samples, two samples are collected for each depth. One core plunger sample is composed of the two samples mentioned above. Due to the X- The amount of samples used in the diffraction experiment is relatively large, so one of them is used for experimental X-diffraction experiments, and the other is used for other experiments to reduce the influence of sample heterogeneity on microscopic experimental results;

[0036] S2: Measure the porosity and permeability of the core plug sample collected in step S1, before measuring the porosity and the permeability, use ethanolbenzene compound to deoil the core plug ...

Embodiment 2

[0050] The research area of ​​this example 2 takes the sampling of the Longfengshan sub-sag in the Changling fault depression of the Songliao Basin as an example

[0051] 1. Sample test

[0052] A total of 131 core plunger samples were collected this time. According to the characterization method in Example 1, 131 (262 pieces in total) core plunger samples were tested and analyzed. The test and analysis of degree and permeability; 131 casting thin sections were cut for optical observation, and 20 for scanning electron microscope observation; a total of 82 samples of whole-rock X-ray diffraction experiments and 38 samples of clay mineral relative content X -Ray diffraction experiment; and high-pressure mercury intrusion experiment was carried out on 29 samples in which authigenic chlorite was developed.

[0053] 2. Through optical observation and scanning electron microscope observation, chlorite has three occurrence states in the study area:

[0054] (1) Granular coated chlo...

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Abstract

A characterization method for micro-pores in a clastic rock reservoir containing chlorite relates to the technical field of oil-gas exploration and development, and comprises the following steps: S1, collecting a plurality of core plunger samples; S2, measuring the porosity and permeability of the core plunger sample, and screening out a preliminary sample; S3, sampling the preliminary sample, observing the occurrence state of chlorite in the sample I by using a microscope, and screening out an intermediate sample with well developed chlorite; S4, sampling the intermediate sample, performing an X-diffraction experiment on the sample II, and determining the chlorite content according to an X-diffraction value; S5, sampling the intermediate sample, performing a high-pressure mercury injection test on the third sample, and measuring micro-pore structure parameters of the intermediate sample; S6, obtaining loop characteristics of the porosity, the chlorite content and the micro-pore structure parameters; and S7, according to the loop characteristics, analyzing the relationship between the chlorite content and the micro-pore structure of the intermediate sample to obtain the oil and gas reservoir performance of the intermediate sample at the corresponding depth in the clastic rock reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for characterizing microscopic pores in clastic rock reservoirs containing chlorite. Background technique [0002] Authigenic chlorite is a common diagenetic mineral in clastic rock reservoirs, and its content, production state, and spatial-temporal distribution are of great significance to the preservation of primary pores in reservoirs. The influence of authigenic chlorite on reservoirs has always been a research hotspot at home and abroad. As early as the 1950s, when Heald was studying authigenic minerals in West Virginia sandstone, he noticed the authigenic growth around clastic grains or secondary growth of quartz. chlorite ring, and pointed out that this kind of chlorite originates from the initial sediment. [0003] At present, with the progress of oil and gas exploration and development and the continuous improvement of technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826G01N15/088G01N2015/0846
Inventor 曲希玉张洋晨腊唯豪毛少华杜涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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