Method for detecting optimal reservoir in clastic rock reservoir containing chlorite

A detection method, chlorite technology, applied in the direction of measuring devices, suspension and porous material analysis, instruments, etc., can solve problems such as single method and large error, and achieve accurate characterization results, accurate judgment, and relatively simple avoidance methods Effect

Active Publication Date: 2021-05-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] At present, the research on the influence of authigenic chlorite on reservoirs is mainly based on conventional reservoirs, but with the development of oil and gas exploration and development and the continuous improvement of technology, the proportion of tight oil and gas continues to increase, especially for tight clastics. Rock reservoirs are increasingly becoming one of the key points of mining. For tight clastic rock reservoirs, micro-nano-scale pore throats are a very important part of pores. One of the key factors for the final development effect, there is no method to judge the optimal reservoir by using the influence of authigenic chlorite on the microscopic pore structure of the tight clastic rock reservoir, so the method used in the process of judging the optimal reservoir The method is relatively simple, and the error is relatively large

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  • Method for detecting optimal reservoir in clastic rock reservoir containing chlorite
  • Method for detecting optimal reservoir in clastic rock reservoir containing chlorite
  • Method for detecting optimal reservoir in clastic rock reservoir containing chlorite

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Embodiment 1

[0037] 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:

[0038] 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;

[0039] Measure the porosity and permeability of the collected core plug samples. Before measuring the porosity and permeability, the core plug samples are deoiled with ethanol benzene compound, usin...

Embodiment 2

[0057] 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

[0058] 1. Sample test

[0059] 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.

[0060] 2. Through optical observation and scanning electron microscope observation, chlorite has three occurrence states in the study area:

[0061] (1) Granular coated chlo...

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Abstract

The invention discloses a method for detecting an optimal reservoir in chlorite-containing clastic rock reservoirs, which mainly comprises the following steps: step 1, collecting a plurality of core plunger samples, measuring the porosity and permeability of the core plunger samples, and screening out the core plunger samples with the permeability greater than 0.1 as preliminary samples; 2, sampling the preliminary sample, observing the occurrence state of chlorite in the preliminary sample by using a microscope, and screening out an intermediate sample with well developed chlorite; 3, sampling the intermediate sample, carrying out an X-diffraction experiment, and determining the chlorite content according to a measured X-diffraction value; and 4, according to the position of the chlorite content in the chlorite content-pore relational graph, selecting the chlorite content corresponding to the optimal pore as the optimal content, and selecting the reservoir in which the core plunger sample corresponding to the optimal content is located as the optimal reservoir. The method is simple and feasible, and the characterization result is more accurate.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a method for detecting an optimal reservoir in clastic rock reservoirs containing chlorite. Background technique [0002] Authigenic chlorite is a common diagenetic mineral in clastic rock reservoirs. Its content, production state, and spatial-temporal distribution are of great significance to the preservation of primary pores in reservoirs. research hotspot. [0003] At present, the research on the influence of authigenic chlorite on reservoirs is mainly based on conventional reservoirs, but with the development of oil and gas exploration and development and the continuous improvement of technology, the proportion of tight oil and gas continues to increase, especially for tight clastics. Rock reservoirs are increasingly becoming one of the key points of mining. For tight clastic rock reservoirs, micro-nano-scale pore throats are a very important part of pores. One of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N21/84G01N23/2251G01N23/207
CPCG01N15/0826G01N15/088G01N21/84G01N23/2251G01N23/207
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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