Inherited pore identification method in dolomite

An identification method and pore technology, which is applied to the analysis of suspensions and porous materials, measuring devices, instruments, etc., can solve the problems of increasing potential risks, failing to observe details, and different understandings obtained by different personnel, so as to achieve the effect of accurate identification

Pending Publication Date: 2021-01-29
PETROCHINA CO LTD
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Problems solved by technology

However, petrological analysis is inevitably affected by subjective factors such as the researcher's knowledge background, academic preference, and work experience, which leads to different understandings of different personnel, even for the same sample.
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  • Inherited pore identification method in dolomite
  • Inherited pore identification method in dolomite
  • Inherited pore identification method in dolomite

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Embodiment 1

[0046] This embodiment provides a method for identifying inherited pores in dolomite, which is used to identify inherited pores in Permian dolomite samples in the Sichuan Basin; the method specifically includes the following steps (the flow process is as follows: figure 1 shown):

[0047] Step 1: Collect dolomite samples with cement on the pore walls;

[0048] Such as figure 2 As shown, the sample can be distinguished by the naked eye as composed of dark dolomite in surrounding rocks and white cement dolomite crystals in the pores.

[0049] Step 2: Use a scanning electron microscope to observe the collected dolomite samples to analyze the stage and type of cement in the pores; select the samples filled with the earliest stage of dolomite cement in the pores and the surrounding rock is dolomite for subsequent steps ;

[0050] Specifically, small pieces of samples were separated from the collected dolomite samples, observed and photographed with a scanning electron microscop...

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Abstract

The invention provides a method for identifying inherited pores in dolomite. The method comprises the following steps: obtaining a dolomite sample for isotope dating, wherein the dolomite sample for isotope dating simultaneously contains dolomite surrounding rock and an earliest-stage dolomite cementing material loaded in pores and alteration does not occur; delineating dolomite surrounding rock in the dolomite sample for isotope dating and the earliest-stage dolomite cement loaded in the pores, and performing isotope dating to obtain the age of the dolomite surrounding rock and the age of theearliest-stage dolomite cement loaded in the pores; and if the age difference between the dolomite surrounding rock and the dolomite cement loaded in the pores at the earliest stage does not exceed the age difference threshold value, judging that the pores of the dolomite are inherited pores. According to the method, through the objective comparison of ages of surrounding rock dolomite and cementdolomite, a quantitative means is provided for the identification of inherited pores in dolomite.

Description

technical field [0001] The invention belongs to the technical field of rock analysis, in particular to a method for identifying inherited pores in dolomite. Background technique [0002] The identification of the genesis of dolomite pores has important guiding significance for oil and gas exploration. Under deep burial conditions, dolomite generally has a higher porosity than limestone, making it an important hydrocarbon reservoir (Ehrenberg and Nadeau, 2005). Most of the dolomite in geological history was formed by the replacement of limestone by dolomitization fluid, a process called dolomitization. Theoretically speaking, the storage space (pore) of dolomite can be formed in multiple stages such as before dolomitization (that is, the inherited type pore referred to in the present invention), during dolomitization process or after dolomitization (Lucia, 2004). Pores formed in different stages lead to different reservoir scales and spatial distribution forms, and differe...

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Application Information

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IPC IPC(8): G01N15/08G01N27/626
CPCG01N15/088G01N27/628
Inventor 潘立银梁峰胡安平沈安江
Owner PETROCHINA CO LTD
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