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Method for calibrating electric resistance curve of ash-containing geological formation

A curve correction and resistivity technology, applied in the field of geophysical exploration, can solve the problem of not taking into account, and achieve the effect of convenient acquisition

Inactive Publication Date: 2018-12-21
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0006] The above-mentioned scholars have used specific methods to correct the gray matter content, and there are also examples of using multiple logging curves to calculate the gray matter content, but the resistivity curve sensitive to gray matter is not taken into account

Method used

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  • Method for calibrating electric resistance curve of ash-containing geological formation
  • Method for calibrating electric resistance curve of ash-containing geological formation
  • Method for calibrating electric resistance curve of ash-containing geological formation

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Embodiment 1

[0039] A method for correcting resistivity curves of gray strata, comprising the following steps:

[0040] S10. First, use the thin section analysis data and the response value of the log curve which is more sensitive to gray matter response to establish a corresponding mathematical model to calculate the gray matter content:

[0041] ① Select the logging curve that is more sensitive to gray matter response:

[0042] According to the logging response characteristics of calcium-bearing reservoirs (such as figure 1 shown), as the gray matter content of the reservoir increases, the resistivity logging value increases, and the acoustic time difference logging value is relatively low, so the acoustic time difference (AC) and deep lateral resistivity (RT) curves are selected as the curves reflecting the gray matter content. sensitive curve.

[0043] ② Calculate the gray matter content of the reservoir:

[0044] The correlation between thin section analysis test data (VCa) and aco...

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Abstract

The invention discloses a method for calibrating electric resistance curve of ash-containing geological formation, comprising the steps of: constructing a corresponding mathematical model by using sheet analysis data and log response value sensitive to a ash matter to calculate the ash matter content; and then analyzing the intersection diagram of the ash matter content obtained from rock core analysis and the multiplying factor of the increased logRT; establishing the calibrated electric resistance to ash matter content model by regression analysis, and correcting the resistivity to ash matter. The method for calibrating the electric resistance curve of the ash-containing geological formation of the present invention uses the curve of ash matter content from rock core analysis over electric resistance of to establish a model to obtain the ash matter content, and reasonably establishes the model and corrects the electric resistance according to the characteristics of complex sandy conglomerate and logging response characteristics.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, in particular to a method for correcting resistivity curves of gray strata. Background technique [0002] The size of rock resistivity is the result of the comprehensive influence of many factors such as the resistivity of rock minerals, mineral content distribution, water saturation, porosity, formation water salinity, and temperature. Generally, rock skeleton minerals are non-conductive, and the conductive material is mainly formation water, while the conduction pathways are mainly pores and pore-throat channels. [0003] In clastic rock reservoirs, the lime matter mostly exists in the form of calcareous cement, which has high resistivity and is easy to block the pore-throat channels. The measured resistivity is generally higher than the true resistivity of the formation, and it is difficult to effectively reflect the The reality of sex. [0004] Calcareous reservoirs are easy to identi...

Claims

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Application Information

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IPC IPC(8): G01V3/38G01N27/04
CPCG01N27/041G01V3/38
Inventor 赵军覃建华曹刚王英伟李维袁松珊王菲菲
Owner SOUTHWEST PETROLEUM UNIV
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