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Method for realizing oil-gas detection by applying long-offset distance transient electromagnetic array method

A transient electromagnetic and oil and gas detection technology, which is applied in the fields of electrical/magnetic detection, electrical/magnetic exploration, and radio wave measurement systems for logging records. It can reduce non-uniqueness, improve curve quality, and achieve good accuracy.

Inactive Publication Date: 2011-05-11
中石化石油工程技术服务有限公司
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Problems solved by technology

There are two reasons: one is that the electromagnetic method works at a higher frequency, and the model assumptions still have theoretical flaws; the other is that the non-uniqueness of the solution is caused by nonlinear problems in the forward and inversion process
However, for the ATEM method, since it works in the time domain and only measures the secondary field, the observation time is long after the power is turned off, so it is easy to extract the induced electric spectrum

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  • Method for realizing oil-gas detection by applying long-offset distance transient electromagnetic array method
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  • Method for realizing oil-gas detection by applying long-offset distance transient electromagnetic array method

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[0042] The selected test area is the heavy oil block of Guang 3 Member of Tankou Oilfield. Tankou Oilfield is located in Zhangxin Township, Wangchang Town, Qianjiang City, Hubei Province, and its structural location is located in the middle section of Qianbei Fault Zone in the northern part of Qianjiang Sag, Jianghan Basin. The heavy oil area of ​​the third member of Guangxi is mainly distributed in the Tan 34 well area and its outer edge in the Tankou Oilfield, which is a structural layered heavy oil reservoir with gas cap gas. The Qianjiang Formation in the Well Tan 34 area is unconformable with the third member of the Guanghuasi Formation at an angle. The oil and gas in the Qianjiang Formation escaped upward through the denudation surface and accumulated in the conglomerate at the bottom of the Guanghuasi Formation, forming the current Tankou Canton Formation. Three stages of heavy oil. The buried depth of the reservoir is only 620.2-625.2m. The oilfield is characterized ...

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Abstract

The invention relates to a method for realizing oil-gas detection by applying a long-offset distance transient electromagnetic array method. The method comprises the following steps: firstly, carrying out ATEM (analytical transmission electron microscopy) observation on a detection region to acquire data; selecting measuring points without obvious distortion or negative anomaly of electric field components while an induced polarization field is not stripped, utilizing the ATEM data for inversion, and acquiring a high-resolution lamellar specific resistance model in a detection region; then carrying out ATEM forward operation to obtain transient induced electric field or magnetic field attenuation curves of all the measuring points in the detection region; substracting the electric field or magnetic field component attenuation curve acquired during forward operation by the actually observed ATEM electric field or magnetic field component attenuation curve at the same observation time point to obtain a time domain induced polarization spectrum; applying a time domain induced polarization method for inversion to obtain the polarizability of an underground medium; and carrying out detection and evaluation on an oil-gas reservoir by utilizing the specific resistance and polarizability parameters. According to the invention, the accuracy and reliability of exploration on the oil-gasreservoir by utilizing an electromagnetic method are greatly enhanced, the working efficiency is improved, and the exploration cost is lowered.

Description

technical field [0001] The invention relates to a method for obtaining time-domain IP spectrum from long-offset transient electromagnetic array method (ATEM) observation data and then detecting oil and gas. Background technique [0002] In oil and gas geological exploration, whether the electromagnetic method is based on the resistivity parameter or the IP method is based on the polarizability parameter, the observed electromagnetic field signals include DC field, induction field and excited polarization field. Obviously, the excited polarization field in the electromagnetic method is an interference field, and the induction field in the induced electricity method is an interference field. How to separate the induced field and the excited polarization field is an important guarantee to improve the interpretation accuracy of the method. [0003] At the end of the last century, the complex resistivity method (CR) developed in the IP measurement mainly observes the induced ele...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/26G01V3/38
Inventor 严良俊陈孝雄苏朱刘黄飞胡文宝王友胜陈清礼唐新功谢兴兵向葵
Owner 中石化石油工程技术服务有限公司
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