Method for obtaining total organic carbon content of marine underground medium

A technology of total organic carbon content and underground medium, which is applied in geophysical measurement, measuring device, electrical/magnetic exploration, etc. It can solve the problems of small number of wells, unable to represent total organic carbon content, limited number of core samples, etc.

Active Publication Date: 2015-11-11
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

[0003] Total organic carbon content (TOC) information can be used to distinguish high-resistivity formations (such as volcanic rocks) from oil and gas reservoirs, but the information on organic carbon content is usually obtained by analyzing core samples obtained from drilling and typical outcrop samples. The development is still in its infancy, and the number of wells drilled is generally small, so the number of core samples obtained is limited, and the organic carbon content obtained by analyzing the limited core samples can only represent a limited number of points, and cannot represent the total organic carbon content distributed on the entire plane

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  • Method for obtaining total organic carbon content of marine underground medium
  • Method for obtaining total organic carbon content of marine underground medium
  • Method for obtaining total organic carbon content of marine underground medium

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Embodiment Construction

[0050] (1) if figure 2 As shown, one or more dipole devices are arranged in the seawater 10-50m above the seabed as the emission source, and they are connected to the generator to emit alternating current with a fixed frequency (low frequency, 0.01-10Hz). One or more dipole devices can be emitted. For continuous square wave signals of several frequencies, the current peak value is generally 100-1000A; at the same time, one or more dipole devices are arranged on the seabed as receiving devices for receiving marine electromagnetic data. The distance between each receiving point is 1000m, and the distance between the receiving devices The shortest distance of the emission source is 100-500m, and the farthest can reach more than ten kilometers, depending on the depth of the research target;

[0051] (2) Use the ship to drag the electric dipole emission source from a starting point along the survey line to the end point, and complete the data collection of a frequency of marine co...

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Abstract

The invention discloses a method for obtaining the total organic carbon content of a marine underground medium. The method includes the following steps that: Occam inversion calculation is performed on acquired electromagnetic field data in an exploration region, so that the resistivity of the exploration region can be obtained; after the resistivity information is converted into complex resistivity through a Cole-Cole model, Occam inversion calculation is performed on the complex resistivity, so that polarization rate can be obtained; and the total organic carbon content information of the exploration region is obtained through utilizing the positive correlation between the polarization rate and the total organic carbon content. Compared with the prior art, and with the method of the invention adopted, the distribution rule of the organic carbon content in a plane can be obtained without well drilling required, and the method is of great significance for predicting gas bearing formations, guiding offshore oil and gas exploration and improving the success rate of misering and development.

Description

technical field [0001] The invention relates to an ocean controllable source electromagnetic prospecting method, in particular to a method for obtaining total organic carbon content in ocean underground media. Background technique [0002] Marine Controlled Source Electromagnetic Method (MCSEM) can effectively reflect the physical properties of fluid in structural traps, and has gained widespread attention in the field of marine oil and gas exploration. The emission source of this method adopts a horizontal electric dipole source, which is arranged in water at a height of tens of meters above the seabed. The receiving device is arranged on the seabed to measure the electric field value and magnetic field value. The receiving device includes two horizontal electric dipoles, one vertical electric dipole, magnetometer, sound control instrument and recorder, etc. In this method, the collected field value information is inverted by the controllable source electromagnetic method ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCY02A90/30
Inventor 王绪本何展翔余刚孙卫斌张兵赵宁
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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