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Method and device for evaluating total organic carbon content in shale gas reservoir

A technology of total organic carbon content and shale reservoir, applied in the field of geophysical exploration data processing, can solve the problems of vertical and horizontal well drilling success rate not being significantly improved, low determination accuracy, etc.

Inactive Publication Date: 2014-08-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, this method is not accurate in determining the distribution of total organic carbon content or organic matter abundance in shale formations, so that the drilling success rate of vertical and horizontal wells has not been significantly improved

Method used

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  • Method and device for evaluating total organic carbon content in shale gas reservoir
  • Method and device for evaluating total organic carbon content in shale gas reservoir
  • Method and device for evaluating total organic carbon content in shale gas reservoir

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Embodiment

[0111] Such as Figure 4 Shown is the flow chart of evaluating the total organic carbon content in shale gas reservoirs in this embodiment. It mainly consists of the following specific steps:

[0112] Step 1): Acquisition of omnidirectional or wide-azimuth 3D seismic data in the survey work area or exploration area;

[0113] Step 2): Perform conventional preprocessing on the acquired omnidirectional or wide-azimuth 3D seismic data;

[0114] Step 3): Perform pre-stack static correction processing on the preprocessed omni-directional or wide-azimuth 3D seismic data;

[0115] Such as Figure 5a Shown is the stacked profile of the seismic data before pre-stack static correction processing. Such as Figure 5b Shown in is the stacked profile of the seismic data after pre-stack static correction processing. Comparison of pre-stack static correction results before and after processing shows that the seismic data without static correction shows that the reflection interface is br...

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Abstract

The invention provides a method and device for evaluating a total organic carbon content in a shale gas reservoir. The method includes the following steps: acquiring earthquake data of a target area and electromagnetic data of the target area; making the electromagnetic data of the target area undergo a time domain processing method and a frequency domain processing method; processing the earthquake data of the target area to obtain the burial depth and thickness of the shale gas reservoir and the distribution range of the shale gas reservoir in the target area; using the burial depth, thickness and distribution range of the shale gas reservoir as constraint conditions to carry out restraint inversion on a complex resistivity of the target area, obtained through a time domain processing method so that a distribution change regularity of the complex resistivity of the shale gas reservoir is obtained; according to a relation of the distribution change regularity of the complex resistivity of the shale gas reservoir and the frequency domain complex resistivity of the target area, obtained through the frequency domain processing method, carrying out inversion so as to obtain a distribution change regularity of the polarizability of the shale gas reservoir; and according to the distribution change regularity of the complex resistivity of the shale gas reservoir and the distribution change regularity of the polarizability of the shale gas reservoir, determining areas, which are high in total organic carbon content, in the shale gas reservoir.

Description

technical field [0001] The invention relates to the field of geophysical exploration data processing, in particular to a method and device for comprehensively evaluating the content of total organic carbon or the distribution of organic matter abundance in shale gas reservoirs. Background technique [0002] In the exploration and development of shale gas, direct detection methods of total organic carbon content or organic matter abundance distribution in shale formations have always been valued. Currently, seismic attribute techniques are commonly used to identify and evaluate the distribution of total organic carbon content or organic matter abundance in shale formations. Although seismic exploration technology has high vertical resolution and can cover a large area of ​​exploration, due to the difference between shale with high TOC / high TOC and shale with low TOC / LOO Wave impedance and other sensitive seismic properties did not differ significantly. Therefore, this metho...

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Application Information

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IPC IPC(8): G01V11/00
Inventor 余刚何展翔刘雪军周印明朱永山张春贺赵春玲贠智能何兰芳张宇生郭锐
Owner BC P INC CHINA NAT PETROLEUM CORP
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