Automatic stratum dip angle pickup method based on gamma imaging logging while drilling

An imaging logging and formation dip technology, which is used in measurement devices, nuclear radiation exploration, geophysical measurement, etc., can solve problems such as slow speed and low efficiency, and achieve the effect of improving accuracy and efficiency and overcoming the great influence of experience.

Pending Publication Date: 2020-06-19
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for automatically picking formation dips based on gamma-ray imaging logging while drilling. , low efficiency and these shortcomings, it can realize the automatic and fast picking of formation dip angle

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  • Automatic stratum dip angle pickup method based on gamma imaging logging while drilling
  • Automatic stratum dip angle pickup method based on gamma imaging logging while drilling
  • Automatic stratum dip angle pickup method based on gamma imaging logging while drilling

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specific Embodiment

[0046] see figure 1 , an embodiment of the present invention provides a method for automatically picking formation dips based on gamma-ray imaging logging data while drilling, comprising the following steps:

[0047] Step 1, using LWD to obtain gamma-ray imaging logging data while drilling. Drilling gamma imaging logging data is obtained in accordance with the procedures stipulated in the Petroleum and Natural Gas Industry Standard of the People's Republic of China "Technical Specifications for Logging While Drilling Operations SY / T 6692-2013". It is obtained by processing gamma logging values ​​measured in different azimuths.

[0048] In step 2, the gamma imaging logging data obtained in step 1 is defined as a sample (i.e. the gamma imaging logging data matrix M while drilling), and the gamma imaging logging data matrix M while drilling is:

[0049]

[0050] In the formula, m ij is the gamma measurement value of the i-th depth and the j-th azimuth.

[0051] The differe...

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Abstract

The invention discloses an automatic stratum dip angle pickup method based on gamma imaging logging while drilling gamma. The method comprises the steps of obtaining gamma imaging logging while drilling data through logging while drilling; processing the gamma imaging while drillingdata by using an ordered data optimal segmentation method, and automatically identifying depth points of a stratum interface; performing sine curve fitting on the automatically picked stratum interface depth points by using a least square method to obtain an accurate stratum interface sine curve; calculating a stratum relative inclination angle according to the fitted stratum interface sine curve; and calculating a stratum inclination angle by combining the well deviation curve and the stratum relative inclination angle. The defects that manual picking and man-machine interaction picking methods are greatly influenced by experience, low in speed, low in efficiency and the like are overcome, automatic and rapid picking of a stratum inclination angle is achieved, the stratum inclination angle picking precision and efficiency are improved, and the effect of gamma imaging logging while drilling in geosteering is improved.

Description

technical field [0001] The invention belongs to the field of petroleum logging, and in particular relates to a method for automatically picking up formation dip angles based on gamma imaging logging while drilling. Background technique [0002] As the focus of oil and gas exploration and development shifts to unconventional oil and gas reservoirs such as fracture-vuggy reservoirs, shale oil and gas, coalbed methane, tight oil and gas, and offshore oil and gas, the number of highly deviated wells and horizontal wells continues to increase. People pay more and more attention to it. Gamma imaging logging while drilling is one of the most commonly used methods in geosteering. Gamma-ray imaging logging while drilling is based on conventional natural gamma-ray logging. Multiple gamma-ray detectors in different directions of the tool are used for measurement, so that the gamma-ray measurement data has azimuthal characteristics. In addition to the identification of lithology and ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/04
CPCG01V5/04
Inventor 吴有彬成志刚罗少成林伟川张蕾崔玮郭笑锴周丽艳李婷婷杨超超
Owner BC P INC CHINA NAT PETROLEUM CORP
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