Low-angle seam identification method and device

A recognition method and a technology of a recognition device, which are applied in the field of geological exploration, can solve problems such as low-angle fracture recognition and prediction problems, and achieve good recognition and good recognition effects

Pending Publication Date: 2022-04-12
PETROCHINA CO LTD
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The above-mentioned methods are mainly aimed at high-angle structural fractures, but there are relatively few studies on

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  • Low-angle seam identification method and device
  • Low-angle seam identification method and device
  • Low-angle seam identification method and device

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[0071] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0072] Taking well logging and seismic information methods as examples, it is difficult to effectively distinguish formations from low-angle fractures due to the limited resolution of seismic data. Well logging is currently the method that can meet the accuracy requirements of low-angle fracture prediction. Based on the conventional logging data, the fracture identification methods are mainly proposed, such as the resistivity invasion correction difference rat...

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Abstract

The invention provides a low-angle seam identification method and device. The method comprises the following steps: acquiring resistivity data, porosity data and imaging logging data of a target area; generating a resistivity crack identification result according to the resistivity data; generating a porosity crack identification result according to the porosity data; and performing low-angle crack identification according to the resistivity crack identification result, the porosity crack identification result and the imaging logging data. According to the method, the target of identifying the low-angle seam by comprehensively applying the resistivity intrusion correction difference ratio method and the three-porosity ratio method is achieved, the advantage that the resistivity intrusion correction difference ratio method can identify the inclination angle of the seam is brought into full play, and meanwhile the advantage that the three-porosity ratio method is good in identification effect on the low-angle seam and can predict the development strength of the seam is brought into play; therefore, the low-angle crack can be identified well. And guidance is provided for follow-up oilfield development scheme adjustment and water injection development.

Description

technical field [0001] The invention relates to geological exploration technology, in particular to a method and device for identifying low-angle seams. Background technique [0002] Fractures are widely developed in carbonate reservoirs, and 12 of the 35 large-scale carbonate reservoirs discovered in the world have developed natural fractures, accounting for 34%. Fractures have an important influence on the direction of oil-water seepage and the seepage velocity of underground fluid, so fracture prediction is one of the important topics in oilfield development research. [0003] In the prior art, the research on fractures mainly focuses on the prediction of high-angle structural fractures (the angle of structural fractures is greater than 30°). The predecessors’ identification and prediction of high-angle structural fractures can be summarized into five methods: (1) measuring Well and seismic information method to predict fractures; (2) numerical simulation method to predi...

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Application Information

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IPC IPC(8): G01V11/00
Inventor 李长海赵伦孙猛赵文琪范子菲李建新王淑琴陈松
Owner PETROCHINA CO LTD
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