Low-angle seam identification method and device

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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Problems solved by technology

The above-mentioned methods are mainly aimed at high-angle structural fractures, but there are relatively few studies on low-angle fractures. At present, the identification and prediction of low-angle fractures is still a difficult problem.

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