Carbonate fractured-vuggy reservoir body quantitative description method

Abstract

The invention discloses a carbonate fractured-vuggy reservoir body quantitative description method. The method comprises the steps of: obtaining a corresponding proportional relation of forward modeling and actual seismic data through performing amplitude uniform quantification processing on a wave equation forward modeling result and the actual seismic data; utilizing a correction coefficient formula or a paint obtained by the forward modeling result to calculate a frequency correction coefficient, a fractured-vuggy reservoir body width correction coefficient and a height correction coefficient of the actual seismic data; based on the proportion correction coefficient and the frequency correction coefficient, obtaining the volume of the fractured-vuggy reservoir body with a product of a squared value of the width correction coefficient and the height correction coefficient after the frequency correction serving as a volume correction coefficient; and combining the average porosity value of rock physical statistic analysis in a work area to perform quantitative description on the corrected reservoir body volume. According to the invention, the quantitative description of the carbonate fractured-vuggy reservoir body scale in the exploration area with the known porosity and the included fluid property is realized.

Description

technical field [0001] The invention relates to the field of petroleum geological development, in particular to a method for quantitatively describing carbonate rock fracture-cavity reservoirs mainly aimed at fracture-cavity reservoirs with abnormal reflections of "beaded" strong earthquakes. Background technique [0002] Carbonate rock is a general term for rocks composed of carbonate minerals formed by sedimentation, mainly limestone and dolomite. At present, although carbonate rocks only account for about 20% of the global sedimentary rock system, they hold 50% of the world's proven oil and gas resources and supply 60% of oil and gas production. In recent years, China has made great progress in the exploration of carbonate rock oil and gas. For example, many large carbonate rock fracture-cavity oil and gas reservoirs have been discovered and successfully exploited in areas such as the Tarim Basin. However, compared with other countries, the oil and gas There is still a l...

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Problems solved by technology

[0003] In the quantitative description of fractured-vuggy carbonate reservoirs in the early stage, the forward modeling threshold analysis method was mainly used to obtain the volume correction coefficient of fractures and caves by artificially limiting the threshold range. The volume correction coefficient is between 5% and 20%, which is relatively broad. With

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