Method of acoustic logging and quantifying cavern filling degree

Abstract

The invention relates to a method of acoustic logging and quantifying a cavern filling degree and belongs to the field of petroleum and geology. The method comprises the following steps that 1 a stratum model is established: a real environment of an actual shaft acoustic wave instrument is imitated, wherein a stratum is made of limestone, the longitudinal wave time difference is 154 microseconds per meter and the density is 2.7g/cm<3>; 2 acoustic numeral is simulated: acoustic wave whole wave train data and an imitated acoustic wave whole wave train curve with the different filling degrees are obtained; 3 acoustic wave interval transit time is extracted and the transversal and longitudinal wave acoustic wave interval transit time with the different filling degrees are calculated; 4 response regularity of the interval transit time and the filling degree is analyzed; and 5 a quantification calculation model of the cavern filling degree is established and response characteristics of the acoustic wave interval transit time caused by the different filling degrees and the regulation of the response characteristic are analyzed. According to the numerical simulation to a sound field in a barefoot well, the filling degree calculation model is established to quantifying and assessing the different filling degrees in a cavern type reservoir stratum so that practicality is high and popularization and application value is good.

Description

technical field [0001] The invention relates to a method for quantitatively filling caves by using acoustic logging data, which uses acoustic logging data to carry out a quantitative calculation model of the filling degree of caverns, so as to improve the logging interpretation technology of cave-type reservoirs, and belongs to the field of petroleum and geology. Background technique [0002] In recent years, with the continuous deepening of marine carbonate oil and gas exploration, a number of large or extra-large fractured-vuggy carbonate reservoirs have been discovered in my country's Sichuan, Bohai Bay, and Tarim basins. The research on salt rock reservoir has become a new hotspot. [0003] Cave-type carbonate reservoirs are an important type of carbonate reservoirs. Practice has proved that this type of reservoir is an important guarantee for the stable and increased production of carbonate oil and gas reservoirs. In the evaluation of carbonate rock reservoirs, general...

AI Technical Summary

Problems solved by technology

As the theoretical research on the logging response mechanism of cavernous reservoirs is still in the exploratory stage, especially the quantification of the cave filling degree of cavernous reservoirs is still blank, resulting in the logging evaluation level of cavernous reservoirs being unable to meet the requirements of on-site production. needs, and thus adversely affect the evaluation and development of oil and gas reservoirs in the later stage

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