Experimental Research For Acoustic Parameters And Dynamic Elastic Modulus Of Samples And Full-wave Measurement Of Model Well

Elastic modulus is an important physical rock parameters, exploratory well, bridge fabrication, hydraulic engineering and so requires precise measurements of rock elastic modulus. In this paper, rock samples dynamic elastic modulus was measured by acoustic, the difference of the elastic modulus between drying of the rock samples and water saturated samples.Studying the acoustic velocity parameters of rocks in oil exploration, at the same time, there are many people in the study of acoustic attenuation. Velocity and attenuation are two different parameters of the acoustic response of the media characteristics. So, in order to fully describe the medium on the acoustic response, at least need two characteristic parameters, including acoustic wave propagation velocity and the quality factor values of attenuation. Theoretically, the velocity and attenuation considered together is not only attractive, but also has proven to be a good way to simulate or inversion.The changes in rock physical properties, the quality factor Q value is a very useful parameter. Attenuation of acoustic is the main method of energy absorption properties in the rock, I am in the results of previous studies, based on the compiled data processing program, using the energy method and the spectral ratio method in granite, acrylic, nylon and other specimens for the attenuation experimental study, obtained valuable data. Acoustic wave propagation in rocks on the attenuation mechanism was discussed that the mineral grain boundaries and micro-cracks viscous friction surface, and the macro-crack is caused by the scattering effect of acoustic attenuation the main mechanisms. Studying on the physical properties of rock strata, especially for the attenuation of the research has been an important research project. Quality factor Q value is an important parameter of the rock characteristics, there are many ways on the Q value research, and the results are very beneficial for the development of logging and exploration. In the laboratory, the most commonly used method is resonance method and ultrasonic method, resonance frequency range for 1 ~ 10 kHz, compared to the application of ultrasonic 100 kHz or more. The two methods and, like many other approaches are often based on the constant value Q model, in terms of constant value Q model is a not very wide frequency band. For the same sample, the same acoustic test system, the measured Q values can be very different, this is determined by experimental conditions and test methods, it is impossible to eliminate the external factors. So, in general, different methods of measurement can not comparable between the Q values. Mostly in the laboratory using spectral ratio method to calculate the quality factor Q, one of the various methods of calculating Q values were compared, comparison, and not to find a way to adapt to any situation. No matter which method is only used to adapt to certain conditions. For example, the amplitude of a corresponding record, the analytic signal method is more practical. When we can't get true amplitude, the spectrum simulation method is very useful theory. Amplitude attenuation and rise time depends on the sampling rate rules and data quality, when data quality as the better choice as more practical. In the absence of noise, the spectrum ratio method is a good way to be effective. In this paper, the spectral ratio method and energy method to the Q value of the two methods were studied.Full-wave measurement of the model well is a focus of the content of this article. Sound signals used on a continuous record of the well, inspired by the sound source received by the probe reflect the formation of acoustic information, to detect oil reservoirs in order to guide production. In the experiment in order to eliminate the reflected wave we have the model well border embossed, teeth of, bold and other treatment. A variety of wells were full-wave measurement by three kinds of Hydrophones. In order to better highlight the longitudinal wave component, we have done the same experiments which the beginning we do in water with honey and the castor oil, but the effect is not obvious well in suppressing Stoneley wave. Therefore, in order to suppress Stoneley wave better, we want to choose a liquid whose Q value greater than 10. In this study, the use of probe different parts of the past we have adopted a low-frequency probe is launched, high-frequency probe receiver situation. The effect is equivalent to the filter, which will be filtered out of the reflected waves. It will be very enlightenment for later experimental work.