Abstract
AbstractThe carbonate reservoir of Dengying Formation in Sichuan Basin is an important natural gas reservoir. The study of acoustic characteristics of carbonate under different conditions can provide theoretical basis and data support for seismic exploration of the reservoir. This paper describes the complex pore structure of carbonate rock by means of rock casting thin section identification, nuclear magnetic resonance and CT scanning experiments, analyzes different types of carbonate reservoir. According to different types of reservoir, we will carry out P-wave and S-wave experiments on cores to study the P-wave and S-wave velocity of rocks under different conditions. Then we analyse the acoustic characteristics of different cores according to the difference of wave velocity and waveform. It is found that there are mainly two types of carbonate reservoirs in Sichuan Basin: fracture cave type and pore type. Most pore diameters of pore type rocks are less than 10 μm. At the same time, whether it is fracture cave type or pore type core, pores with a diameter above 0.1 mm provide nearly 90% of the pore volume. We find that there are differences in acoustic properties between fractured cave rock and porous rock. The P-wave velocity of fractured cave rock is lower than that of porous rock, and the P-wave waveform of fractured cave rock is more complex. When the rock is saturated, the P-wave velocity of the core increases, and the increase range of the fractured cave rock is more important. In the mean time, the saturation of the fluid also makes the waveform more regular. In this study, the pore structure of Dengying Formation carbonate rocks in Sichuan area will be characterized, and the P-wave and S-wave experiments are carried out on cores with different pore structures. The acoustic properties of rocks under different conditions will be analyzed from two aspects: wave velocity and waveform, this will provide theoretical basis and data support for seismic exploration of carbonate reservoirs.KeywordsCarbonatePore structureP-wave and S-wave experimentsAcoustic characteristic
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