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1. A device for testing the three-phase saturation of oil, gas and water in a high-temperature and high-pressure planar model includes a displacement pump, a confining pressure pump, a back pressure pump, a formation water intermediate container, a crude intermediate container, a dry gas intermediate container, a high-temperature and high-pressure planar model system, an acoustoelectric test positioning control and data acquisition system, a back pressure valve, an oil-gas separator, a gas meter and an oil-gas chromatograph, wherein said high-temperature and high-pressure planar model system includes a planar model, a high-temperature and high-pressure autoclave body, an autoclave body frame, a heating temperature-controlling system, a Y-axis direction stepping motor, a X-axis direction stepping motor, a Y-axis direction sliding rail, a X-axis direction sliding rail, a Y-axis direction sliding bock, a X-axis direction sliding block, an acoustoelectric detector and an autoclave body cover plate; said high-temperature and high-pressure autoclave body is placed on the autoclave body frame, having two autoclave body cover plates on both its sides, an autoclave body inlet, a confining-pressure-fluid-injecting inlet, and an autoclave body outlet are provided on the autoclave body cover plate, said planar model is embedded in the high-temperature and high-pressure autoclave body and fixed on the inside of the autoclave body cover plate, and has an injection inlet on its left side and a collecting outlet on its right side, the autoclave body inlet is connected to the injection inlet on the planar model and the autoclave body outlet 46 is connected to the collecting outlet on the planar mode by a pipeline, the confining-pressure-fluid-injecting inlet 45 is connected to the annular space between the high-temperature and high-pressure autoclave body and the planar model, said planar model is equipped with the heating temperature-controlling system, said planar model includes a model cover plate, a sand-filling model, and a planar pressure-bearing cavity, both sides of the planar model are equipped with the Y-axis direction stepping motor, the X-axis direction stepping motor, the Y-axis direction sliding rail, the X-axis direction sliding rail, the Y-axis direction sliding bock and the X-axis direction sliding block, said Y-axis direction stepping motor is fixed at one end of the X-axis direction sliding block and is integrated with the Y-axis direction sliding rail, and integrally installed on the X-axis direction sliding rail, said acoustoelectric detector is fixed on the Y-axis direction sliding block, driven by the Y-axis direction stepping motor to linearly slide along the Y-axis direction sliding rail, the X-axis direction stepping motor drives the X-axis direction sliding block to linearly slide along the X-axis direction sliding rail; said displacement pump is respectively connected to the high-temperature and high-pressure autoclave body inlet through the formation water intermediate container, the crude intermediate container, and the dry gas intermediate container, the confining pressure pump is connected to the confining-pressure-fluid-injecting inlet, and the autoclave body outlet is sequentially connected to the oil-gas separator, the gas meter, and the oil-gas chromatograph through the back pressure valve, and the top of the back pressure valve is connected to the back pressure pump, pressure sensors are arranged at said autoclave body inlet, said confining-pressure-fluid-injecting inlet, said autoclave body outlet and said the back pressure valve, respectively, said heating temperature-controlling system, said pressure sensor, said acoustoelectric detector, said Y-axis direction stepping motor and said X-axis direction stepping motor are all connected to the acoustoelectric test positioning control and data acquisition system to realize collecting temperature, pressure, ultrasonic waves, and resistivity data and controlling the movement of the stepping motor.
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