Method and system for identifying horizontal well segmented acid fracturing liquid supply layer section

The invention provides a method and system for identifying a horizontal well subsection acid fracturing liquid supply interval, and the method comprises the following specific steps: obtaining the bottom hole pressure, the crack extension pressure and the original formation pressure during the acid fracturing construction of each subsection; when the bottom hole pressure of each section fluctuates between the original formation pressure and the fracture extension pressure, the multiple fracture-cavity bodies are communicated through the acid fracturing; calculating the difference value between the bottom hole pressure and the original formation pressure during the acid fracturing construction of each section to obtain the oil reservoir pressure difference value before and after the acid fracturing, and judging whether the layer section where the communicated fracture-cavity body is located is the main liquid supply layer section according to the oil reservoir pressure difference value before and after the aci