Marine riser gas intrusion monitoring device and method based on spectrum signature analytical method

The invention discloses a marine riser gas intrusion monitoring device and method based on a spectrum signature analytical method. The marine riser gas intrusion monitoring device comprises an underwater host, a marine riser, an underwater monitoring device, a ground host and a data analyzer. The marine riser gas intrusion monitoring method includes the steps of obtaining basic data, obtaining monitoring data, plotting a curve of spectral spectrum signature parameters changed along with time, and determining whether gas intrusion happens to the marine riser or not according to the difference between monitoring signal spectrum signature parameters and basic data spectrum signature parameters. The marine riser gas intrusion monitoring device and method based on the spectrum signature analytical method are simple and convenient to operate and are used for identifying whether gas intrusion happens to the marine riser or not and determining the degree of gas intrusion, the precision is sensitive, and the reliabili