Risk assessment of salt cavern oil/gas storage based on accident statistical analysis

Based on the statistics of salt cavern oil/gas storage accidents abroad,a study of salt cavern oil/gas storage risk assessment is conducted using risk matrix analysis in order to provide statistical proof for the risk management during construction and operation.This thesis analyzes the salt cavern oil/gas storage's probability of tremendous accident,risk grade,accident types and the main accident causes.Research shows that the accident probability of a single salt cavern during construction and operation is 1.51%,and the general risk grade is between acceptable and unacceptable,so the related departments should pay more attention on its risk prevention mechanism;three main types of the tremendous accidents are oil and gas leakage,cavern failure and earth surface subsidence respectively;different from other two types whose risk grades are permissible,the risk grade of oil and gas leakage is acceptable,which calls for special attention;the most important causes of these accidents are casing failure,excessive creep and human error,and also overground setting failure and caprock breakage.