Abstract: The gas reservoir-type gas storage is the focus of the national energy strategy deployment, which undertakes the arduous task of natural gas peak shaving and supply guarantee. Trap tightness is the primary prerequisite to ensure the safe operation of gas storage. However, the evaluation methods for trap tightness of gas reservoir-type gas storage are quite different, and a systematic and complete evaluation model has not been established. On the basis of a large number of domestic and foreign gas storage tightness evaluation and monitoring research, based on the characteristics of Huangcaoxia gas storage traps, a “static-dynamic” combination of gas storage reservoir trap tightness evaluation model was established, focusing on both caprock sealing and fault sealing. Also, a “monitoring well and microseismic” monitoring method was formed, and the working parameters of the gas storage can be dynamically adjusted in a timely manner based on the monitoring data. Through the constructed evaluation and monitoring model, the trap tightness of Huangcaoxia gas storage is preliminarily evaluated and monitored, and it is considered that the trap tightness is good. The research results have certain reference value for improving the evaluation and monitoring system of gas reservoir-type gas storage tightness at home and abroad.

Key words: gas storage reservoir, trap sealing evaluation, static-dynamic combination, collaborative monitoring