Abstract
Scientific site selection can significantly reduce construction risk and cost during construction of underground petroleum storage. Based on the analytic hierarchy process (AHP) theory and ideal point theory, a new site selection model for large underground petroleum storage is established in this paper. Nine indicators are selected as evaluation indices, including joint development, natural water-sealed condition, rock mass strength, in situ stress, environmental ecological vulnerability, regional stability, technical and economic conditions, topography, and meteorological conditions. Based on AHP theory, the weight of each evaluation index is determined. Secondly, the positive and negative ideal solutions of these evaluation indices are determined using ideal point theory. The ideal point evaluation function of each evaluation index is built to calculate the degree of closeness for the evaluation samples. Finally, the accuracy of the model is verified by using the model to evaluate the first underground petroleum storage project in China. The results show that the first six indicators are main controlling factors, and the sum of their weight is 88.3%. The result of the evaluation site level is good (II), which is suitable for construction. Moreover, the feasibility and accuracy of the evaluation criteria, and evaluation method is verified after cooperation with the power coefficient method and expert evaluation method. The research results can provide some references to the site selection of similar key projects.
Highlights
Underground water-sealed petroleum storage is an important method for storing national strategic reserves of oil
The analytic hierarchy process (AHP)-ideal point model is tested by applying the site selection evaluation to an underground petroleum storage in China
The steps of the site selection AHP-Ideal point model are as follows: (1) Based on the geological conditions, construction difficulties, and economic costs, we construct the judgment matrix by using the 1~9 scale method proposed by professor Saaty [20,21]
Summary
Underground water-sealed petroleum storage is an important method for storing national strategic reserves of oil (gas). The petroleum reservoir principle of water-sealed rock caverns states that petroleum may be safely stored in an underground cavern below the stable groundwater level [1]. After World War II, the Scandinavian Peninsula, South Korea, Japan, the United States, Germany, France, Saudi Arabia, and other countries and regions established groundwater-sealed petroleum reservoirs [2,3,4,5]. Only a few relatively small underground petroleum storage reservoirs were built, which do not meet the needs of the current national strategic oil reserves. It is imperative to construct a large number of underground water-sealed petroleum storages units in the future [6]
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