关键词: 含盐层系, 沉积特征, 控制因素, 分布规律, 成盐模式, 金坛储气库

Abstract: For the safe and continuous operation，further development and construction of Jintan gas storage, based on the observations of core and thin sections, the analysis of well logging and seismic and testing data, the sedimentary facies characteristics, development characteristics, controlling factors and sedimentary pattern of salt-bearing sequence in the study area were studied. The results showed that the salt-bearing sequence rocks can be divided into five categories: salt rocks, sulphate rocks, carbonated rocks,  and silt rocks, six types of bedding structures, and two types of chemical genesis structures，and their sedimentation was in arid， hot and high salinized water. The salt-bearing sequence has the characteristics of box-shaped, bell-shaped, tooth-shaped, funnel-shaped and flat-shaped on logging curves, and there are three types of seismic reflection characteristics in the seismic profile of the salt-bearing sequences: parallel, irregular hummocky, and lobate isolation. The salt-bearing sequences in the study area are salt lake sediments, which can be divided into three sub-facies, including depocenter of gypsum-halite, transitional zone of carbonatite and edge zone of sand shale, and seven micro-facies are identified. The salt-bearing sequences have different sedimentary characteristics and distribution pattern in each sequence. The highstand system tract is characterized by the biggest salt thickness  in the middle stage of depositional progress. The paleogeomorphology controls the type and distribution of the sedimentary microfaces, the openness of water body controls the sedimentary sequence evolution and lithological combination, and the alternation of lake level controls the rock type and distribution law of the salt-bearing sequences. A salt-forming model of localization and superposition is established in the study area, and the low-lying area in the lake-basin center is favorable for further development and construction.

Key words: salt-bearing sequence, sedimentary characteristics, controlling factors；distribution rule；salt-forming model；Jintan gas reservoir