Abstract
The Jialingjiang Formation of the Lower Triassic in the eastern Sichuan Basin is subdivided into four members. The first and third members are featured with limestone, while the second and forth members which are clipped with gypsum and halite are characterized by dolomite and limy dolomite. At the same time, the second and forth members are the main geothermal reservoir in Chongqing area. Two sequence boundaries represented by regional unconformities and the lithology-lithofacies transition surface are recognized in the Jialingjiang formation based on outcrop and borehole data analysis. A total of two third-order sequences are subdivided in the Jialingjiang formation, and they are subcorrelated to the intervals of Member 1 to Member 2, Member 3 to Member 4, respectively. Each sequence is further subdivided into lacustrine transgresive system tract (TST) and highstand system tract (HST) according to variation in lithology and lithofacies. The sea level change is the main factor to control the sequence development. With the sea level change, the middle and late periods of HST in sequence are the favorable periods of the development of rock salt and gypsum.
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