The Distribution of Rock Salt and Gypsum in Sequence Stratigraphic Framework—A Case in Jialingjiang Formation in Chongqing

2017 International Conference on Environmental and Energy Engineering

生态环境科学;能源学

Caixa, Gao^1,2 ; Jun, Yi^1 ; Junjiang, Su^1 ; Yongqin, Zhang^1 ; Bo, Li^1

Chongqing Vocationan Institiute of Engineering, Chongqing

402260, China^1

State Key Laboratory of Coal Resources and Safety Mining, Department of Resources and Earth Sciences, China University of Mining and Technology, Beijing

100083, China^2

关键词: Geothermal reservoir;    Highstand systems;    Jialingjiang formation;    Lithology and lithofacies;    Sealevel change;    Sequence boundary;    Sequence stratigraphic framework;    Third-order sequences;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/63/1/012040/pdf
DOI  :  10.1088/1755-1315/63/1/012040

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

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.