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Revisiting salt-forming models in the third member of Shahejie Formation in Dongpu Depression
PENG Jun1, FENG Zhendong2, GUO Dianbin1, CHENG Xiushen1, MU Wenjun2
(1.Research Institute of Exploration and Development, Zhongyuan Oilfiled, Puyang 457001, China;2.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)
Abstract:
Based on mineral X diffraction and the vertical distribution of chlorine isotopes, vertical sequences in Dongpu Depression and deposition and preservation processes of salt rock were analyzed combining the experiments of saline water evaporation and the salt lake drill data. The salt-forming models in Dongpu Depression from the deep-rooted mechanism were developed. Results suggest that,organic preservation may be facilitated with sufficient water depth during evaporation of salt-forming process in shallow water. Salt rock in shadow water may form with oil shale and pyrite. The volume of injected freshwater is the main factor to affect the vertical salt rhythmic deposition:it may cause the Cl isotope to vary when the injection is small, but with rising volume, chloride even sulfide may become deficient. The sandstone in Dongpu depression and the deficiency of coarse clastic in the hanging wall were caused by activities in bordered fault at small scales. Salt-forming in shadow water is most likely responsible for salt rock in the third member of Shahejie Formation.
Key words:  Dongpu Depression  the third member of Shahejie Formation  salt rock sequence  Cl isotope  origin of salt rock