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| Sedimentary sequences of salt-lake facies in Lower Es4 of Dongying Depression |
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MA Limin1, LI Zhipeng2, LIN Chengyan1,3, LIU Zhenyang4, LI Wentao2, YANG Xiancheng2, BU Lixia5
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.The Geology Scientific Institution of Shengli Oilfield, SINOPEC, Dongying 257061, China;3.The Key Laboratory of Reservoir Geology in the Shandong Province, Qingdao 266580, China;4.The West Research Centre of Shengli Oilfield, SINOPEC, Dongying 257061, China;5.Dongxin Oil Production Plant of Shengli Oilfield, SINOPEC, Dongying 257061, China)
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| Abstract: |
| Using rock cores, rock fragments and well logs, we studied the sedimentary characteristics, the sedimentary sequences and the correlation methods of lower Es4 in the eastern Dongying Depression, based on the theories of sedimentation and Markov chain method. The results reveal the existence of shoal and deep water evaporates in the Es4 salt-lake. The deep water evaporates, mainly gypsum and halite, are associated with glutenite of the near-shore subaqueous fan and charcoal grey deep-water shale, and are mostly in the center of the lake basin and the north steep slope. The shoal evaporates, mainly gypsum, halite and carbon rock, are associated with sand and purplish red mudstone of the over-lake delta, and are mostly in the south gentle slope. There are four correlation methods in the first gypsum-salt layer and two correlation methods in the second and third gypsum-salt layer. |
| Key words: sedimentary sequence gypsum-salt rock salt-lake facies lower 4th member Dongying Depression |
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