Sedimentary microtopography in sequence stratigraphic framework of Upper Ordovician and its control over penecontemporaneous karstification, No. I slope break, Tazhong, Tarim block
来源期刊：中南大学学报(英文版)2014年第2期
论文作者：ZHANG Yun-feng(张云峰) WANG Zhen-yu(王振宇) QU Hai-zhou(屈海洲) LUO Chun-shu(罗春树) LI Yue(李越)
文章页码：735 - 744
Key words：sequence stratigraphy; sedimentary microtopography; penecontemporaneous karstification; Upper Ordovician; Tazhong I slope break; Tarim block
Abstract: In order to reveal the relationship between the penecontemporaneous karstification and sedimentary microtopography in sequence stratigraphy, the sequence stratigraphic framework of Lianglitage formation in Upper Ordovician is studied according to the well drilling, logging, geophysical data, detailed observations of core and the paleontology. The Lianglitage formation belongs to the sequence Ⅳ of Ordovician. The second member of Lianglitage formation is prograde sedimentation in highstand systems tract, and is favorable for developing reef flat. The development scale and thickness of reef flat are controlled by the variation of secondary sea level. The types and characteristics of karst in the highstand systems tract show that the late highstand systems tract is dissolved and cemented by the meteoric fresh water and mixed water. Penecontemporaneous karstification is developed at the top of parasequence and high place of geomorphology. Atmospheric diagenetic lens is formed. The developing regulations and controlling factors of penecontemporaneous karstification can provide new clues to the prediction and exploration of favorable reservoir in this area.
ZHANG Yun-feng(张云峰)1, 2, WANG Zhen-yu(王振宇)1, QU Hai-zhou(屈海洲)1, LUO Chun-shu(罗春树)3, LI Yue(李越)4
(1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,
Chengdu 610500, China;
3. Research Institute of Exploration and Developmernt, Tarim Oil and Gas Branch Company, Kurla 841000, China;
4. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China)
Abstract:In order to reveal the relationship between the penecontemporaneous karstification and sedimentary microtopography in sequence stratigraphy, the sequence stratigraphic framework of Lianglitage formation in Upper Ordovician is studied according to the well drilling, logging, geophysical data, detailed observations of core and the paleontology. The Lianglitage formation belongs to the sequence Ⅳ of Ordovician. The second member of Lianglitage formation is prograde sedimentation in highstand systems tract, and is favorable for developing reef flat. The development scale and thickness of reef flat are controlled by the variation of secondary sea level. The types and characteristics of karst in the highstand systems tract show that the late highstand systems tract is dissolved and cemented by the meteoric fresh water and mixed water. Penecontemporaneous karstification is developed at the top of parasequence and high place of geomorphology. Atmospheric diagenetic lens is formed. The developing regulations and controlling factors of penecontemporaneous karstification can provide new clues to the prediction and exploration of favorable reservoir in this area.
Key words:sequence stratigraphy; sedimentary microtopography; penecontemporaneous karstification; Upper Ordovician; Tazhong I slope break; Tarim block
