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Reconstitution of original lake basin during Triassic Yanchang stage and sand body genesis in the center of Ordos Basin

PANG Jungang1， LU Tao2， GUO Ji’an3， LI Wenhou4   

  1. 1. School of Earth Sciences and Engineering， Xi’an Shiyou University， Xi’an 710065， China； 2. Research Center of Sulige Gas Field， PetroChina Changqing Oilfield Company， Xi’an 710018， China； 3. No. 2 Comprehensive Geophysical Exploration Research Party， Bureau of Geology and Mineral Resources Exploration and Development of Shaanxi， Xi’an 710016， China； 4. Department of Geology， Northwest University， Xi’an 710069， China
  • Online:2012-08-20 Published:2012-08-20

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Abstract:

Based on large quantities of drilling, outcrop and core data, combined with field observation and laboratory study, the lake shoreline, deep lake line and the lake basin bed formwere restored. The result shows that the lake basin center of Chang 6 period is located at Zhengning, Ganquan and Miaowan area. Delta sand bodies are developed in northeast gentle slope break zone, braided delta and gravity flow （mainly turbidite and sandy debris flow） in deep lake are developed in southwest steep slope break zone, shallowwater slope break zone and deep water gentle slope break zone are mainly developed in the northeast, and deep water steep slope break zone is mainly developed in the southwest of the lake basin, with the center migrating to the southwest and then to northeast. Therefore, delta sand body is still the
target of exploration in the future. Meanwhile, the exploration of sand body formed in deep lake and during flooding should be enhanced. The sand body distribution rule in the east gentle slope break zone is different to that in the west steep slope break zone, sowe should adopt a different exploration strategy for different areas.

Key words: overpressure seal, mudstone, diagenesis, sealing ability, Dongying Depression

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