Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 20-29.doi: 10.12108/yxyqc.20190103

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Influence of sedimentary events on deep water sedimentation process: a case of Chang 6 reservoir in Huaqing area,Ordos Basin

FU Qiang1, LI Jing1, DENG Xiuqin2, ZHAO Shijie1, PANG Jinlian2, MENG Pengfei1   

  1. 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2018-06-05 Revised:2018-08-23 Online:2019-01-18 Published:2019-01-18

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Abstract: The thick sandstone of Chang 6 reservoir in Huaqing area,Ordos Basin,is considered as the result of deep-water deposition. The data of core photographs,wire-logging,mud-logging and rock samples analysis were used to analyze sedimentary process in deep-water area and petrogenesis mechanism,including four main sedimentary events(gravity flow event,volcanic event,seismic event,and hypoxic event)happened in deep-water deposition process in Chang 6 reservoir. The results show that:(1)Gravity flow deposition events occurred frequently during the whole deposition process,which is the direct cause of large-area multi-layer accumulation of sand bodies in the deep-water area.(2)The intensity and influence range of volcanic activity in Chang 6 deposition period is much smaller than that in Chang 7,only with 1.74 m of average thickness of tuffaceous mudstones which are mainly distributed in Chang 62 and Chang 63 sandstone. Based on locations and sizes of tuffaceous mudstone developed,volcanic ash was considered add into the basin by river carrying.(3)The sedimentary tectonic features of core reflect the frequent occurrence of seismic events,and the magnitude of the earthquake is estimated to be about 4.5-5.5.(4)The combination of the above sedimentary events led to the occurrence of hypoxic events during the depositional period,and as a result,the source rocks rich in organic matter were deposited in the deep-water area,which formed a good source-reservoir-cap assemblage with reservoir sand bodies vertically.

Key words: deep-water deposition, gravity flow events, volcanic event, seismic event, hypoxic event, Yanchang Formation, Huaqing area, Ordos Basin

CLC Number: 

  • T122
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