Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (4): 73-77.doi: 10.3969/j.issn.1673-8926.2009.04.014

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Sedimentary evolution model and petroleum significance of Chang-7 member turbidite，Ordos Basin

PANG Jungang1，LI Wenhou2，SHI Shuo3，XIAO Li4   

  1. 1. School of Petroleum Resources， Xi’an Petroleum University， Xi’an 710065， China； 2. Geological Department， State Key Laboratory of Continental Dynamics， Northwest University， Xi’an 710069， China； 3. Changqing Oilfield Branch Company， PetroChina，Xi’an 7100021， China； 4. Geological Research Institute of Shengli Oilfield Co.Ltd.， Sinopec， Dongying 257015， China
  • Online:2009-12-16 Published:2009-12-16

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Abstract:

The extensive extent turbidite can be identified by such apparent signatures as lithology, sedimentary structure, sedimentary sequence and well logs ofChang-7 member deep lake, Ordos Basin. During the paleo-geographic evolution of Chang-7 member, lake basin and deep lake are both at their maximum extent during Chang-73 stage, and turbidite was distributed fragmental-like in plane view, due to interplay of extensive extent deep lake and limited clastic supplying. Deep lake line was graduallymoved toward lake center and turbidite sand bodies were gradually developed better from stages of Chang-73, Chang-72 and Chang-71. And depositional evolution model in study area is established. There is better petroleum accumulation in deep lake, and turbidite sandstone can be better reservoir in deep lake. At present, some commercial oil wells were found in Southwest Ordos Basin and the turbidite sandstones can be the main exploration targets in the near future.

Key words: unconformity surface, hydrocarbon migration, hydrocarbon accumulation, Chengbei fault step belt, Dagang Oilfield

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