LITHOLOGIC RESERVOIRS ›› 2016, Vol. 28 ›› Issue (3): 12-19.doi: 10.3969/j.issn.1673-8926.2016.03.003

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Main controlling factors of the enrichment of Chang7 tightoil of  Yanchang Formationin southern Ganquan area,Ordos Basin

Zhang Fengqi1， Zhang Fengbo2， Zhong Hongli3， Wang Le2， Jiao Tao4， Wu Pengbo2   

  1.  1. School of Earth Sciences and Engineering ， Xi ’ an Shiyou University ， Xi ’ an 710065 ， China ； 2. Yanchang Petroleum （ Group ） Company Limited ， Yan ’ an 716000 ， Shaanxi ， China ； 3. College of Geology & Environment ，Xi ’ an University of Science and Technology ， Xi ’ an 710054 ， China ； 4. No. 5 Oil Production Plant ，PetroChina Changqing Oilfield Company ， Xi ’ an 710200 ， China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

 Based on the analyses of the main controlling factors for tight oil formation and its relationship with hydrocarbon distribution, the data of well logging, mud logging, well test and production test, laboratory analysis and test were used to study the main controlling factors of the enrichment of Chang 7 tight oil of Yanchang Formation in the southern Ganquan area, Ordos Basin. The results show that source rocks, source-reservoir assemblage, sedimentary facies and physical properties are the main controlling factors of the enrichment of Chang 7 tight oil in Ordos Basin.The widely developed high-quality source rocks in Chang 7 3 subzone are an important foundation for tight oil formation in the middle and upper layer of Chang 7, and control the total depth and scope of tight oil in each layer. Good source-reservoir assemblages ensure that the oil generated from the source rocks in Chang 7 3 subzone can expel and migrateinto the Chang 7 2 reservoir along the contact surfaces of sourcereservoir between Chang 7 3 subzone and Chang 7 2 subzone. Favorable sedimentary facies zones control the distribution of tight oil in Chang 7. The relatively high porosity and high permeability sand bodies sealed by tight sandstone and mudstone control the accumulation of tight oil in Chang 7. This study may play a guiding role for the exploration of Chang 7 tight oil in Ordos Basin.

Key words: foamy oil viscosity, dispersed system, unconventional test, non-equilibrium phase behavior

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