Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (1): 1-5.doi: 10.3969/j.issn.1673-8926.2009.01.001

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Controlling factors of above-generation and below-storage reservoir accumulation and favorable area prediction: A case study from K1 q2 in Shangjia region of Songliao Basin

FU Guang，LI Xiaowei   

  1. Daqing Petroleum Institute， Daqing 163318， China
  • Online:2009-03-16 Published:2009-03-16

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Abstract:

Shangjia region is outside of Sanzhao source area, and K1q2 reservoir is below K1qn1 source rocks. The migration mechanism of oil from  K1qn1 to Shangjia region is analyzed. Oil in Sanzhao source area firstly migrated downward into Fuyang reservoir through T2 faults under the action of overpressure, and then migrated to Shangjia region through sand bodies connected by faults under the action of buoyancy, finally directlymigrated and accumulated in high fault block traps of  K1qn2 which were in contact with Fuyang reservoir. The oil accumulation and distribution of K1q2 in Shangjia region are mainly controlled by three factors: high fault block traps developed in K1q2， high fault block traps located in the pathway of oil migration and sand bodies developed in high fault block traps. Based on the analysis of main controlling factors, it is considered that typeⅠfavorable areas of oil accumulation of K1q2 in Shangjia area mainly distribute in the areas controlled by Shang 9-6, Shang 118-120 and Shang 124-112 wells and around Sheng 26-14 well， and type Ⅱfavorable areas mainly distribute in the northern region along Shang 9-6 and Shang 118-120 wells.

Key words: stereoscopic exploration, natural gas, progress, practice experience, Sichuan Basin

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