Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1567-1579.doi: 10.13278/j.cnki.jjuese.201506101

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Petrophysical Parameter Cutoff and Controlling Factors of Medium- Deep Effective Reservoirs of Palaeogene in Southern Raoyang Sag

Cao Yingchang1, Zhang Huina1, Xi Kelai1, Zhao Xianzheng2, Zhou Lei1, Cui Zhouqi2, Jin Jiehua1   

  1. 1. School of Geoscience, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. North China Oilfield Company Limited, CNPC, Renqiu 062552, Hebei, China
  • Received:2015-01-03 Online:2015-11-26 Published:2015-11-26

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Abstract:

Based on measured properties, such as physical properties of log interpretation and oil production tests, the petrophysical parameter cutoff and depth of medium-deep effective reservoirs of Paleogene in the southern Raoyang sag are determined by distribution function curve method, test method, oil production test method, and the fitting formula of petrophysical parameters. Further, the porosity difference is introduced combining with the analysis on the characteristics of sediments, diagenesis, and reservoir pressure of the medium-deep reservoirs in southern Raoyang sag; and the controlling factors of effective reservoirs are discussed. The results show that the subaqueous distributary channel and estuary bar of fan delta front subfacies are suitable for the growth of effective reservoirs; while the properties of delta-front sheet sand and inter distributary bays are weak, where less effective reservoirs are developed. When the thickness of sand is greater than 3 meters, the sand could be developed into an effective reservoir. Compaction and cementation are the main factors to decrease porosity and permeability of reservoirs; while dissolution increases the secondary pores, and in turn, makes the physical property of reservoir better. The existence of overpressure promotes the development of effective reservoirs.

Key words: medium-deep reservoirs, effective reservoirs, petrophysical parameter cutoff, controlling factors, Raoyang sag

CLC Number: 

  • P618.13

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