Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (1): 106-110,117.doi: 10.11743/ogg20060117

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Heterogeneity of non-marine reservoirs and its influences on recovery factor; take Gaoshangpu and Yonganzhen oil reservoirs in Jidong and shengli oilfields as examples

Yin Zhijun1, Lu Guoyong2, Zou Xiang3, Yang Zhipeng4   

  1. 1. China University of Petroleum, Beijing 102249, China;
    2. Third Drilling Company of Dagang Oilfield, Tianjin 300280, China;
    3. Institute of Geology, Shengli Oil Production Plant, Shengli Oilfield, Dongying, Shandong 257000, China;
    4. Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063004, China
  • Received:2005-05-12 Online:2006-02-25 Published:2012-01-16

Abstract:

Reservoir heterogeneities mainly include interformational, intraformational and areal heterogeneities. The following understandings are achieved from study of the Gaoshangpu deep reservoir and other reservoirs in Jidong and Shengli oilfields. The interformational heterogeneity may result in monolayer breakthrough in the main sublayer, early watered out the main layer, low recovery percent in the non-major reservoirs and low oil displacement efficiency during waterflood development. The intraformational heterogeneity controls and affects the swept volume of the injectant in single sand layer, directly determines the waterflood efficiency, and is the key factor influencing the distribution of the remaining oil. The areal heterogeneity directly influences the swept area and sweep efficiency of the injected water, and thus controls the areal distribution of the remaining oil. Based on these understandings, several geological and developmental measures, including subdivision of layer series for development, separate zone water injection and detailed study of flow unit, are presented to effectively lower the influences of various heterogeneities on the ultimate recovery factor of oil reservoirs.

Key words: heterogeneity, recovery factor, non-marine reservoir, remaining oil, oil displacement efficiency

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