Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (4): 655-660.doi: 10.11743/ogg20120423

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Development scheme and EOR technique of fracture-vug reservoirs in Tahe oilfield

Zhan Junyang1, Ma Xujie2, He Changjiang2   

  1. 1. Southwest Petroleum University of Technology, Chengdu, Sichuan 610059, China;
    2. The First Oil Plant of Tahe Oilfield, Northwest Oilfield Branch, SINOPEC, Luntai, Xinjiang 841600, China
  • Received:2012-08-14 Online:2012-08-28 Published:2012-09-11

Abstract:

The fracture-vug carbonate reservoir of A area in Tahe oilfield is a complex oil reservoir consisting of various spatially superimposed and connected fracture-vug units with multiple pressure systems and complex water-oil contacts.These fracture-vug units differ greatly in driving mechanism and production characteristics.The type-Ⅰ unit is dominated by water drive,the type-Ⅱ unit features in alternating water drive and elastic drive,while the type-Ⅲ unit is predominantly of elastic drive is for.According to the geological features of the reservoirs,this paper proposes a development scheme,i.e.taking the fracture-vug unit as the basic development blocks and implementing differential development,and presents an EOR method that is single well water injection to drive oil and multi-wells unite water injection for development.An additional recovery efficiency of 3.7% is obtained after field application of this method.

Key words: fracture-vug reservoir, carbonate rock, development scheme, Tahe oilfield, Tarim Basin

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