低渗透砂岩油藏注水诱导裂缝特征及其识别方法——以鄂尔多斯盆地安塞油田W区长6油藏为例

doi:10.11743/ogg20170620

Abstract

Abstract: This paper introduces the principles of waterflood induced fracture,clarifies their basic characteristics and proposes the methods to identify them.Then the waterflood induced fracture of Well A0 group of Chang 6 reservoir in W area in Ansai oilfield,Ordos Basin has been identified by these methods.With larger scale,long extension and high permeability,waterflood induced fracture are tension fractures which are not controlled by single stratum in vertical extension.Their trend direction are generally along the present maximum horizontal principal stress or the main seepage fracture direction.In a long term waterflooding process,the following are clear indications for the establishment of waterflood induced fracture between producer and injector wells:if the oil wells shows a gradually dominant direction of flooding,the water-cut curve presents step-type rise,well test interpretation has the character of fracture seepage,the water injection profile of the injection well gradually presents finger-like water absorption characteristics,inflection point appears in water injection index curve,tracer or water flooding front monitoring showed good connectivity between wells.

Key words: waterflood induced fracture, water flooding dynamic characteristics, extra low-permeability sandstone reservoir, Ordos Basin

CLC Number:

TE348

Zhao Xiangyuan, Zeng Lianbo, Hu Xiangyang, Zhu Shengju. Characteristics of waterflood induced fracture in low-permeability sandstone reservoirs and its identification methods:A case study from Chang 6 reservoir in W area in Ansai oilfied,Ordos Basin[J]. Oil & Gas Geology, 2017, 38(6): 1187-1197.

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Characteristics of waterflood induced fracture in low-permeability sandstone reservoirs and its identification methods:A case study from Chang 6 reservoir in W area in Ansai oilfied,Ordos Basin

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