石油与天然气地质 ›› 2010, Vol. 31 ›› Issue (2): 250-254+259.doi: 10.11743/ogg20100218

• 石油与天然气地质 • 上一篇    下一篇

苏北盆地桥河口油田阜二段第三砂层组裂缝参数模拟计算

刘肖军   

  • 出版日期:2010-04-26 发布日期:2010-09-02

Simulation of fracture param eters in the3 rd sand unit of the Paleogene Fuˉ2m ember in the Q iaohekou oilfield

Liu Xiaojun   

  1. Office of Science and Technology; SINOPEC Jiangsu Oilfield Company; Yangzhou; Jiangsu 225009; China
  • Online:2010-04-26 Published:2010-09-02

摘要:

低渗透油气藏中的储层裂缝不仅为油气储集提供了空间,而且是油气渗流的重要通道,目前对裂缝的研究多限于定性描述。准确计算裂缝的开度、密度、孔隙度和渗透率等参数是裂缝定量研究的主要内容,也为油气田开发奠定基础。基于岩石破裂准则,建立了苏北盆地桥河口油田阜二段第三砂层组造缝时期古地应力和现今地应力与裂缝参数之间的关系,通过构造解析确定了造缝时期古地应力的性质和方向,用声速法、水力压裂法和声发射法计算了现今地应力的方向和大小,将古今地应力场的数值模拟结果代入裂缝参数计算模型中,模拟计算了桥河口油田阜二段第三砂层组裂缝的开度、密度、孔隙度和渗透率。靠近主断层的构造高部位裂缝发育程度较高,不同方向裂缝渗透率的差异反映了裂缝自身的方向性,岩心统计和测井解释验证了模拟计算结果的可靠性。

关键词: 地应力, 裂缝孔隙度, 裂缝渗透率, 有限元分析, 桥河口油田, 苏北盆地

Abstract:

Fractures in lowˉpermeability reservoirs not only provide accumulation space and also act as seepage channels.However,present research on these fractures ismostly confined to qualitative descriptions.An accurate calculation of certain fracture parameters,such as openess,density,porosity and permeability,is of great imporˉtance in fracture quantitative descriptions and also a fundamental factor for the developmentofoil and gas fields.This paper documents a study that tries to construct a relationship between the ancient earth stress during the fracture form ing period and fracture parameters and that between the present earth stress and the parameters,determ ine the characters and directions of ancient earth stress through a structure analysis,and calculate the direction and strength of the present earth stress by using suchmeans as sonic velocity,hydrofrcturing,and sound em ission.The results are introduced into the fracture parameter calculatingmodel to simulate and calculate the openess,density,porosity and permeability of the fractures in the3 rd sand set of the Paleogene Fuˉ2member in the Qiaohekou oilfield.It is concluded that fractures are highly developed in the structural high near the main fault and the differences in fracture permeability reflect the differences of their directions.Core statistics and log interpretation verify the correctness of the stimulation results of the model.

Key words: Qiaohekou oilfield, earth stress, fracture porosity, fracture permeability, finite element analysis