石油与天然气地质 ›› 2001, Vol. 22 ›› Issue (2): 158-160,193.doi: 10.11743/ogg20010216

• 油气空间 • 上一篇    下一篇

哈南阿尔善油藏微裂缝特征及其对开发的影响

张莉1, 杨亚娟1, 岳乐平1, 苗坤2, 宋社民2, 张满库2   

  1. 1. 西北大学地质系, 陕西西安710069;
    2. 华北油田二连公司, 内蒙锡林浩特026017
  • 收稿日期:2000-11-25 出版日期:2001-06-25 发布日期:2012-01-16

CHARACTERISTICS OF MICRO-FRACTURES AND THEIR INFLUENCE ON WATERFLOODING IN AERSHAN RESERVOIR, HANAN OILFIELD

Zhang Li1, Yang Yajuan1, Yue Leping1, Miao Kun2, Song Shemin2, Zhang Manku2   

  1. 1. Department of Geology, Northwest University, Xi'an, Shanxi;
    2. Erlian Company of Huabei Oilfields, Xilinhot, Nei Monggol
  • Received:2000-11-25 Online:2001-06-25 Published:2012-01-16

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摘要：

哈南油田阿尔善储层发育构造微裂缝.经显微镜薄片观察,微裂缝的开度区间为10～30μm,延伸长度为 l～3 mm,面积密度为每平方毫米0025 mm.微裂缝是大裂缝的前奏,大裂缝发育区也是微裂缝发育区,微裂缝发育受控于断裂构造,与断裂及大裂缝同向,以NE向为主.经模型观察,双重孔隙介质模型的水驱油方式为裂缝-部分基质孔隙驱油.微裂缝对开发具有双重作用,一方面微裂缝可以改善基质渗流能力,另一方面微裂缝与大裂缝、断层形成断裂网络,对汪水产生不利影响.针对这一特点,在微裂缝发育区域,应采用周期性注水以期提高驱油效果.

关键词: 哈南油田, 阿尔善油藏, 储层微裂缝, 注水开发

Abstract:

Structural fractures developed well in Aershan reservoir, Hanan Oilfield. The width of the micro-fractures is 10～30 pin, the length is 1～3 mm and surface density is 0.025 mm2. The micro-fracture porosity and permeability have been calculated, and the distribution is analyzed. Micro-fractures are preface of macrn-fractures and the macro-fracture developed areas are also micro-fracture developed areas. A sandstone micro-model experiment has been done to investigate the process of displacement between fractures and matrix. Based on the above studies, micro-fractures play two different roles on waterflooding. On one hand, they may improve the permeability of the reservoirs; on the other hand, the together with macro-fractures and faults may improve network, which have bad effect on waterflooding. According to the characteristics of,micro-fractures in Aershan reservoir, some suggestions such as periodic injection are put forward to improve the effect of waterflodding in fracture-developed areas.

Key words: Hanan Oilfield, Aesshan reservoir, reservoir micro-fractures, waterflooding

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