地学前缘 ›› 2009, Vol. 16 ›› Issue (4): 166-172.

• 论文 • 上一篇    下一篇

松辽盆地朝阳沟油田储层裂缝发育特征及控制因素

  

  1. 1中国石油大学(北京) 资源与信息学院, 北京 102249
    2中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249

  • 出版日期:2009-08-01 发布日期:2009-08-01
  • 作者简介:张震(1980—),男,博士研究生,主要从事储层裂缝和沉积学方面研究。Email: cupzhangzhen@yahoo.com.cn
  • 基金资助:

    国家自然科学基金项目(40772086)

Development characteristics and controlling factors of reservoir fractures in Chaoyanggou Oilfield, Songliao Basin.

  1. 1Faculty of Natural Resource & Information Technology, China University of Petroleum(Beijing), Beijing 102249, China
    2State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China

  • Online:2009-08-01 Published:2009-08-01

摘要:

裂缝是朝阳沟油田储层的有效储集空间和主要渗流通道,其复杂分布严重影响该油田的开发生产。通过区域构造研究与岩心构造解析,结合地表露头和薄片观察,分析了区内裂缝的发育特征、成因机制及控制因素。该储层主要发育近SN向、近EW向、NW向和NE向4组构造裂缝,裂缝以低角度裂缝为主,主要包括挤压褶皱作用下形成的顺层滑脱裂缝和与逆冲挤压作用有关的低角度剪切裂缝,高角度裂缝主要包括扩张裂缝和中高角度斜缝。裂缝的充填及含油性表明它们大部分为有效缝,并反映在地层条件下的储渗作用。明水组沉积末期的反转构造期是裂缝的主要形成时期,主要形成近SN向和近EW向构造裂缝。裂缝的发育程度受岩性、层厚、断层、褶皱、深度等因素的控制,不同岩性,裂缝发育程度也不同;裂缝的平均间距与裂隙化的岩层厚度呈较好的线性相关关系;绝大多数构造裂缝与断层作用相关;褶皱的不同形成阶段发育不同类型的裂缝;随深度增加,裂缝发育程度明显降低。

关键词: 储层裂缝;发育特征;控制因素;朝阳沟油田;松辽盆地

Abstract:

Fractures are the main flowing channel and effective storage space for the low permeability reservoir in Chaoyanggou Oilfield, Songliao Basin. The exploitation of oil deposits in this oilfield is strongly controlled by the complex distribution of fractures. Based on regional tectonic study, core structural analysis and the data from outcrops and thin sections, we have studied the developmental characteristics, the genetic mechanism and the controlling factors of the fractures in the Chaoyanggou Oilfield. The results show that there are four sets of tectonic fractures in the reservoir,  extending in the southnorth, eastwest, northwest and northeast orientations respectively.  The fractures with low dipangle are dominant in the studied area, which are mainly the alongbedding detachment fractures formed by compressive folding, and the shear fractures related to the thrusting of faults. The fractures with high dipangle are mainly the extension fractures and oblique fractures. The tectonic fractures are mainly formed in the reversal tectonic stage at the end of Mingshui Formation, when there developed the nearly SN and nearly EW orientations fractures. The development degree of the fractures is controlled by the factors of lithology, strata thickness, the faulting, the folding, the depth, etc. The development degree of fractures is different with different lithology; there is a linear relationship between the fracture spacing and the fractured strata thickness; most fractures have a relation to the faulting; the types of fractures are different with different formation phases of the fold; and the development degree of fractures is sharply decreased with the increase in depth.

Key words:

Key words: reservoir fracture; development characteristic; controlling factor; Chaoyanggou Oilfield; Songliao Basin

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