摘要
依据岩心、薄片、成像测井等资料对鄂尔多斯盆地致密储集层天然裂缝分布特征进行研究。鄂尔多斯盆地致密储集层天然裂缝发育,裂缝类型以高角度构造剪切缝为主,多呈连续台阶式分布,受岩石力学非均质性和现今应力场的影响,北东向裂缝为优势渗流方向。天然裂缝主要具有＂高角度、小切深、小开度、延伸短＂特征;发育程度主要受岩性和单砂层厚度控制,一般粉砂岩中天然裂缝最发育,泥岩中相对不发育,单砂层厚度越小,天然裂缝越发育。在天然裂缝分布特征及特征参数定量化评价的基础上,借助油藏基质和天然裂缝地质建模技术,建立了考虑天然裂缝的油藏综合地质模型,应用油藏数值模拟反演技术,确定了符合生产特征的有效天然裂缝平面分布规律,定量评价了天然裂缝对单井产量的贡献率（30.0%～50.0%）。
Based on core,imaging logging,and thin section data,the distribution features of natural fractures in the tight oil reservoirs of the Ordos Basin are examined.The tight reservoirs in the Ordos Basin are rich in natural fractures,the fractures are mainly high-angle structural shear fractures in continuous step arrangement.Affected by rock mechanical anisotropy and present stress field,the NE trending fractures are the dominating seepage flow direction.These fractures feature high angle,small cutting depth,small aperture and short extension,controlled by rock lithology and single layer thickness in development degree,natural fractures are most developed in fine siltstone,most undeveloped in mudstone.The thinner the single layer,the more developed the natural fractures will be.Based on distribution features of natural fractures and quantitative evaluation of natural fracture characteristic parameters,by using reservoir matrix and natural fracture geologic modeling,a comprehensive reservoir geologic model considering natural fractures was built,by using reservoir numerical simulation modeling inversion,the plane distribution of effective natural fractures was found out,and the contribution of natural fractures to single well production was quantitatively evaluated at around 30.0%？50.0%.The research results are of great significance for well-pattern deployment and optimization of development technical policies of similar reservoirs.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期740-748,共9页
Petroleum Exploration and Development
基金
国家科技重大专项"大型油气田及煤层气开发:超低渗透油藏有效开采技术"(2011ZX05013-004)
关键词
致密砂岩油
天然裂缝
分布特征
有效天然裂缝
鄂尔多斯盆地
tight sandstone reservoir
natural fracture
distribution characteristic
effective natural fracture
Ordos Basin
