泾河地区中生界致密油藏天然裂缝发育主控因素及模式

发布时间：2018-02-21 00:27

本文关键词： 泾河地区延长组致密油藏天然裂缝主控因素　出处：《成都理工大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：研究鄂尔多斯盆地南部泾河油田长8油藏天然裂缝的发育主控因素及模式。通过野外露头、岩心、常规测井和成像测井资料,开展井剖面天然裂缝的识别。在数据的处理上,利用单一变量法分别对比工区内断层和裂缝的力学性质、统计裂缝发育指数与相邻断层距离的关系、不同岩性中裂缝的发育情况、裂缝发育指数与砂地比的关系、长8地层的构造曲率与裂缝发育指数的关系,结果表明:断层伴生2组共轭剪切裂缝,只有一组较发育,这些裂缝离断层越近,裂缝发育指数越高;随着泥质含量的增加,岩性逐渐向泥岩转化,天然裂缝的发育程度逐渐降低,平面上看,天然裂缝多发育在砂地比值较高的地方;构造曲率越大,天然裂缝发育的程度越高。泾河地区长8段裂缝发育的主控因素为岩性、构造变形和断层。其中断层对裂缝发育的影响表现在裂缝发育指数随断层距离的增加而减小,并且为控制裂缝发育的最主要因素;岩性中的脆性成分越高,裂缝越发育;构造变形程度越高,构造张裂缝也越发育。
[Abstract]:The development of natural fractures in Chang 8 reservoir of Jinghe Oilfield in southern Ordos Basin is studied. Through field outcrop, core, conventional logging and imaging logging data, the identification of natural fractures in well profile is carried out. The single variable method is used to compare the mechanical properties of faults and fractures in the working area, the relationship between the fracture development index and the distance between adjacent faults, the development of fractures in different lithology and the relationship between fracture development index and sand / soil ratio. The relationship between structural curvature and fracture development index of Chang8 formation shows that only one group of conjugate shear fractures associated with faults is more developed, the closer these fractures are to the fault, the higher the fracture development index is, and the higher the shale content is, the higher the fracture development index is. The lithology gradually transforms to mudstone, and the development degree of natural fracture decreases gradually. On the plane, natural fractures are mostly developed in places where the ratio of sand to soil is higher, the bigger the structural curvature is, the greater the tectonic curvature is. The higher the degree of natural fracture development is, the main controlling factors are lithology, structural deformation and fault. The effect of fault on fracture development is that the fracture development index decreases with the increase of fault distance. And in order to control the development of fracture, the higher the brittle component in lithology, the more developed the fracture, the higher the degree of structural deformation, the more developed the tectonic fracture.
【作者单位】：油气藏地质及开发工程国家重点实验室(成都理工大学);川庆钻探工程公司地质勘探开发研究院;大庆市第一中学;
【基金】：国家自然科学基金项目(41202096)
【分类号】：P618.13;TE31

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