西南石油大学学报(自然科学版)

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苏北盆地古近系页岩油储层有效裂缝识别

王海方*   

  1. 中国石化胜利油田勘探开发研究院,山东东营257015
  • 出版日期:2016-06-01 发布日期:2016-06-01
  • 通讯作者: 王海方,E-mail:wwhhff1214@sina.com

Recognition of Effective Fractures Within the Oil Shale in the Fourth#br# Member of Funing Formation in Northern Jiangsu Basin

WANG Haifang*   

  1. Research Institute of Exploration and Development Shengli Oilfield,Dongying,Shandong 257015,China
  • Online:2016-06-01 Published:2016-06-01

摘要:

为了查明苏北盆地古近系阜宁组四段(E1 f 4)裂缝型页岩油资源的富集规律,对钻孔岩芯所含裂缝进行了精细
地观察与描述,对区内E1 f 4 页岩基质和裂缝充填方解石进行了碳氧同位素测试、结合区域埋藏史、生烃史,总结了区
内油页岩储层裂缝成因类型与特征,划分了裂缝形成期次并识别了有效裂缝。结果表明:研究区E1 f 4 页岩裂缝可分
为4 种成因类型:平移式剪裂缝、正向剪切缝、逆向剪切缝和顺层缝;构造裂缝可分为5 期次,其中,第I 期为平移式
剪切缝,未见原油显示,形成于吴堡运动;第II 期为正向剪切缝,未见原油显示,形成于真武运动早期;第III 期为顺层
缝,原油显示丰富,形成于三垛运动中期;第IV 期为正向剪切缝,原油显示丰富,形成于三垛运动晚期;第V 期为逆向
剪切缝,属压性缝,形成于三垛运动末期。第III 期和第IV 期裂缝原油显示丰富,气测异常明显,为有效裂缝。

关键词: 构造裂缝, 碳氧同位素, 阜宁组四段, 页岩油, 苏北盆地

Abstract:

To investigate the distribution of shale oil in the fourth Member of Paleogene Funing Formation(E1 f 4)in Northern
Jiangsu Basin,the fractures contained in borehole cores were surveyed and describedin detail;the carbon and oxygen isotopes
within shale matrix and filling calcite were determined,and with consideration of the burial history and hydrocarbon generation
history,the genetic types of fractures and their features are summarized,the formation stages are divided and effective fractures
are discerned. We conclude that the fractures in E1 f 4 can be classified into four categories:strike-slip shear fracture,normal
shear fracture,reverse shear fracture and bedding fracture;the development of fractures can be divided into five stages:on the
first stage strike-slip shear fractures were formed in Wubao movement;on the second stage normal shear fractures were formed
in early Zhenwu movement;on the third stage bedding fractures were formed in mid Sanduo movement;on the fourth stage
normal shear fractures were formed in the late Sanduo movement and on the fifth stage reverse compressional shear fractures
were formed in the end of Sanduo movement. Among these five stages,no oil occurs in the first,second and fifth stages
of fractures while abundant oil appears in the third and fourth stages of fractures with obvious gas logging abnormality and
therefore the third and fourth stages of fractures are effective ones for oil exploration.

Key words: tectonic fracture, carbon and oxygen isotopes, the Fourth Member of Funing Formation, shale oil, north Jiangsu
Basin

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