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

doi:10.11885/j.issn.1674-5086.2014.08.27.02

Abstract

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

CLC Number:

TE112

WANG Haifang*. Recognition of Effective Fractures Within the Oil Shale in the Fourth#br# Member of Funing Formation in Northern Jiangsu Basin[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.08.27.02.

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

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