Late Cenozoic Faults and Shallow Oil Accumulation in the Nanpu Sag

Abstract:

The Nanpu Sag, located in the north part of Huanghua Depression of Bohai Bay Basin, is a Cenozoic petroliferous extensional sag, the shallow oil reservoirs have great exploration potential. Former exploration suggested that there is complex relationship between Late cenozoic faults and hydrocarbon accumulation, but there is no detailed discussion. Based on the structural interpretation of 3D seismic data, the Late Cenozoic fault characters including typical fault configuration in profile and fault arrays in plane are analyzed, furthermore, the formation mechanism of the faults is discussed. It is concluded that late Cenozoic faults were formed by extension other than strike-slip movement, which was controlled by the mechanism of pure shear in the lower crust during the period. In addition, the relationship between Late Cenozoic faults and shallow hydrocarbon accumulation is discussed, it indicates that the faults controlled the formation of shallow closures and constituted the effective hydrocarbon pathways connecting deep source rock and shallow traps.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 129-134
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.129
• Online since: August 2013
• Authors: Tian Wei Zhou*, Ze Hong Cui, Hai Hui Ming, Hai Long Xu, Yu Xia Xin
• Keywords: Hydrocarbon Accumulation, Late Cenozoic Faults, Nanpu Sag, Shallow Reservoir

References

[1] Anna Xu, Hongxia Zheng, Yuexia Dong, et.al. Sequence stratigraphic framework and sedimentary facies prediction in Dongying Formation of Nanpu Sag[J]. Petroleum Exploration and Development, 2006, 33(4): 437-443."in Chinese".

[2] Haimin Zhou, Wei Zhang, Zhanan Xie, et.al. Geologic meaning and key techniques of 3-D large-area multiple-block-jointed pre-stack time migration processing in fault basin [J]. Oil Geophysical Prospecting, 2005, 40(6): 693–699."in Chinese".

[3] Jiafu Qi. Two tectonic systems in the Cenozoic Bohai Bay basin and their genetic interpretation[J]. Chinese Geology, 2004, 31(1): 15-22."in Chinese".

[4] Zhanan Xie, Haimin Zhou.Acquisition technologies for second round of 3D seismic survey in Gaoliu, Nanpu Sag [J].Petroleum Exploration and Development, 2006, 33(4):444-447."in Chinese".

[5] Larsen P H. Relay structures in a lower Pemian Basement-involved tension system in east Greenland[J]. Journal Structrual Geology, 1988, (10): 3-8.

DOI: 10.1016/0191-8141(88)90122-8

[6] McClay K R, Ellis P G. Analogue models of extensional fault geometries[M]// Coward M P, Dewey J F, Hancock P L. Continental Extensional Tectonics. London: Geological Society Special Publication, 1987: 109-125.

DOI: 10.1144/gsl.sp.1987.028.01.09

[7] McClay K R. Physical models of structural styles during extension[C]// Tankard and Balkwill. Extensional Tectonics of the North Atlantic Margins. AAPG Memoir 46, 1989.

DOI: 10.1306/m46497c7