Neogene Strike-Slip Fault and Hydrocarbon Accumulation in Eastern Offshore Bohai Bay Basin

Qiang, Kunsheng¹; Lü, Xiuxiang²; Zhou, Xinhuai³; Xu, Changgui³; Lan, Xiaodong¹
¹College of Goesciences, China University of Petroleum(Beijing), Beijing, China.
²Basin & Reservoir Research Center, China University of Petroleum(Beijing), Beijing, China.
³Tianjin Branch, CNOOC, Tianjin, China.

Late strike-slip movements of the Tan-Lu fault zone promoted oil/gas accumulation during the late Neogene in the eastern offshore Bohai Bay Basin, and contributed to the dynamic balance of oil and gas accumulation and late-forming of reservoir. This study makes use of a diverse data set, including 2D and 3D seismics, wireline logs, cores, well testing data to generate a number of geological phenomena in order to assess the relationship between Neogene strike-slip fault and oil/gas accumulation in the eastern offshore Bohai Bay Basin, Neogene dextral strike-slip movement was conducive to the rapid maturation of source rocks. New tectonic movement provided a new impetus for the late accumulation of oil and gas. Along with the main strike-slip fault activities a large number of structural traps were formed, controlling oil/gas accumulation in shallow horizons during the late stage. Significant growth of Neogene E-W direction faults provided the migration pathway and preservation condition for shallow oil and gas reservoirs. In addition, natural seismic activity along the Tan-Lu fault zone could also be a driving force for oil/gas accumulation during the Neotectonic movement. Consequently, Neogene Tan-Lu fault strike-slip movement had great significance in the shallow oil/gas accumulation in eastern Bohai Sea, which has been confirmed by oil and gas exploration practice.

AAPG Search and Discovery Article #90155©2012 AAPG International Conference & Exhibition, Singapore, 16-19 September 2012