Control of petroleum traps by Cenozoic tectonic style in the Liaodong Bay area, of the Bohai Bay basin, China
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ORIGINAL PAPER
Control of petroleum traps by Cenozoic tectonic style in the Liaodong Bay area, of the Bohai Bay basin, China Mengsi Sun 1 & Chiyang Liu 1 & Shuping Chen 2 & Congjun Feng 1 & Lei Huang 1
Received: 2 July 2015 / Accepted: 11 January 2016 # Saudi Society for Geosciences 2016
Abstract Based on seismic, logging, and drilling data, we analyzed the fault system in the Liaodong Bay area of the Bohai Bay basin, China, and the basin’s evolution. In addition, we studied the local Cenozoic tectonic style, its development, and its effect on hydrocarbon trap. Our results indicate that deformed strata in the Liaodong Bay area are well represented by two layers: a shallow layer (N1g) was deformed by strikeslip and extension, and a deep layer (Eocene) was deformed by extensional effects. The three predominant types of normal faults evident in a transect of the basin are listric fault, variable-dip fault, and straight fault. The local tectonic style consists primarily of extensional, compressional, and strikeslip structures. The extensional structures developed primarily during the syn-uplift stage and affected the lower strata. The strike-slip structures developed primarily in the post-uplift stage and affected the upper strata. The inverted structures are rare, developed primarily during the transitional period, and affected the upper-middle strata. Traps formed by the extensional structures are primarily of the ancient buried hill, anticline/half-anticline, and fault-block types. Traps formed by the strike-slip structures are primarily of the fault-block and anticlinal/half-anticlinal types.
Keywords Liaodong Bay area . Fault . Tectonic style . Tectonic evolution . Trap * Chiyang Liu [email protected]
1
State Key Laboratory of Continental Dynamics, Northwest University, Taibai road 229, Xi’an 710069, China
2
College of Geosciences, China University of petroleum, Changping Fuxue Road 18, Beijing 102249, China
Introduction In recent years, controls exerted by tectonic style on basin filling and formation mechanisms have been a topic of current international tectonic geologic research (Harding and Lowell 1979; Allen et al. 1997; Polonia and Camerlenghi 2002; Sepehr and Cosgrove 2004; Zhou and Yang 2007; Lu 2008; Hickman et al. 2009; Mu and Meng 2009; Wang et al. 2010; Neng et al. 2011; Xiao et al. 2012; Duffy et al. 2013). Tectonic style formed by various mechanisms controls both basin filling and formation mechanisms and the type and distribution of hydrocarbon trap in sedimentary basin (Sanchis and Séranne 2000; Nieuwland et al. 2001; Sun et al. 2003; Sherkatia and Letouzey 2004; Zheng et al. 2008; Liu et al. 2011; Zhang and Dong 2008 Liao et al. 2013; Wang et al. 2013). The development and evolution of the Bohai Bay basin are affected by the interactions of the Indian, Eurasian, and Pacific Plates, and tectonic movements in the region are extremely complex (Liu 1988; Wu and Zhou 2000; Hou et al. 2001; Chen et al. 2007). The well-known Tan-Lu fault zone occupies a position close to the eastern edge of the B
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