Characteristics and geologic significance of seismites in the Lower Cretaceous Laiyang Formation in northeastern Jiaolai Basin in Shandong Province
Zhou Yong1, Ji Youliang1, Wan Lu2, Pan Chunfu1
1 College of Geosciences， China University of Petroleum(Beijing)，Beijing102249 2 Geophysical Research Institute，Bureau of Geophysical Prospecting，PetroChina，Zhuozhou072751，Hebei
Abstract The Jiaolai Basin is a Mesozoic residual basin.The southern and northeastern parts of the basin were intensively affected by Tanlu and Mou-Ji Faults in the Cretaceous，and several types of deformational structures that are interpreted as seismites were formed.Based on core and outcrop observation，two types of sedimentary structures formed by seismic events were observed，including deformation structures of soft-sediments(liquefied deformation structure，stretch deformation structure，stress deformation structure)and hard rock.These sedimentary structures can be subdivided into 9 subclasses，and their genetic mechanisms were analyzed.The Mou-Ji Fault is a main fault which controlled the formation of the Jiaolai Basin，and stretched with NW-SE direction in Laiyang Formation depositional period，which caused frequent earthquake in the northeastern Jiaolai Basin.As a result，seismites were formed and were dominated by liquefied deformation of soft-sediments，which demonstrated the earthquake intensity was 5<Ms<8.A large number of micro-fractures in rocks were formed due to the earthquake，and the pores were connected by micro-fractures，which finally increased the permeability of rocks.The trigger mechanism of turbidite of the Shuinan Member can be explained as earthquake according to the discovery of seismites.Seismo-turbidites can be preserved as diagenetic traps because of dissolution caused by organic acids，which provides a new perspective and field for oil and gas exploration.
About author: Zhou Yong，born in 1984，is a Ph.D.candidate of China University of Petroleum(Beijng)and is mainly engaged in researches of sedimentology，reservoir geology and sequence stratigraphy.Tel: 010-89732217.E-mail:wszy1985@yahoo.cn.
Cite this article:
Zhou Yong,Ji Youliang,Wan Lu et al. Characteristics and geologic significance of seismites in the Lower Cretaceous Laiyang Formation in northeastern Jiaolai Basin in Shandong Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2011, 13(5): 517-528.
Zhou Yong,Ji Youliang,Wan Lu et al. Characteristics and geologic significance of seismites in the Lower Cretaceous Laiyang Formation in northeastern Jiaolai Basin in Shandong Province[J]. JOPC, 2011, 13(5): 517-528.
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