Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag
Yan Jihua1, 2, Jiao Yuxi1, Chen Shiyue1, 2, Deng Yuan1, Pu Xiugang3
1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong; 2 Evaluation and Detection Technology Laboratory of Marine Mineral Resources,Qingdao National Laboratory;for Marine Science and Technology,Qingdao 266071,Shandong; 3 Research Institute of Exploration and Development,Dagang Oilfield Company,PetroChina,Tianjin 300280;
Abstract The soft-sediment deformation structures in fine-grained sedimentary rocks of deepwater lacustrine are mainly developed in strata of mudstone and micritic carbonate rocks. Most of the soft-sediment deformation structures are prone to be ignored in the core observation because of the small size(microscopic scale). The authors take Well G108-8 in the Member 2 of Eocene Kongdian Formation in Cangdong sag as research object to identify the synsedimentary micro fracture,liquefied vein,micro fold deformation,micro weight deformation,random deformation and other types of soft-sediment deformation structures through the intensive microscopic observation and elaborate core description. The soft-sediment deformation structures formed in deepwater fine-grained sedimentary rocks in the study area overall have characteristics like small scale,no association of obvious gravity flow sand body in vertical,in situ origin,sedimentary laminae developed and so on. The formation mechanism of soft-sediment deformation structures can be divided into the overlying stress unloading,lateral extrusion stress and internal stress release from the view point of the styles of stress adjustment,and the different formation mechanisms response to multiple changes of sedimentary environments. The research of soft-sediment deformation structures formed in deepwater fine-grained sediments of lacustrine can reconstruct the changes of ancient sedimentary environments and predict the gravity flow direction. It also has a great guiding significance to oil and gas exploration in the deepwater fine-grained sedimentary rocks.
Fund:Co-funded by the National Natural Science Foundation of China(No.41572087)and the Fundamental Research Funds for the Central Universities(No.15CX06004A)
About author: About the first author Yan Jihua, born in 1977, is a Ph.D. and associate professor of China University of Petroleum(East China). He is mainly engaged in research of sedimentology. E-mail: upcyanjihuo@sina.com.
Cite this article:
Yan Jihua,Jiao Yuxi,Chen Shiyue et al. Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag[J]. JOPC, 2017, 19(1): 89-98.
Yan Jihua,Jiao Yuxi,Chen Shiyue et al. Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag[J]. JOPC, 2017, 19(1): 89-98.
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