Identification methods and features of unconformity within carbonate successions of the Lower-Middle Ordovician Yingshan Formation in Tahe area,Tarim Basin
Wei Duan1, 2, Gao Zhiqian1, 2, Yang Xiaoqun1, 2, Meng Miaomiao1, 2, Chen Yue3, Dong Zhenkun1, 2, Wang Shanshan1, 2
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 2 Ministry of Education Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,China University of Geosciences(Beijing),Beijing 100083; 3 Research Institute of Experimental Geology,CNSPC,Wuxi 214151,Jiangsu;
Abstract：This paper integrates outcrops,well log and seismic data to describe the features of unconformity T67 within the Yingshan Formation in Tahe area, Tarim Basin. The unconformity T67 is characterized by lithofacies transitional surface at outcrops. δ13C and δ18O values below the unconformity T67 are significantly more negative,the same as the trace elements of Sc,Co,Ni,Ba,U,and Sr. The contents of Li and V below the unconformity T67 are relatively high. The GR logs in the lower part of the Yingshan Formation are more variable and have higher values. The Th/U values amended by filtering method are low at the section of unconformity T67 . It is difficult to identify the unconformity T67 based on the phenomena of reflection termination such as truncations,onlap and toplap in seismic profile,but some “beads-like” reflection anomalies are found along the unconformity T67 surface. These “beads-like” reflections are interpreted to indicate karst-relate palaeo-caverns. The unconformity T67 results from a short-term exposure(<1,Ma)and is controlled by sea-level changes and the palaeogeomorphology. The exposure degree of the unconformity T67 is variable in Tahe area,with the largest in the middle-east part,and the lowest in the northwest part. The unconformity T67 has great importance for the formation of carbonate reservoirs in the Yingshan Formation. It not only can provide the geological background for the interlayer karst development,but also can connect the fracture system to provide channels for the meteoric water flowing.
Wei Duan,Gao Zhiqian,Yang Xiaoqun et al. Identification methods and features of unconformity within carbonate successions of the Lower-Middle Ordovician Yingshan Formation in Tahe area,Tarim Basin[J]. JOPC, 2017, 19(3): 457-468.
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