REE characteristics and their significance of cave fillings of the Lower-Middle Ordovician Yingshan Formation in Yubei area,Tarim Basin
Wu Shiqiang1, Gao Xiaopeng1, Cai Xiyao1, Li Huili1, Yu Tengxiao2, Tang Pan1, 3
1 Exploration & Production Research Institute,SINOPEC,Beijing 100083; 2 Exploration and Development Research Institute,Northwest Oilfield Brance,SINOPEC,Urümqi 830011,Xinjiang 3 School of Earth Sciences and Resources,China University of Geosciences(Beijing) ,Beijing 100083
Abstract：The characteristics,evolution and distribution of palaeokarst reservoir of the Lower-Middle Ordovician are the key factors in carbonate exploration in Yubei area,Tarim Basin. Fortunately,cave fillings of the Lower-Middle Ordovician Yingshan Formation in the karst cave of Well YB7 provide the opportunity to research the palaeokarst of this period. The cave fillings were composed mostly of feldspar-quartz sandstone. Compared the characteristics of their REE element with the counterpart of the Formations of Yimugantawu,Keziertage,Donghetang,Bachu,Kepingtage and Tataaiertage,the provenance of cave fillings and the time limit of palaeocave evolution were analyzed. The results show that four cave filling samples are characterized by LREE slight enrichment,HREE slight deficit,negative Ce anomaly and positive Eu anomaly,which are similar to those of the Donghetang and Kepingtage Formations. The average ΣREE is 36.48,which is most similar to that of the Donghetang Formation,while different greatly from that of the Kepingtage Formation. Because Yubei area is located in structurally high position before the depositional period of Bachu Formation and the Kepingtage Formation in this area was missing,the Kepingtage Formation was not the provenance of the cave fillings of Well YB7. The Donghetang Formation distributes in part of western Yubei area and is missing in the vicinity of Well YB7. Based on the REE characteristics, sedimentary characteristics and structural background, it is concluded that the Donghetang Formation is the provenance of cave fillings of Well YB7, and the palaeocave was formed in the underground river system during the depositional period of Donghetang Formation to Bachu Formation.
Wu Shiqiang,Gao Xiaopeng,Cai Xiyao et al. REE characteristics and their significance of cave fillings of the Lower-Middle Ordovician Yingshan Formation in Yubei area,Tarim Basin[J]. JOPC, 2017, 19(3): 469-479.
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