Tectonic setting analysis of provenance area of the Permian Jiamuhe Formation on western slope of Shawan sag,Junggar Basin
WU Chenxiao1, YAO Zongquan2,3, DELEQIATI·Janatayi 2,3, DENG Gaoshan1, LI Tianming2,3, HAO Jia1, LIU Yu1, WANG Xiaohong1, SHUGELA·Mahaxi Xiaohong2,3
1 Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Urümqi 830014,China; 2 School of Geology and Mining Engineering,Xinjiang University,Urümqi 830047,China; 3 Key Laboratory of Central Asian Orogenic Belts and Continental Dynamics,Urümqi 830047,China
Abstract：It is very controversial on the provenance system and the depositional system of the Permian Jiamuhe Formation in Shawan sag of the Junggar Basin. In this paper,cluster analysis,multidimensional scaling analysis and principal component analysis were used to analyze the contents of heavy minerals and trace elements,and it was found that it is rich in quartz(35.41%),feldspar(43.2%)and poor in rock debris(18.71%)of conglomerate clastic particles in Permian Jiamuhe Formation in Shawan sag. The average value of rare elements equal 139×10-6,which is close to the average value in the continental upper crust(i.e.,148.14×10-6),the diagram of Hf-La/Th and La/Sc-Co/Th ratio indicate that the Jiamuhe Formation belongs to the acidic island arc region. The distribution pattern of REE shows a right-leaning distribution pattern,which is characterized as rich in LREE and poor in HREE,indicating that the source rocks are mainly feldspathic volcanic rocks. There are four provenance areas including Wells XG1-ZJ6 area,Wells CP10-ZH4-ZJ3 area,Wells CP10-CP005-CP26 area,and Well CP5 area. The discriminant diagram of tectonic setting reveals that the Jiamuhe Formation was formed in continental island arc environment. This study will be helpful for the reliable estimation of sedimentary system and ancient river system of the western slope area in Shawan sag and the accurate prediction of oil and gas reservoirs in prospective areas.
WU Chenxiao,YAO Zongquan,DELEQIATI·Janatayi et al. Tectonic setting analysis of provenance area of the Permian Jiamuhe Formation on western slope of Shawan sag,Junggar Basin[J]. JOPC, 2022, 24(6): 1149-1161.
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