Provenance features of the Quaternary Qigequan Formation in Sanhu area, Qaidam Basin
YI Dinghong1, LIU Yingru1, LI Jiyong2, LIU Junfeng2, KUI Mingqing2, CHEN Fenjun2, WU Yanxiong2, ZHANG Tingjing1, LI Hongzhe1, NI Shuai2
1 PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020, China; 2 Qinghai Oilfield Company, PetroChina, Gansu Dunhuang 736202, China
Abstract：To assess the potential for natural gas exploration in the Quaternary Qigequan Formation in the Sanhu area of the eastern Qaidam Basin and identify favorable lithologic gas reservoir exploration zones and targets,this paper systematically analyzes the provenance composition of the Qigequan Formation in the area. By examining parameters such as heavy mineral assemblage,ZTR index,stability coefficient of heavy mineral sand sandstone clastic composition,the study determines the provenance direction and reconstructs the parent rock type. The findings reveal that the stability coefficient and ZTR index of heavy minerals in the Sanhu area increased from the margin to the center of the Qaidam Basin during the sedimentary period of the Qigequan Formation,which was roughly distributed in a ring belt. The study identifies different main heavy mineral assemblages in various source areas and significant variations in the content of unstable heavy minerals. The study indicates that the Golmud provenance flows in a north-west direction,influencing the southern part of the Sebei area,while the Wutumeiren provenance has a smaller scale and flows northeast,impacting the southwestern part of the Tainan area and the Senan 3 well area. Additionally,the study shows that the provenance scale of Mt. Xitieshan-Emnik and Mt. Lvliang is limited,with distinct effects on surrounding regions. The Tainan-Sebei area is primarily influenced by the Wutumeiren provenance and Golmud provenance. This study establishes that the Sanhu area in the Qaidam Basin is characterized by the Wutumeiren provenance and Golmud provenances. The Kunlun Mountain gentle slope provenance system,the Qilian Mountain steep slope provenance system made up of the Xitieshan-Emnike Mountain source and the Lvliang Mountain source,and the blended source system in the Tainan-Sebei area within the basin can offer direction for natural gas exploration and development in this region.
YI Dinghong,LIU Yingru,LI Jiyong et al. Provenance features of the Quaternary Qigequan Formation in Sanhu area, Qaidam Basin[J]. JOPC, 2024, 26(3): 644-654.
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