Detrital Zircon Provenance of Upper Mingyuefeng Formation in West Slope of Lishui-Jiaojiang Sag,the East China Sea
Fu Xiaowei
Zhu Weilin
Chen Chunfeng
Zhong Kai
Xu Changhai
Abstract：Sedimentary source has a significant impact on the development of oil and gas reservoir.To differentiate the prove-nance and analyze the lithological composition of the source area of the upper Mingyuefeng Formation in the west slope of Lishui-Jiaojiang sag,4 detrital zircon samples from 4 drillings were selected for U-Pb isotopic dating,and then provenance analysis was conducted according to the dating results and the age and lithology of potential source.The results suggest that de-trital zircons are mainly dominated by magmatic zircons falling into the age ranges of 125 -90 Ma,145 - 125 Ma and 1 70 -145 Ma,and there are a small amount of metamorphic zircons aged 235-210 Ma and 2 087-1 653 Ma.In the potential source area,volcanic rocks in the age range of 1 68-94 Ma are in overwhelming majority,and metamorphic rocks older than 210 Ma and intrusive rocks formed in 107.0 - 87.8 Ma outcrop sporadically,while maybe there are sedimentary rocks of Yongkang Group concentrated locally.The comprehensive analysis shows that the provenance of the northeastern part of the study area was mainly volcanic-sedimentary rocks of Yongkang Group and volcanic of Jiuliping Formation and Late Cretaceous intrusions exposed locally.While in the southwestern part,the source rock was mainly Proterozoic metamorphic rocks and volcanic rocks from Xishantou Formation in addition to Jiuliping Formation,and a small amount of Jurassic volcanic rocks as well.,which is more favorable to the development of high-quality reservoir in the southwestern part.
Keywords：detrital zircon U-Pb datingupper Mingyuefeng FormationprovenanceLishui-Jiaojiang sagsediments
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 1987-2001 )