中国地质2023，Vol.50Issue(6)：1848-1856,9.DOI:10.12029/gc20200523001
松辽盆地腰南5井上白垩统嫩江组一段遗迹化石组合及其沉积环境
Nenjiang Formation 1 member Ichnocoenosis and its deposit environment of Upper Cretaceous from Yaonan 5 well,Songliao Basin
摘要
Abstract
This paper is the result of oil and gas exploration engineering. [Objective]Abundant trace fossils were preserved in Upper Cretaceous strata in Songliao Basin,but related studies mainly focus on the northern part of the Songliao Basin.The sedimentary environment of section 1 of the Nenjiang Formation was restored by trace fossils identification in the southern part of the Songliao Basin,and this paper will provide evidence to support subsequent trace fossil studies in this area.[Methods]According toobserve wells of Yaonan 5 drill core of section 1 of the Nenjiang Formation,we identified 2 ichnogenus and 2 ichnospecies including Chondrites and Planolites,and established Chondrites-Planolites ichnocoenosis.Combining with ichnofossils surrounding rock,burrow scale,record of well logging curve to analyse trace maker habit;According well of Yaonan 5 sampling,measured sample contents of Uranium,Thorium,Vanadium,Nickel and Cobalt;Using U/Th,V/(V+Ni)and Ni/Co methods to restore trace fossil preservation strata paleo-oxygen facies of section 1 of the Nenjiang Formation.[Results]This study suggests that Chondrites-Planolites ichnocoenosis were formed in deep water environment with weak water energy;Paleo-oxigenation facies data analysis suggests that method of U/Th indicated oxic environment,methods ofV/(V+Ni)and Ni/Co indicated dysaerobic-anaerobic environment.[Conclusions]The trace fossils were preserved in mudstone in well Yaonan 5 with small burrow diameter scale and low abundance,indicating the water was anoxic.Combined with the paleo-oxygen facies data and logging curve analysis,considering that tracemaker were living in semi-deep lake which with low energy and poor oxygen content.关键词
遗迹化石/嫩江组/沉积环境/油气勘查工程/松辽盆地Key words
trace fossils/Nenjiang Formation/sedimental environment/oil and gas exploration engineering/Songliao Basin分类
天文与地球科学引用本文复制引用
荆锡贵,李凤杰,张达,李宁,苗贺,丁锐..松辽盆地腰南5井上白垩统嫩江组一段遗迹化石组合及其沉积环境[J].中国地质,2023,50(6):1848-1856,9.基金项目
中国石油化工股份有限公司科技部项目"东北地区油气资源潜力与选区评价研究(P22062)"资助. Supported by Sinopec Science and Technology Department for the project"Study on the Evaluation of Oil and Gas Resource Potential and Areas Selection in Northeast China(No.P22062)". （P22062）
