岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 1730.doi: 10.12108/yxyqc.20220202
彭军1,2, 夏梦1, 曹飞3, 夏金刚1, 李峰3
PENG Jun1,2, XIA Meng1, CAO Fei3, XIA Jingang1, LI Feng3
摘要: 近年来,塔里木盆地顺北地区油气藏的持续发现揭示了其较大的勘探潜力。通过开展岩心观察、薄片鉴定、常规测井曲线和成像测井图像分析以及元素地球化学测试,对顺北一区奥陶系鹰山组上段与一间房组沉积环境进行了分析,结合沉积相识别标志,系统描述了研究区沉积特征,指明了优质储层类型及有利发育区。研究结果表明:①顺北一区奥陶系鹰山组上段与一间房组Mn的质量分数大于200×10-6,Sr/Ba平均值为2.025 4~3.260 2,U/Th平均值为2.02,多大于0.75,δU平均值为1.29,多大于1,显示沉积时整体处于水体由深变浅、盐度正常、温暖潮湿的弱氧化-弱还原的海相沉积环境。②研究区奥陶系鹰山组上段与一间房组为开阔台地相沉积,发育台坪和台内滩2种亚相,可细分为灰坪、云灰坪、云坪、砂屑滩、生屑滩、颗粒滩等6个微相。③研究区整体以灰坪微相为主,纵向上一间房组砂屑滩与生屑滩微相较鹰山组上段更为发育,平面上自东向西台内滩亚相发育减弱。
中图分类号:
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