天然气地球科学 ›› 2022, Vol. 33 ›› Issue (9): 14851498.doi: 10.11764/j.issn.1672-1926.2022.06.009
张力文1(),吴陈君1(),黄道军2,文志刚1,赵伟波2,席颖洋1,张辉2,孙璐1,宋换新1
Liwen ZHANG1(),Chenjun WU1(),Daojun HUANG2,Zhigang WEN1,Weibo ZHAO2,Yingyang XI1,Hui ZHANG2,Lu SUN1,Huanxin SONG1
摘要:
鄂尔多斯盆地非常规油气资源丰富,盆地东部石炭系本溪组具有良好的非常规天然气勘探潜力。沉积环境是控制天然气资源分布的重要因素,因此以鄂尔多斯盆地东部石炭系本溪组重点全井段连续岩心为基础,通过对泥页岩地层矿物组成及元素地球化学特征的研究,揭示研究区本溪组泥页岩地层古沉积水体环境特征,探讨沉积相类型对泥页岩发育的控制作用。结果表明:本溪组古沉积水体盐度自下而上先减小后增大,为咸水—半咸水沉积环境;本溪组氧化—还原敏感参数自下而上呈现先增加后降低的趋势,整体反映出本溪组为缺氧—还原环境;古水深(Rb/Zr)研究表明,本溪组古水深自下而上由较小变大再逐渐变小,呈周期性变化;CaO/(Al2O3+MgO)、CIA等古气候指标反映了本溪组自下而上温度逐渐降低,风化程度逐渐减小,其中湖田段、畔沟段、晋祠段均为炎热潮湿气候。通过对比鄂尔多斯盆地东部本溪组泥页岩矿物组成、岩性组合、地球化学特征,认为本溪组泥页岩主要沉积类型为潮间带—潟湖沉积,且泥坪—潟湖混合沉积为本溪组富有机质泥页岩发育的有利沉积环境,并在此基础上对本溪组全段地层沉积模式进行综合分析,认为湖田段为风化淤化体系下的沼泽沉积,而畔沟段、晋祠段均为障壁海岸沉积体系,沉积环境分别为潮坪—潟湖—障壁岛混合沉积与潮坪—潟湖—障壁岛—沼泽混合沉积。
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