【摘 要】
：
以三塘湖盆地马朗凹陷二叠系芦草沟组为例,通过高分辨率岩心图像扫描、常规薄片、扫描电镜、能谱分析等岩石学研究方法,结合微量元素、生物标志化合物等地球化学指标,对湖相
【机 构】
：
东北石油大学“非常规油气成藏与开发”省部共建国家重点实验室培育基地,黑龙江省高等学校“断裂变形、封闭性及与流体运移”科技创新团队,中国石油吐哈油田公司,西安石油大学地球科学与工程学院
论文部分内容阅读
以三塘湖盆地马朗凹陷二叠系芦草沟组为例,通过高分辨率岩心图像扫描、常规薄片、扫描电镜、能谱分析等岩石学研究方法,结合微量元素、生物标志化合物等地球化学指标,对湖相富有机质纹层状细粒岩的岩石学特征、沉积成因进行了研究,并分析了其页岩油气/致密油气勘探意义.研究结果表明,纹层具有硅质碎屑富集层、碳酸盐富集层、凝灰质富集层及有机质富集层4种类型,通过组合可以形成3种层偶类型.有机质呈纹层状富集或分散状分布于碳酸盐纹层及凝灰质纹层中.缺少陆源碎屑供给的封闭盐湖沉积体系,形成了分层的古湖泊水体,加之湖底的热水活动和季风性气候共同控制了有机质的富集保存及湖相多元纹层状细粒岩的形成.由于该类细粒岩有机质丰度高,具有较好的生烃潜力,碳酸盐纹层微孔及纹层间微裂缝发育,使其具有丰富的储集空间类型,且脆性矿物含量高而易于后期压裂改造,具备形成页岩油气/致密油气的有利条件,勘探意义重大.
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