岩性油气藏 ›› 2019, Vol. 31 ›› Issue (1): 2029.doi: 10.12108/yxyqc.20190103
傅强1, 李璟1, 邓秀琴2, 赵世杰1, 庞锦莲2, 孟鹏飞1
FU Qiang1, LI Jing1, DENG Xiuqin2, ZHAO Shijie1, PANG Jinlian2, MENG Pengfei1
摘要: 鄂尔多斯盆地华庆地区长6油层组的厚层砂岩为深水沉积。为研究该地区深水沉积过程和岩石成因机理,基于岩心观察、测井和录井资料以及岩石样品的分析测试资料,对华庆地区长6油层组深水沉积物在沉积期所遭受的重力流事件、火山事件、地震事件和缺氧事件进行了系统研究。结果表明:①重力流沉积事件在整个沉积过程中频繁发生,是造成砂体在深湖区大面积多层堆积的直接原因;②火山活动的强度和影响范围相对于长7油层组沉积期较小,凝灰质泥岩平均厚度仅为1.74 m,且主要分布在长62~63砂层组中,形成凝灰质泥岩的火山灰主要以河流搬运方式进入湖盆沉积;③岩心上的沉积构造特征反映了地震事件频繁发生,推测震级约为4.5~5.5级;④上述地质事件的共同作用导致了沉积期湖盆的缺氧事件的发生,致使深湖区沉积了富含有机质的烃源岩,与储集砂体在纵向上构成了良好的生储盖组合。
中图分类号:
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