岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 8186.doi: 10.3969/j.issn.1673-8926.2015.05.013
王 越1,陈世悦1,梁绘媛2,邓 远1
Wang Yue1, Chen Shiyue1, Liang Huiyuan2, Deng Yuan1
摘要:
辫状河三角洲砂体是有利的油气储集砂体,深入分析其沉积特征及沉积序列对油气勘探具有重要的指导意义。 以和什托洛盖盆地侏罗系三工河组辫状河三角洲露头实测为基础,通过对各微相沉积特征和岩相类型进行分析,建立了该区辫状河三角洲的沉积序列和沉积模式。结果表明:研究区发育进积型辫状河三角洲,自下而上可划分出前辫状河三角洲、辫状河三角洲前缘和辫状河三角洲平原 3 个亚相,并可进一步细分为远砂坝、河口坝、水下分流河道、分流河道及沼泽等微相;在辫状河三角洲沉积中可识别出 8 种岩相类型,分别为粒序层理砾岩相、滞留砾岩相、不明显平行层理砾岩相、平行层理砂岩相、块状砂岩相、水平层理粉砂岩相、水平层理泥岩相和水平层理炭质泥岩相;三工河组沉积时期沉积物堆积速率大于盆地沉降速率,辫状河三角洲扇体向盆地方向不断推进并叠置在远端之上,自下而上呈现出反旋回的沉积特征。
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