林煜,吴胜和,岳大力,闫军生,李斌,王丽琼
LIN Yu,WU Sheng-he,YUE Da-li,YAN Jun-sheng,LI Bin,WANG Li-qiong
摘要:
扇三角洲储层是一类重要的油气储层,其可动剩余油储量占我国碎屑岩储层可动剩余油储量的17.4%。目前国内关于扇三角洲储层,特别是扇三角洲前缘储层的构型研究甚少,难以满足此类油藏剩余油分布预测的需要。为此,以辽河油田曙2-6-6区块杜家台油层为例,应用岩心、测井和动态资料,分析了扇三角洲前缘储层构型单元的特征,明确了构型的分级系统,开展了复合砂体和单一砂体级次的构型解剖。研究表明:①研究区发育的储层构型单元包括辫状水道、河口坝和溢岸,不同构型单元形成的复合砂体存在3种平面分布样式。②复合砂体内部单一砂体的识别主要依据其垂向和侧向识别标志,其中垂向识别标志包括钙质夹层和泥质夹层2种,侧向识别标志包括曲线特征区域差异、砂体侧向叠置等6种。③不同类型单一砂体的规模分布存在差异,其中辫状水道厚度介于0.8~6.6m之间,宽度介于100~400m之间;河口坝厚度介于1.2~6m之间,宽度介于200~710m之间,2类砂体的宽厚之间均呈现较好的指数关系。最终,依据研究区储层构型的定性及定量解剖成果,建立了符合地质模式的三维构型模型,为寻找剩余油及挖潜提供了可靠的地质依据。
中图分类号:
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