烟雾峁地区延长组深湖细粒沉积岩岩相特征  

Deep lake fine-grained lithofacies sedimentary characteristics of Yanchang Formation in Yanwumao area

作　　者：陈玉宝[1] 叶政钦[1] 杨海龙[1] 张创[1] 周雪[1] CHEN Yubao;YE Zhengqin;YANG Hailong;ZHANG Chuang;ZHOU Xue(Yanchang Oilfield Co.,Ltd.,Yan’an 716000,China)

机构地区：[1]延长油田股份有限公司,陕西延安716000

出　　处：《西安科技大学学报》2023年第6期1110-1117,共8页Journal of Xi’an University of Science and Technology

基　　金：陕西省自然科学基础计划项目(2017JQ4018)。

摘　　要：为研究细粒沉积岩的分布、深湖的岩相划分和储层评价,寻找有利区带,选取鄂尔多斯盆地延长组长7深湖细粒沉积岩进行矿物含量、有机质含量及沉积结构等岩性特征分析,建立量化分类方案。结果表明:细粒沉积岩可分为富有机质层状页岩相、富有机质凝灰质条带泥岩相、富有机质层状泥岩相、富有机质层状粉砂质泥岩相、含有机质层状细砂岩相和含有机质块状砂岩相6种岩相类型,分别具有“一高四中一低”“两高两中两低”“一高三中两低”“五中一低”“四中两低”和“一中五低”等测井曲线特征;烟雾峁地区长7段为含有机质层状细砂岩相和含有机质块状砂岩相,物性较好,有利于致密油的聚集。分析烟雾峁致密油藏岩相特征,推测油藏有利岩相,建立不同类型的岩相,为缺乏岩芯资料井段的岩相识别提供思路。In order to clarify the distribution of fine-grained sedimentary rocks,the lithofacies classification of deep lakes,and the evaluation of sedimentary reservoirs,and to facilitate the search for favorable zones,7 deep lake fine-grained sedimentary rocks from the Yanchang Formation of the Ordos Basin were selected for analysis of lithological characteristics such as mineral content,organic matter content,and sedimentary structure,and a quantitative classification scheme was established.The results show that fine-grained sedimentary rocks can be divided into six types of lithofacies:organic rich layered shale facies,organic rich tuffaceous strip mudstone facies,organic rich layered mudstone facies,organic rich layered silty mudstone facies,layered fine sandstone facies with organic matter,and block sandstone facies with organic matter.They have logging curve characteristics such as“one high,four middle and one low”,“two high,two middle and two low”,“one high,three middle and two low”,“five middle and one low”,“four middle and two low”,and“one middle and five low”respectively;The Chang 7 section in the Yanwumao area contains organic layered fine sandstone facies and organic block sandstone facies,with good characteristics of rock facies distribution and physical properties,which are conducive to the accumulation of tight oil.By analyzing the lithofacies characteristics of tight oil reservoirs in the study area,it is inferred that the reservoir is favorable for lithofacies,and different types of lithofacies are established to provide ideas for lithofacies identification in well sections lacking core data.

关 键 词：细粒沉积岩 岩相划分 岩相测井响应特征 烟雾峁地区 

分 类 号：P618.13[天文地球—矿床学]