塔河地区鹰山组高精度层序划分及沉积模式  

High-precision sequence division and sedimentary model of Yingshan Formation in Tahe area

作　　者：卫端 高志前[1,2] 孟苗苗[1,2] 杨孝群[1,2] 王静彬 王珊珊[1,2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083

出　　处：《岩性油气藏》2016年第6期68-77,共10页Lithologic Reservoirs

基　　金：国家自然科学基金项目"塔里木盆地早中奥陶世台内滩储集体形成机制及分布规律"(编号:41102087)资助

摘　　要：鹰山组作为塔河油田重要的接替产层受到广泛关注,但对塔河地区鹰山组高精度层序划分及沉积模式研究较薄弱。利用大量薄片、测井和地震资料,开展高精度层序划分和沉积微相分析,将塔河地区鹰山组划分为2个三级层序(SQ1和SQ2),通过不整合面和地层叠加样式,将鹰山组进一步划分为4个四级层序。识别出塔河地区鹰山组Mf1—Mf 7共7种沉积微相类型,概括出台内中—高能滩型(MA1)、台内低能滩—滩间海型(MA2)和台内潮坪型(MA3)等3种沉积微相组合序列。在高精度层序及沉积微相对比与分析的基础上,归纳出了鹰山组的沉积模式:SQ1沉积时期,研究区整体为局限台地环境,主要发育台内中—高能滩型微相组合序列和台内潮坪型微相序组合序列;SQ2沉积时期,研究区由局限台地过渡为开阔台地环境,主要发育台内低能滩—滩间海型微相组合序列。平面上,越靠近台缘亚相,台内中—高能滩微相沉积越发育。The Yingshan Formation is of great scientific interest for being the significant replacing productive for- mation in Tahe Oilfield. However, the researches on high-precision sequence division and the sedimentary model are inadequate. Based on the thin sections, well logging and seismic data, the Yingshan Formation in Tahe area was divided into two third-order sequences （SQ1 and sQ2）, and it was further divided into four fourth-order sequences through the identification of unconformity and stratigraphic stacking patterns. Seven microfacies （Mfl-MfT） were recognized and three microfacies assemblagses （MA1-MA3） were summarized, including platform interior interme- diate-high energy bank （MA1）, platform interior low energy bank and intrabank sea （MA2） and platform interior tidal fiat （MA3）. Based on the microfacies analysis and correlated with wells, the sedimentary model of the Ying- shan Formation was analyzed. During the SQ1 period, it was restricted platform environment, and the MA1 and the MA3 developed. During the SQ2 period, it transferred to open platform gradually, the MA2 was the dominant microfacies assemblage. The closer to the platform margin, the more platform interior intermediate-high energy bank （MA 1 ） developed.

关 键 词：层序划分 沉积微相 沉积模式 鹰山组 塔河地区 

分 类 号：P539.2[天文地球—古生物学与地层学]