长春油田双阳组沉积层序与储层发育特征

发布时间：2018-04-25 02:39

  本文选题：层序地层格架 + 岩相特征　； 参考：《吉林大学》2017年硕士论文

【摘要】：伊通盆地鹿乡断陷是陆相断陷盆地,位于伊通盆地郯庐断裂北侧延伸一带,其古近系双阳组双二段地层为长春油田昌10区块的勘探目的层。本文充分利用了前人研究结论,以层序地层学、沉积学等学科理论为指导,利用岩心、测井等数据,对双阳组双二段地层展开精细研究,揭示了双二段地层在其沉积时期的层序沉积特征,并在层序框架下分析其储层发育特征。1、以长春油田对双阳组双二段地层划分方案为基础,利用钻井岩心和测井曲线数据,详细研究了三级层序界面的识别标志TQ1与SQ1层序中体系域界面Tq1,重新建立双阳组双二段地层高分辨率等时地层格架,从而建立起研究区小层的划分新方案:将双二段地层划分为2个三级层序(SQ1、SQ2)、5个四级层序(S2Ⅰ、S2Ⅱ、S2Ⅲ、S2Ⅳ、S2Ⅴ)。绘制精细地层格架对比图和单砂体对比剖面图,从横向上研究双二段砂体连通性,2、详细研究了双二段取心井的岩心特征,从岩石类型、测井曲线等沉积相识别标志,总结出2种沉积亚相及7种沉积微相特征,将S2Ⅰ和S2Ⅴ砂组识别为扇三角洲前缘亚相沉积体系,S2Ⅱ、S2Ⅲ和S2Ⅳ砂组识别为扇三角洲平原亚相沉积体系。双二段含有的沉积微相为砾质河道/砂质河道、水下河道、废弃河道、溢岸砂、河口坝、远砂坝、决口扇。以此建立了双二段岩性-岩相及其组合类型的测井响应模型。并在层序框架下,揭示了横纵向砂组岩相发育规律。绘制连井沉积剖面图,为研究区储层的研究奠定了基础。3、通过对钻井岩心的研究,从岩石类型、孔隙度和渗透率特征着手,分析储层的成岩作用及孔渗类型,研究成岩作用对孔隙结构的影响,岩石经历中成岩阶段A期,成岩作用类型包括压实作用、压溶作用、胶结作用、溶解溶蚀作用和交代作用,孔隙类型包括原生孔隙、次生孔隙和次生裂缝。通过绘制各小层单砂体孔隙度和渗透率平面图,对单砂层孔渗发育规律加以研究,将双二段储层确定中孔-特低孔、中低-低渗非均质类型储层。4、区分水层与有效储层的界限,通过对各测井曲线及孔隙度、渗透率资料的研究,将油层、油水同层确定为双二段的有效储层。揭示出有效储层受层控和相控的影响,其分布与砂体骨架系统相契合,并受河道微相展布控制的特征,从而总结出双二段有效储层主要在五级层序中发育,分别集中发育于层序一和层序二的低水位体系域和高水位体系域。
[Abstract]:Luxiang fault depression in Yitong basin is a continental fault depression basin located in the northern extension of Tanlu fault in Yitong basin. The Shuangyang formation of the Paleogene system is the exploration target layer of Chang 10 block in Changchun Oilfield. This paper makes full use of the previous research conclusions, guided by the theories of sequence stratigraphy, sedimentology and other disciplines, using core, logging and other data to carry out a detailed study of the Shuangyang formation. This paper reveals the sequence sedimentary characteristics of the Shuang2 formation during its sedimentary period, and analyzes its reservoir development characteristics under the framework of sequence. Based on the plan of stratigraphic division of Shuangyang formation in Changchun Oilfield, the data of drilling core and logging curve are used. The recognition mark of the third-order sequence interface (TQ1) and the system tract interface (Tq1) in the SQ1 sequence are studied in detail, and the high-resolution isochronous stratigraphic framework of the Shuangyang formation is re-established. Thus, a new scheme for the division of substrata in the study area has been established: the double member strata are divided into two third-order sequences SQ1SQ2, and five fourth order sequences S2 鈪，

本文编号：1799416