四川盆地回龙地区下侏罗统自流井组大安寨段层序地层与沉积特征研究
发布时间：2018-11-10 18:08
【摘要】：四川盆地侏罗系地层作为重要的油气勘探和开发层系,近年来在油气成藏以及富集规律方面取得了重要成果。但四川盆地不同地区的勘探程度参差不齐。四川盆地回龙地区侏罗系地层的研究对于明确川西探区侏罗系油气资源分布特征,总结其富集规律具有重要意义。本次研究的目标层位是四川盆地回龙地区大安寨段,旨在结合层序地层与沉积学研究,进行层序地层划分对比,建立该区的层序划分方案,利用沉积岩心,野外露头,测井剖面等资料划分研究区沉积微相类型,建立研究区沉积模式,为该区勘探工作提供良好的理论和基础。研究的主要内容如下:(1)早侏罗世,四川盆地进入了陆相湖盆沉积阶段,在该沉积背景下,四川盆地沉积了一套河湖相地层,其中目的层回龙地区大安寨段为陆相湖泊沉积。(2)以陆相湖盆层序地层学为指导,利用层序界面露头标志和测井识别标志,结合前人对回龙地区的划分方案,综合测井、岩心、地球物理等资料,将四川盆地回龙地区大安寨段划分为1个Ⅲ级层序和4个Ⅳ级层序(SSC1~SSC4)。详细描述了各级旋回特征,结合单井资料,建立了该研究层段的层序地层格架,为进一步的沉积相展布特征研究奠定了基础。(3)川西回龙地区自流井组大安寨段发育湖相碳酸盐岩和碎屑岩的混合沉积,结合野外露头、钻井岩心、测井和显微组构等资料的综合分析,对该研究区混积岩沉积微相特征进行了精细刻画。研究认为,回龙地区大安寨段属湖泊混合沉积相,划分为滨浅湖混合沉积和半深湖混合沉积两个亚相,并将滨浅湖划分为高能介壳滩,低能介壳滩,砂质浅滩,浅湖泥等混合沉积微相。(4)按照“岩心相-单井相-连井相-沉积相展布”的研究流程,根据研究区砂岩,泥岩和灰岩的厚度分布图以及灰岩地震相的平面展布,编制了回龙地区大安寨各层段的沉积相平面分布图。(5)基于所划分的混合沉积相的特征和四川盆地以及研究区回龙大安寨段在侏罗纪的沉积相演变过程,建立了回龙地区自流井组大安寨段混合沉积演化模式。得出结论:研究区湖相混合沉积主要受物源供给和水动力条件的控制,在不同混合沉积微相控制作用下形成了不同类型的混积岩。
[Abstract]:Jurassic strata in Sichuan Basin, as an important layer of oil and gas exploration and development, have made important achievements in oil and gas accumulation and accumulation in recent years. However, the degree of exploration in different areas of Sichuan Basin is uneven. The study of Jurassic strata in Huilong area of Sichuan Basin is of great significance in clarifying the distribution characteristics of Jurassic oil and gas resources in the western Sichuan exploration area and summing up its enrichment law. The target horizon of this study is the Da'anzhai member in Huilong area, Sichuan basin. It aims at combining sequence stratigraphy and sedimentology research, carrying out sequence stratigraphic division and correlation, establishing sequence division scheme in this area, using sedimentary core and outcrop in the field. The data of logging section and other data are divided into sedimentary microfacies types in the study area, and the sedimentary model of the study area is established, which provides a good theory and foundation for the exploration work in this area. The main contents of the study are as follows: (1) in the early Jurassic, Sichuan Basin entered the continental lacustrine basin sedimentary stage, under this sedimentary background, Sichuan Basin deposited a set of fluvial and lacustrine facies strata. Among them, the Daanzhai formation in the Huilong area is a continental lacustrine deposit. (2) the sequence stratigraphy of the continental lacustrine basin is used as a guide, the outcrop mark of sequence interface and the logging identification mark are used, and combined with the division scheme of Huilong area by predecessors, the logging is synthesized. According to the data of core and geophysics, the Da'anzhai formation in Huilong area, Sichuan Basin, is divided into one class 鈪，
本文编号：2323215
[Abstract]:Jurassic strata in Sichuan Basin, as an important layer of oil and gas exploration and development, have made important achievements in oil and gas accumulation and accumulation in recent years. However, the degree of exploration in different areas of Sichuan Basin is uneven. The study of Jurassic strata in Huilong area of Sichuan Basin is of great significance in clarifying the distribution characteristics of Jurassic oil and gas resources in the western Sichuan exploration area and summing up its enrichment law. The target horizon of this study is the Da'anzhai member in Huilong area, Sichuan basin. It aims at combining sequence stratigraphy and sedimentology research, carrying out sequence stratigraphic division and correlation, establishing sequence division scheme in this area, using sedimentary core and outcrop in the field. The data of logging section and other data are divided into sedimentary microfacies types in the study area, and the sedimentary model of the study area is established, which provides a good theory and foundation for the exploration work in this area. The main contents of the study are as follows: (1) in the early Jurassic, Sichuan Basin entered the continental lacustrine basin sedimentary stage, under this sedimentary background, Sichuan Basin deposited a set of fluvial and lacustrine facies strata. Among them, the Daanzhai formation in the Huilong area is a continental lacustrine deposit. (2) the sequence stratigraphy of the continental lacustrine basin is used as a guide, the outcrop mark of sequence interface and the logging identification mark are used, and combined with the division scheme of Huilong area by predecessors, the logging is synthesized. According to the data of core and geophysics, the Da'anzhai formation in Huilong area, Sichuan Basin, is divided into one class 鈪，
本文编号：2323215
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2323215.html
