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现代地质 ›› 2010, Vol. 24 ›› Issue (2): 294-300.

• 能源地质 • 上一篇    下一篇

塔里木盆地巴楚地区T47界面生屑灰岩微相分析及成岩作用研究

初广震1,黄文辉1,于炳松2 ,樊太亮1   

  1. 1.中国地质大学 海相储层演化与油气富集机理教育部重点实验室,北京100083;
    2.中国地质大学 地质过程与矿产资源国家重点实验室,北京100083
  • 出版日期:2010-04-20 发布日期:2010-05-10
  • 作者简介:初广震,男,博士研究生,1977年出生,石油地质学专业,主要从事碳酸盐岩储层的微相与成岩研究。 Email: chuguangzhen@cugb.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(2006CB202302)

Microfacies and Diagenesis Analysis of Bioclastic Limestones of T74Sequence Boundary in Bachu Area, Tarim Basin

 CHU  An-Shen1,HUANG  Wen-Hui1,XU  Bing-Song2, FAN  Ta-Liang1   

  1. 1.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education,China University of Geosciences, Beijing100083, China;  2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China
  • Online:2010-04-20 Published:2010-05-10

摘要:

前人对塔里木盆地巴楚地区T74界面的研究主要以在地震反射剖面中大的不整合面形式为基础进行的,对界面具体的岩性、微相和成岩作用研究较少。位于塔里木盆地巴楚县东北方向一间房地区的T74露头剖面为上奥陶统与中—下奥陶统的分界面,岩性以生物碎屑泥粒灰岩和粒泥灰岩为主。镜下分析表明:T74界面生屑灰岩中生物碎屑以棘皮动物(主要为海百合碎片)和介形虫为主,其他生物碎屑包括腕足动物、软体动物、三叶虫、钙球粒、粗枝藻、龙介虫、有孔虫、海绵和苔藓等。通过镜下微相、C-O同位素以及X射线荧光等多种分析方法,认为T74界面地层沉积相为较温暖的低能陆棚相,后期经历了埋藏压实成岩作用、地层抬升后的淡水成岩作用和风化剥蚀作用等。岩石的缝合线发育,孔渗性较好,利于地下流体的运移和渗透,对中—下奥陶统的岩溶发育起着控制作用。

关键词: 微相分析, 成岩作用, 奥陶系碳酸盐岩, 生屑灰岩, T47界面, 塔里木盆地, 巴楚地区

Abstract:

The T74 boundary outcrop profile is located in the north-east Bachu County, Tarim Basin, which separate Upper Ordovician and MiddleLower Ordovician. The lithology of this boundary is bioclasts packstones and wackstones. Based on the microfacies analysis, the bioclasts rich in biospecies mainly consist of echinoids especially in crinoids and ostrocods. Other bioclasts include brachiopod, mollusc, trilobite, calcispher, dasycladus, serpulid, foraminifera, sponges and bryozoan. Analysed by microscopes, carbone-oxygen isotope and X-ray fluorescent analysis and so on, the results show that the strata of T74boundary formed in the warm and lower energy shelf facies and subsequently experienced burial compact diagensis, meteoric diagensis and weathering diagensis following the strata uplifting. The development of stylolite with good porosity and permeability is favour of fluids movement in the subsurface and is an important factor to the development of karst in Middle-Lower Ordovician.

Key words:  microfacies analysis, diagenesis, Ordovician carbonate, bioclastic limestone, T74sequence boundary, Tarim basin, Bachu area

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