澳大利亚北卡那封盆地中上三叠统Mungaroo三角洲陆源有机质分布特征

doi:10.7605/gdlxb.2014.02.018

古地理学报 ›› 2014, Vol. 16 ›› Issue (2): 193-204. doi: 10.7605/gdlxb.2014.02.018

澳大利亚北卡那封盆地中上三叠统Mungaroo三角洲陆源有机质分布特征

李丹^1,2,3, 杨香华^1,2, 常吟善^1,2, 刘浩冉^1,2, 许晓明³, 朱光辉³

1 中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉 430074;
2 中国地质大学(武汉)资源学院,湖北武汉 430074;
3 中国海洋石油研究总院,北京 100027

收稿日期:2013-07-29 修回日期:2013-10-24 出版日期:2014-04-01 发布日期:2014-04-01
通讯作者: 杨香华,男,1964年生,教授,主要从事沉积学、层序地层学及储集层预测方向的教学与科研工作。电话:027-67883563;E-mail:xhyang111@vip.sina.com。
作者简介:李丹,女,1988年生,中国地质大学(武汉)硕士研究生,研究方向为沉积学、层序地层学及储集层预测。E-mail:lidan_1233@126.com。
基金资助:
国家科技重大专项子课题“澳大利亚西北陆架油气成藏条件及勘探潜力研究”(编号:2011ZX05030-02-02)资助

Distribution of the Upper Triassic terrigenous organic matter in Mungaroo delta of North Carnarvon Basin, Australia

Li Dan^1,2,3, Yang Xianghua^1,2, Chang Yinshan^1,2, Liu Haoran^1,2, Xu Xiaoming³, Zhu Guanghui³

1 Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074, Hubei;
2 Faculty of Earth Resource,China University of Geosciences(Wuhan),Wuhan 430074, Hubei;
3 CNOOC Research Institute,Beijing 100027

Received:2013-07-29 Revised:2013-10-24 Online:2014-04-01 Published:2014-04-01
About author:Li Dan,born in 1988,is a master degree candidate of China University of Geosciences(Wuhan),and she is mainly engaged in sedimentology, sequence stratigraphy and reservoir prediction. E-mail:lidan_1233@126.com. About the corresponding author Yang Xianghua, born in 1964,professor of China University of Geosciences(Wuhan),and he is mainly engaged in sedimento￣logy,sequence stratigraphy and reservoir prediction. E-mail:xhyang111@vip.sina.com.

摘要/Abstract

摘要： 北卡那封盆地中上三叠统Mungaroo组发育巨型浅水辫状河三角洲——Mungaroo三角洲。利用钻井、岩心资料,并结合区域地质背景,将Mungaroo三角洲划分为近端三角洲平原、远端三角洲平原、三角洲前缘、前三角洲4个沉积亚相,其中近端三角洲平原与远端三角洲平原亚相分布广泛,三角洲前缘与前三角洲亚相欠发育。陆源有机质分析表明:(1)研究区目的层段沉积时期,在环特提斯洋巨型季风洪水的影响下,泥炭沼泽普遍遭受冲刷改造,有机质类型主要为分散有机质,仅远端三角洲平原发育薄煤层;(2)不同相带受季风洪水的影响差异较大,近端三角洲平原受洪水改造强烈,砂砾岩发育,夹薄层泥岩,泥岩中有机质显微组分主要为惰质组,镜质组大部分遭受氧化;(3)远端三角洲平原的沼泽沉积尽管受到洪水频繁冲刷,但仍发育多套薄煤层,泥岩中陆源有机质最为丰富,显微组分以镜质组为主;(4)三角洲前缘和前三角洲相带窄,沉积物中陆源有机质含量较低。远端三角洲平原烃源岩有机质生烃潜力最大,除发育广泛的薄煤层外,暗色泥岩中平均TOC含量可达4.11％。上述沉积相带与陆源有机质分布规律体现了强季风洪水影响下大型辫状河三角洲的沉积特点。

关键词: 澳大利亚, 北卡那封盆地, Mungaroo三角洲, 沉积相, 陆源有机质

Abstract: The giant shallow water braided fluvial delta, Mungaroo delta, was developed in the Mungaroo Formation in North Carnarvon Basin during the Middle and Upper Triassic. Based on logging data and core data,together with the regional geological setting,the Mungaroo delta is divided into four sedimentary sub-facies,including the proximal delta plain,the distal delta plain,the delta front and the prodelta. The proximal delta plain and the distal delta plain are widely spread,while the delta front and the prodelta are underdeveloped. Analysis of the terrigenous organic matter in the different sub-facies suggests that: (1)During the deposition of sediments, the peat bog underwent a scouring transformation due to the influence of the circum-Tethys giant monsoon flood,hence the organic matter is mainly dispersed and the thin coal strata is only developed in the distal delta. (2)The influence of monsoon floodvary greatly from sub-facies to sub-facies. The proximal delta plain was transformed intensively by the flood and was rich in glutenite although thin mudstone could also be found in it. The maceral of the mudstone is mainly inertinite because most of the vitrinite was oxidized. (3)Although the marsh sediments in the distal delta plain underwent frequent scour of the flood,there are still many thin coal beds developed in dark mudstone. The content of terrigenous organic matter in the mudstone is highest with vitrinite as the main type. (4)The delta front and the prodelta are narrow. The terrigenous organic matter content is low in these facies. The distal delta plain is the most potential hydrocarbon-generating facies of the four facies and its average total organic carbon(TOC) content can be up to 4.11％. The terrigenous organic distribution reflects that the braided river delta sedimentary features underwent a megamonsoon influence.

Key words: Australia, North Carnarvon Basin, Mungaroo Delta, sedimentary facies, terrigenous organic matter

中图分类号:

P588.21

李丹, 杨香华, 常吟善, 刘浩冉, 许晓明, 朱光辉. 澳大利亚北卡那封盆地中上三叠统Mungaroo三角洲陆源有机质分布特征[J]. 古地理学报, 2014, 16(2): 193-204.

Li Dan, Yang Xianghua, Chang Yinshan, Liu Haoran, Xu Xiaoming, Zhu Guanghui. Distribution of the Upper Triassic terrigenous organic matter in Mungaroo delta of North Carnarvon Basin, Australia[J]. JOPC, 2014, 16(2): 193-204.

http://www.gdlxb.cn/CN/Y2014/V16/I2/193

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澳大利亚北卡那封盆地中上三叠统Mungaroo三角洲陆源有机质分布特征

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澳大利亚北卡那封盆地中上三叠统Mungaroo三角洲陆源有机质分布特征

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