摘要
利用露头剖面、钻测井及地震资料,分析中上扬子地区震旦纪灯影组沉积期古构造格局、岩相古地理特征、沉积演化及其对成藏组合的控制作用。研究表明:①受罗迪尼亚超级大陆裂解影响,中上扬子地区灯影组沉积期处于伸展构造环境,碳酸盐台地产生构造分异,发育受同沉积断裂控制的台内断陷,形成了"三台两凹"的构造-古地理格局。②灯影组灯一+灯二段沉积期,发育上扬子镶边台地、台内断陷及中扬子孤立台地,川东地区存在宣汉-开江古陆;灯三段沉积期为构造-古地理转换期,在桐湾运动Ⅰ幕形成的侵蚀古地貌背景上发生海侵作用,沉积了一套富含泥质的浅水陆棚沉积;灯四段沉积期总体继承灯一+灯二段沉积期的古地理格局,德阳-安岳台内断陷进一步发展扩大,中扬子台地演变成2个孤立台地。③震旦系碳酸盐台地的构造-沉积分异及其演化形成了台缘和台内两类成藏组合,有利区分布广,勘探潜力大。
The paleotectonic pattern, lithofacies paleogeographic features, sedimentary evolution and its controlling effects on hydrocarbon accumulation assemblages during the depositional period of the Sinian Dengying Formation in middle-upper Yangtze region were investigated based on outcrops, drilling, log and seismic data. The study shows that,(1) Affected by the breakup of the Rodinia supercontinent, the middle and upper Yangtze areas were in extensional tectonic environment during the depositional period of Dengying Formation. The carbonate platform was structurally differentiated. Intra-platform depressions controlled by syndepositional faults developed, forming a tectonic-paleogeographic pattern of "three platforms with two depressions".(2) During the depositional period of the first and second members of the Dengying Formation, rimmed platforms and intra-platform fault depressions developed in upper Yangtze area and isolated platform developed in middle Yangtze area, and there was the Xuanhan-Kaijiang ancient land block in eastern Sichuan. The depositional period of the third member of the Dengying Formation is the transformation period of tectonic-paleogeographic pattern, when a set of shallow water shelf sediment rich in mud was deposited due to transgression on the background of the eroded terrain formed in EpisodeⅠof Tongwan Movement. The sediment of the fourth member of the Dengying Formation inherited the paleogeographic pattern of the first and second members of the Dengying Formation in general, but the Deyang-Anyue intra-platform fault depression further expanded, and the middle Yangtze platform evolved into two separated platforms.(3) Tectonic-sedimentary differentiation and evolution of carbonate platform in the Sinian gave rise to two types of accumulation assemblages with wide distribution and great exploration potential, which are platform margin and intra-platform.
作者
汪泽成
姜华
陈志勇
刘静江
马奎
李文正
谢武仁
江青春
翟秀芬
石书缘
李琦
WANG Zecheng;JIANG Hua;CHEN Zhiyong;LIU Jingjiang;MA Kui;LI Wenzheng;XIE Wuren;JIANG Qingchun;ZHAI Xiufen;SHI Shuyuan;LI Qi(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China;PetroChina Hangzhou Research Institute of Geology(HIPG),Xihu District,Hangzhou 310023,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2020年第5期884-897,共14页
Petroleum Exploration and Development
基金
国家科技重大专项“下古生界—前寒武系碳酸盐岩油气成藏规律、关键技术及目标评价”(2016ZX05004-001)。
关键词
构造古地理
构造分异
台内断陷
镶边台地
微生物丘滩体
震旦系灯影组
四川盆地
中上扬子地区
tectonic paleogeography
structural differentiation
intra-platform fault depression
rimmed platform
microbial mounds and shoals
Sinian Dengying Formation
Sichuan Basin
the middle-upper Yangtze region
