四川盆地震旦系灯影组岩相古地理与沉积模式

发布时间：2018-02-25 19:30

本文关键词： 四川盆地震旦纪德阳—安岳台内裂陷岩相古地理沉积模式台缘带裂陷边缘台缘带　出处：《天然气工业》2017年01期 　论文类型：期刊论文

【摘要】：为指导四川盆地安岳古老碳酸盐岩特大型气田有利储集相带的展布预测,从构造和岩相古地理分析入手,结合野外露头剖面、钻井和地震资料,重建了该盆地震旦系灯影组岩相古地理及其沉积模式,取得了4项研究成果:①盆地及其周缘震旦纪处于伸展构造环境,强烈的伸展作用导致德阳—安岳台内裂陷的形成,其最终将四川盆地分隔成"两隆四凹"的古地理格局,"两隆"演化为台地,"四凹"演化成斜坡—盆地环境;②灯二期发育大陆边缘丘滩、裂陷边缘丘滩及台内丘滩等有利储集相带,裂陷边缘丘滩沿德阳—安岳裂陷两侧发育,呈U形分布,宽5~40 km、长约500 km,向西在什邡一带、向北在广元附近与大陆边缘台缘带相接;③灯四期继承了灯二期的岩相古地理特点,但由于德阳—安岳裂陷不断向南张裂,并最终贯穿盆地南北,裂陷边缘台缘带演化成东西2条,东部台缘带分布在广元—盐亭—安岳—泸州一带,南北向展布,长约450 km、宽4~50 km,西部台缘发育在都江堰—成都—威远—宜宾—马边一带,呈向东凸出的弧状分布,长约300 km、宽4~30 km;④建立了灯影组"双台缘"镶边台地沉积模式,指导了有利储集相带的展布预测。
[Abstract]:In order to guide the distribution and prediction of favorable reservoir facies in Anyue ancient carbonate gas field in Sichuan Basin, starting with structural and lithofacies paleogeography analysis, combined with outcrop profile, drilling and seismic data, The lithofacies paleogeography and sedimentary model of the Dengying formation of the Sinian system in this basin have been reconstructed, and four research results have been obtained. The basin and its surrounding Sinian are in an extensional tectonic environment. The strong extensional process resulted in the formation of the Deyang-Anyue platform rift depression. In the end, the Sichuan basin is divided into a paleogeographic pattern of "two uplift and four concave", "two uplift" evolves into a platform, and "four concave" evolves into a slope-basin environment, the second stage of which develops the continental margin hilly beach. There are favorable reservoir facies zones such as margin shoal and terrace hilly beach, which develop along both sides of Deyang-Anyue rift, with U-shaped distribution, 540 km wide and about 500 km long. They are located in Shifang area to the west. The northward connection with the margin zone of the continental margin near Guangyuan inherits the lithofacies paleogeographic features of the second phase of the lantern, but because the Deyang-Anyue rift depression is constantly spreading southward, it eventually runs through the north and the south of the basin. The platform margin of the rifting margin evolved into east-west two, and the eastern margin was distributed in the area of Guangyuan-Yanting-Anyue Luzhou, spreading from north to south, about 450 km in length and 450 km in width. The western margin developed in Dujiangyan, Chengdu, Weiyuan, Yibin and Mambian areas. The sedimentary model of the "double platform margin" edge platform of the Dengying formation is established, which indicates the distribution and prediction of favorable reservoir facies belt.
【作者单位】：中国石油杭州地质研究院;中国石油天然气集团公司碳酸盐岩储层重点实验室;
【基金】：国家科技重大专项(编号:2016ZX05004-002) 中国石油天然气集团公司科技重大专项(编号:2014E-32)
【分类号】：P618.13;P534.31

【相似文献】