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四川盆地中北部下—中侏罗统主要目的层 沉积相与地震沉积学
Sedimentary Faces and Seismic Sedimentology for the Main Exploration Targets of Lower—Middle Jurassic in the Northern Part of Central Sichuan Basin
赵霞飞1 赵拓宇2 张闻林3 袁 倩3
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作者单位:1. 成都理工大学能源学院 2. 中国石油工程建设有限公司西南分公司 3. 中国石油西南油气田公司勘探开发研究院
中文关键字:四川盆地 早—中侏罗世 河流—三角洲相 湖相 瓣腮类生态 地震沉积学 比较沉积学
英文关键字:Lower—Middle Jurassic,river-delta and lacustrine facies,bivalves ecology,delta seismic sedimentology
中文摘要:    四川盆地中北部油气主要勘探目的层包括下侏罗统自流井组大安寨段、中侏罗统凉高山组和下沙溪庙组,沉积相属于河流—三角洲相和湖相。根据岩心和录井资料,应用沉积地质学理论确定了三角洲的以下几种微相:砂质辫状河、大分流河道、小分流河道、河口坝、三角洲前缘波浪带、沿岸沙坝、前三角洲等。侏罗纪湖泊为有出水口的开放型淡水湖,利用地震沉积学原理预测了由沿岸泥坪、滨线、介屑(壳)滩、沿岸带(沙坝)到远滨席状砂、开阔湖透光带等9 种微相。应用比较沉积学原理和工作方法,参照云南滇池和洱海现代瓣腮类珠蚌、无齿蚌的生态,分析了侏罗纪瓣腮类(珠蚌、假铰蚌)的生态。瓣腮类以藻类为食,而藻类则附生于沉水植物上。湖水深度(制约水的透光度)和底质是制约水草生长的因素,因而制约瓣腮类分布。估计了大安寨期瓣腮类生活的水深。应用地震沉积学工作方法,发现大安寨期的介壳滩被断层活动引起的沟槽、水道划分成多个独立单元,而所作出的凉高山期三角洲与由现代实例得出的经典模式不谋而合,证明研究成果可信度高,可据此准确地预测地下储层分布。
英文摘要:    In the Northern part of Central Sichuan Basin, the main exploration targets include Lower Jurassic Daanzhai Member, Lianggaoshan Formation and Middle Jurassic Lower Shaximiao Formation. They are attributed to river-delta and lacustrine facies in origin. According to the studies of core-sections and well-logging data, the following microfacies have been confirmed :sandy braided river, major distributary channel, minor distributary channel, mouth-bar, wave-zone in delta-front, longshore bar and prodelta. The Jurassic lakes should be open fresh-water ones with outlets. Nine tYPes of microfacies havc been speculated: longshore mud flat, shoreline, shell-debris shoal, longshore bar to offshore sand-sheets, open-lake transparent zone. Referring the ecology of modern bivalves (Unionea, Anodonta) in Dianchi Lake and Erhai Lake in Yannan Province, the Jurassic bivalves (Unionea, Pseudocardinia) werestudied concerning their living behaviours. Bivalves are feeding on algaes which are relying on subaquatic plants. Depth of lake water (controlling the transparency of the water columm) and substrates are two main factors controlling subaquatic plants growth, so as to controlling distribution of the bivalves. The appropriate water depth for Daanzhai stage was estimated. On the seismic sedimentology, the Daanzhai shell-shoal was discovered to be divided by ditches and channels into independent units, and the Lianggaoshan delta happened to coincide with the classic model.Suggesting the high reliability, our studies precisely direct the undergroumd distribution of the reservoirs.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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