本文選題：細粒沉積 + 有機質(zhì)類型��； 參考：《地質(zhì)科技情報》2017年01期

【摘要】：在大量鉆井、測井資料的基礎(chǔ)上,采用巖心分析、地球化學測試等方法,從湖泊演化過程中水體鹽度、氧化還原條件、生產(chǎn)力變化及地球化學特征等方面,對鄂爾多斯盆地隴東地區(qū)細粒沉積物特征、分面規(guī)律及其主控因素進行了研究,取得的主要認識有:鄂爾多斯盆地隴東地區(qū)延長組長7段沉積期,氣候溫暖潮濕,半深湖-深湖大面積分布,富有機質(zhì)細粒沉積物發(fā)育,該期形成的富有機質(zhì)頁巖主要受湖盆底形、砂體沉積模式的影響。尤其長73亞段沉積期為細粒沉積物主要發(fā)育期,快速湖侵,湖水深度和范圍急劇增加,湖泊表層水體與底層水體存在鹽度分層,形成大面積缺氧環(huán)境,有利于大規(guī)模發(fā)育富有機質(zhì)頁巖。深湖區(qū)平緩地帶,陸源碎屑供給不足,有機碳含量高,有機質(zhì)類型好(以Ⅰ、Ⅱ型為主),半深湖區(qū)斜坡帶發(fā)育物源來自于陸地的粉砂質(zhì)泥巖,干酪根以Ⅱ型為主,同時發(fā)育Ⅲ型干酪根。
[Abstract]:On the basis of a large amount of drilling and logging data, core analysis, geochemical testing and other methods are used to analyze the salinity of water body, redox conditions, productivity changes and geochemical characteristics in the process of lake evolution. The characteristics of fine grained sediments in Longdong area of Ordos Basin are studied. The main results are as follows: the sedimentary period of Chang 7 in Longdong region, Ordos Basin, the climate is warm and humid. The semi-deep lacustrine and deep lake distributed in large area, and the organic matter rich shale formed in this period was mainly influenced by the lacustrine basin bottom and the sedimentary model of sand body. Especially, the deposition period of Chang73 submember is the main developing period of fine grain sediments, which is characterized by rapid lake transgression, sharp increase in depth and range of lake water, and stratification of salinity between the surface and bottom water of the lake, which forms a large area of anoxic environment. It is conducive to the large-scale development of organic shale. In the flat zone of the deep lake region, the continental clastic supply is insufficient, the organic carbon content is high, the organic matter type is good (type 鈪，

本文編號：2096236