本文選題：沉積相　切入點：體系域　出處：《東北石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：廟西凹陷位于渤中坳陷東南部,渤中坳陷是渤海灣盆地最大的一個坳陷,根據(jù)目前的研究情況,這里是渤海灣盆地的主力生油坳陷之一,曾經(jīng)發(fā)現(xiàn)了好幾個特大油氣田,如PL19-3油氣田和PL25-6油氣田。而目前,廟西凹陷的勘探程度還很低,研究程度還不夠,所以為了正確認識廟西凹陷古近系的沉積相類型及其時空分布演化規(guī)律,更好的指導古近系隱蔽圈閉油氣藏的勘探開發(fā),本文運用層序地層學和沉積學原理等相關知識,通過詳盡的巖心觀察、測井和古生物資料分析,對廟西凹陷的沉積相進行再認識。依據(jù)沉積特征,將古近系劃分為4個二級層序,7個三級層序。二級層序依次為孔店組、沙四段、沙三段、沙二-東營組,其中沙二-東營組劃分為東二、東三、沙一段和沙二段。受物源供應、物源方向和湖平面變化的控制,古近系發(fā)育湖泊、扇三角洲和辮狀河三角洲三種沉積相,可劃分為5個沉積亞相,分別是辮狀河三角洲平原、前緣、扇三角洲平原、濱淺湖和深湖-半深湖亞相。在沉積相縱向演化和體系域橫向?qū)Ρ妊芯康幕A上,認為廟西凹陷的主要物源來自古廟西河和古旅順河,從沙河街組至東營組時期,整體表現(xiàn)為湖區(qū)范圍擴張、湖平面上升的趨勢,在東營組二段時期,湖平面達到一個最高值。
[Abstract]:The Miaoxi Depression is located in the southeast of the Bozhong Depression, which is the largest depression in the Bohai Bay Basin. According to current research, this is one of the main oil-producing depression in the Bohai Bay Basin, and several large oil and gas fields have been discovered. For example, PL19-3 oil and gas field and PL25-6 oil and gas field. At present, the exploration degree of Miaoxi sag is still very low and the research degree is not enough. Therefore, in order to correctly understand the sedimentary facies type of Paleogene and its temporal and spatial distribution and evolution law in Miaoxi sag, To better guide the exploration and development of Paleogene subtle traps, this paper applies sequence stratigraphy, sedimentology and other relevant knowledge, through detailed core observation, logging and paleontological data analysis, According to the sedimentary characteristics, Paleogene is divided into four secondary sequences and seven third-order sequences. The second order sequences are Kongdian formation, Sha 4 member, Sha 3 member and Sha Er-Dongying formation. There are three sedimentary facies in the Paleogene, namely, lake, fan delta and braided river delta, which are controlled by the source supply, the direction of the source and the change of lake level. It can be divided into five sedimentary subfacies, namely braided river delta plain, front edge, fan delta plain, shore-shallow lake and deep lacustry-semi-deep lacustrine subfacies. It is considered that the main provenance of the Miaoxi sag comes from the ancient Miao Xihe River and the Gulieshun River. From Shahejie formation to Dongying formation, the whole area of the lake area expands and the lake level rises. In the second stage of the Dongying formation, the lake level reaches a maximum value.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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