【摘要】：大民屯凹陷是遼河盆地的重要油氣富集區(qū)帶之一。勘探實踐表明,大民屯凹陷西部油氣富集規(guī)律與古近系地層展布特征聯(lián)系緊密。因此,為了進一步揭示大民屯凹陷西部油氣分布規(guī)律,提高大民屯凹陷油氣勘探成功率,本文從實際地質(zhì)資料出發(fā),對大民屯凹陷西部古近系地層進行了詳細的劃分,并以單井測井資料為基礎(chǔ)建立連井地層剖面進行地層對比,揭示了大民屯凹陷西部古近系地層的分布規(guī)律;在此基礎(chǔ)上,采用油源對比、沉積相分析及聲波測井等技術(shù)方法分別對大民屯凹陷油氣成藏條件展開研究,并討論了大明屯古近系地層劃分與油氣生成運移和聚集的關(guān)系。大民屯凹陷古近系地層可以分為房身泡組、沙河街組和東營組三個組,屬陸相河湖沉積環(huán)境,其中沙河街組沙四段、沙三段是該凹陷中重要含油氣層段。進一步研究表明,大民屯凹西部古近系可劃分為兩個層序,層序Ⅰ包括沙四段和沙三段,層序Ⅱ包括沙一段和東營組。具體而言,沙四段和沙三段主要以湖侵體系域和高位體系域沉積為主。Es34亞段主要為一套砂泥頻繁互層沉積,砂巖橫向廣泛分布。Es33亞段、Es32亞段、Es31亞段均發(fā)育砂礫巖、細砂巖與泥巖的不等厚互層沉積。但受沉積環(huán)境的控制,南北地區(qū)砂巖與泥巖含量差異較大,北部地區(qū)砂巖含量高,而南部地區(qū)主要為厚層的泥質(zhì)沉積,砂巖發(fā)育程度較低。對比體系域與油氣藏的烴源巖、儲層和蓋層的分布可知,烴源巖主要為湖侵體系域沉積;儲集層砂體主要沉積于高位體系域下部的,主要為沖積扇—扇三角洲—濱淺湖沉積和曲流河—三角洲—濱淺湖沉積。湖侵體系域發(fā)育的烴源巖構(gòu)成了古生界潛山油氣藏的區(qū)域蓋層,此外上部高位體系域的底部也形成了另一套區(qū)域性蓋層。高蠟油系統(tǒng)對應(yīng)的烴源巖體系中砂體含量低,而且上覆Es41厚層泥巖,從而導(dǎo)致其最主要的油氣輸導(dǎo)方式有兩種:(1)源巖→潛山;(2)源巖→斷層→Es3砂層。正常油系統(tǒng)對應(yīng)的烴源巖體系中砂泥巖互層的特征明顯,烴源巖生成的油氣可以直接進入砂層或者通過斷層、裂隙進行短距離運移進入砂層,然后繼續(xù)運移聚集成藏。
[Abstract]:Damingtun depression is one of the important oil and gas accumulation zones in Liaohe Basin. The exploration practice shows that the oil and gas enrichment in the western part of Damingtun depression is closely related to the distribution characteristics of Paleogene strata. Therefore, in order to further reveal the distribution of oil and gas in the western part of Damingtun Sag and improve the success rate of oil and gas exploration in Damingtun Sag, the Paleogene strata in the western part of Damingtun Sag are classified in detail based on the actual geological data. On the basis of single well logging data, the formation profile of multiple wells is established for stratigraphic correlation, which reveals the distribution law of Paleogene strata in the western part of Damingtun Sag, on the basis of which oil source correlation is used. Sedimentary facies analysis and acoustic logging are used to study the oil and gas accumulation conditions in Damingtun sag, and the relationship between the division of Paleogene strata and the generation, migration and accumulation of oil and gas is discussed. The Paleogene strata in Damingtun depression can be divided into three groups: Fangshengpao formation, Shahejie formation and Dongying formation, belonging to the continental fluvial and lacustrine sedimentary environment, among which the Shahejie formation is the fourth member of the Shahejie formation, and the third member of the Shahejie formation is an important oil-bearing gas reservoir in the sag. Further study shows that the Paleogene in the western part of Damingtun depression can be divided into two sequences: sequence I includes the fourth and third member of Sha, and sequence II includes the first member of Sha 1 and the formation of Dongying. In particular, the lacustrine transgressive system tracts and highstand system tracts are the main depositions of the fourth and third member of Sha, which are mainly composed of a set of sand and mud frequent interbedded deposits, and the sandstones are developed in the sandstones in the transverse distribution of the sandstones in the es 32 submember of the es 32 submember, which is widely distributed in the sandstones. Interbedded deposits of fine sandstone and mudstone with unequal thickness. However, controlled by sedimentary environment, the content of sandstone and mudstone varies greatly in the north and south, and the sandstone content is high in the north, while in the south, it is mainly a thick layer of argillaceous deposit, and the development degree of the sandstone is relatively low. The distribution of source rocks, reservoirs and caprocks in system tracts and reservoirs shows that the source rocks are mainly lacustrine transgressive system tracts, and the reservoir sandbodies are mainly deposited in the lower part of high system tracts. It is mainly alluvial fan-fan delta-shore shallow lake deposit and meandering river-delta-shore shallow lake deposit. The source rocks developed in the lacustrine transgressive system tracts constitute the regional caprocks of the Paleozoic buried hill reservoirs, in addition, another set of regional caprocks are formed at the bottom of the upper system tract. The sandbody content in the source rock system corresponding to the high-waxy oil system is low, and the Es41 thick mudstone is overlying, which leads to two main modes of oil and gas transportation: (1) source rock and buried hill; (2) source rock / fault / Es3 sand layer. The characteristics of sandstone and mudstone interbedded in the corresponding source rock system of normal oil system are obvious. The oil and gas generated by source rock can enter directly into sand layer or through fault, and fissures can migrate into sand layer for short distance, and then continue to migrate and accumulate to form reservoir.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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