本文關(guān)鍵詞： 大磨拐河組 沉積相 油氣富集 油氣控制作用 貝爾凹陷　出處：《東北石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以海拉爾盆地貝爾湖坳陷貝爾凹陷大磨拐河組為研究對象,在仔細(xì)研讀相關(guān)文獻(xiàn),并參考已有研究成果的基礎(chǔ)上,利用地球物理學(xué)、儲層地質(zhì)學(xué)、石油地質(zhì)學(xué)、沉積巖石學(xué)等相關(guān)學(xué)科知識理論,通過對所取得的分析化驗資料、相關(guān)巖心樣品觀察描述記錄和測井資料等的綜合分析利用,對研究區(qū)地層及目的層段的沉積相類型、砂體展布特征、油氣成藏要素、主控因素進行了分析研究,最后在上述工作的基礎(chǔ)上綜合考慮各種因素分析了沉積相對油氣的控制作用。貝爾凹陷大一段沉積期湖泊分布范圍廣闊,以湖相沉積為主,三角洲沉積范圍較小;至大二段沉積期湖泊面積縮小,三角洲沉積發(fā)育規(guī)模變大。通過綜合考慮沉積巖顏色、沉積構(gòu)造、及測井相標(biāo)志等沉積相標(biāo)志,結(jié)合單井相及聯(lián)井相分析認(rèn)為研究區(qū)主要發(fā)育三角洲相和湖相兩種相類型,曲流河三角洲前緣、前曲流河三角洲、曲流河三角洲平原、濱淺湖、半深湖—深湖五個亞相,河口壩、遠(yuǎn)砂壩、席狀砂、水下分流河道、分流河道、分流間灣、水下分流間灣、重力流、深湖泥、前三角洲泥十個微相。在對沉積微相進行分析的基礎(chǔ)上,參考前人研究成果,結(jié)合從現(xiàn)場取得的大量數(shù)據(jù)對該區(qū)油氣成藏要素及主控因素進行了分析,對油氣來源、運移通道、成藏模式等進行了研究。分析認(rèn)為大磨拐河組油氣主要來源于南屯組和大一段地層、儲層主要為大二段砂礫巖、伊敏組一段為蓋層;油氣運移通道主要為不整合面及斷裂,生儲蓋組合為下生上儲式;有效烴源巖的分布區(qū)控制了油氣的分布,油氣通過短距離運移在生烴中心附近聚集,而沉積微相通過控制著有利儲層的展布對油氣的聚集產(chǎn)生影響。不同沉積微相發(fā)育不同的沉積物,湖相下發(fā)育暗色泥巖因富含有機質(zhì)在合適的環(huán)境下會成為烴源巖層,其孔滲性極低的特性也為其成為有效的蓋層提供了可能;三角洲相發(fā)育的砂體因其較好的孔滲性而成為油氣儲集的有利場所,沉積相通過影響烴源巖層和儲層的分布控制油氣的富集,研究區(qū)目的層段油氣主要分布在水下分流河道砂體中。
[Abstract]:This paper takes the Damoguahe formation of Beihu depression in Hailaer Basin as the research object. On the basis of carefully studying the relevant documents and referring to the existing research results, geophysics and reservoir geology are used in this paper. Petroleum geology, sedimentary petrology and other related disciplines knowledge theory, through the analysis of the obtained laboratory data, related core sample observation and description records and logging data comprehensive analysis and utilization. The types of sedimentary facies, the distribution characteristics of sand bodies, the oil and gas accumulation elements and the main controlling factors in the stratigraphic and target strata in the study area are analyzed and studied. Finally, on the basis of the above work, the controlling effect of sedimentary relative oil and gas is analyzed synthetically considering various factors. The lake distribution of the large first member of Beier sag is wide, with lacustrine sedimentary as the main factor. The delta sedimentary range is small; The lacustrine area shrinks and the delta depositional scale becomes larger during the depositional period of the second stage. The sedimentary facies marks, such as the color of sedimentary rocks, sedimentary structures, and logging facies markers, are considered synthetically. Combined with single well facies and combined well facies analysis, it is concluded that there are two types of facies in the study area: delta facies and lacustrine facies, meandering river delta front, pre-meandering river delta, meandering river delta plain and shallow shore lake. Half-deep lacustry-deep lake five subfacies, estuarine dam, far sand dam, sheet sand, underwater distributary channel, distributary channel, distributary bay, underwater distributary bay, gravity flow, deep lake mud. Ten microfacies of pre-delta mud. Based on the analysis of sedimentary microfacies and referring to the previous research results, combined with a large number of data obtained from the field, the oil and gas reservoir forming elements and main controlling factors in this area are analyzed. The oil and gas source, migration channel and reservoir forming model are studied. It is considered that the oil and gas of the Damoguahe formation are mainly from Nantun formation and the first member of the first member of the formation, the reservoir is mainly sandstone of the second member, and the first member of the Yimin formation is the caprock. The hydrocarbon migration channel is mainly unconformity surface and fault, and the assemblage of source, reservoir and caprock is lower generation and upper reservoir type. The distribution area of effective source rocks controls the distribution of oil and gas, which accumulates near the center of hydrocarbon generation through short distance migration. Sedimentary microfacies affect hydrocarbon accumulation by controlling the distribution of favorable reservoirs. Different sedimentary microfacies develop different sediments. The dark mudstone developed under the lake facies will become the source rock of hydrocarbon in the suitable environment because of its rich organic matter, and the extremely low porosity and permeability also provide the possibility for it to become an effective caprock. The sand body developed by delta facies is a favorable place for oil and gas reservoir because of its good porosity and permeability. Sedimentary facies control the accumulation of oil and gas by influencing the distribution of source rock and reservoir. The oil and gas of the target formation in the study area are mainly distributed in the underwater distributary channel sand body.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13
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本文編號：1452649