本文關鍵詞： 勝利油田 永8斷塊 辮狀河三角洲前緣 儲層構型 流體滲流　出處：《中國石油大學(華東)》2015年碩士論文　論文類型：學位論文

【摘要】：陸相斷陷盆地的三角洲砂體是最主要的油氣儲集體,其中辮狀河三角洲占有很大的比例。目前國內(nèi)對該類儲層的油氣開發(fā)很多已經(jīng)進入高含水期,儲層構型研究是精細刻畫儲層內(nèi)部滲流通道和隔夾層的分布的有效方法。目前國內(nèi)外對辮狀河三角洲構型的研究并不多,本文以勝利油田永8斷塊沙二下亞段辮狀河三角洲前緣厚層砂體為研究對象,充分利用巖心、測井、地震和開發(fā)資料,參考Miall河流相構型界面分級方案,在高分辨率層序地層學理論指導下,在沉積旋回控制下,對應開發(fā)層系,在標志層控制下識別6級構型界面,在6級構型界面約束下,采用相控旋回、砂體平對、部分砂體斜對的方法,進行5級、4級構型界面劃分,將主力層段沙二下亞段劃分為6級界面限制的多期三角洲前緣疊置體、5級界面限制的三角洲前緣復合沉積體和4級界面限制的單一三角洲前緣沉積體,并對每一級構型單元及構型界面分別成等厚圖,分析砂巖、泥巖分布規(guī)律。通過巖心精細觀察與描述,在單一三角洲前緣沉積體中識別出水下分流河道、河道周緣溢岸砂體、河口壩主體、河口壩周緣、分流間灣等構型單元,并與測井曲線對應,總結各類型構型單元測井響應特征,指導各種辮狀河三角洲前緣構型單元的測井識別。通過Google Earth圖像,測量并計算辮狀河三角洲分流河道河道長度、河谷長度、河道寬度、河道彎曲度等參數(shù),得到辮狀河三角洲分流河道均比較順直,且河道寬度往往較小,一般不大于300m的結論,而前人研究成果表明,辮狀河三角洲河口壩規(guī)模往往較大,長寬均可達數(shù)千米。在上述辮狀河三角洲地質知識庫的指導下,綜合利用曲線形態(tài)差異、砂體橫向厚度變化、砂體間泥質沉積、隔夾層數(shù)目差異等進行砂體邊界與疊置關系劃分,確定了辮狀河三角洲前緣單一沉積體的平面和剖面的構型樣式。依據(jù)上述方法,對永8斷塊沙二下亞段30套單砂體進行構型單元劃分,揭示了單一沉積體各構型單元逐層進積的基本過程,明確了該區(qū)辮狀河三角洲具有河窄壩寬、河薄壩厚、河順壩橫的特點。統(tǒng)計研究區(qū)30套單砂體內(nèi)各構型單元的規(guī)模,主要為分流河道和河口壩的寬度、厚度、寬厚比等,統(tǒng)計結果表明,研究區(qū)沙二段辮狀河三角洲前緣主要構型單元分流河道、河口壩在寬度、厚度之間的相關性不甚明顯,但分流河道與其對應的河口壩在規(guī)模上相關性較好,河口壩厚度與分流河道厚度之比在1.25~2.5間,主要分布于1.25~2之間,約占80%,河口壩寬度與河道寬度的比值范圍在2.23~8.95之間,變化范圍大,在3~6之間的約占75%,這與淺水辮狀河三角洲的沉積環(huán)境有關。綜合分析構型單元分布、儲層非均質性、優(yōu)勢滲流通道、隔夾層等因素對流體滲流及剩余油分布的影響,并針對不同儲層類型提出提高采收率的開發(fā)方案。
[Abstract]:The delta sand body in continental faulted basin is the most important oil and gas reservoir, among which braided river delta accounts for a large proportion. At present, many oil and gas development of this kind of reservoirs in China has entered a high water-cut period. The study of reservoir configuration is an effective method to describe the distribution of percolation channel and intercalation in the reservoir. At present, there are few researches on braided river delta configuration at home and abroad. This paper takes the braided river delta front thick sand body in Sha2 submember of Yong8 fault block in Shengli Oilfield as the research object, and makes full use of core, logging, seismic and development data. Referring to the classification scheme of Miall river facies and configuration interface, under the guidance of high-resolution sequence stratigraphy theory, under the control of sedimentary cycle, corresponding to the development layer system, the 6-level tectonic interface is identified under the control of the marker layer. Under the constraint of 6 order configuration interface, the interface of 5 grade and 4 grade configuration is divided by the method of phase controlled cycle, sand body flat pair and partial sand body skew pair. The lower sub-member of the main formation is divided into six order interfacial limited multi-stage delta front superimposed delta front composite sedimentary body and a single delta front sedimentary body with 4 level interface limitation. The distribution law of sandstone and mudstone is analyzed and the underwater distributary channel is identified in single delta front sedimentary body by careful observation and description of core. This paper summarizes the logging response characteristics of various types of configuration units, such as sandbody, main body of estuarine dam, periphery of estuarine dam, intertidal bay of distributary and so on, corresponding to well logging curve. Through Google Earth image, the length of distributary channel, length of river valley and width of channel in braided river delta are measured and calculated. The results show that the braided delta distributary channel is straight, and the channel width is usually smaller, generally less than 300m, and the previous research results show that the channel curvature is not more than 300m. The size of the braided river delta estuarine dam is usually large and the length and width can reach several kilometers. Under the guidance of the geological knowledge base of the braided river delta, the variation of transverse thickness of sand body can be comprehensively utilized. The relationship between the boundary of sand body and the superposition is divided, and the plane and profile of the single sedimentary body in the front edge of braided river delta are determined. According to the above method, the structure of the single sedimentary body in the front edge of braided river delta is determined. The structural units of 30 sets of single sand bodies in the lower sub-member of Shaer 2 of Yong8 fault block are divided, the basic process of stratified precession of each tectonic unit of the single sedimentary body is revealed, and it is clear that the braided river delta in this area has narrow river dam width. The size of each configuration unit in 30 sets of single sand body in the statistical study area is mainly the width, thickness, width ratio of distributary channel and estuarine dam, etc. The statistical results show that. In the study area, the correlation between width and thickness of estuarine dam is not obvious, but the correlation between distributary channel and its corresponding estuary dam is good in scale. The ratio of the thickness of the estuarine dam to the thickness of the distributary channel is between 1. 25 and 2. 5, mainly distributed between 1. 25 and 2, accounting for about 80%. The ratio of the width of the estuarine dam to the width of the channel is between 2.23 and 8.95, and the range of variation is large, accounting for about 75% in the range of 3 ~ (6). This is related to the sedimentary environment of the shallow water braided river delta. The effects of such factors as the distribution of tectonic units, reservoir heterogeneity, dominant percolation channels and intercalation on the fluid seepage and remaining oil distribution are comprehensively analyzed. According to different reservoir types, the development plan of improving oil recovery is put forward.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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