發(fā)布時間：2018-04-14 07:01

  本文選題：曲線重構 + 地震解釋　； 參考：《長江大學》2015年碩士論文

【摘要】：薄儲層的預測工作一直都是研究的難點,也相應的發(fā)展出了多種儲層預測的方法和技術。在眾多的儲層預測方法中,只有找到適合于本工區(qū)薄儲層預測的方法和關鍵技術,才能有效地進行儲層預測,進而解決巖性油氣藏的評價問題。本次使用的關鍵技術主要有曲線重構技術和地震反演技術。伊拉克H油田目的層內的儲層具有厚度較薄,多層系砂體發(fā)育和橫向變化快的特點,造成了儲層的識別和精細預測難度較大。在構造高部位失利的well-7使人們開始意識到本工區(qū)的地下地質情況比原先設想的要復雜的多,研究工區(qū)亟需借助地球物理手段來對地下的儲層進行合理地預測和評價。本論文利用伊拉克H油田高分辨率地震資料,綜合應用鉆井、地震、測井、化驗分析等資料對工區(qū)進行了層位解釋與精細構造成圖、儲層預測、各小層砂體厚度及平面沉積相的研究,最終對有利目標進行了勘探部署。采用了如下技術手段進行研究。首先,對工區(qū)內采集的測井曲線進行標準化處理,消除采集時間和儀器單位不同所帶來的誤差,對聲波曲線進行曲線重構,提高了聲波對巖性的識別能力。其次,由己知的井位數(shù)據(jù)、地層模型作為約束條件,用稀疏脈沖反演方法生成波阻抗資料,構建了工區(qū)合理的阻抗分布趨勢。針對常規(guī)反演分辨率不能識別砂泥巖薄互層的難題,應用隨機模擬、隨機反演技術,充分利用測井信息,突破地震頻帶帶寬的限制,達到識別砂泥巖薄互層的目的。在地質統(tǒng)計學反演結果的基礎上,建立起了各小層砂體厚度圖和平面沉積相圖,使我們對地下儲層的分布情況有了一個更加直觀的認識,也為最終的井位部署工作奠定了堅實的基礎。分析認為H油田是一個在長軸背斜構造背景下形成的構造加巖性復合型油藏,儲層主要以潮坪環(huán)境中的灘-壩為主,巖性為中-細粒砂巖。從砂體的分布情況來看,有利儲集砂體主要分布在構造西北部和西南斜坡部位,NA層油藏具有“一砂一藏”的特征,構造高部位和西南斜坡部位的油氣富集程度較高,是進行井位部署的有利位置。在構造解釋成果的基礎上,結合曲線重構技術和地震反演分析方法,預測儲集砂體平面分布規(guī)律,進而開展沉積相的分析工作,尋找有利儲集相帶,最終分析本工區(qū)油氣藏的分布規(guī)律,這不失為一種對薄儲層的識別與評價比較合適的方法,其成果成為為鉆探提供優(yōu)選目標的有利依據(jù)。
[Abstract]:The prediction of thin reservoir is always a difficult point, and many reservoir prediction methods and techniques have been developed accordingly.Among the many reservoir prediction methods, only by finding the method and key technology suitable for the thin reservoir prediction in this area, can the reservoir prediction be carried out effectively and the evaluation problem of lithologic reservoirs be solved.The key techniques used in this paper are curve reconstruction and seismic inversion.The reservoir in the target layer of H oilfield in Iraq has the characteristics of thin thickness, rapid development of multi-layer sand body and rapid lateral change, which makes it difficult to identify and predict the reservoir.Because of the failure of well-7 in the high structural area, people begin to realize that the underground geological conditions in this area are much more complicated than originally thought. The research area needs to use geophysical means to reasonably predict and evaluate the underground reservoir.In this paper, using high-resolution seismic data of H oil field in Iraq, comprehensive application of drilling, seismic, logging, chemical analysis and other data to the work area for layer interpretation and fine structure mapping, reservoir prediction,The thickness and plane sedimentary facies of each small sand body are studied, and the favorable targets are finally explored and deployed.The following technical means are used to carry out the research.Firstly, the logging curves collected in the working area are standardized to eliminate the errors caused by different acquisition time and instrument units, and the acoustic curves are reconstructed to improve the recognition ability of acoustic waves to lithology.Secondly, based on known well location data and formation model as a constraint condition, the sparse pulse inversion method is used to generate wave impedance data, and a reasonable impedance distribution trend in the working area is constructed.In view of the difficult problem that the conventional inversion resolution can not identify the thin interbed of sand and mudstone, stochastic simulation and stochastic inversion technology are used to make full use of logging information to break through the limitation of seismic band bandwidth and to achieve the purpose of identifying thin interbed of sand and mudstone.On the basis of the result of geostatistics inversion, the thickness map and plane sedimentary facies diagram of each sub-layer sand body are established, which makes us have a more intuitive understanding of the distribution of underground reservoir.It also lays a solid foundation for the final well location deployment.It is considered that H oil field is a structural and lithologic complex reservoir formed in the background of long axis anticline. The reservoir mainly consists of beach and dam in tidal flat environment, and the lithology is medium to fine grain sandstone.According to the distribution of sand bodies, the favorable reservoir sand bodies are mainly distributed in the northwestern structure and southwest slope of the reservoir with the characteristics of "one sand and one reservoir", and the oil and gas enrichment degree of the high structural area and the southwest slope is relatively high.Is an advantageous location for well location deployment.On the basis of structural interpretation results, combined with curve reconstruction technique and seismic inversion analysis method, the plane distribution law of reservoir sand body is predicted, and the analysis of sedimentary facies is carried out to find favorable reservoir facies zone.Finally, the distribution of oil and gas reservoirs in this area is analyzed, which is a suitable method for the identification and evaluation of thin reservoirs.
【學位授予單位】：長江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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