發(fā)布時(shí)間：2018-10-21 15:13

【摘要】：巖性油氣藏的儲(chǔ)量接近于構(gòu)造油氣藏的儲(chǔ)量,但是巖性油氣藏儲(chǔ)層環(huán)境復(fù)雜,難于勘探和評(píng)價(jià)。n-Y地層元素測(cè)井是具有應(yīng)用前景的勘探和評(píng)價(jià)巖性油氣藏的測(cè)井技術(shù)。目前,世界上成熟應(yīng)用的n-Y地層元素測(cè)井公司有三家,斯倫貝謝公司、哈里伯頓公司和阿特拉斯公司。其中斯倫貝謝公司在中國(guó)提供大量的測(cè)井服務(wù),n-γ地層元素測(cè)井也是其中的一個(gè)服務(wù)項(xiàng)目。ECS測(cè)井儀是斯倫貝謝公司推出的n-Y地層元素測(cè)井儀,該儀器使用的是241 Am (a, n) 9Be同位素中子源,利用BGO (Bi4Ge3O12)探測(cè)器記錄儲(chǔ)層元素與中子相互作用后放出的γ射線,通過(guò)分析Y能譜得到儲(chǔ)層的礦物組成及含量等重要信息。Al,Ca,Fe, K,S,Si,Ti等元素是地層分析中比較重要的元素,它們的熱中子俘獲截面較大,它們發(fā)出的γ射線絕大多數(shù)都是俘獲反應(yīng)的γ射線。本文主要通過(guò)中子與地層中的原子核發(fā)生俘獲反應(yīng)放出γ射線,通過(guò)求解俘獲γ能譜得到這些元素的質(zhì)量百分含量信息。文中從核物理的基本原理出發(fā),結(jié)合地層元素俘獲γ能譜測(cè)井的理想模型,從理論上推導(dǎo)地層元素俘獲Y能譜測(cè)井的譜處理方法中元素相對(duì)產(chǎn)額、靈敏度因子、地層因子三個(gè)關(guān)鍵參數(shù)的求解方法。提出了一套針對(duì)中子俘獲Y能譜處理的流程和方法,包括譜線的預(yù)處理,并通過(guò)MCNP構(gòu)建地層模型對(duì)處理方法進(jìn)行驗(yàn)證。并將這種譜處理方法應(yīng)用到實(shí)測(cè)的能譜中,求得四口井的地層元素質(zhì)量百分含量,對(duì)這種解譜方法的適用性做了評(píng)價(jià)。最后,用給出的解譜步驟和基礎(chǔ)資料求解了MCNP模擬地層元素俘獲γ能譜,給出了元素質(zhì)量百分?jǐn)?shù)的信息,對(duì)解譜結(jié)果和配井結(jié)果進(jìn)行對(duì)比,驗(yàn)證了解譜方法的可行性。求解了四口井的實(shí)測(cè)的混合能譜,給出了三個(gè)參數(shù)的數(shù)據(jù),最終給出了地層元素質(zhì)量百分含量隨深度變化的數(shù)據(jù)。在僅有相對(duì)產(chǎn)額數(shù)據(jù)的情況下,比較了求解的相對(duì)產(chǎn)額和ECS相對(duì)產(chǎn)額的數(shù)據(jù),變化趨勢(shì)基本一致,數(shù)值上仍有差異,并對(duì)產(chǎn)生差異的原因做出了分析。
[Abstract]:The reserves of lithologic reservoirs are close to those of structural reservoirs, but the reservoir environment of lithologic reservoirs is complex and difficult to explore and evaluate. N-Y formation element logging is a promising logging technique for exploration and evaluation of lithologic reservoirs. At present, there are three mature n-Y formation element logging companies in the world, Schlumberger, Halliburton and Atlas. Among them, Schlumberger Company provides a large number of logging services in China, and N- 緯 formation element logging is also one of the service items. ECS logging tool is a n-Y formation element logging tool developed by Schlumberger Company. The instrument uses a 241 Am (a, n) 9Be isotope neutron source and uses a BGO (Bi4Ge3O12) detector to record gamma rays emitted by the interaction of reservoir elements with neutrons. The important information such as mineral composition and content of reservoir are obtained by analyzing Y energy spectrum. The elements such as Al,Ca,Fe, Ki Si Ti are important elements in stratigraphic analysis, and their thermal neutron capture cross sections are large. Most of the 緯-rays emitted by them are capture-reactive 緯-rays. In this paper, 緯 -rays are emitted by neutron trapping reaction with nuclei in the formation, and the mass percent content information of these elements is obtained by solving the captured 緯 -ray spectra. Based on the basic principles of nuclear physics and the ideal model of formation element capture gamma spectrum logging, this paper theoretically deduces the relative yield and sensitivity factor of elements in the spectral processing method of formation element capture Y spectrum logging. The solution method of three key parameters of formation factor. A set of processes and methods for processing neutron capture Y spectra, including the pretreatment of spectral lines, are proposed, and the processing method is verified by constructing a stratigraphic model by MCNP. The spectral processing method is applied to the measured energy spectrum and the mass percent content of formation elements in four wells is obtained. The applicability of this method is evaluated. Finally, the MCNP simulated formation element capture gamma-ray spectrum is solved by using the given solution steps and basic data, and the information of element mass percentage is given. The results of spectral solution and well matching are compared to verify the feasibility of the spectral method. The measured mixed energy spectra of four wells are solved, and the data of three parameters are given. Finally, the data of the variation of mass percent content of formation elements with depth are given. In the case of only relative yield data, the data of relative yield and ECS relative yield are compared, the variation trend is basically the same, and the numerical value is still different, and the reasons for the difference are analyzed.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13;P631.817

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 陳國(guó)能;元素地球化學(xué)場(chǎng)及其地學(xué)意義[J];地球化學(xué);1998年06期

2 沈華韻;王侃;宮兆虎;;蒙特卡羅方法在中子時(shí)空動(dòng)力學(xué)問(wèn)題中的應(yīng)用[J];核動(dòng)力工程;2008年04期

3 袁祖貴,成曉寧,孫娟;地層元素測(cè)井(ECS)——一種全面評(píng)價(jià)儲(chǔ)層的測(cè)井新技術(shù)[J];原子能科學(xué)技術(shù);2004年S1期

相關(guān)碩士學(xué)位論文 前1條

1 趙國(guó)志;蒙特卡羅方法在核測(cè)井中的研究與應(yīng)用[D];黑龍江大學(xué);2010年

，

本文編號(hào)：2285493