本文關(guān)鍵詞： 渝東北 龍馬溪組 頁巖氣 儲(chǔ)層特征　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：綜合露頭、巖心的宏觀描述,薄片鑒定、掃描電鏡的微觀觀察,以及物性、有機(jī)地球化學(xué)與含氣性等實(shí)驗(yàn)分析,對(duì)渝東北A地區(qū)龍馬溪組頁巖儲(chǔ)層特征進(jìn)行了研究。為了對(duì)頁巖儲(chǔ)層進(jìn)行精細(xì)研究,將龍馬溪組分為龍一段與龍二段,并且將龍一段分為了龍一1與龍一 2兩個(gè)亞段,進(jìn)一步將龍一1亞段分為了 a、b、c、d四個(gè)小層,本論文主要對(duì)龍馬溪組底部龍一段富有機(jī)質(zhì)頁巖進(jìn)行研究。研究區(qū)頁巖TOC介于0.15%～11%之間,平均可達(dá)3%,TOC含量呈正態(tài)分布,在2%～6%之間分布最大,縱向上龍一 1亞段a小層TOC向上呈減少的趨勢(shì),在平面上TOC由西北向東南呈逐漸降低的趨勢(shì)。通過鄰區(qū)干酪根類型推斷研究區(qū)主要為Ⅰ型干酪根,少數(shù)為Ⅱ1型干酪根,具有較好的生烴能力。鏡質(zhì)體反射率以及巖石熱解分析都表明研究區(qū)大部分區(qū)域有機(jī)質(zhì)處于過成熟階段,平面上從北到南Ro呈增加的趨勢(shì)。研究區(qū)主要發(fā)育4種巖性,分別為頁巖、含粉砂頁巖、粉砂質(zhì)頁巖與凝灰質(zhì)頁巖。頁巖主要分布在龍一 1亞段a小層與c小層,含粉砂頁巖主要分布在龍一1亞段a、b、c小層,粉砂質(zhì)頁巖與凝灰質(zhì)頁巖主要分布在龍一1亞段d小層與龍二段,從龍一1亞段a小層向上頁巖顏色逐漸變淺,粉砂含量逐漸增多,頁巖品質(zhì)變差。巖石礦物成分以石英和粘土為主,且在縱向上龍一1亞段a小層向上石英含量逐漸減少,而粘土含量逐漸增多,碳酸鹽礦物較少,普遍含有黃鐵礦,粘土礦物主要為伊利石、綠泥石與伊/蒙混層。對(duì)頁巖脆性指數(shù)研究表明,縱向上脆性指數(shù)總體較高且龍一1亞段a小層向上脆性指數(shù)呈降低的趨勢(shì)。研究區(qū)孔隙度整體較低,介于0.53%～7.46%之間,整個(gè)龍一1亞段平均孔隙度僅為1.69%。縱向上龍一1亞段a小層向上孔隙度呈逐漸減小的趨勢(shì),頁巖滲透率測(cè)試值普遍較低,最小值為0.0000098mD,最大值為5.144mD,且測(cè)試出的滲透率高值一般是由于裂縫發(fā)育造成的。研究區(qū)頁巖儲(chǔ)滲空間由裂縫、礦物基質(zhì)孔隙與有機(jī)質(zhì)孔組成,識(shí)別出構(gòu)造縫、層間頁理縫、層面滑移縫、成巖收縮微裂縫4種裂縫類型,并對(duì)礦物基質(zhì)孔隙與有機(jī)質(zhì)孔隙在掃描電鏡下的形態(tài)特征進(jìn)行了觀察與描述。研究區(qū)頁巖樣品含氣量介于0.17m3/t～5.66m3/t之間,縱向上從龍一1亞段a小層向上呈減小的趨勢(shì),且龍一1亞段整體含氣量較高,各個(gè)小層平均值均大于3m3/t,而到了龍一 2亞段含氣量顯著降低,平均僅為0.58m3/t,分析認(rèn)為含氣量主要受TOC與孔隙度影響,而受礦物組成的影響有限。以TOC、孔隙度、含氣量與脆性指數(shù)為儲(chǔ)層分類評(píng)價(jià)參數(shù),對(duì)X2井進(jìn)行了儲(chǔ)層評(píng)價(jià),結(jié)果表明該井主要為Ⅲ類儲(chǔ)層,Ⅰ類儲(chǔ)層與Ⅱ類儲(chǔ)層分布較少且厚度較薄,總的來說X2井儲(chǔ)層品質(zhì)較差。
[Abstract]:Comprehensive outcrop, core macroscopical description, thin slice identification, scanning electron microscopic observation, and physical properties, organic geochemistry and gas-bearing experimental analysis. The shale reservoir characteristics of Longmaxi formation in A area of northeast Chongqing were studied. In order to study the shale reservoir in detail, Longmaxi formation was divided into long 1 member and long 2 member. The first segment was divided into two subsections, Long-1 and Long-2, and further divided into four layers. In this paper, the organic shale of Longyi member at the bottom of Longmaxi formation is studied. The TOC of shale in the study area is between 0.15% and 11%, and the average content of TOC is normal distribution. The distribution was the largest between 2% and 6%, and the TOC of submember a of Long-1 submember showed a decreasing trend in the longitudinal direction. The TOC decreased gradually from northwest to southeast on the plane. The main type of kerogen was type I kerogen and a few type 鈪，

本文編號(hào)：1452727