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傳統(tǒng)油氣地質(zhì)理論的突破與創(chuàng)新及非常規(guī)油氣資源潛力

2016-08-23 12:15:45苗錢友朱筱敏姜振學(xué)李卓陳磊張昆
關(guān)鍵詞:分布模式

苗錢友 朱筱敏 姜振學(xué) 李卓 陳磊 張昆 原園

摘 要:在油氣勘探實(shí)踐中,傳統(tǒng)油氣地質(zhì)理論為石油工業(yè)的發(fā)展做出了重大貢獻(xiàn),但隨著油氣勘探向非常規(guī)油氣資源轉(zhuǎn)變,傳統(tǒng)油氣地質(zhì)理論與認(rèn)識(shí)遇到了諸多問題與挑戰(zhàn),已不能有效指導(dǎo)非常規(guī)油氣勘探。從非常規(guī)油氣成藏條件來看,“源”不只是生成油氣的巖石,而且是勘探的儲(chǔ)集層和目的層;致密巖層也可以成為有效儲(chǔ)層;非常規(guī)油氣的封閉機(jī)制與常規(guī)油氣不同;連續(xù)和準(zhǔn)連續(xù)成藏不需傳統(tǒng)圈閉條件;滯留和短距離運(yùn)移均可成藏;保存條件的評(píng)價(jià)方法也與常規(guī)油氣不同。從油氣成藏機(jī)制而言,非浮力也可成藏,且是以大面積、連片富集成藏為主;從賦存狀態(tài)而言,油氣除呈游離態(tài)賦存外,還可以呈吸附態(tài)、溶解態(tài)等方式賦存;從富集分布模式而言,油氣除在圈閉和高點(diǎn)富集成藏外,盆地的洼陷、斜坡均可富集成藏并達(dá)到滿凹含油。世界上非常規(guī)油氣資源是常規(guī)油氣資源的4倍以上,展示出巨大的勘探前景。

關(guān)鍵詞:非常規(guī)油氣;油氣地質(zhì)理論;成藏條件;聚集機(jī)制;賦存狀態(tài);分布模式;油氣資源

中圖分類號(hào):P618.130.2;TE132.2 文獻(xiàn)標(biāo)志碼:A

Abstract: For the practice of petroleum exploration, the traditional petroleum geological theory has made great contributions to the development of petroleum industry. But, with the development of petroleum exploration into unconventional petroleum, the traditional petroleum geological theory and insight have come across with many problems and challenges, which can not direct unconventional hydrocarbon exploration effectively. In the perspective of condition of unconventional hydrocarbon accumulation, “source” is not only the rock generating hydrocarbon, but also reservoir and target; tight rock can be effective reservoir; enclosed mechanism of unconventional hydrocarbon is different from the conventional hydrocarbon; continuous and quasi-continuous hydrocarbon accumulation is not controlled by traditional trap condition; detention and short distance migration can form hydrocarbon reservoir; the evaluation methods of storage conditions are not exactly the same as conventional hydrocarbon. In the perspective of hydrocarbon accumulation mechanism, hydrocarbon reservoir can be formed under the mechanism of non-buoyancy in continuous large area; in the perspective of state hydrocarbon occurrence, besides free state, hydrocarbon can be accumulated in the states of adsorption and dissolution; in the perspective of distribution model of hydrocarbon enrichment, except for trap and high point, hydrocarbon can be accumulated in basin sub-sag and slope, sag-wide oil-bearing. The unconventional hydrocarbon resource around the world is more than 4 times of conventional hydrocarbon resource, indicating tremendous exploration prospect.

Key words: unconventional petroleum; petroleum geological theory; accumulation condition; accumulation mechanism; occurrence state; distribution pattern; hydrocarbon resource

0 引 言

人類認(rèn)識(shí)和利用油氣的歷史由來已久,早在1835年中國(guó)四川盆地就鉆成了世界上第一口超千米的深井,但是國(guó)外石油界都把德雷克(Edwin Laurentin Drake)于1859年8月27日鉆成的一口油井看作世界石油工業(yè)的開端[1-2]。20世紀(jì)以來,石油工業(yè)飛快發(fā)展,1900年起,西方石油公司紛紛成立地質(zhì)研究機(jī)構(gòu),開始用油氣地質(zhì)理論來指導(dǎo)找油。在尋找油氣的過程中,石油地質(zhì)學(xué)家圍繞油氣勘探開發(fā)階段[3-11],在油氣的勘探實(shí)踐中相繼提出了背斜學(xué)說[12]、圈閉理論[2]、干酪根熱降解生烴理論[13]和含油氣系統(tǒng)理論[14]等石油地質(zhì)理論,這些理論與學(xué)說極大地促進(jìn)了石油工業(yè)的發(fā)展。與此同時(shí),中國(guó)石油地質(zhì)學(xué)家根據(jù)中國(guó)特殊的地質(zhì)特征,提出了陸相生油理論[15]、源控論[16]、陸相盆地復(fù)式油氣聚集帶理論[17]、富油氣凹陷滿凹含油理論[18]和巖性地層油氣藏理論[11,19-21]等具有中國(guó)特色的石油地質(zhì)理論,為石油地質(zhì)學(xué)的發(fā)展做出了巨大貢獻(xiàn)。

隨著地質(zhì)理論的發(fā)展和科技進(jìn)步,石油工業(yè)發(fā)展將會(huì)經(jīng)歷常規(guī)油氣、常規(guī)與非常規(guī)油氣、非常規(guī)油氣三大階段[22-25]。21世紀(jì)以來,美國(guó)頁巖氣迅猛發(fā)展,特別是2008年后頁巖油產(chǎn)量也快速上升,引起了全球油氣界的巨大關(guān)注[26-30]。頁巖氣的發(fā)展源于同屬非常規(guī)的致密油氣,人們將開發(fā)中采用的以水平井和壓裂為主體的技術(shù)系列引入到巖性更加致密的暗色頁巖中,逐步完善后就促成了頁巖油氣的巨大發(fā)展,而頁巖油氣的技術(shù)進(jìn)步和對(duì)傳統(tǒng)油氣地質(zhì)理論的重新認(rèn)識(shí)又反過來推動(dòng)著非常規(guī)油氣特別是煤層氣的勘探開發(fā)。與此同時(shí),非常規(guī)油砂、重油的經(jīng)濟(jì)開發(fā)也取得重大進(jìn)展,特別是縱貫加拿大和美國(guó)西部的油砂帶和橫貫委內(nèi)瑞拉的奧利諾科重油帶都形成大—超大型油田群[31]。作為非常規(guī)氣潛力巨大的天然氣水合物也被列入積極探索的目標(biāo)[32]。

就近期的勘探開發(fā)來說,非常規(guī)油氣已達(dá)到與常規(guī)油氣同等重要的地位;而就未來的供應(yīng)來看,前者卻似乎更為重要。頁巖油氣的成功開發(fā)使人們對(duì)非常規(guī)油氣的認(rèn)識(shí)更加深化和系統(tǒng)化,促使其完成了向理性認(rèn)識(shí)的飛躍,促成了傳統(tǒng)油氣地質(zhì)理論的突破和創(chuàng)新。

本文首先從傳統(tǒng)油氣地質(zhì)理論的六大地質(zhì)要素“生、儲(chǔ)、蓋、圈、運(yùn)、保”出發(fā),探討了油氣成藏條件理論觀念如何從常規(guī)向非常規(guī)轉(zhuǎn)變,然后對(duì)比了常規(guī)與非常規(guī)油氣的成藏機(jī)理與模式,最后對(duì)非常規(guī)油氣的資源潛力進(jìn)行了分析,并提出了幾點(diǎn)對(duì)今后油氣勘探的啟示。

1 油氣成藏理論觀念的轉(zhuǎn)變

傳統(tǒng)油氣地質(zhì)理論認(rèn)為油氣藏的形成和分布是烴源巖、儲(chǔ)集層、蓋層、圈閉、運(yùn)移和保存條件綜合作用的結(jié)果,這6個(gè)地質(zhì)要素可以概括為“生、儲(chǔ)、蓋、圈、運(yùn)、保”[2]。常規(guī)“油氣藏”定義是在“單一圈閉中”,“單一”主要是指受單一地質(zhì)要素所控制,在單一的儲(chǔ)集層中具有統(tǒng)一的壓力系統(tǒng)及統(tǒng)一的油、氣、水邊界。油氣在烴源巖中生成后,經(jīng)過運(yùn)移進(jìn)入圈閉形成油氣藏,而且地質(zhì)歷史中形成的油氣藏只有在一定條件下才能保存下來。

根據(jù)傳統(tǒng)油氣地質(zhì)理論,烴源巖內(nèi)無法排出的殘余油氣不能形成有經(jīng)濟(jì)價(jià)值的油氣藏;如果地層致密,不能形成有效儲(chǔ)層,也不適宜作為勘探開發(fā)對(duì)象;如果油氣藏后期被破壞,天然氣首先逸散,石油的輕質(zhì)組分散失而形成流動(dòng)性差的重油(稠油),甚至形成瀝青砂。直到20世紀(jì)七八十年代,這3類油氣在當(dāng)時(shí)的“常規(guī)”技術(shù)下也很難被經(jīng)濟(jì)利用。然而近些年來,以頁巖氣革命為代表的非常規(guī)油氣正在顛覆傳統(tǒng)油氣地質(zhì)理論的認(rèn)識(shí)。非常規(guī)油氣主要是指其形成條件、聚集機(jī)制、油氣賦存狀態(tài)和分布規(guī)律不同于常規(guī)油氣,使用傳統(tǒng)技術(shù)無法獲得自然工業(yè)產(chǎn)量,需用新技術(shù)改善儲(chǔ)集層滲透率或流體黏度等才能經(jīng)濟(jì)開采的連續(xù)或準(zhǔn)連續(xù)型聚集的油氣資源,包括致密油、致密氣、頁巖油、頁巖氣、煤層氣、可燃冰、油砂和油頁巖等[9]。非常規(guī)油氣藏與常規(guī)油氣藏的地質(zhì)特征有諸多不同(表1)。

1.1 油氣成藏條件理論觀念的轉(zhuǎn)變

1.1.1 烴源巖與泥頁巖儲(chǔ)層

在傳統(tǒng)油氣地質(zhì)理論中,泥頁巖只被當(dāng)作烴源巖或蓋層,從泥頁巖中生成的油氣伴隨成巖作用的致密化而與水一起被排出,遇到合適的圈閉條件發(fā)生聚集形成常規(guī)油氣藏。但近些年來,北美的石油企業(yè)將暗色泥頁巖作為儲(chǔ)集層進(jìn)行勘探開發(fā),取得了巨大成功[33-37]。從地質(zhì)角度分析,這是由于泥頁巖生成的油氣一部分運(yùn)移至圈閉聚集形成常規(guī)油氣藏,但大部分沒有排出而是滯留下來形成頁巖油氣藏。從圖1的實(shí)例可以看出,濟(jì)陽坳陷古近系不同層位泥頁巖的生烴量遠(yuǎn)大于排烴量,生成的油氣大部分滯留于源巖中。傳統(tǒng)油氣地質(zhì)理論認(rèn)為,若烴源巖單層厚度過大,不利于地層中部的油氣順利排出,是一種“無效烴源巖”;但頁巖油氣理論認(rèn)為,這卻是難得的有利條件,單層厚度越大,不僅保留的油氣量大,而且越容易進(jìn)行水平井和壓裂施工,往往是首選的勘探對(duì)象[38-41]。中國(guó)近年來也開始進(jìn)行頁巖油氣的勘探開發(fā),并取得一系列重大突破,2012年中國(guó)石化發(fā)現(xiàn)涪陵焦石壩頁巖氣田,產(chǎn)氣層段為上奧陶統(tǒng)—下志留統(tǒng)的五峰組—龍馬溪組,優(yōu)質(zhì)頁巖厚度大,總有機(jī)碳(TOC)高,鏡質(zhì)體反射率(Ro)適中,含氣量與單井產(chǎn)量高。

1.1.2 高孔滲儲(chǔ)集層與低孔滲儲(chǔ)集層

在傳統(tǒng)油氣地質(zhì)理論中,儲(chǔ)集層一般都是保留較多孔隙且連通性較好的地層,油氣勘探首先關(guān)注孔隙度、滲透率等物性條件好且油氣充滿程度高的好儲(chǔ)層。在好儲(chǔ)層油氣勘探開發(fā)程度越來越高的情況下,為了滿足日趨增長(zhǎng)的消費(fèi)需求量,油氣工業(yè)便不斷向孔滲性能較差的儲(chǔ)集層進(jìn)軍,從低孔滲儲(chǔ)集層延伸至致密儲(chǔ)集層[42-45]。常規(guī)油氣的孔喉直徑下限為1 000 nm,以達(dá)西滲流為主;而對(duì)于致密油氣,孔喉直徑下限為50 nm,以擴(kuò)散-滑脫流、低速非達(dá)西流為主;頁巖油氣的孔喉直徑下限可以達(dá)到5 nm,以解析和擴(kuò)散為主[7]。鄂爾多斯盆地中部大面積展布的延長(zhǎng)組長(zhǎng)7段致密砂巖儲(chǔ)集體與油頁巖、暗色泥巖互鄰共生,在異常高壓的持續(xù)作用下,石油就近持續(xù)充注形成大型致密油藏[46-48]。

塔里木盆地庫(kù)車坳陷侏羅系和白堊系致密氣儲(chǔ)層的含氣層孔隙度基本上分布在2%~12%[49],天然氣排入到儲(chǔ)層中不受浮力作用,氣體排驅(qū)儲(chǔ)層空間中的水而富集成藏,孔隙度更高的地層由于氣體受浮力作用向更高部位運(yùn)移反而不含氣,只有運(yùn)移到圈閉中的天然氣才能富集成藏(圖2)。這是由于“連續(xù)型”致密砂巖氣藏的形成是天然氣持續(xù)不斷的供給和散失達(dá)到動(dòng)態(tài)平衡的過程,氣藏邊界本質(zhì)上是由成藏時(shí)期致密儲(chǔ)層臨界孔喉半徑所決定的[50]。當(dāng)儲(chǔ)層孔喉半徑大于臨界孔喉半徑時(shí),氣體散失,不能聚集成藏。

1.1.3 上覆蓋層與儲(chǔ)層自封閉

在傳統(tǒng)油氣地質(zhì)理論中,烴源巖中生成的油氣運(yùn)移到儲(chǔ)集層中,如果上方?jīng)]有蓋層的遮擋,將會(huì)逐漸散失殆盡。而在非常規(guī)油氣地質(zhì)理論中,由于儲(chǔ)集層物性本身比較致密,致密儲(chǔ)集層本身就具有一定的自封閉能力,如厚度較大的頁巖一般是靠近頁巖頂面和底面的、距離滲透性地層較近的部分生成油氣易于排出,而對(duì)于頁巖中部的烴類由于距離滲透性地層較遠(yuǎn)一般殘留較多。常規(guī)油氣理論一般只對(duì)儲(chǔ)層上覆的直接蓋層或區(qū)域性蓋層進(jìn)行研究,而對(duì)于頁巖氣來說,需要研究頁巖層系頂、底板的封閉能力。

烴源巖生成油氣后,其動(dòng)力不能突破頁巖孔喉毛細(xì)管力而殘留于頁巖儲(chǔ)層中,受到源儲(chǔ)壓差動(dòng)力的作用進(jìn)入致密儲(chǔ)層中的油氣也基本不受浮力作用而殘留在致密儲(chǔ)層中。若在上覆地層中存在更致密的蓋層,則對(duì)油氣保存更為有利。例如,塔里木盆地庫(kù)車坳陷迪西1氣藏位于致密儲(chǔ)層構(gòu)造斜坡部位,具有下氣上水的特征,靠?jī)?chǔ)層自身毛細(xì)管力對(duì)天然氣進(jìn)行了封堵(圖3)。

1.1.4 圈閉油氣成藏與連續(xù)或準(zhǔn)連續(xù)油氣聚集

傳統(tǒng)油氣地質(zhì)理論認(rèn)為,油氣都是在圈閉中聚集成藏,受構(gòu)造(構(gòu)造圈閉)、不整合(地層圈閉)、巖性(巖性圈閉)等控制,界線明顯,沒有圈閉則無法形成有效的油氣藏。與常規(guī)油氣藏不同,非常規(guī)油氣無明顯圈閉界線,呈連續(xù)或準(zhǔn)連續(xù)聚集[1]。對(duì)于常規(guī)油氣而言,浮力是最主要的運(yùn)聚動(dòng)力[51],而對(duì)于非常規(guī)油氣,浮力在油氣運(yùn)聚中的作用受到局限,以擴(kuò)散作用等非達(dá)西滲流為主[52-53]。源內(nèi)油氣主要是滯留聚集,源外油氣運(yùn)聚動(dòng)力為源儲(chǔ)壓差,受生烴增壓、欠壓實(shí)和構(gòu)造應(yīng)力等影響,運(yùn)聚阻力為毛細(xì)管力,兩者耦合控制油氣邊界或范圍,多表現(xiàn)為油、氣、水層共存,呈連續(xù)相,分布較復(fù)雜,無明顯油氣水界線,含油氣飽和度差異較大。

對(duì)連續(xù)型頁巖油氣、煤層氣等烴源巖內(nèi)油氣聚集特征的研究表明,這類油氣聚集基本上不受圈閉控制,但構(gòu)造圈閉的存在往往會(huì)對(duì)這類油氣藏的局部富集具有一定乃至重要的控制作用,這時(shí)構(gòu)造圈閉實(shí)際上起了“甜點(diǎn)”的作用。另外,對(duì)有些連續(xù)型油氣聚集(如煤層氣藏)而言,水動(dòng)力條件也會(huì)對(duì)油氣富集產(chǎn)生重要的控制作用,但其可能并不完全充當(dāng)圈閉(即水動(dòng)力圈閉)的作用,而類似于“甜點(diǎn)”性質(zhì)。與連續(xù)型聚集不同,作為準(zhǔn)連續(xù)型聚集的致密油氣受到圈閉的一定控制,只不過控制其油氣聚集的圈閉不是背斜圈閉,而主要是巖性等非背斜圈閉[54]。

1.1.5 油氣長(zhǎng)距離運(yùn)移與原地滯留或短距離運(yùn)移

在傳統(tǒng)油氣地質(zhì)理論中,油氣一般會(huì)經(jīng)過較長(zhǎng)距離的運(yùn)移到達(dá)圈閉中聚集成藏,浮力為油氣運(yùn)移的主要?jiǎng)恿Γ毡榇嬖趦?yōu)勢(shì)油氣運(yùn)移通道。而非常規(guī)油氣運(yùn)移距離一般較短,為原地滯留、初次運(yùn)移或短距離二次運(yùn)移,尤其是煤層氣、頁巖油氣,具有“生-儲(chǔ)-蓋”三位一體的特征,基本上生烴后就地存儲(chǔ),一般不發(fā)生顯著運(yùn)移,也缺乏優(yōu)勢(shì)運(yùn)移通道;致密砂巖油氣為近源成藏,大面積彌漫式充注,初次運(yùn)移直接成藏或短距離二次運(yùn)移成藏,滲濾擴(kuò)散作用是油氣運(yùn)移的主要方式,導(dǎo)致油氣水分異差[7],如四川盆地三疊系須家河組及鄂爾多斯盆地上古生界大面積含氣,呈氣水共存的特征。生產(chǎn)實(shí)踐證實(shí),致密油氣中流體滲流以非達(dá)西滲流為主,存在啟動(dòng)壓力,需附加驅(qū)替力才可使流體開始流動(dòng),形成油氣生產(chǎn)能力。

1.1.6 油氣保存

常規(guī)油氣和非常規(guī)油氣都需要有較好的保存條件,如常規(guī)油氣需要有良好的區(qū)域性蓋層、相對(duì)穩(wěn)定的大地構(gòu)造環(huán)境和相對(duì)穩(wěn)定的水動(dòng)力條件,頁巖氣的保存條件需要從構(gòu)造條件、頁巖頂板和底板及自封閉能力和水動(dòng)力條件等進(jìn)行評(píng)價(jià)。但在較好的保存條件下,不同氣藏所對(duì)應(yīng)的地層壓力不同,如常規(guī)氣藏一般表現(xiàn)為常壓,致密氣藏既有異常高壓也有異常低壓,頁巖氣藏一般表現(xiàn)為異常高壓。

在傳統(tǒng)油氣地質(zhì)理論中,原來的油氣藏被破壞后,一部分油氣運(yùn)移至新的圈閉,再次聚集形成新的油氣藏,即次生油氣藏,還有一部分油氣運(yùn)移至地表,在地表形成各種各樣的油氣顯示,在某些情況下可以形成非常規(guī)油氣藏。如在南里海盆地中,斷裂作用先于烴源巖成熟或者與烴源巖成熟同時(shí)發(fā)生,油氣主要沿著斷裂帶運(yùn)移至地表淺層,遭受氧化、生物降解等作用形成油砂(圖4)[55]。

1.2 常規(guī)與非常規(guī)油氣成藏機(jī)理和模式對(duì)比

1.2.1 浮力成藏與非浮力成藏模式

傳統(tǒng)油氣地質(zhì)理論認(rèn)為,油氣二次運(yùn)移的主要?jiǎng)恿檫B續(xù)油氣柱在地層水中產(chǎn)生的浮力和地層水流動(dòng)產(chǎn)生的水動(dòng)力。在這幾種力(或以一種力為主)的作用下,油氣在儲(chǔ)層內(nèi)發(fā)生運(yùn)移、聚集。對(duì)于常規(guī)儲(chǔ)層,浮力和水動(dòng)力足以驅(qū)使油氣發(fā)生運(yùn)移。但在以納米級(jí)孔喉占儲(chǔ)集空間主體的致密儲(chǔ)層中,由于孔喉尺寸過小,其產(chǎn)生的毛細(xì)管阻力大,僅靠這兩種動(dòng)力無法使油氣突破細(xì)小的喉道進(jìn)行運(yùn)移[51]。陶士振等通過對(duì)四川盆地中北部蓬萊10井侏羅系自流井組大安寨段烴源巖進(jìn)行熱模擬試驗(yàn),認(rèn)為排烴后源巖剩余異常高壓為2.8 MPa,可突破孔喉半徑26 nm,增壓瞬時(shí)最高值可達(dá)38 MPa,可突破孔喉半徑117 nm,揭示了生烴增壓取代浮力成為致密油的主要運(yùn)聚動(dòng)力(圖5)[56]。Jiang等依據(jù)成藏期烴源巖排氣期與儲(chǔ)層致密演化關(guān)系及充注到儲(chǔ)層的天然氣是否受到浮力作用,將砂巖氣藏劃分為常規(guī)氣藏、致密常規(guī)氣藏、復(fù)合型致密氣藏和致密深盆氣藏4種類型(圖6)[57]。

1.2.2 單一賦存相態(tài)與多種賦存相態(tài)

在傳統(tǒng)油氣地質(zhì)理論中,油氣主要是以單一的游離態(tài)形式賦存;而非常規(guī)油氣是以游離態(tài)、吸附態(tài)和溶解態(tài)等多種相態(tài)共存。頁巖氣的賦存狀態(tài)主要有吸附氣、游離氣和溶解氣[58-60],生成的頁巖氣首先滿足有機(jī)質(zhì)和巖石顆粒表面吸附的需要,當(dāng)吸附氣量與溶解氣量達(dá)到飽和時(shí),富余的天然氣才以游離態(tài)進(jìn)行運(yùn)移和聚集[33,61-62];頁巖油在源巖中的賦存形態(tài)主要有兩種,即干酪根表面的吸附態(tài)及基質(zhì)孔隙、紋層與水平層面間、微裂縫中的游離態(tài)[63];致密油主要存在兩種賦存形態(tài)——油膜與油珠,油膜主要賦存于粒間孔和微裂縫,油珠主要賦存于粒內(nèi)孔[64]。

1.2.3 高點(diǎn)富集與滿盆含油氣

在傳統(tǒng)油氣地質(zhì)理論中,油氣嚴(yán)格受圈閉控制,包括單體型和集群型。單體型主要為構(gòu)造油氣藏,油氣聚集于構(gòu)造高點(diǎn),平面上呈孤立的單體式分布;集群型主要為巖性油氣藏和地層油氣藏,油氣聚集于較難識(shí)別的巖性圈閉和地層圈閉中,平面上呈較大范圍的集群式分布。非常規(guī)油氣分布在盆地中心、向斜或斜坡區(qū),大范圍“連續(xù)”分布,局部富集,突破了傳統(tǒng)二級(jí)構(gòu)造帶控制油氣分布的概念,有效勘探范圍可擴(kuò)展至全盆地。油氣具有大面積分布、豐度不均一的特征[7],易形成大油氣區(qū)。如致密砂巖氣是典型的非常規(guī)油氣聚集,空間上連續(xù)分布,砂巖地層普遍含氣,但含氣飽和度不均,缺乏明顯氣水界面與邊底水,油氣聚集邊界不明確。

2 非常規(guī)油氣資源潛力及啟示

2.1 非常規(guī)油氣資源潛力

2.1.1 全 球

雖然目前全球剩余常規(guī)油氣資源還比較豐富[9,65-66],但隨著勘探開發(fā)技術(shù)進(jìn)步和成本降低以及地區(qū)油氣供需不平衡矛盾的加劇,非常規(guī)油氣資源的勘探開發(fā)價(jià)值凸顯。據(jù)美國(guó)地質(zhì)調(diào)查局(USGS)、國(guó)際能源署(IEA)等有關(guān)機(jī)構(gòu)的研究結(jié)果,全球油氣資源總量約為50 600×108 t油當(dāng)量,重油、天然瀝青、致密油、油頁巖油和頁巖油等非常規(guī)石油資源量約為6 200×108 t,與常規(guī)石油資源量(4 878×108 t)相差不多,全球致密氣、煤層氣、頁巖氣和天然氣水合物等非常規(guī)天然氣資源量近3 922×1012 m3,大約是常規(guī)天然氣資源量(471×1012 m3)的8.3倍[9,67-70](圖7)。

2.1.2 中 國(guó)

與常規(guī)油氣資源相比,中國(guó)非常規(guī)油氣資源更為豐富(圖7)。中國(guó)油氣資源總量約為1 520×108 t油當(dāng)量。非常規(guī)石油資源量約為240×108 t,與常規(guī)石油資源量(200×108 t)大致相當(dāng)。非常規(guī)天然氣資源量約為100×1012 m3,是常規(guī)天然氣資源量(20×1012 m3)的5倍,發(fā)展?jié)摿艽骩71-74]。

中國(guó)非常規(guī)油氣勘探開發(fā)已在多個(gè)盆地取得重大突破。2014年,鄂爾多斯盆地蘇里格氣田致密氣年產(chǎn)量為235×108 m3;川中須家河組致密氣年產(chǎn)量為30×108 m3;鄂爾多斯盆地長(zhǎng)7段致密油年產(chǎn)量為83×104 t;鄂爾多斯盆地沁水地區(qū)煤層氣年產(chǎn)量為36×108 m3;四川盆地海相頁巖氣年產(chǎn)量為13×108 m3。

2.2 啟 示

隨著全球非常規(guī)油氣勘探開發(fā)的迅猛發(fā)展,傳統(tǒng)油氣地質(zhì)理論中的觀念也逐漸發(fā)生了改變。從以前認(rèn)為的由于單層厚度過大而不利于排烴的烴源巖層,轉(zhuǎn)變?yōu)轫搸r油氣勘探中較好的目的層,而且非常規(guī)油氣生、儲(chǔ)、蓋合為一體,突破了圈閉的限制。

傳統(tǒng)油氣地質(zhì)理論不但不把泥頁巖作為勘探目的層系,而且把其他孔隙度低、滲透性差的致密巖層也置之度外,不予考慮。這樣能作為有效儲(chǔ)層的巖層就相當(dāng)少了。非常規(guī)油氣地質(zhì)理論使人們打破了這種“畫地為牢”的儲(chǔ)層概念,打破圍繞烴源巖找圈閉的局限,突破傳統(tǒng)上尋找經(jīng)過二次運(yùn)移、圈閉油氣聚集的“源外找油”方法,使找油氣的領(lǐng)域更為寬廣,找油氣資源的潛力更大。

頁巖氣革命使原來未放在找油氣目標(biāo)內(nèi)的頁巖層系成為油氣勘探的目的層系、生產(chǎn)層系,在21世紀(jì)中期將成為重要的開采對(duì)象。這一重大創(chuàng)新和突破在油氣開發(fā)中產(chǎn)生了深遠(yuǎn)的影響,并引起不斷擴(kuò)大的連鎖反應(yīng),開始改變?nèi)蚝椭饕蜌馍a(chǎn)國(guó)、消費(fèi)國(guó)的能源構(gòu)成,引導(dǎo)著新世紀(jì)能源發(fā)展的方向。

3 結(jié) 語

(1)油氣地質(zhì)理論從常規(guī)油氣發(fā)展到非常規(guī)油氣,成藏條件的觀念也在發(fā)生變化。傳統(tǒng)油氣地質(zhì)理論認(rèn)為只能作為烴源巖和蓋層的泥頁巖,在非常規(guī)油氣地質(zhì)理論中當(dāng)作儲(chǔ)集層;由于孔滲過低而在以前認(rèn)為是無效儲(chǔ)層的致密砂巖和致密碳酸鹽巖現(xiàn)在也可作為勘探目的層;非常規(guī)油氣蓋層的評(píng)價(jià)方法與常規(guī)油氣不同;由于可以是大面積連續(xù)成藏,非常規(guī)油氣的聚集無圈閉限制,但會(huì)受到構(gòu)造樣式的影響;非常規(guī)油氣以原地滯留、初次運(yùn)移和短距離二次運(yùn)移為主,與常規(guī)油氣可以進(jìn)行長(zhǎng)距離二次運(yùn)移不同;常規(guī)油氣與非常規(guī)油氣都需要較好的保存條件,在某些情況下被破壞的常規(guī)油氣藏也可形成非常規(guī)油氣藏。

(2)油氣成藏機(jī)制方面,非常規(guī)油氣的運(yùn)聚主要受生烴增壓、毛細(xì)管力和擴(kuò)散作用力的影響;賦存狀態(tài)方面,與常規(guī)油氣一般只有游離態(tài)不同,非常規(guī)油氣有游離態(tài)、吸附態(tài)和溶解態(tài)等方式;常規(guī)油氣一般富集于構(gòu)造高點(diǎn),而非常規(guī)油氣大面積連續(xù)成藏。

(3)無論是全球范圍內(nèi)還是在中國(guó),非常規(guī)油氣資源潛力都遠(yuǎn)大于常規(guī)油氣,北美非常規(guī)油氣革命正推動(dòng)世界石油行業(yè)從常規(guī)油氣向非常規(guī)油氣轉(zhuǎn)移。要敢于突破傳統(tǒng)的思維模式,不斷重新認(rèn)識(shí)尋找油氣資源的新理論和新方法,這必將為中國(guó)未來油氣勘探的持續(xù)發(fā)展提供重要的指導(dǎo)與借鑒。

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