發(fā)布時(shí)間：2018-11-26 09:54

【摘要】：由眾多的研究資料顯示,中國頁巖氣資源豐富,在富集條件上與美國有相似之處,但地質(zhì)條件的差異較大,因此不能照搬美國的開發(fā)模式,應(yīng)注重頁巖氣地質(zhì)特性的研究。通過對(duì)川北地區(qū)下侏羅統(tǒng)東岳廟段的頁巖氣資料考察,認(rèn)為其主要為湖相沉積,資源潛力良好,且含有一定量的脆性礦物,利于后期壓裂改造,但埋深普遍較大,總體勘探程度較低,故可以對(duì)其頁巖氣的富集規(guī)律進(jìn)行細(xì)致研究,尋找和確定“甜點(diǎn)”,對(duì)后期的生產(chǎn)起指導(dǎo)作用,能夠決定高產(chǎn)和采收率。本文通過川北地區(qū)的前人資料綜合分析,以及中石化勘探區(qū)塊的鉆井、地物地化資料的收集,結(jié)合巖芯觀察、野外實(shí)地考察、典型剖面的測(cè)制、巖石薄片鏡下鑒定、地物地化送樣分析等,對(duì)川北地區(qū)下侏羅統(tǒng)東岳廟段的頁巖氣富集規(guī)律進(jìn)行多學(xué)科、多方法的綜合研究,主要得出以下認(rèn)識(shí):(1)發(fā)育湖泊和湖泊三角洲兩種沉積相類型,主要以湖泊為主,濱湖、淺湖及半深湖沉積廣泛分布。(2)建立了適合研究區(qū)的一套泥頁巖劃分標(biāo)準(zhǔn):在砂巖和灰?guī)r層段中,連續(xù)厚度大于2m且泥地比小于40%作為常規(guī)油氣系統(tǒng);在泥頁巖層段中,連續(xù)厚度大于9m,泥地比大于60%作為泥頁巖油氣系統(tǒng)。(3)富有機(jī)質(zhì)泥頁巖有機(jī)地化分析顯示,其干酪根類型以III型為主,但是II1和II2型所占比例也較大,有機(jī)質(zhì)豐度為較好的烴源巖,有機(jī)質(zhì)成熟度高,屬凝析油-濕氣階段,但頁巖氣含氣性不如美國好。(4)富有機(jī)質(zhì)泥頁巖以粘土礦物、石英為主,可見少量長(zhǎng)石和方解石,其中脆性礦物含量總體中等偏多,楊氏模量和泊松比顯示泥頁巖具有較好的脆性,且抗壓強(qiáng)度整體上并不高。(5)富有機(jī)質(zhì)泥頁巖物性分析顯示,泥頁巖主要發(fā)育有機(jī)孔、無機(jī)孔(粒內(nèi)孔、粒間孔、晶間孔)及裂縫系統(tǒng)(宏觀裂縫和微裂縫),平均孔隙度和滲透率均較高,孔隙度和滲透率總體呈正相關(guān)關(guān)系。(6)研究頁巖氣的成藏機(jī)理,認(rèn)為溫度、壓力、有機(jī)碳含量、熱演化程度、礦物成分、孔隙和裂縫等因素影響頁巖氣的含氣量,而沉積相、巖相、裂縫和隔離層決定頁巖氣的富集高產(chǎn),并優(yōu)選元壩西部地區(qū)、元壩東南-儀隴地區(qū)以及達(dá)州西北地區(qū)為有利區(qū)。
[Abstract]:According to many research data, China is rich in shale gas resources and has similarities with the United States in the enrichment conditions, but the geological conditions are quite different, so it is not possible to copy the American development model, so we should pay attention to the study of the geological characteristics of shale gas. Based on the investigation of shale gas data in Dongyemiao formation of Lower Jurassic in northern Sichuan, it is considered that the shale gas is mainly lacustrine sedimentary, with good resource potential and a certain amount of brittle minerals, which is conducive to later fracturing reconstruction, but the depth of burial is generally larger. The overall exploration degree is relatively low, so it is possible to study carefully the law of shale gas enrichment, to find and determine the "dessert", to guide the later production, and to determine the high yield and oil recovery. Based on the comprehensive analysis of previous data in northern Sichuan, drilling and geochemistry data collection in exploration blocks of Sinopec, core observation, field investigation, typical profile measurement and microscopic identification, Based on the analysis of geo-chemical samples and so on, this paper makes a multidisciplinary and multi-method study on the law of shale gas enrichment in the Dongyemiao section of the Lower Jurassic in northern Sichuan. The main conclusions are as follows: (1) two types of sedimentary facies, lake and lake delta, are developed. The sediments of littoral lake shallow lake and semi-deep lake are widely distributed. (2) A set of shale classification criteria suitable for the study area is established: in sandstone and limestone formation. The continuous thickness is more than 2m and the ratio of mud to soil is less than 40% as the conventional oil and gas system. In the shale formation, the continuous thickness is more than 9 m and the ratio of mud to soil is more than 60% as the shale oil and gas system. (3) the organic geochemistry analysis of organic matter rich shale shows that the kerogen type is mainly III type. However, the proportion of II1 and II2 type is also large, organic matter abundance is good source rock, organic matter maturity is high, it belongs to condensate oil-wet gas stage, but gas content of shale gas is not as good as that of the United States. (4) the organic matter rich shale is clay mineral. Quartz is dominant, a small amount of feldspar and calcite can be seen, among them, the content of brittle minerals is generally moderate, and the Young's modulus and Poisson's ratio show that shale has better brittleness. The compressive strength is not high on the whole. (5) the organic pore, inorganic pore (intragranular pore, intergranular pore) and fracture system (macroscopic fracture and micro-fracture) are mainly developed in the shale, which is rich in organic matter. The average porosity and permeability are all high, and the porosity and permeability are positively correlated. (6) the mechanism of shale gas accumulation is studied. It is considered that temperature, pressure, organic carbon content, thermal evolution degree, mineral composition, temperature, pressure, organic carbon content, thermal evolution degree, mineral composition, temperature, pressure, organic carbon content, thermal evolution degree, mineral composition, The porosity and fracture influence the gas content of shale gas, while sedimentary facies, lithofacies, fracture and isolation layer determine the enrichment and high yield of shale gas, and the favorable areas are the west area of Yuanba, the southeast of Yuanba and Yilong area and the northwest of Dazhou.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 童曉光;郭建宇;王兆明;;非常規(guī)油氣地質(zhì)理論與技術(shù)進(jìn)展[J];地學(xué)前緣;2014年01期

2 王慶波;劉若冰;魏祥峰;倪楷;高紅賢;;陸相頁巖氣成藏地質(zhì)條件及富集高產(chǎn)主控因素分析——以元壩地區(qū)為例[J];斷塊油氣田;2013年06期

3 魏祥峰;黃靜;李宇平;王慶波;劉若冰;文治東;;元壩地區(qū)大安寨段陸相頁巖氣富集高產(chǎn)主控因素[J];中國地質(zhì);2014年03期

4 董大忠;鄒才能;楊樺;王玉滿;李新景;陳更生;王世謙;呂宗剛;黃勇斌;;中國頁巖氣勘探開發(fā)進(jìn)展與發(fā)展前景[J];石油學(xué)報(bào);2012年S1期

5 李玉喜;喬德武;姜文利;張春賀;;頁巖氣含氣量和頁巖氣地質(zhì)評(píng)價(jià)綜述[J];地質(zhì)通報(bào);2011年Z1期

6 吳馨;任志勇;王勇;劉長(zhǎng)海;李洋冰;趙都菁;曲日濤;齊玉民;;世界頁巖氣勘探開發(fā)現(xiàn)狀[J];資源與產(chǎn)業(yè);2013年05期

相關(guān)博士學(xué)位論文 前1條

1 徐勝林;晚三疊世—侏羅紀(jì)川西前陸盆地盆山耦合過程中的沉積充填特征[D];成都理工大學(xué);2010年

，

本文編號(hào)：2358214