本文選題：成巖作用 + 孔隙結(jié)構(gòu)�。� 參考：《西北大學(xué)》2015年碩士論文

【摘要】：鄂爾多斯盆地中部的延長探區(qū)內(nèi)上三疊統(tǒng)延長組長8砂巖儲(chǔ)層油氣顯示較好,探明儲(chǔ)量大,展現(xiàn)了良好的勘探潛力。本文針對該區(qū)長8砂巖儲(chǔ)層的礦物組分、物性與孔隙結(jié)構(gòu)特征、成巖作用、油氣充注期次及時(shí)間等方面的研究薄弱點(diǎn),利用普通薄片與鑄體薄片顯微鏡下鑒定與定量統(tǒng)計(jì)、熒光薄片微束熒光分析、X-射線衍射、電鏡掃描、激光拉曼流體包裹體成分分析與均一溫度測定等多種分析測試手段,系統(tǒng)研究了長8砂巖儲(chǔ)層的巖石學(xué)特征、孔隙結(jié)構(gòu)、主要成巖作用類型及成巖演化序列、流體包裹體特征及油氣充注期次、成巖-烴類充注過程等內(nèi)容,以期有助于正確認(rèn)識(shí)和理解成巖作用對砂巖物性的影響、探討成巖-成藏動(dòng)力學(xué)過程控制的流體-巖石相互作用系統(tǒng)及其時(shí)空演變機(jī)制,進(jìn)一步指導(dǎo)油氣勘探開發(fā)。研究成果揭示,長8砂巖儲(chǔ)層以巖屑質(zhì)長石砂巖為主,總體上成分成熟度低,結(jié)構(gòu)成熟度中等,膠結(jié)物主要為碳酸鹽膠結(jié)物和伊利石黏土礦物。在經(jīng)歷了壓實(shí)作用、膠結(jié)作用、溶蝕作用、交代作用等成巖作用之后,砂巖儲(chǔ)層變成了特低孔低滲儲(chǔ)層,孔隙度平均為6.65%,滲透率平均為0.24mD。壓實(shí)作用和膠結(jié)作用是儲(chǔ)層孔隙度喪失的主要因素,由此造成的平均孔隙度喪失率分別為24.8%和8.9%。因此,壓實(shí)作用對儲(chǔ)層儲(chǔ)集物性的破壞程度甚于膠結(jié)作用；溶蝕作用產(chǎn)生的粒間溶孔和長石溶孔在一定程度上改善了儲(chǔ)層物性,溶蝕作用增加的孔隙平均為3.5%。研究區(qū)長8砂巖普遍進(jìn)入了中成巖A期,期間經(jīng)歷了包括壓實(shí)作用、膠結(jié)作用、三期油氣充注作用、二期溶蝕作用等成巖作用過程,其成巖演化序列為：機(jī)械壓實(shí)作用→泥晶方解石-→粘土膜(綠泥石膜Ⅰ)→烴類Ⅰ→石英次生加大Ⅰ→綠泥石膜Ⅱ→伊/蒙混層→溶蝕作用Ⅰ→烴類Ⅱ→石英次生加大Ⅱ→亮晶方解石Ⅰ→高嶺石→粒間伊利石、綠泥石膠結(jié)→濁沸石→構(gòu)造裂縫→溶蝕作用Ⅱ→烴類Ⅲ→亮晶方解石Ⅱ。建立在儲(chǔ)層成巖作用、流體包裹體特征與油氣充注、成巖-烴類充注演化時(shí)間序列研究、地層埋藏?zé)崾贩治龌A(chǔ)上的長8砂巖的成巖-烴類充注演化過程綜合研究結(jié)果表明,長8儲(chǔ)層經(jīng)歷過三期油氣充注-成巖演化過程：第一期油氣充注發(fā)生在早成巖階段A-B期,充注時(shí)間為中侏羅世(約169～161Ma,地層埋深1200-1400m),充注規(guī)模小,主要分布在綠泥石薄膜保存的原生孔隙中,本期油氣充注未捕獲與之對應(yīng)的流體包裹體；第二期油氣充注發(fā)生早成巖階段B期的晚侏羅世到早白堊世早期(148-135Ma),地層埋深達(dá)到1500～1900m,油氣主要分布在顆粒邊緣和少量溶蝕孔中,對應(yīng)捕獲流體包裹體顯示的峰值溫度為70～90℃；第三期烴類充注發(fā)生在早白堊世晚期(125.2～105.7Ma),地層埋深達(dá)到2300-3100m,規(guī)模最大,為最主要的成藏期,油氣大量分布在各種溶蝕孔和裂縫中,對應(yīng)捕獲流體包裹體顯示的峰值溫度為100～120℃,此階段后晚期亮晶方解石膠結(jié)使得巖石變得低孔低滲。
[Abstract]:The upper three superposition of Yanchang Group 8 sandstone reservoir in the middle part of the Ordos Basin shows good oil and gas display, the proven reserves are large, and good exploration potential is shown. In this paper, the weak points of mineral composition, physical property and pore structure characteristics, diagenesis, oil gas filling period and time in the long 8 sandstone reservoir in this area are studied. The lithologic characteristics, pore structure and main diagenesis of long 8 sandstone reservoirs are systematically studied by the identification and quantitative statistics of ordinary thin slices and cast thin slices, microbeam fluorescence analysis, X- ray diffraction, electron microscope scanning, composition analysis of laser Raman fluid inclusions and uniform temperature measurement. The evolution sequence of diagenesis, the characteristics of fluid inclusions and the filling period of oil and gas, the process of diagenesis and hydrocarbon filling, will be helpful to correctly understand and understand the effect of diagenesis on the physical properties of sandstone, and discuss the fluid rock interaction system controlled by the dynamic process of diagenesis and reservoir formation and its spatio-temporal evolution mechanism, and further guide the exploration of oil and gas. The research results reveal that the long 8 sandstone reservoirs are mainly lithic feldspar sandstone, with low maturity and medium maturity, and the cementation is mainly carbonate cementation and illite clay minerals. After the compaction, cementation, dissolution and metasomatism, the sandstone reservoirs become extremely low Kong Di. The porosity of the reservoir is 6.65%, the average permeability is 0.24mD. compaction and cementation is the main factor of porosity loss. The resulting porosity loss rate is 24.8% and 8.9%., respectively. The feldspar dissolution pores have improved the physical properties of the reservoir to a certain extent. The increase of porosity is the average of the 8 sandstone in the 3.5%. research area, which generally entered the A stage of the middle diagenesis. During the period, it experienced the process of compaction, cementation, three phases of oil gas filling and two phases of dissolution, and the evolution sequence of the diagenesis was mechanical compaction. Clay crystal calcite - clay film (chlorite membrane I) - hydrocarbon I - I - quartz secondary enlargement I - I - chlorite membrane II - I / montmorillonite - I - II - quartz secondary increase II to quartz secondary calcite I - Kaolinite - intergranular illite, chlorite cementation, turbid turbid, corrosion - II - III - Bright crystal calcite II. Based on the reservoir diagenesis, fluid inclusion characteristics, oil gas filling, diagenesis and hydrocarbon filling evolution time series, the comprehensive study on the evolution process of diagenesis and hydrocarbon filling of long 8 sandstone based on the thermal history analysis shows that the long 8 reservoir has experienced three stages of oil gas filling and diagenetic evolution process: first The period of oil and gas filling occurred in the A-B period of the early diagenesis stage, and the filling time was middle Jurassic (about 169 ~ 161Ma, buried depth 1200-1400m), and the filling was small, mainly distributed in the primary pores preserved in the chlorite film, and the oil and gas filling in this period did not capture the fluid inclusions corresponding to it, and the second phase of oil and gas filling occurred in the late stage of the early diagenetic stage of the late Jurassic period. From early Cretaceous to early Cretaceous (148-135Ma), the buried depth of the strata reached 1500 ~ 1900m. The oil and gas were mainly distributed in the edge of the particles and a small amount of corrosion holes. The peak temperature corresponding to the trapped fluid inclusions was 70~90. The third hydrocarbon filling occurred in the late Early Cretaceous (125.2 ~ 105.7Ma), the depth of the stratum was 2300-3100m and the largest scale. For the most important period of reservoir formation, oil and gas are widely distributed in various dissolution pores and cracks. The peak temperature of the trapped fluid inclusions is 100~120 C. Later, late bright calcite cementation makes the rock lower and low permeability.

【學(xué)位授予單位】：西北大學(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10條

1 張莉;朱筱敏;鐘大康;崔可平;;惠民凹陷古近系砂巖儲(chǔ)層物性控制因素評(píng)價(jià)[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2007年01期

2 黃思靜,謝連文,張萌,武文慧,沈立成,劉潔;中國三疊系陸相砂巖中自生綠泥石的形成機(jī)制及其與儲(chǔ)層孔隙保存的關(guān)系[J];成都理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年03期

3 蔣凌志,顧家裕,郭彬程;中國含油氣盆地碎屑巖低滲透儲(chǔ)層的特征及形成機(jī)理[J];沉積學(xué)報(bào);2004年01期

4 李忠;劉嘉慶;;沉積盆地成巖作用的動(dòng)力機(jī)制與時(shí)空分布研究若干問題及趨向[J];沉積學(xué)報(bào);2009年05期

5 柳益群,李文厚;陜甘寧盆地東部上三疊統(tǒng)含油長石砂巖的成巖特點(diǎn)及孔隙演化[J];沉積學(xué)報(bào);1996年03期

6 黃思靜;龔業(yè)超;黃可可;佟宏鵬;;埋藏歷史對碳酸鹽溶解—沉淀的影響——以四川盆地東北部三疊系飛仙關(guān)組和塔里木盆地北部奧陶系為例[J];地球科學(xué)進(jìn)展;2010年04期

7 張立飛;蒙皂石伊利石化的三種成因機(jī)制[J];地學(xué)前緣;1994年Z1期

8 謝奕漢,范宏瑞,王英蘭;流體包裹體與盆地油氣的生成和演化[J];地質(zhì)科技情報(bào);1998年S1期

9 柳益群;關(guān)于成巖作用與變質(zhì)作用界線的討論——從沸石相談起[J];地質(zhì)論評(píng);1996年03期

10 羅靜蘭;劉小洪;林潼;張三;李博;;成巖作用與油氣侵位對鄂爾多斯盆地延長組砂巖儲(chǔ)層物性的影響[J];地質(zhì)學(xué)報(bào);2006年05期

相關(guān)博士學(xué)位論文 前3條

1 邸領(lǐng)軍;鄂爾多斯盆地基底演化及沉積蓋層相關(guān)問題的控究[D];西北大學(xué);2003年

2 趙新智;鄂爾多斯盆地隴東地區(qū)低滲透儲(chǔ)層特征及分級(jí)評(píng)價(jià)[D];中國地質(zhì)大學(xué);2012年

3 尚婷;鄂爾多斯盆地華慶地區(qū)長8儲(chǔ)層微觀特征研究[D];西北大學(xué);2012年

相關(guān)碩士學(xué)位論文 前3條

1 樊婷婷;鄂爾多斯盆地南部上三疊統(tǒng)延長組儲(chǔ)層成巖作用研究[D];西北大學(xué);2008年

2 林文姬;蘇里格地區(qū)盒8段低滲儲(chǔ)層特征及其成因[D];中國地質(zhì)大學(xué)（北京）;2009年

3 吳春燕;鎮(zhèn)北地區(qū)三疊系延長組長8油層組沉積相研究[D];西北大學(xué);2009年

，

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