川西南地區(qū)五峰組—龍馬溪組頁巖特征研究
發(fā)布時間：2018-08-14 09:18
【摘要】：四川盆地上奧陶統(tǒng)-下志留統(tǒng)五峰組-龍馬溪組為黑色頁巖發(fā)育重要層位之一,是上揚子地區(qū)有利的頁巖氣勘探目的層。前人對川南、川東南地區(qū)五峰組-龍馬溪組黑色頁巖沉積特征、儲層特征已經(jīng)進行了大量的研究,而川西南地區(qū)的研究相對薄弱。因此,本文選取川西南雷波、威遠地區(qū)剖面及大量地表、井下樣品,通過實驗分析,對川西南地區(qū)五峰組-龍馬溪組頁巖沉積特征、頁巖氣參數(shù)特征、儲層納米級孔隙發(fā)育控制因素及吸附氣量控制因素進行了研究,并就研究區(qū)五峰組-龍馬溪組黑色泥頁巖與焦石壩地區(qū)五峰組-龍馬溪組頁巖氣產(chǎn)層參數(shù)特征進行了對比,評價了研究區(qū)頁巖氣勘探潛力。研究結(jié)果表明:(1)川西南地區(qū)五峰組-龍馬溪組泥頁巖主要由剛性組分、塑性組分2種沉積組分組成;發(fā)育黑色富有機質(zhì)泥頁巖、粉砂質(zhì)泥頁巖、泥質(zhì)粉砂巖、微晶灰?guī)r4種巖相,其中硅質(zhì)含量較高的黑色富有機質(zhì)泥頁巖過高Si O2為生物成因;發(fā)育深水陸棚和淺水陸棚沉積2種沉積亞相:深水陸棚主要為缺氧環(huán)境,主要沉積富有機質(zhì)泥頁巖、粉砂質(zhì)泥頁巖,有利于泥頁巖有機質(zhì)的富集,可形成較好的頁巖氣儲層;淺水陸棚主要為貧養(yǎng)-富養(yǎng)環(huán)境,主要沉積微晶灰?guī)r、粉砂質(zhì)泥頁巖及泥質(zhì)粉砂巖,相對前者不利于有機質(zhì)的保存。(2)川西南地區(qū)五峰組-龍馬溪組泥頁巖有機質(zhì)為I、II1型;有機質(zhì)含量縱向上以五峰組下段、龍馬溪組下段最高,且普遍TOC2%;平面上以長寧-宜賓地區(qū)TOC2%的泥頁巖最為發(fā)育;有機質(zhì)熱演化程度處于高成熟-過成熟階段。(3)川西南地區(qū)五峰組下段、龍馬溪組下段深水陸棚亞相相對于五峰組上段、龍馬溪組上段淺水陸棚亞相石英含量高,黏土含量、碳酸鹽巖含量低,有利于頁巖氣的開發(fā)。(4)川西南地區(qū)五峰組-龍馬溪組泥頁巖孔隙度主要分布在2%~10%之間,主要發(fā)育的孔隙類型有有機質(zhì)孔、無機質(zhì)孔、裂縫3種,發(fā)育墨水瓶型孔隙、平行狹縫內(nèi)壁2種形態(tài),后者相對于前者具有更高的孔隙體積和比表面積。微孔、介孔提供了主要的孔隙體積和孔隙比表面積,宏孔貢獻不大。(5)川西南地區(qū)五峰組-龍馬溪組泥頁巖儲層孔隙主要由有機質(zhì)、礦物含量、成巖作用等因素控制,其中有機質(zhì)主要控制了微孔(d2nm)、介孔(2nmd10nm)的發(fā)育,有機質(zhì)含量越高、演化程度越高,微孔、介孔越發(fā)育,而對宏孔(d10nm)的控制作用不強;黏土礦物一定程度上控制了介孔的發(fā)育,對于微孔、宏孔的控制作用不強;碳酸鹽巖對于泥頁巖納米級孔隙控制的作用不強;不同來源、含量的石英均對于泥頁巖納米級孔隙有不同的控制作用,生物來源石英有利于泥頁巖納米級孔隙的發(fā)育,而陸源石英則不利于泥頁巖納米級孔隙的發(fā)育;成巖演化過程中的壓實作用、膠結(jié)作用、重結(jié)晶作用不利于孔隙的形成,而溶蝕作用、黏土礦物的轉(zhuǎn)化有利于孔隙的發(fā)育,且主要控制了宏孔的發(fā)育。(6)富有機質(zhì)泥頁巖氣體吸附量隨壓力的增大而增加,最終達到穩(wěn)定;隨溫度的增加而較小�？紫督Y(jié)構(gòu)、有機質(zhì)含量主要從內(nèi)因上控制了研究區(qū)富有機質(zhì)泥頁巖氣體吸附量的大小,有機質(zhì)含量越高、納米級孔隙越發(fā)育,吸附能力越強。(7)研究區(qū)富有機質(zhì)泥頁巖與焦石壩地區(qū)五峰組-龍馬溪組頁巖氣產(chǎn)層具有一定的相似性也有差異性,研究區(qū)構(gòu)造相對穩(wěn)定區(qū)域具有一定的勘探潛力。
[Abstract]:The Upper Ordovician-Lower Silurian Wufeng Formation-Longmaxi Formation in Sichuan Basin is one of the important layers for the development of black shale and is a favorable target for shale gas exploration in the Upper Yangtze area. Therefore, this paper chooses Leibo and Weiyuan section in southwest Sichuan and a large number of surface and underground samples, and through experimental analysis, studies the sedimentary characteristics, shale gas parameters, nano-scale pore development control factors and adsorbed gas control factors of Wufeng Formation-Longmaxi Formation in southwest Sichuan, and the five peaks in the study area. The results show that: (1) the shale of Wufeng Formation-Longmaxi Formation in southwestern Sichuan is mainly composed of rigid components, while the shale of plastic components is composed of two sedimentary components. Organic mudstone shale, silty mudstone shale, argillaceous siltstone and microcrystalline limestone are four lithofacies, of which the black rich organic mudstone shale with high siliceous content is biogenic; there are two sedimentary sub-facies: deep shelf and shallow shelf: deep shelf is mainly anoxic environment, mainly organic mudstone shale and silty mudstone shale. Shallow water shelf mainly deposits microcrystalline limestone, silty mudstone shale and argillaceous siltstone, which is not conducive to the preservation of organic matter. (2) Wufeng-Longmaxi mudstone shale organic matter in southwestern Sichuan is type I, type II1; organic matter content; Longmaxi Formation has the highest TOC2% in the lower part of the Wufeng Formation, and TOC2% in the lower part of the Longmaxi Formation is the most developed in the Changning-Yibin area. The organic matter thermal evolution is in the high maturity-over maturity stage. (3) In the lower part of the Wufeng Formation in southwestern Sichuan, the deep-water shelf subfacies in the lower part of the Longmaxi Formation is relative to the upper part of the Wufeng Formation. The shallow shelf subfacies has high quartz content, clay content and low carbonate content, which is favorable for shale gas development. (4) The porosity of the Wufeng-Longmaxi mudstone shale is mainly distributed between 2% and 10%. The main pore types are organic pore, inorganic pore, fracture, ink bottle pore and parallel slit inner wall. Compared with the former, the latter has higher pore volume and specific surface area. Micropores provide the main pore volume and pore specific surface area, while macropores have little contribution. (5) The pores of Wufeng-Longmaxi mudstone shale reservoir in southwestern Sichuan are mainly controlled by organic matter, mineral content and diagenesis, among which organic matter is the main one. Controlling the development of micropores (d2nm) and mesopores (2nmd10nm), the higher the content of organic matter, the higher the degree of evolution, the more the micropores and mesopores develop, but the control of macropores (d10nm) is not strong; clay minerals control the development of mesopores to a certain extent, but the control of micropores and macropores is not strong; carbonate rocks control the nano-pore of shale. Quartz from different sources and contents has different controlling effects on the nano-scale pores of shale. Biogenic quartz is beneficial to the development of nano-scale pores of shale, while terrestrial quartz is not conducive to the development of nano-scale pores of shale. (6) The gas adsorption capacity of organic-rich shale increases with the increase of pressure, and eventually reaches a stable level; it decreases with the increase of temperature. The pore structure and the content of organic matter mainly control the rich organic matter from the internal cause. (7) There are some similarities and differences between the shale gas production layers of Wufeng Formation-Longmaxi Formation in Jiaoshiba area and the shale gas production layers of organic shale, and there is a certain exploration potential in the relatively stable tectonic area.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
[Abstract]:The Upper Ordovician-Lower Silurian Wufeng Formation-Longmaxi Formation in Sichuan Basin is one of the important layers for the development of black shale and is a favorable target for shale gas exploration in the Upper Yangtze area. Therefore, this paper chooses Leibo and Weiyuan section in southwest Sichuan and a large number of surface and underground samples, and through experimental analysis, studies the sedimentary characteristics, shale gas parameters, nano-scale pore development control factors and adsorbed gas control factors of Wufeng Formation-Longmaxi Formation in southwest Sichuan, and the five peaks in the study area. The results show that: (1) the shale of Wufeng Formation-Longmaxi Formation in southwestern Sichuan is mainly composed of rigid components, while the shale of plastic components is composed of two sedimentary components. Organic mudstone shale, silty mudstone shale, argillaceous siltstone and microcrystalline limestone are four lithofacies, of which the black rich organic mudstone shale with high siliceous content is biogenic; there are two sedimentary sub-facies: deep shelf and shallow shelf: deep shelf is mainly anoxic environment, mainly organic mudstone shale and silty mudstone shale. Shallow water shelf mainly deposits microcrystalline limestone, silty mudstone shale and argillaceous siltstone, which is not conducive to the preservation of organic matter. (2) Wufeng-Longmaxi mudstone shale organic matter in southwestern Sichuan is type I, type II1; organic matter content; Longmaxi Formation has the highest TOC2% in the lower part of the Wufeng Formation, and TOC2% in the lower part of the Longmaxi Formation is the most developed in the Changning-Yibin area. The organic matter thermal evolution is in the high maturity-over maturity stage. (3) In the lower part of the Wufeng Formation in southwestern Sichuan, the deep-water shelf subfacies in the lower part of the Longmaxi Formation is relative to the upper part of the Wufeng Formation. The shallow shelf subfacies has high quartz content, clay content and low carbonate content, which is favorable for shale gas development. (4) The porosity of the Wufeng-Longmaxi mudstone shale is mainly distributed between 2% and 10%. The main pore types are organic pore, inorganic pore, fracture, ink bottle pore and parallel slit inner wall. Compared with the former, the latter has higher pore volume and specific surface area. Micropores provide the main pore volume and pore specific surface area, while macropores have little contribution. (5) The pores of Wufeng-Longmaxi mudstone shale reservoir in southwestern Sichuan are mainly controlled by organic matter, mineral content and diagenesis, among which organic matter is the main one. Controlling the development of micropores (d2nm) and mesopores (2nmd10nm), the higher the content of organic matter, the higher the degree of evolution, the more the micropores and mesopores develop, but the control of macropores (d10nm) is not strong; clay minerals control the development of mesopores to a certain extent, but the control of micropores and macropores is not strong; carbonate rocks control the nano-pore of shale. Quartz from different sources and contents has different controlling effects on the nano-scale pores of shale. Biogenic quartz is beneficial to the development of nano-scale pores of shale, while terrestrial quartz is not conducive to the development of nano-scale pores of shale. (6) The gas adsorption capacity of organic-rich shale increases with the increase of pressure, and eventually reaches a stable level; it decreases with the increase of temperature. The pore structure and the content of organic matter mainly control the rich organic matter from the internal cause. (7) There are some similarities and differences between the shale gas production layers of Wufeng Formation-Longmaxi Formation in Jiaoshiba area and the shale gas production layers of organic shale, and there is a certain exploration potential in the relatively stable tectonic area.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
【參考文獻】
相關(guān)期刊論文 前9條
1 冉波;劉樹根;孫瑋;楊迪;王世玉;葉sズ，
本文編號：2182403
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