川西南地区五峰组—龙马溪组页岩特征研究
发布时间：2018-08-14 09:18
【摘要】：四川盆地上奥陶统-下志留统五峰组-龙马溪组为黑色页岩发育重要层位之一,是上扬子地区有利的页岩气勘探目的层。前人对川南、川东南地区五峰组-龙马溪组黑色页岩沉积特征、储层特征已经进行了大量的研究,而川西南地区的研究相对薄弱。因此,本文选取川西南雷波、威远地区剖面及大量地表、井下样品,通过实验分析,对川西南地区五峰组-龙马溪组页岩沉积特征、页岩气参数特征、储层纳米级孔隙发育控制因素及吸附气量控制因素进行了研究,并就研究区五峰组-龙马溪组黑色泥页岩与焦石坝地区五峰组-龙马溪组页岩气产层参数特征进行了对比,评价了研究区页岩气勘探潜力。研究结果表明:(1)川西南地区五峰组-龙马溪组泥页岩主要由刚性组分、塑性组分2种沉积组分组成;发育黑色富有机质泥页岩、粉砂质泥页岩、泥质粉砂岩、微晶灰岩4种岩相,其中硅质含量较高的黑色富有机质泥页岩过高Si O2为生物成因;发育深水陆棚和浅水陆棚沉积2种沉积亚相:深水陆棚主要为缺氧环境,主要沉积富有机质泥页岩、粉砂质泥页岩,有利于泥页岩有机质的富集,可形成较好的页岩气储层;浅水陆棚主要为贫养-富养环境,主要沉积微晶灰岩、粉砂质泥页岩及泥质粉砂岩,相对前者不利于有机质的保存。(2)川西南地区五峰组-龙马溪组泥页岩有机质为I、II1型;有机质含量纵向上以五峰组下段、龙马溪组下段最高,且普遍TOC2%;平面上以长宁-宜宾地区TOC2%的泥页岩最为发育;有机质热演化程度处于高成熟-过成熟阶段。(3)川西南地区五峰组下段、龙马溪组下段深水陆棚亚相相对于五峰组上段、龙马溪组上段浅水陆棚亚相石英含量高,黏土含量、碳酸盐岩含量低,有利于页岩气的开发。(4)川西南地区五峰组-龙马溪组泥页岩孔隙度主要分布在2%~10%之间,主要发育的孔隙类型有有机质孔、无机质孔、裂缝3种,发育墨水瓶型孔隙、平行狭缝内壁2种形态,后者相对于前者具有更高的孔隙体积和比表面积。微孔、介孔提供了主要的孔隙体积和孔隙比表面积,宏孔贡献不大。(5)川西南地区五峰组-龙马溪组泥页岩储层孔隙主要由有机质、矿物含量、成岩作用等因素控制,其中有机质主要控制了微孔(d2nm)、介孔(2nmd10nm)的发育,有机质含量越高、演化程度越高,微孔、介孔越发育,而对宏孔(d10nm)的控制作用不强;黏土矿物一定程度上控制了介孔的发育,对于微孔、宏孔的控制作用不强;碳酸盐岩对于泥页岩纳米级孔隙控制的作用不强;不同来源、含量的石英均对于泥页岩纳米级孔隙有不同的控制作用,生物来源石英有利于泥页岩纳米级孔隙的发育,而陆源石英则不利于泥页岩纳米级孔隙的发育;成岩演化过程中的压实作用、胶结作用、重结晶作用不利于孔隙的形成,而溶蚀作用、黏土矿物的转化有利于孔隙的发育,且主要控制了宏孔的发育。(6)富有机质泥页岩气体吸附量随压力的增大而增加,最终达到稳定;随温度的增加而较小。孔隙结构、有机质含量主要从内因上控制了研究区富有机质泥页岩气体吸附量的大小,有机质含量越高、纳米级孔隙越发育,吸附能力越强。(7)研究区富有机质泥页岩与焦石坝地区五峰组-龙马溪组页岩气产层具有一定的相似性也有差异性,研究区构造相对稳定区域具有一定的勘探潜力。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
【参考文献】
相关期刊论文 前9条
1 冉波;刘树根;孙玮;杨迪;王世玉;叶sズ，
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