新疆准噶尔东部火烧山二叠系平地泉组和吉木萨尔芦草沟组方沸石特征及与致密油的关系
发布时间：2018-10-29 19:01
【摘要】：方沸石(analcime)是一种富钠的铝硅酸盐矿物,其理想结构的化学分子式为Na16Al16Si32096_16H20,可形成于沉积岩、火山岩等多种成因类型的岩石中,常与其他沸石矿物共生。方沸石在中国新疆地区二叠系中较为发育,对于胶结相中的自生方沸石已有文献报道,多数都针对其在成岩作用方面的机理与意义,而其他类型的方沸石鲜^有报道。笔者所在的研究团队近年来在对新疆北部二叠系致密油的研究中发现了含量丰富的方沸石,本文根据研究团队对准噶尔东部火烧山背斜的中二叠统平地泉组和吉木萨尔凹陷的中二叠统芦草沟组的研究认识,结合岩石薄片、X衍射、电子探针等方法,对平地泉组及芦草沟组的方沸石特征及成因进行论述与探讨。研究区二叠系平地泉组和芦草沟组中方沸石主要出现于凝灰岩、沉凝灰岩、凝灰质白云岩、白云岩、灰岩、砂岩与方沸石岩(方沸石含量25%)中。方沸石在沉凝灰岩中广泛发育,平均含量约7%;凝灰岩中方沸石的分布不均匀,平均含量约3.9%,但21个样品中仅8个样品含有方沸石,最高可达23.1%;其他几种岩性中方沸石含量差别不大,约为6%左右。方沸石发育的岩层常为层状、透镜状构造;微观上,以自形、半自形及它形三种形态出现。自形方沸石又可根据其产状结构分为分散粒状、斑状与脉状;半自形方沸石以分散粒状及团块状为主;它形方沸石可见胶结状与充填状。火烧山地区Si02含量约为59.6%,吉木萨尔地区约为62.3%,而两地Al。0A的含量与Na20的含量近似,分别在19%～23%与5.3%～10.4%之间,方沸石的平均Si/Al分别为2.57与2.58,但火烧山地区浮动较大,最小为2.22,最大为2.83。方沸石的岩石学、矿物学特征及物质成分表明方沸石极有可能来源于中-酸性火山岩,通过火山玻璃、长石或粘土矿物与碱性水反.应而来,并且火烧山地区的方沸石具有更为复杂的成因即:有原生方沸石的参与。.方沸石的分布与显示的区域呈现出良好的匹配度,且方沸石含量的变化趋势与孔隙度、渗透率的变化趋势大致相同。方沸石对于储层的物性的影响体现在:一方面方沸石的存在增加了储层的渗透率与孑孔隙度,这有利于形成优势储层,另一方面方沸石的出现抵抗了压实作用的影响,因此颗粒间的原生孔隙得以大量保存下来。
[Abstract]:Analite (analcime) is a kind of aluminosilicate mineral rich in sodium. The chemical formula of its ideal structure is Na16Al16Si32096_16H20, which can be formed in sedimentary rocks, volcanic rocks and other types of rocks, and is often symbiotic with other zeolite minerals. The analcite is relatively developed in the Permian system in Xinjiang, China. Most of the literatures have reported the mechanism and significance of the authigenic zeolite in the cemented phase, while the other types have been reported. In recent years, the author's research team has found abundant donalites in the study of Permian dense oil in the northern part of Xinjiang. Based on the understanding of the research team on the Middle Permian Pingdiquan formation in the Huozaoshan anticline in eastern Junggar and the Lucaogou formation of the Middle Permian in the Jimusar Sag, this paper combines the methods of thin rock slice, X-ray diffraction, electron probe and so on. The characteristics and origin of andalite in Pingdiquan formation and Lucaogou formation are discussed and discussed. The Chinese zeolites of the Permian Pingdiquan formation and the Lucaogou formation are mainly found in tuff, dolomite, limestone, sandstone and analite (25% content of clinoptilolite). Analcite is widely developed in sedimentary tuff with an average content of about 70.The distribution of Chinese zeolite in tuff is not uniform, the average content is about 3.9, but only 8 samples of 21 samples contain amotite, the highest is 23.1%. The content of other lithologic Chinese zeolites is about 6%. The rock layers developed by donalites are usually layered and lenticular, and appear in three morphologies: automorphism, hemiautomorphism and heteromorphism microscopically. According to its occurrence structure, it can be divided into dispersed granular, porphyry and vein-like, semi-automorphic andalpinite is mainly dispersed granular and bulk, and it can be seen cemented and filled. The content of Si02 was about 59.6% in Huozaoshan area and 62.3% in Jimusar area, while the content of Al.0A in the two places was similar to that of Na20, ranging from 1923% to 5.3% and 10.4%, respectively. The average Si/Al of donalite is 2.57 and 2.58, respectively, but the minimum is 2.22 and the maximum is 2.83 in the burning mountain area. The petrology, mineralogical characteristics and material composition of donalites indicate that they are most likely derived from intermediate-acid volcanic rocks, which are reversed with alkaline water through volcanic glass, feldspar or clay minerals. In addition, the analcite in the burning mountain area has a more complicated origin, that is, the primary donitic zeolite is involved. The distribution of andalite shows a good match with the displayed area, and the change trend of content of donitic zeolite is similar to that of porosity and permeability. On the one hand, the presence of donalite increases the permeability and solitude of the reservoir, which is conducive to the formation of superior reservoir, and on the other hand, the presence of donosite resists the effect of compaction. As a result, primary pores between particles are preserved in large quantities.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P578.974
，
本文编号：2298521
[Abstract]:Analite (analcime) is a kind of aluminosilicate mineral rich in sodium. The chemical formula of its ideal structure is Na16Al16Si32096_16H20, which can be formed in sedimentary rocks, volcanic rocks and other types of rocks, and is often symbiotic with other zeolite minerals. The analcite is relatively developed in the Permian system in Xinjiang, China. Most of the literatures have reported the mechanism and significance of the authigenic zeolite in the cemented phase, while the other types have been reported. In recent years, the author's research team has found abundant donalites in the study of Permian dense oil in the northern part of Xinjiang. Based on the understanding of the research team on the Middle Permian Pingdiquan formation in the Huozaoshan anticline in eastern Junggar and the Lucaogou formation of the Middle Permian in the Jimusar Sag, this paper combines the methods of thin rock slice, X-ray diffraction, electron probe and so on. The characteristics and origin of andalite in Pingdiquan formation and Lucaogou formation are discussed and discussed. The Chinese zeolites of the Permian Pingdiquan formation and the Lucaogou formation are mainly found in tuff, dolomite, limestone, sandstone and analite (25% content of clinoptilolite). Analcite is widely developed in sedimentary tuff with an average content of about 70.The distribution of Chinese zeolite in tuff is not uniform, the average content is about 3.9, but only 8 samples of 21 samples contain amotite, the highest is 23.1%. The content of other lithologic Chinese zeolites is about 6%. The rock layers developed by donalites are usually layered and lenticular, and appear in three morphologies: automorphism, hemiautomorphism and heteromorphism microscopically. According to its occurrence structure, it can be divided into dispersed granular, porphyry and vein-like, semi-automorphic andalpinite is mainly dispersed granular and bulk, and it can be seen cemented and filled. The content of Si02 was about 59.6% in Huozaoshan area and 62.3% in Jimusar area, while the content of Al.0A in the two places was similar to that of Na20, ranging from 1923% to 5.3% and 10.4%, respectively. The average Si/Al of donalite is 2.57 and 2.58, respectively, but the minimum is 2.22 and the maximum is 2.83 in the burning mountain area. The petrology, mineralogical characteristics and material composition of donalites indicate that they are most likely derived from intermediate-acid volcanic rocks, which are reversed with alkaline water through volcanic glass, feldspar or clay minerals. In addition, the analcite in the burning mountain area has a more complicated origin, that is, the primary donitic zeolite is involved. The distribution of andalite shows a good match with the displayed area, and the change trend of content of donitic zeolite is similar to that of porosity and permeability. On the one hand, the presence of donalite increases the permeability and solitude of the reservoir, which is conducive to the formation of superior reservoir, and on the other hand, the presence of donosite resists the effect of compaction. As a result, primary pores between particles are preserved in large quantities.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P578.974
，
本文编号：2298521
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2298521.html
