| 准噶尔盆地隆起区石炭系顶面不整合及其意义及其意义 |
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| 引用本文： | 毛 翔,李江海,张华添,李维波,王 洛.准噶尔盆地隆起区石炭系顶面不整合及其意义及其意义[J].古地理学报,2014,16(4):527-536. |
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| 作者姓名： | 毛 翔 李江海 张华添 李维波 王 洛 |
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| 作者单位： | 1.造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871
2 北京大学石油与天然气研究中心,北京100871
3 中国地质科学院地质力学研究所,北京100037 |
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| 基金项目： | 国家重点基础研究发展计划“973计划”(编号:2009CB219302)资助 |
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| 摘 要： | 石炭系风化壳是准噶尔盆地火山岩油气储集层的主要类型,物性明显好于同时代原生型火山岩。通过对陆梁隆起滴西地区的铸体薄片与岩心观测,发现风化淋滤对火山岩储集性能的改造主要体现在孔隙上,对裂缝的改造作用不明显。由于火山岩形成的构造环境与古地貌存在差异,不同的海拔高度决定了其接受风化时间的长短。准噶尔盆地内石炭系不整合上覆地层时代存在明显差异,下二叠统至白垩系均有分布。最长风化时长在东部隆起约为150Ma,在陆梁隆起约为100Ma,在西部隆起约为55Ma;而3处隆起最少则仅缺失部分上石炭统-下二叠统。风化时长的长短与火山岩孔隙度的大小呈近波峰状对应关系,火山岩孔隙度初始随风化时长的增大(至约30Ma)逐渐增大,在到达峰值(对应风化时长约40Ma)后随时长的增大(55～100Ma)逐渐减小。最大的孔隙度均出现在火山角砾岩和玄武岩中,安山岩的孔隙度次之,而凝灰岩的孔隙度最小。
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| 关 键 词： | 准噶尔盆地 石炭系 火山岩风化壳 不整合 时长 |
| 收稿时间： | 2013-10-10 |
Unconformity overlying the Carboniferous in uplift areas of Junggar Basin and its significance for reservoirs |
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| Mao Xiang,Li Jianghai,Zhang Huatian,Li Weibo,Wang Luo.Unconformity overlying the Carboniferous in uplift areas of Junggar Basin and its significance for reservoirs[J].Journal of Palaeogeography,2014,16(4):527-536. |
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| Authors: | Mao Xiang Li Jianghai Zhang Huatian Li Weibo Wang Luo |
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| Institution: | 1.The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,;
School of Earth and Space Sciences,Peking University,Beijing 100871;2.Institute of Oil and Gas,Peking University,Beijing 100871;
3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | Carboniferous volcanic weathered crust, whose petrophysical feature is better than that of contemporary primary volcanic reservoirs, is one of the major volcanic reservoirs in Junggar Basin. The observation of casting thin sections and drill cores from Dixi area in Luliang Uplift shows that the improvement by weathering and leaching is more effective at pore space than fracture. The altitude of volcanic rocks,influenced by tectonic settings and palaeogeomorphology,determined the weathering duration. Ages of the strata overlying the Carboniferous vary from the Lower Permian to the Cretaceous,and suggest the duration of weathering changes greatly in different areas. The longest weathering duration is about 150Ma in eastern uplift,100Ma in Luliang uplift and only 55Ma in western uplift. The shortest stratigraphic break in the three uplifts,however, only lacks part of the Upper Carboniferous and Lower Permian. There is a wave corresponding relationship between the weathering duration and the volcanic reservoir porosity. The porosity increases with weathering duration changing from 0 to 30Ma,gets to the peak when weathering duration is about 40Ma,and decreases as the weathering duration gradually increases from about 55 to 100Ma. Concerning the lithological influence on porosity,volcanic lava and volcanic breccia have the largest porosity,andesite comes second and tuff has the smallest porosity. |
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| Keywords: | Junggar Basin Carboniferous volcanic weathering crust unconformity time span |
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