| 准噶尔盆地东部石炭纪富火山岩海相油气盆地原型:一个工作假说 |
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| 引用本文： | 王清晨,阳孝法,陶辉飞.准噶尔盆地东部石炭纪富火山岩海相油气盆地原型:一个工作假说[J].地质科学,2012,0(4):921-940. |
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| 作者姓名： | 王清晨 阳孝法 陶辉飞 |
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| 作者单位： | 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室 北京 100029 |
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| 摘 要： | 准噶尔盆地石炭系中发现自生自储的大型火山岩油气藏,这不仅大大拓宽了油气勘探领域,而且从含油气盆地原型恢复角度为我们提出了一个新的命题。本文对准噶尔盆地东部的石炭纪盆地进行了剖析,在井间地层对比和锆石U-Pb同位素年代学测定基础上,确定了准噶尔盆地石炭系划分方案,建立了准东地区及邻区石炭系的5条联井对比骨干地质剖面,进而把准东地区石炭系盆地的充填过程划分为两个旋回、7个阶段,其中第一旋回为早石炭世,进一步分为4个阶段,第1至第3阶段以各种火山岩发育为特征,第4阶段为火山活动的间歇期,发育了暗色泥质岩。第二旋回为晚石炭世,进一步分为3个阶段,第5和第6两个阶段以发育中基性火山岩为特征,第7阶段以沉火山凝灰岩和与泥质岩、砂岩互层发育为特征。文中归纳了准东地区石炭纪盆地及其中火山岩油气藏烃源岩和储层的发育特点,建立了其盆地原型,指出准东地区石炭系在沉积时的构造古地理以多岛洋为特征,受准噶尔洋的持续向北东方向俯冲的影响,准东地区盆地基底向南西方向倾斜,造成了沉积中心的向南西迁移。考虑到盆地位于增生型造山带内,将其原型盆地称为增生楔盆地。文中特别指出,任何构造位置上形成的盆地都有形成大油气田的潜力,能否形成大油气田的关键在于有没有优质烃源岩、优质储层和有效圈闭。准东增生楔盆地中烃源岩与火山岩储层的空间关系十分密切,二者往往形成互层状或穿插状,这一特征决定了盆地中油气产出具有近源性,而圈闭的形成则因火山岩储层的成层性差而呈形态和类型的多样性。
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| 关 键 词： | 增生楔盆地 石炭纪 准噶尔盆地 |
| 收稿时间： | 2012-06-06 |
| 修稿时间： | 2012-06-06; |
Prototype of a Carboniferous petroliferous volcano-sedimentary basin in the eastern Junggar Basin:A working hypothesis |
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| Wang Qingchen,Yang Xiaofa,Tao Huifei.Prototype of a Carboniferous petroliferous volcano-sedimentary basin in the eastern Junggar Basin:A working hypothesis[J].Chinese Journal of Geology,2012,0(4):921-940. |
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| Authors: | Wang Qingchen Yang Xiaofa Tao Huifei |
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| Institution: | The State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029 |
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| Abstract: | The discovery of Carboniferous igneous hydrocarbon reservoirs in the Junggar Basin has not only enlarged prospect of petroleum exploration,but also put forward a new theme in reconstructing the prototype of petroliferous basin with igneous hydrocarbon reservoirs.The present paper,based on inter-well correlation and zircon U-Pb dating,suggested stratigraphic correlation schedule and 5 profiles across the Junggar Basin.The eastern Junggar Basin was filled in Carboniferous through two cycles and 7 steps.The first cycle is in the Early Carboniferous and could be subdivided into 4 steps.The steps 1～3 are characterized by various igneous rocks and the step 4 by dark colored mudstone indicating a quiet period in igneous activity.The second cycle is in the Late Carboniferous and could be subdivided into 3 steps.The steps 5～6 are characterized by intermediate-basic igneous rocks and the step 7 by interlayered sedimentary tuff and mudstone as well as sandstone.The present paper summarized the main characters of hydrocarbon source rock and reservoir rock and put forward a hypothetic prototype.The eastern Junggar Basin was an archipelago during Carboniferous.Northeastward subduction of the Carboniferous Junggar ocean caused southwest migration of depositional center in the eastern Junggar Basin.The prototype of the Carboniferous eastern Junggar Basin was named as accretionary basin for its position in accretionary orogenic belt.In fact,giant petroliferous basin could be formed in many kinds of tectonic background,if basin possesses good hydrocarbon source rock,reservoir rock and effective trap.In the eastern Junggar Accretionary Basin,hydrocarbon source rock and reservoir rock have intimate spatial links.Their interlayer or interfinger occurrence result in that oil-gas reservoirs always form near hydrocarbon source,and that reservoirs themselves develop in various shapes and types because of irregular shape and poor layering of igneous rocks. |
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| Keywords: | Accretionary basin Carboniferous The Junggar Basin |
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