| 松辽盆地营城组火山岩相量化表征与应用 |
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| 引用本文： | 吴颜雄,王璞珺,闫林,吴艳辉.松辽盆地营城组火山岩相量化表征与应用[J].岩石学报,2010,26(1):73-81. |
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| 作者姓名： | 吴颜雄 王璞珺 闫林 吴艳辉 |
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| 作者单位： | 1. 吉林大学地球科学学院,长春,130061
2. 中国石油勘探开发研究院,北京,100083 |
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| 基金项目： | 本文受国家“973”项目(2009CB19303和2007CB209507)资助. |
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| 摘 要： | 盆地火山岩及其储层的地震解释需要量化的岩相模型提供地质约束。三维揭露的盆缘剖面是实现岩相量化表征的最佳区。在松辽盆地东南隆起营城组建组剖面区开展了爆发相、喷溢相和侵出相的三维量化研究。爆发相出现在火山旋回早期,延伸千米量级、厚度百米量级,外形呈楔形尖灭状,坡度上陡下缓、呈平均15°左右的上凹形轮廓;始于热基浪亚相、向上为热基浪与空落亚相互层,终于热碎屑流亚相。喷溢相多出现在火山旋回中后期,覆于爆发相之上,延伸千米量级、厚度百米量级,外形呈凸透镜向外尖灭状,坡度上缓下陡、呈平均20°左右的上凸形轮廓;自下而上依次为下部、中部和上部亚相。侵出相出现在火山旋回后期,可见对其它相带呈切割-披覆关系的内、中、外三个亚相,侧向延伸和垂向厚度多为百米量级、通常最大不超过1km,呈顶缓缘陡的蘑菇状。用火山岩相模型约束井旁地震解释、建立岩相-地震相响应关系,可为无井区的火山岩地震识别提供模板。火山机构的后期改造只改变相序的完整性、不改变原始喷发相带间的相邻与相依性,不影响用岩相模式预测相变关系。非同源喷出物之间的叠置会干扰盆地火山岩相的解译,且使岩相模型的约束作用失效。
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| 关 键 词： | 松辽盆地 营城组 火山岩相量化表征 火山岩相地震响应 火山岩储层 |
| 收稿时间： | 2009/5/18 0:00:00 |
| 修稿时间： | 2009/11/1 0:00:00 |
Quantitative modelling and application of volcanic facies of Lower Cretaceous Yingcheng Formation of the Songliao Basin |
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| WU YanXiong,WANG PuJun,YAN LIN and WU YanHui.Quantitative modelling and application of volcanic facies of Lower Cretaceous Yingcheng Formation of the Songliao Basin[J].Acta Petrologica Sinica,2010,26(1):73-81. |
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| Authors: | WU YanXiong WANG PuJun YAN LIN and WU YanHui |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China;College of Earth Sciences, Jilin University, Changchun 130061, China;Exploration and Development Research Institute of PetroChina, Beijing 100083, China;College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | Seismic interpretation of volcanic rocks and corresponding reservoirs in petroliferous basins need to be disciplined by quantitative geological models. Three-dimensional sections outcroped on basin margin provide us with the best natural lab for us to construct quantitative models of volcanic facies. 3-D quantitative modelling of the major volcanic facies including explosive, effusive and extrusive has been carried out in the stratotype succession of Yingcheng Formation (K1y) of southeast uplift of the Songliao Basin. Explosive facies were developed in the early volcanic eruption cycles. Lateral-extension and vertical-thickness of the explosive facies is some thousand and several hundred meters respectively. They are wedge-shaped with a steeper upper slope and gentler lower slope showing an average slope angle of 15°. Successions of the explosive subfacies, from bottom to top, include base surge deposits, interbedding base surge and air-fall, and pyroclastic flow deposits. Effusive facies generally occured in the middle of an eruption cycle and covered on top of the explosive facies. They can extend up to some thousand meters and get a thickness up to several hundred meters. They are lenticular-shaped and pinch out laterally, with a gentler upper slope and steeper lower slope showing an average slope angle of 20°. Successions of the effusive subfacies from bottom to top include lower, middle and upper units. Extrusive facies generally occured at the end of an eruption cycle and are composed of inner, middle and outer units. They often cut through and cover other lithofacies. Their stretches and thickness are usually no more than 1km. They are mushroom-shaped with a large flat roof and sharp border. Applying the above volcanic facies models to borehole-pass-by seismic interpretation, we established the respondence between volcanic facies and seismic information, with the help of which we may understand the meanings of seismic profiles of non-well areas. Erosion of a volcanic edifice will destroy parts of its facies but can not change the facies sequence, so that, it will not disturb the application of the facies models mentioned. On the other hand, if a volcanic body is composed of materials derived from different sources, called superimposed volcanic ediffice, application of these facies models may become problematic. |
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| Keywords: | Songliao Baisn Yingcheng Formation Quantitative modelling of volcanic facies Seismic response of volcanic facies Volcanic reservoir |
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