基性熔岩火山地层单元类型、特征及其储层意义

发布时间：2018-01-15 07:30

本文关键词：基性熔岩火山地层单元类型、特征及其储层意义　出处：《中南大学学报(自然科学版)》2016年01期 　论文类型：期刊论文

【摘要】：为了探索基性熔岩的火山地层单元类型、特征与叠置关系,精选中国东北3个具有代表性的基性熔岩露头区和松辽盆地徐家围子断陷典型钻井,进行露头剖面二维测量、钻井岩心观察、盆内钻井和地震解释。研究结果表明:基性熔岩火山地层单元由冷凝固结成岩方式形成,根据外部形态可分为辫状、扇状、板状和管状4类,前3类均由基性岩浆地表溢流形成,管状熔岩流由岩浆于隐伏管道(lava tube)中流动形成。基性熔岩火山地层单元内部结构可用孔-缝带进行表征。辫状熔岩流从上到下由泡沫状气孔带、稀疏气孔带和底部气孔带构成。扇状熔岩流在泡沫状气孔带上部发育自碎角砾岩带,在稀疏气孔带下部发育厚度不大的致密带。板状熔岩流在稀疏气孔带下部发育厚度较大的致密带。管状熔岩流由外圈环形柱状节理带和内部自碎角砾核心构成。火山地层单元的形态和叠置关系直接约束了火山岩岩性、岩相和储层在火山地层中的时空分布特征,形成了基性熔岩火山地层内部层状、似层状和交织-透镜状3种孔隙分布模式。该研究可以为利用露头、钻井、地震实现火山地层和储层的精细刻画提供理论依据。
[Abstract]:In order to explore the types of volcanic stratigraphic units, characteristics and superposition of basic lava, three representative basic lava outcrops in Northeast China and typical drilling wells in Xujiaweizi fault depression in Songliao Basin are selected. Two-dimensional outcrop profile survey, drilling core observation, in-basin drilling and seismic interpretation are carried out. The results show that the basic lava volcanic formation unit is formed by cold solidification and rock formation, and can be divided into braided according to the external morphology. Fan-shaped, plate-shaped and tube-shaped, the first three types are formed by the surface overflow of basic magma. Flow of tubular lava from magma to concealed pipe lava tube). The internal structure of the basic lava volcanic stratigraphic unit can be characterized by pore-fracture zone. The braided lava flow flows from top to bottom from the foaming pore zone. The fan lava flow develops self-breaking breccia zone in the foam stomatal zone. The thicker dense zone is developed in the lower part of the sparse stomatal zone, and the thicker dense zone is developed in the lower part of the sparse stomatal zone. The tubular lava flow is composed of the outer ring cylindrical joint zone and the inner self-breaking breccia core. The morphology and superposition of volcanic stratigraphic units directly constrain the lithology of volcanic rocks. The space-time distribution characteristics of lithofacies and reservoir in volcanic strata have formed three pore distribution models of basic lava volcanic strata such as stratiform and interleaved lenticular. This study can be used to drill well by outcrop. Earthquakes provide theoretical basis for the fine characterization of volcanic strata and reservoirs.
【作者单位】：吉林大学地球科学学院;吉林大学古生物学与地层学研究中心;
【基金】：国家自然科学基金资助项目(41472304) 国家重点基础研究发展规划(973计划)项目(2012CB822002,2009CB219303)~~
【分类号】：P539
【正文快照】： breccia zone on the rich vesicular zone,and a thin dense zone under the spare vesicular zone.The tabular lava flow unitshave a thick dense zone under the spare vesicular zone.The tube lava flow consists of a loop columnar zone in the outerring and an aut

【参考文献】