摘要
青岛灵山岛南背来石剖面发育了两层大型不规则砂脉。其主要特征如下:上层大型不规则砂脉呈分散团块状顺黄褐色凝灰质泥岩分布,断续延伸约60 m,宽数米;有17个侵入砂团块。砂团块多呈浅灰色,主要岩性为砂岩、砂砾岩;砂团块直径在1~2 m。砂团块的形态非常复杂,侧向极易尖灭或突然中止。边界与围岩多突变,某些地方与节理发育方向相同。下层大型不规则砂脉浅灰色,主要底部为砂岩、顶部为砂砾岩,呈透镜状顺层产于灰黑色薄层砂泥岩中,均一团块状和边缘含大量泥砾;厚18 m,宽度和高度不详;上层砂脉发育在浅湖中;下层大型不规则砂脉发育在三角洲前缘。与此同时还探讨了上层砂脉的形成的动力学机制,建立了顺层砂脉的形成深度与液化层的深度之间的关系式(h_i=0.29H_i)。该公式可以用来预测顺层的侵位深度和寻找砂脉,为含油气盆地砂脉储层预测提供理论依据和新方法。通过流化公式计算获得了形成上层砂脉的流体上侵速度为1.26 m/s。通过本文的论述,进一步为理解灵山岛地区下白垩统的沉积环境和沉积动力学特征提供了新的岩石学证据。
There are two large irregular sand sills in the southern Beilaishi profile of Lingshan Island,Qingdao City.The main features are as follows:the upper large irregular sills are distributed in scattered clumps along the yellow-brown tuff mudstone,brokenly with a total length of about 60 meters and a few meters wide;there are 17 intrusive sand clumps(sills).The main sand sills clusters are light grey sandstone and/or conglomerate.Sand clusters are 1~2 m in diameter.The shapes of sand sill cluster are very complex,and the sill side is easily bifurcated,pinched out or abruptly terminated.The boundary and surrounding rock have many abrupt changes,and some places are controlled by joints.The large irregular sand sill in the lower layer is dark gray,mainly composed of sandstone at the bottom and sandy conglomerate at the top.The lenticular shape is produced in the gray-black thin layer of sand and mudstone.The largest thickness is about 18 m thick,and its width and height have not known.Upper sand dikes developed in shallow lakes;The lower large irregular large sand dikes developed in the delta front.The development of large irregular sand dikes in Lingshan Island may be related to earthquake-induced liquefaction.At the same time,the dynamic mechanism of the formation of the upper sand dyke was also discussed,and the relationship between the formation depth of the bedding sand vein and the depth of the liquefaction layer was established(h_i=0.29 H_i).The formula can be used to predict the intruding depth of sills and search for sills,which provides a theoretical basis and a new method for sill-type reservoir prediction in oil-bearing basins.The fluid jet velocity of the upper sill was calculated by minimum fluidization velocity(Umf)formula to be 1.26 m/s.This paper provides new petrographic evidence for understanding the sedimentary environment and sedimentary dynamics of the lower cretaceous in Lingshan island area.
作者
钟建华
倪良田
汪立东
宋全友
孙宁亮
宋冠先
薛纯琦
郝兵
邵珠福
毛毳
刘闯
曹梦春
ZHONG Jianhua;NI Liangtian;WANG Lidong;SONG Quanyou;SUN Ningliang;SONG Guanxian;XUE Chunqi;HAO Bing;SHAO Zhufu;MAO Cui;LIU Chuang;CAO Mengchun(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Bejing,100083;Postdoctoral Scientific Research Station,Shengli Oilfield Company Ltd.,SINOPEC,Dongying,Shandong,257000;Daqing Oilfield Company Ltd.,Exploration Utility Department,Daqing,Heilongjiang,163453;School of Geoscience,China University of Petroleum,Qingdao,Shandong,266580;School of Earth Sciences,Northeast Petroleum Univesity,Daqing,Heilongjiang,163318)
出处
《地质论评》
CAS
CSCD
北大核心
2020年第6期1457-1476,共20页
Geological Review
基金
国家自然基金资助项目(编号:41572088、42072138)的成果。
关键词
大型砂脉
动力学
下白垩统
灵山岛
large-scale dykes(sills)
dynamics
lower Cretaceous
Lingshan Island,Qingdao
