| 层序界面对砂岩成岩作用及储层质量的影响——以鄂尔多斯盆地延河露头上三叠统延长组为例 |
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| 引用本文： | 罗忠,罗平,张兴阳,刘柳红,陈飞,张玄杰.层序界面对砂岩成岩作用及储层质量的影响——以鄂尔多斯盆地延河露头上三叠统延长组为例[J].沉积学报,2007,25(6):903-914. |
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| 作者姓名： | 罗忠 罗平 张兴阳 刘柳红 陈飞 张玄杰 |
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| 作者单位： | 中国矿业大学(北京)资源与地球科学系 北京 100083 |
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| 基金项目： | 国家十五科技攻关项目资助 |
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| 摘 要： | 砂岩成岩作用及储层质量是油气勘探的重要研究内容，不同地区砂岩成岩作用及储层质量的主要控制因素各不相同。本文以鄂尔多斯盆地东部延河露头剖面延长组长7上部—长4+5中部三角洲前缘—三角洲平原沉积为例，重点讨论三级层序界面（长16底）上下不同基准面半旋回中砂岩自生矿物、储集空间类型、储集性能和含油性差异及造成这些差异的原因。指出层序界面之下的下降半旋回中浊沸石和早期钙质砂岩结核的发育阻止了绿泥石等粘土矿物及自生石英和自生钠长石的发育，而界面之上的上升半旋回中因凝灰质不足以及地层温度较低造成浊沸石发育有限，加之受湖水影响较小而缺乏早期方解石胶结物，因而绿泥石等自生粘土矿物及自生石英和自生钠长石较为发育，并保留了一部分原生孔隙。层序界面及紧邻其上大规模发育的长16砂体成为流体运移的优势通道，是界面之上浊沸石、方解石胶结物及长石颗粒被酸性流体溶蚀形成次生孔隙的重要因素，也是石油的重要运移通道和储集体。
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| 关 键 词： | 层序界面 基准面旋回 成岩作用 储层质量 延长组 延河露头 鄂尔多斯盆地 |
| 文章编号： | 1000-0550（2007）06-0903-12 |
| 收稿时间： | 2007-02-07 |
| 修稿时间： | 2007-06-06 |
Effect of Sequence Boundary on Sandstones Diagenesis and Reservoir Quality: an outcrop study from the Upper Triassic Yanchang Formation, Ordos Basin, Northwest China |
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| LUO Zhong,LUO Ping,ZHANG Xing-yang,LIU Liu-hong,CHEN Fei,ZHANG Xuan-jie.Effect of Sequence Boundary on Sandstones Diagenesis and Reservoir Quality: an outcrop study from the Upper Triassic Yanchang Formation, Ordos Basin, Northwest China[J].Acta Sedimentologica Sinica,2007,25(6):903-914. |
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| Authors: | LUO Zhong LUO Ping ZHANG Xing-yang LIU Liu-hong CHEN Fei ZHANG Xuan-jie |
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| Institution: | Department of Resources and Earth Science, China University of Mining and Technology, Beijing 100083 |
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| Abstract: | Diagenesis and reservoir quality in sandstones are important research scopes for petroleum exploration.Taking the delta front to delta plain facies from upper Chang 7 to middle Chang 4 5 member of Yanchang Formation,Yanhe River outcrop,eastern Ordos Basin as an example,this paper addresses the differences of authigenetic minerals,porosity types,petrophysical attributes and oil-showing in sandstones between base-level semi-rising and semi-downing cycles,and their origins.Both of abundant laumontite and early calcite cement in concretion prevent the formation of authigenetic minerals including chlorite,chlorite/smectite,quartz-overgrowth and albite-overgrowth in base-level semi-downing cycle under the 3rd sequence stratigraphic boundary surface,whereas authigenetic chlorite,chlorite/smectite,quartz-overgrowth and albite-overgrowth are relatively well developed resulting from poor development of laumontite cement owing to lack of tuffaceous deposites and lower formation temperature,and lack of early calcite cement due to little influence of lake in base-level semi-rising cycle above the 3rd sequence stratigraphic boundary sequence.The 3rd sequence boundary surface together with well developed Chang16sandbodies immediately above the sequence boundary surface was the predominant fluid conduits through which acidic fluid,which dissolved laumontite and calcite cement and feldspar grains,and oil migrated originated from the mature source rocks. |
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| Keywords: | sequence boundary diagenesis reservoir quality Yanchang Formation Yanhe River Outcrop Ordos Basin |
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