| 巴楚地区碳酸盐岩中深成侵入岩特征及其对储层发育的影响 |
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| 引用本文： | 聂保锋,于炳松,朱金富.巴楚地区碳酸盐岩中深成侵入岩特征及其对储层发育的影响[J].地学前缘,2008,15(2):90-99. |
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| 作者姓名： | 聂保锋 于炳松 朱金富 |
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| 作者单位： | 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 为了深入探讨深部岩浆活动对碳酸盐岩储层发育的影响,文中通过显微鉴定、地球化学分析以及流体包裹体测试,对巴楚地区和3井奥陶纪钻遇的火成岩进行了详细研究。和3井碳酸盐岩中的火成岩是紫苏辉长岩,为深成侵入岩体,辉长岩的w(SiO2)介于44.89%～45.39%,w(K2O+Na2O)为4.04%～4.67%,w(Na2O)/w(K2O)为2.16～4.23,属钠质碱性系列,形成于板内构造环境。微量元素分配模式以Ba富集Sr亏损为特征。∑REE介于163.43×10-6～215.99×10-6,LREE/HREE介于5.14～5.58,LaN/YbN介于5.192～5.980,δEu介于0.926～1.002,稀土配分模式属轻稀土富集型,通过对和3井碳酸盐岩孔隙度、渗透率以及其中流体包裹体的分析,孔隙度和渗透率的变化与辉长岩的分布有关,流体包裹体温度介于62～161℃,和3井碳酸盐岩受到过热事件的影响,辉长岩的侵入改善了和3井碳酸盐岩的储层物性。
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| 关 键 词： | 巴楚地区 辉长岩 地球化学 流体包裹体 碳酸盐岩改造 |
| 文章编号： | 1005-2321(2008)02-0090-10 |
| 修稿时间： | 2007年12月20 |
The characteristics of intrusive rocks and their influence on carbonate reservoir development in the Bachu area, Tarim basin |
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| Nie Baofeng,Yu Bingsong,Zhu Jinfu.The characteristics of intrusive rocks and their influence on carbonate reservoir development in the Bachu area, Tarim basin[J].Earth Science Frontiers,2008,15(2):90-99. |
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| Authors: | Nie Baofeng Yu Bingsong Zhu Jinfu |
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| Abstract: | Through the microscopic identification,geochemical analysis and fluid inclusion investigation,we studied the igneous rocks from the Well He-3 in the Bachu area.The composition of gabbro in the Well He-3 shows that w(SiO2) 44.89%-45.39%,w(K2O+Na2O) 4.04%-4.67%,and w(Na2O) /w(K2O) 2.16-4.23;the rock is rich in Ba with a negative Sr anomaly;∑REE(163.43-215.99)×10-6,LREE/HREE 5.14-5.58,LaN/YbN 5.192-5.980,and δEu 0.926-1.002.The chemical characteristics and tectonic diagram show that the rock occurs in a typical within-plate environment,and belongs to the Na-rich alkaline series.Primary fluid inclusions from the carbonate in the Well He-3 nearby the gabbro intrusion have the homogenization temperature between 62 ℃ and 161 ℃.These data and the data of permeability and porosity indicate that the hydrothermal alternation has occurred in the Ordovician carbonate,which is likely to improve the reservoir quality. |
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| Keywords: | Bachu area gabbro geochemistry fluid inclusions carbonate alteration |
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