| 地质流体对砂岩储层黏土矿物的影响——以渤海海域古近系为例 |
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| 引用本文： | 臧春艳,王渝,齐玉民,杨纪磊,赵伟.地质流体对砂岩储层黏土矿物的影响——以渤海海域古近系为例[J].世界地质,2015,34(3):766-773. |
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| 作者姓名： | 臧春艳 王渝 齐玉民 杨纪磊 赵伟 |
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| 作者单位： | 中海油能源发展股份有限公司 工程技术分公司渤海实验中心，天津 300452 |
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| 摘 要： | 根据偏光显微镜、扫描电镜和X-衍射等分析手段获取的数据和资料,分析对比了早期沉积水介质、幔源CO2流体、大气水、超压流体和充注烃类等对储层黏土矿物的控制作用。研究表明,早期沉积水介质是储层黏土矿物的决定性因素,微咸水-半咸水湖盆储层黏土矿物以伊利石为主,淡水湖盆储层黏土矿物以高岭石为主;幔源CO2流体侵位后带来明显的储层改造和热波动效应,储层中I/S中S%含量低于同深度泥岩,储层中高岭石含量明显偏高。欠压实超压储层中黏土演化明显滞后,表现在I/S中S%含量低于同深度泥岩和常压储层。油气层高岭石含量往往远高于相近深度的水层,可能与充注烃类携带的有机酸的溶蚀作用有关,另外,烃类充注后形成的惰性成岩环境也有利于高岭石的保存,高岭石的高含量带常与油层及高渗层相对应;受大气水淋滤的储层,以长石大量溶蚀,富含高岭石为特征,储层孔隙度一般较高。
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| 关 键 词： | 地质流体 碎屑岩储层 黏土矿物 渤海 古近系 |
Influences of geological fluids on clay minerals in sandstone reservoirs:a case study of Paleogene in Bohai Sea |
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| ZANG Chun-Yan,WANG Yu,QI Yu-Min,YANG Ji-Lei,ZHAO Wei.Influences of geological fluids on clay minerals in sandstone reservoirs:a case study of Paleogene in Bohai Sea[J].World Geology,2015,34(3):766-773. |
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| Authors: | ZANG Chun-Yan WANG Yu QI Yu-Min YANG Ji-Lei ZHAO Wei |
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| Institution: | Drilling ＆ Production Co． of Subsidiary of CNOOC Energy Technology ＆ Services Limited，Tianjin 300452，China |
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| Abstract: | By methods of thin section，scanning electron microscope and X- ray diffraction，the authors ana- lyzed the controlling effects of the early sedimentary water medium，CO2 fluid，atmospheric water，and overpressure fluid，as well as the hydrocarbon fluid to clay mineral in reservoir． Evidence showed that the sedimentary water me- dium played a decisive role in determining the constitution of clay minerals: the sand reservoirs deposited in brack- ish water lake，which often accompany with higher illite content; while the sand reservoir deposited in fresh water environment，which often accompany with higher kaolinite content． The invasion of CO2 fluid could bring obvious reservoir reconstruction and thermal fluctuation， the S percentage content of I/S in the CO2-bearing reservoir is low- er than mudstone at approximate depth，and the content of kaolinite in the reservoir is higher． The clay evolution in under- compaction overpressure reservoir is obviously lag behind，indicating that the S% content in I/S is lower than the same depth of mudstone as well as normal pressure reservoir． After hydrocarbon invasion，it is often accompanied by feldspar dissolution and the higher content of kaolinite． The feldspar dissolution may result from the organic acids migrating with hydrocarbon，the higher content of kaolinite may result from the protection from the inert diagenesis environment influenced by the hydrocarbon invading，and the reservoir with high content of kaolinite layers often correspond to the oil- bearing layer and the high permeability layer． Ｒeservoir influenced by atmospheric water is characterized by feldspar dissolution and kaolinite enrichment，and generally accompany with high porosity． |
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| Keywords: | geological fluids clastic reservoir clay minerals Bohai Sea Paleogene |
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