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| 川东北普光气田下三叠统飞仙关组白云岩成因——来自岩石结构与Sr同位素和Sr含量的证据 | |
| 引用本文： | 郑荣才,文华国,郑超,罗平,李国军,陈守春.川东北普光气田下三叠统飞仙关组白云岩成因——来自岩石结构与Sr同位素和Sr含量的证据[J].岩石学报,2009,25(10):2459-2468. |
| 作者姓名： | 郑荣才 文华国 郑超 罗平 李国军 陈守春 |
| 作者单位： | 1. 成都理工大学"油气藏地质及开发工程"国家重点实验室,成都,610059 2. 中国石油西南油气田分公司重庆气矿,重庆,400021 3. 中国石油勘探开发研究院油气储层重点验实室,北京,100083 |
| 基金项目： | 中国石油天然气总公司科技信息部重点实验室2002年项目"川东北三叠系飞仙关组鲕滩白云岩储层形成机理与分布特征研究"部分研究成果 |
| 摘 要： | 研究了川东北普光气田下三叠统飞仙关组白云岩储层的岩石结构Sr的含量和Sr同位素组成,讨论了它的成因,飞仙关组优质储层为成岩期埋藏交代白云化作用的产物,来自岩石结构和Sr同位素和Sr含量的证据包括如下几个方面:(1)与准同生白云岩比较,埋藏白云岩的岩石结构和Sr同位素和Sr含量地球化学特征与前者有显著差别;(2)飞仙关组所有各类碳酸盐岩(或矿物)具有早三叠世海水Sr同位素组成特征,~(87)Sr/~(86)Sr比值变化范围为0.706588～0.708187,覆盖了全球早三叠世海水Sr同位素的变化范围(0.7076～0.7078),平均值0.707656与全球早三叠世平均值(0.707743)基本一致;(3)埋藏白云岩~(87)Sr/86Sr比值变化范围为0.707122～0.707419,平均值0.707421,都略低于全球早三叠世海水Sr同位素变化范围和平均值,但与已报道的川东北早三叠世飞仙关期海水Sr同位素变化范围(0.707330～0.707383)和平均值(0.707350)都非常接近,说明白云石化流体具有强烈的川东北地区早三叠世飞仙关期海水Sr同位素组成特征;(4)综合岩石结构、Sr同位素和Sr含量地球化学特征,证明飞仙关组白云岩储层为成岩期埋藏交代作用产物,白云石化流体来自地层中高Sr和高盐度的海源地层水. |
| 关 键 词： | 川东北 飞仙关组 白云岩储层 Sr含量 Sr同位素 |
| 收稿时间： | 2009/2/20 0:00:00 |
| 修稿时间： | 6/3/2009 12:00:00 AM |
Genesis of Dolostone of the Feixianguan Formation, Lower Triassic in the NE Sichuan Basin: Evidences from Rock Structure and Strontium Content and Isotopic Composition |
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| ZHENG RongCai,WEN HuaGuo,ZHENG Chao,LUO Ping,LI GuoJun and CHEN ShouChun.Genesis of Dolostone of the Feixianguan Formation, Lower Triassic in the NE Sichuan Basin: Evidences from Rock Structure and Strontium Content and Isotopic Composition[J].Acta Petrologica Sinica,2009,25(10):2459-2468. | |
| Authors: | ZHENG RongCai WEN HuaGuo ZHENG Chao LUO Ping LI GuoJun and CHEN ShouChun |
| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;Chongqing Gas District of Southwest Oil and Gas Company of CNPC, Chongqing 400021, China;Key Laboratory of Oil and Gas Reservoir of CNPC, Beijing 100083, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;Chongqing Gas District of Southwest Oil and Gas Company of CNPC, Chongqing 400021, China |
| Abstract: | On the basis of analysis of rock structure and strontium isotopes composition and content,in this study the genesis of dolostone reservoir in the Feixianguan Formation,Lower Triassic of the NE Sichuan Basin is discussed. Results indicate that the dolostone reservoir is the product of replaced dolomitization during the deep burial diagenesis period. This conclusion comes from following evidences: (1) rock structure and characteristics of strontium isotope and strontium content of the deep burial dolostone are quite different from that of penecontemporaneous dolostone. (2) carbonate rocks and minerals of the Feixianguan Formation have the composition characteristics of Triassic seawater strontium isotope, and their 87Sr/86Sr ratios range from 0.706588 to 0.708187,covering the range (0.7076~0.7078) of strontium isotope in early Triassic and the average value 0.707656 being consistent with the average value of 0.707743 for global early Triassic. (3) 87Sr/86Sr ratios of burial dolostone range from 0.707122 to 707419,being slightly under the changing range of strontium isotope of the global early Triassic seawater,but within the range of 0.707330~0.707383 for early Triassic seawater of northeast Sichuan Basin suggested in earlier studies,and the average value 0.707421 is closer to the earlier reported value 0.707350 than global early Triassic seawater,which shows that dolostone diagenetic fluids were very similar to the Triassic seawater. (4) Based on comprehensive study of rock structure,geochemistry characteristics of strontium isotope and strontium content,it can be well proved that the dolostone diagenetic fluids come from sea source water rich in strontium and salinity sealed up and kept in the stratum. |
| Keywords: | Northeast Sichuan Basin Feixianguan Formation Dolostone reservoir Strontium content Strontium isotope |
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