塔河油田中下奥陶统岩溶缝洞方解石碳、氧、锶同位素地球化学特征

刘存革; 李国蓉; 朱传玲; 刘国勇; 卢宇峰

塔河油田中下奥陶统岩溶缝洞方解石碳、氧、锶同位素地球化学特征

刘存革^{1, 2, 4,},
李国蓉³,
朱传玲⁴,
刘国勇⁵,
卢宇峰⁴

1.
中国石油大学盆地与油藏研究中心, 北京 102249
2.
教育部石油天然气成藏机理重点实验室, 北京 102249
3.
成都理工大学油气藏地质及开发工程国家重点实验室, 四川成都 610059
4.
中石化西北分公司, 新疆乌鲁木齐 830011
5.
中国石油冀东油田分公司, 河北唐山 063004

基金项目:

国家重点基础研究发展规划“973”项目 2005CB422108

详细信息

作者简介:
刘存革(1976-), 男, 博士研究生, 从事于沉积和储层研究. E-mail: liucunge@163.com

中图分类号: P7368
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出版历程
- 收稿日期: 2007-08-12
- 刊出日期: 2008-05-25

Geochemistry Characteristics of Carbon, Oxygen and Strontium Isotopes of Calcites Filled in Karstic Fissure-Cave in Lower-Middle Ordovician of Tahe Oilfield, Tarim Basin

1.
Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249, China
2.
Key Laboratory for Hydrocarbon Accumulation, Ministry of Education, Beijing 102249, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
4.
Northwest Company of SINOPEC, Urumqi 830011, China
5.
PetroChina Jidong Oilfield Company, Tangshan 063004, China

摘要

摘要: 为了探讨塔河油田中下奥陶统古岩溶产物的地球化学特征以及评价不同期次古岩溶作用的影响区域, 系统分析了中下奥陶统岩溶缝洞方解石的碳、氧、锶同位素.不同产状的方解石碳、氧同位素具有明显的大气水岩溶特征, 早期岩溶产物以富集¹³C和低⁸⁷Sr/⁸⁶Sr比值为特征, 而海西早期岩溶产物以δ¹³C分布较宽和高87Sr/86Sr比值为特征, 两者的δ¹⁸O值分布均较宽.桑塔木组覆盖区比北部地区富集¹³C, 来自围岩的¹³C比重加大, 另一个原因是早期岩溶产物的δ¹³C值较高; 桑塔木组覆盖区岩溶产物具有高⁸⁷Sr/⁸⁶Sr比值特征, 说明有壳源锶的注入, 主要是受海西早期岩溶作用的影响, 并且高⁸⁷Sr/⁸⁶Sr比值特征比北部地区低, 其原因是来源于围岩的重溶锶比重加大.δ¹³C和⁸⁷Sr/⁸⁶Sr在区域上的变化, 结合区域地质背景, 表明海西早期岩溶对北部地区和桑塔木组覆盖区均有重要的影响, 是塔河油田中下奥陶统碳酸盐岩的主岩溶期, 也是其储层的主要形成时期.
- 塔里木盆地 /
- 塔河油田 /
- 中下奥陶统 /
- 古岩溶 /
- 碳氧同位素 /
- 锶同位素
Abstract: For discussing the geochemistry characteristics of paleokarstic products of Lower-Middle Ordovician in Tahe oilfield, and evaluating the areas influenced by different stages of paleokarst, the carbon, oxygen and strontium isotopes of karstic fissure-cave calcites have been systematically analyzed.The carbon and oxygen isotopes of different attitude calcites are characterized by meteoric water karst, and the early paleokarstic products are featured with enriched ¹³C and lower ⁸⁷Sr/⁸⁶Sr ratios.The wide ranges of δ¹³C and high ⁸⁷Sr/⁸⁶Sr ratios are the characteristics of early Herlynian paleokarst, and both have wide ranges of δ¹⁸O.The areas covered with O3s Formation are enriched with more ¹³C than those of north areas, indicating the increased proportion of ¹³C from the host rock.And another reason is the higher δ¹³C of early paleokastic products.Under the influence of the early Herlynian paleokarst, the strontium isotopes of different attitude calcites are heavier than the background values, indicating the join of the terrestrial strontium.The features of heavier strontium in north areas are lower than those of the areas covered with O₃s Formation, indicating the increased proportion of the dissolved strontium from the wall rock.According to the regional variations of carbon, strontium isotopes and geologic background, the early Herlynian paleokarst exerted important impact on the carbonate rocks of the Lower-Middle Ordovician in the north areas and the areas covered with O3s Formation, and it is the main karst episode of Tahe oilfield and also the main formation episode of reservoir.
- Tarim basin /
- Tahe oilfield /
- Lower-Middle Ordovician /
- paleokarst /
- carbon and oxygen isotopes /
- strontium isotope

HTML全文

图 1 北部地区方解石胶结物δ¹³C-δ¹⁸O关系

Fig. 1. The δ¹³C-δ¹⁸O plot of calcite cements in the north areas

下载: 全尺寸图片幻灯片

图 2 北部地区方解石胶结物⁸⁷Sr/⁸⁶Sr-δ¹³C和⁸⁷Sr/⁸⁶Sr-δ¹⁸O关系(图例同图 1)

Fig. 2. The⁸⁷Sr/⁸⁶Sr-δ¹³C plot and⁸⁷Sr/⁸⁶Sr-δ¹⁸O plot of calcite cements in the north areas

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图 3 桑塔木覆盖区方解石胶结物δ¹³C-δ¹⁸O关系(图例同图 1)

Fig. 3. The δ¹³C-δ¹⁸O plot of calcite cements in the areas covered with O₃s Formation

下载: 全尺寸图片幻灯片

图 4 桑塔木组覆盖区方解石胶结物⁸⁷Sr/⁸⁶Sr-δ¹³C和⁸⁷Sr/⁸⁶Sr-δ¹⁸O关系(图例同图 1)

Fig. 4. The⁸⁷Sr/⁸⁶Sr-δ¹³C plot and⁸⁷Sr/⁸⁶Sr-δ¹⁸O plot of calcite cements in the areas covered with O₃s Formation

下载: 全尺寸图片幻灯片

表 1 北部地区岩溶缝洞方解石和微晶灰岩碳、氧、锶同位素组成

Table 1. The carbon, oxygen and strontium isotopic compositions of calcites filled in fissure-cave and micrite in the north areas

表 2 桑塔木组覆盖区岩溶缝洞方解石胶结物碳、氧、锶同位素组成

Table 2. The carbon, oxygen and strontium isotopic compositions of calcites filled in fissure-cave in the areas covered with O₃s Formation

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