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引用本文:倪新锋1,2 张丽娟1 沈安江2 潘文庆1 乔占峰2. 塔北地区奥陶系碳酸盐岩古岩溶类型、期次及叠合关系[J]. 中国地质, 2009, 36(6): 1312-1321.
NI Xin-feng1,2, ZHANG Li-juan1, SHEN An-jiang2, PANG Wen-qing1, QIAO Zhan-feng2. Paleo-karstification types, karstification periods and superimposition relationship of Ordovician carbonates in northern Tarim Basin[J]. Geology in China, 2009, 36(6): 1312-1321(in Chinese with English abstract).
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塔北地区奥陶系碳酸盐岩古岩溶类型、期次及叠合关系
倪新锋1,2 张丽娟1 沈安江2 潘文庆1 乔占峰21,2
1.中国石油塔里木油田分公司,新疆 库尔勒 841000;2.中国石油杭州地质研究院,浙江 杭州 310023
摘要:
提要:古岩溶作用是塔里木盆地北部地区奥陶系海相碳酸盐岩储层形成的关键要素之一。本文以岩石学、地球物理资料及测试分析资料为基础,将塔北地区奥陶系碳酸盐岩古岩溶划分为准同生岩溶、埋藏岩溶、风化壳岩溶三大类及若干亚类。准同生岩溶作用控制早期碳酸盐岩储层的形成与分布,埋藏岩溶作用一般沿原有的孔缝系统进行,是碳酸盐岩储层优化改造的关键因素之一,风化壳岩溶作用是奥陶系碳酸盐岩储层形成的关键作用。塔里木叠合盆地的多旋回构造演化特点,形成了塔北奥陶纪不同阶段、不同类型碳酸盐岩6期古岩溶作用的叠加、改造关系,其中对于塔北地区奥陶系古岩溶储层起重要作用的为早加里东期Ⅱ幕,加里东中期Ⅰ幕、Ⅱ幕和海西早期。塔北地区奥陶系各类岩溶具有复杂而显著的叠合关系,准同生期岩溶为后期的埋藏岩溶提供了成岩介质通道,随后发育的埋藏及风化壳岩溶则是继承并叠加早期准同生岩溶通道的发育,最终成为潜在的优质储层。
关键词:  准同生岩溶  埋藏岩溶  风化壳岩溶  岩溶期次  叠合关系  塔北地区  奥陶系
DOI:
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基金项目:国家科技重大专项“大型油气田及煤层气开发”(2008ZX05004-002)及塔里木油田公司2008年度博士后项目资助。
Paleo-karstification types, karstification periods and superimposition relationship of Ordovician carbonates in northern Tarim Basin
NI Xin-feng1,2, ZHANG Li-juan1, SHEN An-jiang2, PANG Wen-qing1, QIAO Zhan-feng21,2
1. Tarim Oilfield, PetroChina, Korla 841000, Xinjiang, China;2. Hangzhou Institute of Geology, PetroChina, Hangzhou 310023, Zhejiang, China
Abstract:
Abstract:Karstification is one of the most important elements for the formation of Ordovician marine carbonate reservoirs in northern Tarim Basin. Based on lithology, geophysical data and test data, the authors divided karstification of northern Tarim Basin into three types (penecontemporaneous karstification, buried karstification, weathering karstification) and some subtypes. The penecontemporaneous karstification controls the formation and distribution of the early carbonate rock reservoirs, the buried karstification is always developed along the former pore-fracture systems, and constitutes one of the most key factors for reservoir optimization, and the weathering karstification is the key factor for the formation of Ordovician carbonate reservoirs. As for the characteristics of polycyclic structure evolution of northern Tarim Basin, there exist six periods of paleo-karstification in different superimposing and rebuilding stages and various Ordovician carbonate rocks, of which the most important periods for reservoir karstification are the early Caledonian II episode, the middle Caledonian I and II episode, and the early Hercynian. Different types of karstification in northern Tarim Basin have complex and pronounced superimposition relationship: the penecontemporaneous karstification provided basic pathway for the buried karstification; the subsequent buried karstification and weathering karstification were developed on the basis of succeeding to and superimposing on the former penecontemporaneous karstification and finally became the excellent potential reservoir.
Key words:  penecontemporaneous karstification  buried karstification  weathering karstification  karstification period  superimposition relationship  northern Tarim Basin  Ordovician