| 塔里木盆地塔中西部地区奥陶系岩溶
作用及对油气储层的制约 |
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| 引用本文：何碧竹,焦存礼,贾斌峰,汪功怀.2009.塔里木盆地塔中西部地区奥陶系岩溶
作用及对油气储层的制约[J].地球学报,30(3):395-403. |
| DOI：10.3975/cagsb.2009.03.14 |
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| 基金项目:中国石化集团公司科技部项目(编号P04027)及中国石化海相前瞻性项目(编号YPH08110) |
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| 中文摘要:塔中西部地区下奥陶统—上奥陶统良里塔格组, 发育了巨厚的、多种岩性的海相碳酸盐岩地层。根据对该区钻井岩芯、测井和地质化验分析资料综合研究结果, 奥陶系存在同生岩溶、风化壳岩溶、埋藏岩溶等三种不同的岩溶作用类型。同生岩溶沿上奥陶统良里塔格组台地边缘相带分布, 大气成岩透镜体发育频繁, 但规模较小；风化壳岩溶主要分布于中奥陶世中1低隆起及塔中Ⅱ号构造带；埋藏岩溶主要存在3期, 在断裂构造带及火成岩区较为发育。岩相和沉积相、岩溶作用、构造裂缝等是奥陶系岩溶储层发育的主要控制因素, 制约了不同层段、不同部位岩溶储层发育。 |
| 中文关键词:岩溶作用 主控因素 奥陶系 塔中西部 |
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| Karstification of Ordovician Strata in Western Tazhong Area of Tarim Basin, Xijiang |
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| Abstract:There exist thick marine carbonate strata of varied lithologic characters in the Lower Ordovician-Upper Ordovician Lianglitage Formation of western Tazhong area. Based on data of drill cores, logs and laboratory tests, the authors recognized three types of karstifications in the study area, namely syn-depositional, weathering-crust, and buried ones. The syn-depositional karstification occurs mainly on the platform margin of Later Ordovician Lianglitage Formation, in which atmospheric lithogenic lens are frequently seen but their sizes are not so big. The weathering-crust karstification is developed in central Kartarke uplift. The buried karstification can be divided into three stages and are distributed in areas where faulted structural belts and igneous rocks are well developed. Lithofacies and sedimentary facies, karstification and structural fissures are main factors controlling the develop-ment of Ordovician carbonate reservoirs, which constrain the development of karst reservoir rocks in different layers and positions. |
| keywords:karstification main controlling factors Ordovician western Tazhong area |
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