| 歧口和泌阳凹陷两种类型湖相碳酸盐岩沉积特点 |
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| 引用本文： | 杨有星,高永进,张君峰,周新桂,张金虎,白忠凯,韩淼.歧口和泌阳凹陷两种类型湖相碳酸盐岩沉积特点[J].现代地质,2019,33(4):831-840. |
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| 作者姓名： | 杨有星 高永进 张君峰 周新桂 张金虎 白忠凯 韩淼 |
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| 作者单位： | 中国地质调查局油气资源调查中心,北京 100083 |
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| 基金项目： | 中国地质调查局“全国油气资源战略选区调查与评价”项目(1211302108019);国家科技重大专项(2009ZX05009-002) |
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| 摘 要： | 湖相碳酸盐岩在我国古代和现代各种类型的陆相盆地中非常发育,查明不同类型湖湘碳酸盐岩的沉积模式差异对指导薄层碳酸盐岩油气储层勘探开发具有重要意义,为油气储层分布规律提供依据。根据岩心、测井、地球化学、古生物等资料对歧口和泌阳凹陷湖相碳酸盐岩沉积特征差异和主要控制因素进行了对比分析,研究结果发现:歧口凹陷和泌阳凹陷湖相碳酸盐岩在岩石类型、沉积位置、沉积规模、沉积相类型和沉积旋回特征都存在明显差异,歧口凹陷湖相碳酸盐岩沉积面积大于2 000 km2,分布在凹陷西南缓坡区,具有分布面积广、厚度薄、岩石和沉积相类型多样、沉积旋回变化周期长等特点,泌阳凹陷湖相碳酸盐岩主要分布在凹陷中心部位,具有分布面积小、厚度大、沉积相类型单一、旋回变化周期短的特点。古地貌、水体开放程度和气候条件是歧口和泌阳凹陷沉积模式差异的主要控制因素。盐度、水温、生物群类型以及湖平面变化频率间接受到了古地貌、水体开放程度和气候条件的控制,也是沉积模式差异的因素。
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| 关 键 词： | 歧口凹陷 泌阳凹陷 湖相碳酸盐岩 沉积相模式 主控因素 |
Depositional Models and Differences of Lacustrine Carbonate Rocks:Comparison Between Qikou Sag and Biyang Sag |
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| YANG Youxing,GAO Yongjin,ZHANG Junfeng,ZHOU Xingui,ZHANG Jinhu,BAI Zhongkai,HAN Miao.Depositional Models and Differences of Lacustrine Carbonate Rocks:Comparison Between Qikou Sag and Biyang Sag[J].Geoscience——Journal of Graduate School,China University of Geosciences,2019,33(4):831-840. |
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| Authors: | YANG Youxing GAO Yongjin ZHANG Junfeng ZHOU Xingui ZHANG Jinhu BAI Zhongkai HAN Miao |
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| Institution: | Oil & Gas Survey, China Geology Survey, Beijing 100083, China |
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| Abstract: | Based on core logging and spore and pollen analyses, comparison between the depositional models of the Qikou and Biyang sags was made and the major controlling factors were determined. The results show that the two sags contain clear differences in rock types, locations, scales and facies. The sedimentary area of lacustrine facies is over 2000 km2, which is distributed in the southwestern gentle slope area. It is featured by its large distribution area, small thickness, diverse rock and sedimentary facies and long deposition cycle. Carbonate rocks in the Biyang sag are mainly distributed in the central part of the depression, and are featured by small distribution area, large thickness, single sedimentary facies and short deposition cycle. The ancient landforms, openness of water body and climate conditions are likely the major causes for these differences. Factors such as salinity, temperature, biological groups and lacustrine levels also contributed substantially to these differences. |
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| Keywords: | Qikou sag Biyang sag lacustrine carbonates depositional model controlling factor |
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