| 黑龙江东部林口地区下白垩统穆棱组
砾岩的成因及其意义 |
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| 引用本文： | 张云鹏,任建业,赵学钦,汤 艳,王 珊,杨承志.黑龙江东部林口地区下白垩统穆棱组
砾岩的成因及其意义[J].地质通报,2012,31(10):1731-1738. |
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| 作者姓名： | 张云鹏 任建业 赵学钦 汤 艳 王 珊 杨承志 |
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| 作者单位： | 1. 中国地质调查局西安地质调查中心，陕西 西安 710054；
2. 中国地质大学(武汉)资源学院，湖北 武汉 430074；
3. 西南科技大学环境与资源学院，四川 绵阳 621010；
4. 长安大学地球科学与资源学院，陕西 西安 710054；
5. 中国石油勘探开发研究院，北京 100083 |
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| 摘 要： | 大三江地区是中国东部重要的油气资源接替区，早白垩世时期该地区曾为一个统一的盆地，之后盆地遭受破坏分解。如何确定当时的盆地边界进而恢复盆地原型，是该地区亟待解决的关键地质问题之一。前人对盆地边界的确定大都以理论推测为主，缺乏实际证据。本次工作在黑龙江林口地区发现一套穆棱组底部砾岩，对砾石进行成分及分选特征、沉积特征等的统计与分析，结合古水流恢复和地震解释资料，认为该套砾岩整体为冲积扇相，以河道砾岩沉积和漫流砾岩沉积为主，物源主要来自盆地西部的张广才岭。结合地震资料分析，认为研究区穆棱组时期的沉积模型为冲积扇相向滨浅湖亚相的直接过渡。本研究不仅为大三江盆地西部边界的确定提供了直接证据，同时也为该地区今后的油气勘探指明了方向。
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| 关 键 词： | 黑龙江大三江地区 砾岩成因 沉积模型 边缘相 盆地边界 |
Genesis and significance of conglomerate in Lower Cretaceous Muling Formation of Linkou area, Heilongjiang Province |
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| ZHANG Yun-peng,REN Jian-ye,ZHAO Xue-qin,TANG Yan,WANG Shan,YANG Cheng-zhi.Genesis and significance of conglomerate in Lower Cretaceous Muling Formation of Linkou area, Heilongjiang Province[J].Geologcal Bulletin OF China,2012,31(10):1731-1738. |
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| Authors: | ZHANG Yun-peng REN Jian-ye ZHAO Xue-qin TANG Yan WANG Shan YANG Cheng-zhi |
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| Abstract: | Great Sanjiang region is an important oil and gas resources succeeding district in eastern China. During the Early Cretaceous period, this region was once a unified lake basin, and then broken up. The problem as to the determination of the basin boundary and the reconstruction of the basin prototype is one of the key geological problems in this region. Previous study on the basin boundary was mainly focused on theoretical speculation and seemed lack of actual evidence. In this study, a set of conglomerates was found at the bottom of Muling Formation in Linkou basin. Based on an analysis of gravel composition and sorting as well as sedimentary characteristics, combined with the paleocurrent recovery and seismic data interpretation, the authors have concluded that the set of conglomerate is on the whole of alluvial fan facies, the river conglomerate deposition and overflow conglomerate deposition constitute the domi
nant depositions, and the provenance mainly came from the Zhangguangcai Mountain in the west of the basin. Combined with the seismic data analysis, it is held that the deposition model of the study area was the direct transition from the alluvial fan to the shallow lake subfacies in the period of Muling Formation. This study not only provides direct evidence for the determination of the western border of the Great Sanjiang Basin, but also points out the direction for the future oil and gas exploration in this region. |
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