| 松辽盆地徐家围子断陷边界断裂生长过程的定量
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| 引用本文： | 张军龙,蒙启安,张长厚,高战武.松辽盆地徐家围子断陷边界断裂生长过程的定量
分析[J].地学前缘,2009,16(4):87-96. |
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| 作者姓名： | 张军龙 蒙启安 张长厚 高战武 |
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| 作者单位： | 1中国地震局 地震预测研究所, 北京 100036
2大庆油田有限责任公司 勘探开发研究院, 黑龙江 大庆 163712
3中国地质大学(北京) 地球科学与资源学院, 北京 100083 |
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| 基金项目： | 国家自然科学基金项目(40672150);国家科技支撑项目(2006BACBB01 0203);地震科学联合基金课题“华北克拉通东北部地震构造动力环境研究”;地震预测研究所基本科研业务专项(02076902 07) |
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| 摘 要： | 徐家围子断陷位于松辽盆地中部,受徐西和宋西两条边界断裂控制。基于地震反射剖面地质解译成果,应用断层沿走向位移 长度曲线形态分析方法和沿倾向生长速率分析方法,对两条断裂的生长演化过程进行了初步的研究。结果表明,沙河子期(136~144 Ma)为最主要的生长期,徐西断层的平均生长速率为35 m/Ma, 宋西断层的平均生长速率为71 m/Ma,断陷边界断裂总体平均生长速率大于60 m/Ma,两条断层主要呈现独立生长状态,只在重叠的部位发生微弱的软连接;营城期(126~136 Ma)也是主要的生长期,徐西断层的平均生长速率为18 m/Ma,宋西断层的平均生长速率为85 m/Ma,二者发生硬连接,并基本结束了硬连接过程,以重叠处宋西断层的强烈活动为特征,断陷盆地的规模逐渐扩大,沉积厚度随之增加;营城期后断层只在局部连接地点发生微弱活动。断层生长过程中伴生构造的位置基本与油气田的分布相吻合,对它的深入研究将有助于油气勘探。
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| 关 键 词： | 徐家围子断陷 断裂连接 生长速率 定量 演化 |
A quantitative study on the growth of boundary faults of the Xujiaweizi faulting depression in the Songliao Basin. |
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| ZHANG Jun-Long MENG Qi-An ZHANG Chang-Hou GAO Zhan-Wu.A quantitative study on the growth of boundary faults of the Xujiaweizi faulting depression in the Songliao Basin.[J].Earth Science Frontiers,2009,16(4):87-96. |
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| Authors: | ZHANG Jun-Long MENG Qi-An ZHANG Chang-Hou GAO Zhan-Wu |
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| Institution: | 1Insititute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
2Research Institute of Exploration and Development, Daqing Oilfield Company Ltd., PetroChina, Daqing 163712, China;
3School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | The Xujiaweizi faulting depression lies in the central part of the Songliao Basin. It is controlled by Songxi and Xuxi faults. Based on the geologic interpretations of the seismic reflection data，we have investigated the growth rate and the evolution of the master faults forming basin boundaries by applying the method of analyzing the relationship of displacement length along strike of normal faults and the approaches for analyzing growth rate along dip direction. It is revealed that the faults formed mainly in the Shahezi Period. The average growth rate of fault is estimated to be 35 m/Ma and 71 m/Ma for Xuxi and Songxi respectively and larger than 60 m/Ma for the boundary fault system as a whole. During the Shahezi Period, Songxi and Xuxi faults were developed independently with a little soft link around their overlapping part. The Yingcheng Period was another important stage with much more intensive activities of Songxi fault, leading to a larger and deeper faulting depression with thicker sediments infilling. The average growth rate of fault was 18 m/Ma for Xuxi, and 85 m/Ma for Songxi. Hard link occurred between them. Only weak and local faulting activity occurred around some linking areas after the Yingcheng Period. The oil and gas fields are mainly located in the areas where secondary tectonic element developed. This finding bears important implications for the further oil and gas exploration in Xujiaweizi Area. |
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| Keywords: | Key words: Xujiaweizi faulting depression fault linkage growth rate quantitative development |
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