| 郯庐断裂中段两侧坳陷的新生代构造－热演化特征 |
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| 引用本文： | 邱楠生,苏向光,李兆影,张杰,柳忠泉,李政,张林晔.郯庐断裂中段两侧坳陷的新生代构造－热演化特征[J].地球物理学报,2007,50(5):1497-1507. |
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| 作者姓名： | 邱楠生 苏向光 李兆影 张杰 柳忠泉 李政 张林晔 |
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| 作者单位： | 1.中国石油大学(北京)油气资源与探测国家重点实验室，北京 102249;2.中国石油大学(北京)盆地与油藏研究中心，北京 102249;3.中石化胜利油田有限公司地质研究院，东营 257062 |
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| 基金项目： | 教育部新世纪优秀人才支持计划项目(NCET-05-0109)，国家“973”项目(2005CB422102)，中国石油化工股份有限公司“十五”重点项目(P03007)，教育部创新团队(IRT0658)联合资助 |
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| 摘 要： | 郯庐断裂带两侧分布众多的坳陷，其构造－热演化历史对于这些含油气坳陷的油气成藏起到重要的作用.本文利用镜质组反射率和磷灰石裂变径迹古温标模拟计算了郯庐断裂带中段两侧6个坳陷120口单井的热演化历史，在此基础上得到各坳陷新生代的地温梯度演化特征.总体上，郯庐断裂两侧坳陷的古地温梯度在新生代是逐渐降低的，在古近纪较高而新近纪仅比目前的地温梯度略高；结合构造沉降史的恢复结果，认为其反映了研究区由断陷向坳陷转化的构造演化特征.根据各坳陷古地温梯度的演化模拟结果，距离郯庐断裂带不同位置的坳陷其古热场特征存在差异.位于断裂带内的辽河盆地、渤中和昌潍坳陷古热场较高(第三纪初期的地温梯度达到57～59 ℃/km)，且辽河盆地和昌潍坳陷在第三纪地温梯度一直处于较高的状况，而渤中坳陷新近纪时期的较低地温梯度是由于其大的构造沉降所致.远离郯庐断裂带的冀中和临清坳陷的古热场及其演化程度均是较低的，第三纪初期的地温梯度分别为53 ℃/km和50 ℃/km.由此推测郯庐断裂带在第三纪以来的活动性对其两侧地区热场的影响较大.郯庐断裂带两侧坳陷地温场的差异在宏观上受控于郯庐断裂的演化，在局部地区受控坳(盆)断裂等构造的影响.
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| 关 键 词： | 郯庐断裂带 构造－热演化 镜质组反射率 磷灰石裂变径迹 |
| 文章编号： | 0001-5733（2007）05-1497-11 |
| 收稿时间： | 2007-1-5 |
| 修稿时间： | 2007-01-05 |
The Cenozoic tectono-thermal evolution of depressions along both sides of mid-segment of Tancheng-Lujiang Fault Zone, East China |
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| QIU Nan-Sheng,SU Xiang-Guang,LI Zhao-Ying,ZHANG Jie,LIU Zhong-Quan,LI Zheng,ZHANG Lin-Ye.The Cenozoic tectono-thermal evolution of depressions along both sides of mid-segment of Tancheng-Lujiang Fault Zone, East China[J].Chinese Journal of Geophysics,2007,50(5):1497-1507. |
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| Authors: | QIU Nan-Sheng SU Xiang-Guang LI Zhao-Ying ZHANG Jie LIU Zhong-Quan LI Zheng ZHANG Lin-Ye |
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| Institution: | 1.State Key Laboratory of Petroleum Resource and Prospecting，China niversity of Petroleum，Beijing 102249，China;2.Research Center for Basin and Reservoir，China University of Petroleum，Beijing 102249，China;3.Institute of Geological Research，Shengli Oil Company Ltd.，SINOPEC，Dongying 257062，China |
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| Abstract: | There are many depressions along the both sides of the Tancheng-Lujiang (Tanlu) Fault zone，and their tectono-thermal evolution histories played an important role in the hydrocarbon generation and accumulation within the depressions. The thermal gradient evolution histories of 120 wells during the Cenozoic time in six depressions，which located along the middle part of Tancheng-Lujiang Fault Zone，were modeled by using the vitrinite reflectance and apatite fission track data in this paper. Based on these modeling results，the characteristics of thermal evolution of the Jiyang，Changwei，Linqing，Jizhong，Bozhong and Huanghua depression were analyzed. Generally，the thermal gradients of the different depressions decreased during the Cenozoic time. There had higher thermal gradients at Paleogene，but it only a little higher at Neogene than that of present day's. The modeling results of thermal history and the tectonic subsidence history reconstruction fits well with the evolution stages of rift-subsidence basin to down-warped basin. The thermal gradients are different in six depressions and decreases with the increasing distance to the Tanlu fault zone. There have higher thermal gradients in the depressions within the Tanlu Fault zone，such as Liaohe basin，Bozhong and Changwei depression，with the gradient up to 57～59℃/km at the early Paleogene，and it maintained a higher level during the whole Cenozoic time in Changwei depression and Liaohe basin. The relative lower gradient in the ozhong depression was resulted from large amount of tectonic subsidence during the Neogene. However，the thermal gradients and their evolution in the Jizhong and Linqing depression，which far away from Tanlu Fault zone，was lower with 53℃/km and 50℃/km respectively at the early Paleogene. The above results show that the activity of Tanlu Fault zone at Cenozoic played an important role in the thermal fields of these depressions. The different thermal fields of the depressions along the both sides of mid-segment of the Tanlu Fault zone were macrocontrolled by the evolution of Tanlu Fault and partly controlled by the depression-controlling faults at the same time. |
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| Keywords: | Tancheng-Lujiang Fault Zone Tectono-thermal evolution Vitrinite reflectance Apatite fission track |
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