塔里木盆地中部航磁异常带新解译
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摘要
横亘于塔里木盆地中部的纬向航磁高ΔTa异常带,一直是探讨盆地及深部基底的物质组成及结构构造的焦点。根据钻井及地震资料综合分析,发现满加尔坳陷中南部上奥陶统内发育大型地震反射异常体,平面上主要由8个地震反射异常体近东西向呈带状展布,与盆地中部航磁高ΔTa异常带相关。从地层发育及地震相特征分析,这些地震反射异常体应为辉绿岩-玄武岩等基性火成岩体,且与航磁ΔTa异常带上的磁力高相对应。异常体具有垂直向下的通道,与断裂及岩浆活动通道有关。盆地中部高航磁异常带为多期构造易活动带,反映了满加尔坳陷震旦纪与中晚奥陶世处于拉张的构造背景。
The ΔTa high aeromagnetic anomaly zone lying in the central part of Tarim Basin has been a focus in discussing the composition and structure of Tarim basin and its basement.Based on a comprehensive analysis of borehole and seismic data,the authors have found that there exist large-scale seismic reflection anomaly bodies in Middle-Upper Ordovician strata of Manjiaer depression,which are related closely to the Central High Aeromagnetic Anomalies Zone(CHAAZ) and constituted mainly by eight nearly EW-trending seismic reflection anomaly bodies.The stratigraphic and seismic facies analysis shows that these seismic anomaly bodies should be igneous rocks.The anomaly bodies have vertical downward channels in seismic profiles,which are related to faults and magmatic activity channels.The CHAAZ of the basin is a product of multi episodes tectonic activities,suggesting the development of Manjiaer depression in an extensional tectonic setting in Sinian and Late Ordovician.
The ΔTa high aeromagnetic anomaly zone lying in the central part of Tarim Basin has been a focus in discussing the composition and structure of Tarim basin and its basement.Based on a comprehensive analysis of borehole and seismic data,the authors have found that there exist large-scale seismic reflection anomaly bodies in Middle-Upper Ordovician strata of Manjiaer depression,which are related closely to the Central High Aeromagnetic Anomalies Zone(CHAAZ) and constituted mainly by eight nearly EW-trending seismic reflection anomaly bodies.The stratigraphic and seismic facies analysis shows that these seismic anomaly bodies should be igneous rocks.The anomaly bodies have vertical downward channels in seismic profiles,which are related to faults and magmatic activity channels.The CHAAZ of the basin is a product of multi episodes tectonic activities,suggesting the development of Manjiaer depression in an extensional tectonic setting in Sinian and Late Ordovician.
引文
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[2]许炳如.根据航磁解释的塔里木盆地基岩分布[J].西安石油学院学报,1997,12(6):8-11.Xu Bingru.Basement Rock Distribution in Talimu Basin Inferredfrom Aeromagnetic Data[J].Journal of Xi’an Petroleum Institute,1997,12(6):8-11(in Chinese with English abstract).
[3]张家声,李燕,黄雄南.中国北部古元古代地壳尺度的伸展拆离和硅铝壳内活动带:北东向线性航磁异常的地质构造解释[J].地质科学,2007,42(2):267-302.Zhang Jiasheng,Li Yan,Huang Xiongnan.Paleoproterozoic crust-scale transtensional shear,detachment and insialic mobile belts innorth China:geologic and tectonic implications for the NE-Striking linear aeromagnetic anomaly[J].Chinese Journal ofGeology,2007,42(2):267-302(in Chinese with English abstract).
[4]贾承造,魏国齐,姚慧君,等.塔里木盆地油气勘探丛书——盆地构造演化与区域构造地质[M].北京:石油工业出版社,1995:1-70.Jia Chengzao,Wei Guoqi,Yao Huijun,et al.Oil and GasExploration Books in Tarim Basin——Tectonic Evolution andRegional Structural Geology[M].Beijing:Petroleum Industry Press,1995:1-70(in Chinese with English abstract).
[5]贾承造,孙德龙,周新源,等.塔里木盆地石油地质与勘探丛书——塔里木盆地板块构造与大陆动力学[M].北京:石油工业出版社,2004:1-202.Jia Chengzao,Sun Delong,Zhou Xinyuan,et al.PetroleumGeology and Exploration Books in Tarim Basin——Plate Tectonicand Continental Dynamics[M].Beijing:Petroleum Industry Press,2004:1-202(in Chinese with English abstract).
[6]崔军文,唐哲民.塔里木盆地构造格架和构造应力场分析[J].岩石学报,2011,27(1):231-242.Cui Junwen,Tang Zhemin.Tectonic framework of the Tarim basinand its tectonic stress field analysis[J].Acta Petrologica Sinica,2011,27(1):231-242(in Chinese with English abstract).
[7]王宜昌,杨辉,王小牧,等.塔克拉玛干前震旦纪古裂谷及其含油气远景[J].新疆石油地质,1994,15(3):191-200.Wang Yichang,Yang Hui,Wang Xiaomu,et al.TakelamakanPre-Sinian platerift and its Petroleum potential[J].XinjiangPetroleum Geology,1994,15(3):191-200.
[8]郭召杰,张志诚,贾承造,等.塔里木克拉通前寒武纪基底构造格架[J].中国科学(D辑),2000,30(6):568-575.Guo Zhaojie,Zhang Zhicheng,Jia Chengzao,et al.Tectonicframework of pre-Cambrian basement in craton of Tarim Baisn[J],Science in China(Series D),2000,30(6):568-575(in Chinese).
[9]郭召杰,张志诚,王建君.阿尔金北缘蛇绿岩带的Sm-Nd等时线年龄及其大地构造意义[J].科学通报,1998,43(18):1981-1984.Guo Zhaojie,Zhang Zhicheng,Wang Jianjun.Sm-Nd isochronage of ophiolite along northern margin of Altun Tagh Mountainsand its tectonic significance[J].Chinese Sci.Bull.,1998,44(5):456-458(in Chinese).
[10]吴根耀,李曰俊,王国林,等.新疆西部巴楚地区晋宁期的洋岛火山岩[J].现代地质,2006,20(3):361-369.Wu Genyao,Li Yuejun,Wang Guolin,et al.Volcanic rocks ofJinningian oceanic islands in the Bachu area,western Xinjiang[J].Geoscience,2006,20(3):361-369(in Chinese with English abstract).
[11]李曰俊,贾承造,胡世玲,等.塔里木盆地瓦基里塔格辉长岩40Ar-39Ar年龄及其意义[J].岩石学报,1999,15(4):594-599.Li Yuejun,Jia Chengzao,Hu Shiling,et al.The 40Ar-39Ar isotopicage of Wajilitag gabbro in Tarim basin and its geologicalsignificance[J].Acta Petrologica Sinica,1999,15(4):594-599(inChinese with English abstract).
[12]李曰俊,孙龙德,胡世玲,等.塔里木盆地塔参1井底部花岗闪长岩的40Ar-39Ar年代学研究[J].岩石学报,2003,19(3):530-536.Li Yuejun,Sun Longde,Hu Shiling,et al.40Ar-39Ar geochronologyof the granite and diorite revealed at the bottom of Tacan 1,thedeepest well in China[J].Acta Petrologica Sinica,2003,19(3):530-536(in Chinese with English abstract).
[13]张家声,劳秋元,李燕.航磁异常的构造解释和华北—塔南—扬子超陆块演化[J].地学前缘,1999,6(4):379-390.Zhang Jiasheng,Lao Qiuyuan,Li Yan.Tectonic implication ofaeromagnetic anomaly and evolution of Huabei-South Tarim-Yangtze superlandmass[J].Earth Science Frontiers,1999,6(4):379-390(in Chinese with English abstract).
[14]丁道桂,汤良杰,等.塔里木盆地形成与演化[M].南京:河海大学出版社,1996:1-302.Ding Daogui,Tang Liangjie,et al.Formation and Evolution ofTarim basin[M].Nanjing:Hehai University Publishing House,1996:1-302.
[15]李曰俊,吴根耀,孟庆龙,等.塔里木盆地中央地区的断裂系统:几何学、运动学和动力学背景[J].地质科学,2008,43(1):82-118.Li Yuejun,Wu Genyao,Meng Qinglong,et al.Fault systems incentral area of the Tarim Basin:geometry,kinematics and dynamicsettings[J].Chinese Journal of Geology,2008,43(1):82-118(inChinese).
[16]陈景山,王振宇,代宗仰,等.塔中地区中上奥陶统台地镶边体系分析[J].古地理学报,1999,1(2):8-17Chen Jingshan,Wang Zhenyu,Dai Zongyang,et al.Study of themiddle and Upper Ordovician rimmed carbonate plateform systemin the Tazhong area,Tarim basin[J].Journal of Palaeogeography,1999,1(2):8-17(in Chinese with English abstract).
[17]顾家裕,张兴阳,罗平,等.塔里木盆地奥陶系台地边缘生物礁、滩发育特征[J].石油与天然气地质,2005,26(3):277-283.Gu Jiayu,Zhang Xingyang,Luo Ping,et al.Developmentcharacteristics of organic reef-bank complex on Ordoviciancarbonate platform margin in Tarim Basin[J].Oil&Gas Geology,2005,26(3):277-283(in Chinese with English abstract).
[18]樊太亮,高志前,刘聪,等.塔里木盆地古生界不同成因斜坡带特征与油气成藏组合[J].地学前缘,2008,15(2):127-136.Fan Tailiang,Gao Zhiqian,Liu Cong,et al.The characteristics ofPalaeozoic slopes with different geneses and oil/gas plays in theTarim basin[J].Earth Science Frontiers,2008,15(2):127-136(inChinese with English abstract).
[19]何碧竹,焦存礼,王生朗,等.塔里木盆地塔中地区上奥陶统近环带状台地边缘相带特征及勘探前景[J].地质学报,2009,83(7):1039-1046.He Bizhu,Jiao Cunli,Wang Shenglang,et al.Characteristics andexploration prospect of carbonate platform margin of LateOrdovician Lianglitage Formation in the Tazhong Area,TarimBasin[J].Acta Geologica Sinica,2009,83(7):1039-1046(in Chinesewith English abstract).
[20]何碧竹,乔秀夫,许志琴,等.塔里木盆地满加尔坳陷及周缘晚奥陶世古地震记录及其地质意义[J].地质学报,2010,84(12):1805-1816.He Bizhu,Qiao Xiufu,Xu Zhiqin,et al.Late Ordovician paleo-seismic records of the Manjiaer Depression and adjacent areas inTarim Basin,Xinjiang,and its geologic significance[J].ActaGeologica Sinica,2010,84(12):1805-1816(in Chinese withEnglish abstract).
[21]李洪辉,周东延,丛祝安.塔里木分盆地地震反射异常体及其地质属性初探[J].石油勘探与开发,2001,28(2):50-52.Li Honghui,Zhou Dongyan,Cong Zhuan.Pilot study on seismicanomaly body and its geological characteristics in Tarim basin[J].Petroleum Exploration and Development,2001,28(2):50-52(inChinese with English abstract).
[22]Ma Yubo,Wu Shiguo,Lv Fuliang,et al.Seismic characteristics anddevelopment of the Xisha carbonate platforms,northern margin ofthe South China Sea[J].Journal of Asian Earth Sciences,2011,40:770-783.
[23]赵宗举,潘懋,杨海军,等.塔里木盆地中-上奥陶统浊积岩物源分析及大地构造意义[J].地质科学,2010,2010,45(3):681-697.Zhao Zhongju,Pan Mao,Yang Haijun,et al.The source rock ofturbidites of Middle-Upper Ordovician in Tarim Basin and itstectonic significance[J].Chinese Journal of Geology,2010,45(3):681-697(in Chinese with English abstract).
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