阿姆河右岸东南部吉萨尔山前中下侏罗统构造格架及成因分析
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摘要
以现有地质及地震资料为基础,对阿姆河右岸区块东南部靠近吉萨尔山前地区的中下侏罗统主要构造特征进行探讨,一方面有利于促进该区中下侏罗统油气勘探,同时也有利于深化对造山带向盆地过渡的山前地区构造变形规律的认识。研究表明:该区中下侏罗统整体表现为由三列近似呈雁行状排列的NE向背斜带组成的褶皱-冲断构造。从控制背斜构造发育的断裂活动特征看,东部山前断层表现为由南东向北西方向逆冲,活动强度大,向西逆断层运动的强度逐渐减弱,且由南向北西部断层的逆冲运动方向发生反向变化,在研究区的北部发育典型的构造三角带。西部背斜带可视为断裂运动方式由南向北变化导致的调节构造。沿构造带走向,三列背斜构造高点由南向北逐渐升高。通过对中下侏罗统构造变形与上覆地层构造特征的比较,结合该区侏罗系沉积特征,认为中下侏罗统构造变形是与上覆地层构造变形共同形成于新近纪喜山期统一的区域构造运动背景下。其主要构造变形机制是晚古近—新近纪以来,在印度板块、阿拉伯板块和欧亚板块碰撞远程效应影响下,受吉萨尔山脉的隆升挤压和研究区北部NW向的大型断裂如布哈拉断裂、曼格什拉克断裂的右旋压扭共同作用而成。
On the bases of existing geological and geophysical data,the main structural feature of the low-middle Jurassic series in the southeast of Amu–Dar'ya right bank area close to Gissar mountain has been researched in this paper,which might promote the exploration of oil and gas in this area and simultaneously might deepen the realization of the structural deformation rule on the front of orogenic zones.The investigation indicates that thrust-fold zones consisting of three en echelon folds stretching from southwest to northeast develop in the low-middle Jurassic series in the southeast of Amu–Dar'ya right bank area near the Gissar mountain.The folds are mainly originated from fault propagation.As far as the activity of controlling faults is concerned,the faults in the east thrust to the west,with strength weakening from east to west.In the west,the direction of faults' thrust motion turn to opposite from south to north so that the typical triangular structural zone develops in the north area and the west anticline zone might be regarded as a transfer zone arising from the change of faults' thrust manner from south to north.Along the strike of the structural zone,the anticline structural high rises from south to north,indicating that the faults' activity strength becomes intense to the north.By comparing the deformation of the low-middle Jurassic series with that of overlying strata,it could be deduced that the deformation of the low-middle Jurassic series associated with that of the overlying formations developed during the Neogene period together.Since late Paleogene to Neogene era,under the influence of the collision between Euroasia plate and the Indian plate along with Arab plate,the dynamical mechanism of the above structural deformation is the compression due to the uplift of Gissar mountain as well as the clockwise compresso-shear stress of the north great faults with NW-SE strike direction,such as Buhara fault and Mangyshlak fault etc..
On the bases of existing geological and geophysical data,the main structural feature of the low-middle Jurassic series in the southeast of Amu–Dar'ya right bank area close to Gissar mountain has been researched in this paper,which might promote the exploration of oil and gas in this area and simultaneously might deepen the realization of the structural deformation rule on the front of orogenic zones.The investigation indicates that thrust-fold zones consisting of three en echelon folds stretching from southwest to northeast develop in the low-middle Jurassic series in the southeast of Amu–Dar'ya right bank area near the Gissar mountain.The folds are mainly originated from fault propagation.As far as the activity of controlling faults is concerned,the faults in the east thrust to the west,with strength weakening from east to west.In the west,the direction of faults' thrust motion turn to opposite from south to north so that the typical triangular structural zone develops in the north area and the west anticline zone might be regarded as a transfer zone arising from the change of faults' thrust manner from south to north.Along the strike of the structural zone,the anticline structural high rises from south to north,indicating that the faults' activity strength becomes intense to the north.By comparing the deformation of the low-middle Jurassic series with that of overlying strata,it could be deduced that the deformation of the low-middle Jurassic series associated with that of the overlying formations developed during the Neogene period together.Since late Paleogene to Neogene era,under the influence of the collision between Euroasia plate and the Indian plate along with Arab plate,the dynamical mechanism of the above structural deformation is the compression due to the uplift of Gissar mountain as well as the clockwise compresso-shear stress of the north great faults with NW-SE strike direction,such as Buhara fault and Mangyshlak fault etc..
引文
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[14]唐辉,李岩,唐剑.土库曼斯坦阿姆河右岸地层岩性及其石油地质特征研究[J].内江科技,2010,(2):99.
[15]张志伟,何永圭,王春生,等.中亚地区阿姆河盆地查尔朱、布哈拉阶地构造特征及演化[J].海相油气地质,2010,15(4):48-56.
[16]徐剑良,程绪彬,吴蕾,等.阿姆河右岸区块构造演化与成藏条件[J].天然气工业,2010,30(5):18-20.
[17]徐文礼,郑荣才,费怀义,等.土库曼斯坦阿姆河右岸卡洛夫—牛津阶裂缝特征及形成期次[J].天然气工业,2012,(04):33-38.
[18]费怀义,徐刚,王强,等.阿姆河右岸区块气藏特征[J].天然气工业,2010,30(05):13-17.
[19]罗金海,车自成.中亚与中国西部侏罗纪沉积盆地的成因分析[J].西北大学学报(自然科学版),2001,31(2):167-170.
[2]施央申,卢华复,贾东,等.中亚大陆古生代构造形成及演化[J].高校地质学报.1996,2(2):134-145.
[3]Boris A.,Natal’in,Celal S A M.Late Palaeozoic to Triassic evolution of the Turan and Scythian platforms:The pre-history of the PalaeoTethyan closure[J].Tectonophysics,2005,404:175-202.
[4]Kravchenko K N.,Koshelev N l.,Kravchenko N E.,et al.The regional structure of the turanian platform and its development[J].Tectonophysics,1976,36(1-3):263-273.
[5]徐传会,钱桂华,张建球,等.滨里海盆地油气地质特征与成藏组合[M].北京:石油工业出版社,2009,14-19.
[6]徐文世,刘秀联,余志清,等.中亚阿姆河含油气盆地构造特征[J].天然气地球科学,2009,20(5):744-748.
[7]李国玉,金之钧.新编世界含油气盆地图集(上册)[M].北京:石油工业出版社,2005,28-31.
[8]孙林.土库曼斯坦阿姆河右岸三维勘探区侏罗系盐下礁体识别及目标选择[D].中国地质大学,2010,15-45.
[9]严维理,江鸿,吴先忠,等.阿姆河右岸区块地质特征与钻井设计[J].天然气工业,2010,30(5):73-76.
[10]中俄土合作研究项目组.中俄土天然气地质研究新进展[M].北京:石油工业出版社,1995,126-229.
[11]李浩武,童晓光,王素花,等.阿姆河盆地侏罗系成藏组合地质特征及勘探潜力[J].天然气工业,2010,30(5):6-12.
[12]徐树宝,王素花,孙晓军.土库曼斯坦油气地质和资源潜力[J].石油科技论坛,2007,6:31-38.
[13]Brookfield M E.,Hashmat A.The geology and petroleum potential of the North Afghan platform and adjacent areas[J].Earth Science Review,2001,55:41071.
[14]唐辉,李岩,唐剑.土库曼斯坦阿姆河右岸地层岩性及其石油地质特征研究[J].内江科技,2010,(2):99.
[15]张志伟,何永圭,王春生,等.中亚地区阿姆河盆地查尔朱、布哈拉阶地构造特征及演化[J].海相油气地质,2010,15(4):48-56.
[16]徐剑良,程绪彬,吴蕾,等.阿姆河右岸区块构造演化与成藏条件[J].天然气工业,2010,30(5):18-20.
[17]徐文礼,郑荣才,费怀义,等.土库曼斯坦阿姆河右岸卡洛夫—牛津阶裂缝特征及形成期次[J].天然气工业,2012,(04):33-38.
[18]费怀义,徐刚,王强,等.阿姆河右岸区块气藏特征[J].天然气工业,2010,30(05):13-17.
[19]罗金海,车自成.中亚与中国西部侏罗纪沉积盆地的成因分析[J].西北大学学报(自然科学版),2001,31(2):167-170.
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