楚雄盆地扭动构造及其演化
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摘要
以地震资料解释成果为基础,从平面和剖面上识别楚雄盆地的扭动构造,并结合区域古地磁资料、应力场特征以及盆地沉积演化,分析研究区不同构造期的扭动变形机制及其演化。结果表明,中生代以来,楚雄盆地受到特提斯构造域向北和滨太平洋构造域向西的推挤力,2个推挤力在不同构造期分别占主导地位,并致使红河断裂左行、右行走滑交替,控制着楚雄盆地的构造和沉积演化;印支期金沙江洋关闭、思茅—印支地块与扬子板块拼合后,金沙江—红河碰撞带东侧的楚雄盆地不属于前陆盆地,板块拼合过程中红河断裂走向与推挤方向形成小角度斜交,主要发生走滑运动,未产生大规模造山,随后在晚印支期南北向挤压应力场中形成楚雄裂陷盆地;研究区南部楚雄—牟定一带沉积厚度的剧烈变化源于楚雄—建水断裂和牟定断裂中生代走滑运动产生的拉分效应;楚雄盆地的火成岩分布往往与大型基底断裂的后期扭动作用有关,这有利于圈定火成岩分布范围,在油气勘探中应有针对性地加以回避。
Chuxiong basin locates at the southwestern margin of Yangtze Plate and Central Yunnan Secondary Block of the South Sichuan-Yunnan rhombic block. It is bounded by the Red River Fault in the southwest corner and Xiaojiang Fault in the east border. SinceMesozoic, the basin suffered from a pair of extrusion force with northward direction from the Tethys tectonic domain and westward direction from Marginal Pacific tectonic domain. Each force dominated alternately in different tectonic stages and results in left or right-lateral strike-slips of the Red River Fault which controlled the tectonic and depositional evolution of the Basin. The wrench tectonics was identified according to the planar and sectional characteristics with the results of seismic interpretation in Chuxiong basin. On that basis, the dynamic deformation mechanism of the wrench tectonics in each tectonic stage was analyzed combining Paleomagnetic data and stress field of each stage as well as depositional evolution of the basin. It is concluded that:1 The Chuxiong basin was not a foreland basin which located on the east side of Jinshajiang collision belt after the conjunction of Indochina block into Yangtze Plate. The Red River Fault was mainly in strike-slip motion because of the small angle between the strike of the fault and the movement direction of Indochina block, and didn't give rise to large scale mountain orogenesis. Thereafter, the Chuxiong basin was evolved into a rifted basin in the SN directional extrusion force of the late Indosinian period.2The abrupt change of sedimentary thickness in the region of Chuxiong-Mouding was influenced by the pull-apart effects during the striking-slip movement of Chuxiong-Jianshui Fault and Mouding Fault. 3The distribution of igneous rock in the basin is closely related to the shear movement of the large-scale basement faults in the later stage, which makes it easy to be outlined and to be avoided in the hydrocarbon exploration.
Chuxiong basin locates at the southwestern margin of Yangtze Plate and Central Yunnan Secondary Block of the South Sichuan-Yunnan rhombic block. It is bounded by the Red River Fault in the southwest corner and Xiaojiang Fault in the east border. SinceMesozoic, the basin suffered from a pair of extrusion force with northward direction from the Tethys tectonic domain and westward direction from Marginal Pacific tectonic domain. Each force dominated alternately in different tectonic stages and results in left or right-lateral strike-slips of the Red River Fault which controlled the tectonic and depositional evolution of the Basin. The wrench tectonics was identified according to the planar and sectional characteristics with the results of seismic interpretation in Chuxiong basin. On that basis, the dynamic deformation mechanism of the wrench tectonics in each tectonic stage was analyzed combining Paleomagnetic data and stress field of each stage as well as depositional evolution of the basin. It is concluded that:1 The Chuxiong basin was not a foreland basin which located on the east side of Jinshajiang collision belt after the conjunction of Indochina block into Yangtze Plate. The Red River Fault was mainly in strike-slip motion because of the small angle between the strike of the fault and the movement direction of Indochina block, and didn't give rise to large scale mountain orogenesis. Thereafter, the Chuxiong basin was evolved into a rifted basin in the SN directional extrusion force of the late Indosinian period.2The abrupt change of sedimentary thickness in the region of Chuxiong-Mouding was influenced by the pull-apart effects during the striking-slip movement of Chuxiong-Jianshui Fault and Mouding Fault. 3The distribution of igneous rock in the basin is closely related to the shear movement of the large-scale basement faults in the later stage, which makes it easy to be outlined and to be avoided in the hydrocarbon exploration.
引文
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[20]徐康,于炳松.塔里木盆地巴楚一间房地区二叠系侵入岩特征及其对储层的影响[J].油气地质与采收率,2013,20(5):48-51.
[21]万丛礼,金强,李钜源,等.论裂谷盆地侵入岩区天然气的混合性——以沾化凹陷孤北地区为例[J].油气地质与采收率,2013,20(4):1-4,16.
[22]徐兴友.岩浆侵入对油气地化特征的影响——以惠民凹陷为例[J].油气地质与采收率,2011,18(3):10-13.
[23]马宁,侯读杰,包书景,等.页岩气资源潜力评价方法[J].油气地质与采收率,2012,19(6):25-29.
[24]孟庆峰,侯贵廷.页岩气成藏地质条件及中国上扬子区页岩气潜力[J].油气地质与采收率,2012,19(1):11-14.
[25]范柏江,师良,庞雄奇.页岩气成藏特点及勘探选区条件[J].油气地质与采收率,2011,18(6):9-13.
[2]陈根文,吴延之.楚雄弧后前陆盆地的形成及演化[J].云南地质,1999,18(4):392-397.
[3]吴根耀.造山带古地理学——重建区域构造古地理的若干思考[J].古地理学报,2007,9(6):635-647.
[4]程宏岗.楚雄中生代盆地原始盆地恢复及其演化[D].西安:西北大学,2004.
[5]刘池洋,赵红格,杨兴科,等.前陆盆地及其确定和研究[J].石油与天然气地质,2002,23(4):307-313.
[6]李齐,陈文寄,万景林,等.哀牢山-红河剪切带构造抬升和运动形式转换时间的新证据[J].中国科学:D辑地球科学,2000,30(6):576-582.
[7]刘宝珺,许效松,潘杏南,等.中国南方古大陆沉积地壳演化与成矿[M].北京:科学出版社,1993:42-43.
[8]向宏发,万景林,韩竹军,等.红河断裂带大型右旋走滑运动发生时代的地质分析与FT测年[J].中国科学:D辑地球科学,2006,36(11):977-987.
[9]严俊君,王燮培.关于扭动构造的鉴别问题[J].石油与天然气地质,1996,17(1):8-13.
[10]陆克政.构造地质学教程[M].东营:石油大学出版社,1994:206-207.
[11]万天丰.中国大地构造学纲要[M].北京:地质出版社,2004:166-205.
[12]贾承造,何登发,陆洁民.中国喜马拉雅运动的期次及其动力学背景[J].石油与天然气地质,2004,25(2):121-125,169.
[13]王国力,蔡立国,汪集旸,等.楚雄盆地构造—热演化与古地温场研究[J].石油实验地质,2005,27(1):28-31.
[14]王二七,孟庆任,陈智,等.龙门山断裂带印支期左旋走滑运动及其大地构造成因[J].地学前缘,2001,8(2):375-384.
[15]刘育燕,乙藤洋一郎,玉井雅人.川滇菱形地块白垩纪古地磁学特征[J].地球科学——中国地质大学学报,1999,24(2):145-148.
[16]张培震,王琪,马宗晋.青藏高原现今构造变形特征与GPS速度场[J].地学前缘,2002,9(2):442-447.
[17]滕吉文.康滇构造带岩石圈物理与动力学[M].北京:科学出版社,1994.
[18]周伟,李延兴,张静华,等.川滇地区现今构造变形分析[J].大地测量与地球动力学,2008,28(2):22-27.
[19]吕弋培,廖华,苏琴,等.川滇菱形块体边界的现今地壳形变[J].中国地震,2002,18(1):28-37.
[20]徐康,于炳松.塔里木盆地巴楚一间房地区二叠系侵入岩特征及其对储层的影响[J].油气地质与采收率,2013,20(5):48-51.
[21]万丛礼,金强,李钜源,等.论裂谷盆地侵入岩区天然气的混合性——以沾化凹陷孤北地区为例[J].油气地质与采收率,2013,20(4):1-4,16.
[22]徐兴友.岩浆侵入对油气地化特征的影响——以惠民凹陷为例[J].油气地质与采收率,2011,18(3):10-13.
[23]马宁,侯读杰,包书景,等.页岩气资源潜力评价方法[J].油气地质与采收率,2012,19(6):25-29.
[24]孟庆峰,侯贵廷.页岩气成藏地质条件及中国上扬子区页岩气潜力[J].油气地质与采收率,2012,19(1):11-14.
[25]范柏江,师良,庞雄奇.页岩气成藏特点及勘探选区条件[J].油气地质与采收率,2011,18(6):9-13.
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