龙门山北段构造模式及油气勘探方向
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摘要
通过对龙门山北段地区的野外地质调查,以青川—茂汶,北川—映秀和马角坝—灌县断裂为界,将龙门山北段分为后山带、前山带和山前带。结合地表地质的观察和地震资料的综合解释将龙门山北段地区地腹构造划分为3个构造单元,即地表及浅层推覆构造单元、地腹叠瓦式构造单元以及山前单斜构造单元。根据野外调查分析结合区域钻井资料认为龙门山北段地区纵向发育多套有利的生储盖组合,推覆构造运动一方面为油气运移提供了动力和富集圈闭;同时多次构造运动的叠加破坏了早期形成的油气藏。综合龙门山北段地区构造运动、油气生储盖条件等对油气成藏的影响认为,纵向上地腹二叠系叠瓦构造单元为油气聚集有利区带,而平面上山前的隐伏前锋带是未来的勘探方向。
According to the field geology survey of northen section of Longmen mountain,the Qing Chuan~Mao Wen fault,Bei Chuan~Ying Xiu fault and Ma Jiao Ba fault are used as the boundary,the mountain can be divided to back belt,front belt and foothill belt.Combining the surface geology survey and comprehensive interpretation of seismic data,three structural units are divided in the subsurface of northen section of Longmen mountain,they are surface and shallow layer structural units,imbricate unit in subsurface and monocline unit in foothill belt.Based on the analysis of field survey and the drilling data in this area,it seems that there are several suits of source beds,reservoirs and cap rocks in the vertical direction in northen section of Longmen mountain.The thrust movement can provide dynamic force and trap for oil-gas migration,on the other hand,the overlay structural movement can also destroy the early oil-gas reservoir.Combining the affection of structural movement,oil-generating condition,reservoir condition and capping formation condition to the oil-gas aggregation in northen section of Long men mountain,it seems that,the imbricate unit of permain layer in subsurface is a favorable zone for oil-gas accumulation,the buried faults zone in foothill belt are the future exploitation direction in this area.
According to the field geology survey of northen section of Longmen mountain,the Qing Chuan~Mao Wen fault,Bei Chuan~Ying Xiu fault and Ma Jiao Ba fault are used as the boundary,the mountain can be divided to back belt,front belt and foothill belt.Combining the surface geology survey and comprehensive interpretation of seismic data,three structural units are divided in the subsurface of northen section of Longmen mountain,they are surface and shallow layer structural units,imbricate unit in subsurface and monocline unit in foothill belt.Based on the analysis of field survey and the drilling data in this area,it seems that there are several suits of source beds,reservoirs and cap rocks in the vertical direction in northen section of Longmen mountain.The thrust movement can provide dynamic force and trap for oil-gas migration,on the other hand,the overlay structural movement can also destroy the early oil-gas reservoir.Combining the affection of structural movement,oil-generating condition,reservoir condition and capping formation condition to the oil-gas aggregation in northen section of Long men mountain,it seems that,the imbricate unit of permain layer in subsurface is a favorable zone for oil-gas accumulation,the buried faults zone in foothill belt are the future exploitation direction in this area.
引文
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[11]杨长清,刘树根,曹波,等.龙门山造山带与川西前陆盆地耦合关系及其对油气成藏的控制[J].成都理工大学学报(自然科学版),2008,35(4):471-476.
[12]胡受权,郭文平,童崇光,等.龙门山系山前带北段超晚期褶皱构造与油气远景[J].西南石油学院学报,2001,23(2):5-8.
[13]童崇光,胡受权.龙门山山前带北段油气远景评价[J].成都理工学院学报,1997,24(2):5-7.
[14]谢邦华,王兰生,张鉴,等.龙门山北段烃源岩纵向分布及地化特征[J].天然气工业,2003,23(5):22-23.
[2]李耀华,陈更生,张健,等.川西前陆盆地天然气成藏条件及勘探前景[J].中国石油勘探,2002,7(1):37-39.
[3]王天泽.龙门山逆冲作用在川西盆地演化及油气勘探中的意义[J].现代地质,1997,11(4):496-498.
[4]王金琪.龙门山构造演化与山前带油气关系[J].地球学报,1994,3(4):175-176.
[5]刘顺.论龙门山中北段东缘印支运动晚幕的性质[J].成都理工学院学报,1998,25(4):527-528.
[6]贾东,陈竹新,贾承造,等.龙门山前陆褶皱冲断带构造解析与川西前陆盆地的发育[J].高校地质学报,2003,9(3):403-404.
[7]邓康龄.龙门山构造带印支期构造递进变形与变形时序[J].石油与天然气地质,2007,28(4):486-488.
[8]金文正,汤良杰,杨克明,等.川西龙门山褶皱冲断带分带性变形特征[J].地质学报,2007,81(8):1075-1078.
[9]陈竹新,贾东,张惬,等.龙门山前陆褶皱冲断带的平衡剖面分析[J].地质学报,2005,79(1):40-42.
[10]李智武,刘树根,陈洪德,等.龙门山冲断带分段-分带性构造格局及其差异变形特征[J].成都理工大学学报(自然科学版),2008,35(4):440-454.
[11]杨长清,刘树根,曹波,等.龙门山造山带与川西前陆盆地耦合关系及其对油气成藏的控制[J].成都理工大学学报(自然科学版),2008,35(4):471-476.
[12]胡受权,郭文平,童崇光,等.龙门山系山前带北段超晚期褶皱构造与油气远景[J].西南石油学院学报,2001,23(2):5-8.
[13]童崇光,胡受权.龙门山山前带北段油气远景评价[J].成都理工学院学报,1997,24(2):5-7.
[14]谢邦华,王兰生,张鉴,等.龙门山北段烃源岩纵向分布及地化特征[J].天然气工业,2003,23(5):22-23.
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