塔北西部英买力地区英买2工区古生界盐构造样式研究
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摘要
盐构造研究对于油气勘探和理论研究均有着重要的意义。塔北隆起是塔里木盆地的重要勘探区块。根据地震及钻井资料,研究了塔北隆起西部英买力地区英买2工区古生界盐构造样式、形成机制及其对区域构造的影响。塔北隆起西部古生界发育了与中寒武统膏盐岩有关的盐构造样式,包括盐丘、盐上逆断层、盐上正断层。通过相干图分析可见盐丘从底到顶展示出有规律的变化,盐底变形强的地区在顶部变形弱,而盐底变形弱的地区在顶部变形强;变形强弱的不同在相干图上表现为与周围不协调的椭圆,从盐丘底部到顶部,椭圆的长轴方向逆时针旋转了30°,反映了变形时有走滑运动的分量存在。通过演化剖面恢复,认为古生界盐构造在古生代末基本形成了现在的形态,在三叠纪断裂重新活动,伴随着生长地层发育。膏盐层的分隔作用造成了构造层次之间构造样式的不协调及其分层性特征,盐构造形成的构造裂隙控制了后期火成岩的发育部位。
Research on salt tectonics is a crucial element of petroleum exploration and scientific problems.Tabei Uplift,one of the most important exploration areas in Tarim basin,has the most proved reserves and oil production in all the first level structure units of this region.Based on seismic and well data,the salt structure styles,formation mechanism and influence on regional tectonics of Tabei Uplift is investigated in this paper in Yingmai 2 work district,Yingmaili area,western Tabei Uplift.Middle Cambrian salt structures are extensively developed in western Tabei Uplift.Salt structure styles,such as salt domes,suprasalt reverse faults and suprasalt normal faults are recognized.Using event similarity prediction technique,the regular variation of salt domes from bottom to top can be clearly revealed in coherent horizontal slices,which shows that a intensely deformed bottom part usually has a slightly deformed top,and vice versa.In the coherent horizontal slices,this differential deformation forms a series of ellipses,which rotate 30°counter clockwise from bottom to top.It is implied that western Tabei Uplift underwent strike slip movement in Late Paleozoic when salt deformation took place.Salt structures were deformed in compressional tectonic setting in Late Paleozoic and,according to the analysis of the structural evolution section,the main fault was remobilized as a synsedimentary fault in Triassic with a limited scale.After Triassic these structures were relatively stable.Salt layers significantly influenced the tectonic deformation.In structural layers below and above them,inharmonious structure styles were formed.In addition,the Palaeozoic fractures,which were formed during salt movement,controlled the space distribution of latter developed magmatism.
引文
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