关于扭动构造的鉴别问题
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摘要
鉴别扭断裂的地下标志归纳为九点：（１）雁列构造；（２）花状构造；（３）辫状构造；（４）窄变形带；（５）窄而深的半地堑构造；（６）窄而厚的粗相带；（７）两盘地层岩性不相匹配；（８）断面倾向摇摆、多变；（９）杂乱的地震显示。然而在实际应用中由于鉴定不准确存在夸大平移扭动作用的趋向，特别是在鉴别“雁列构造”和“花状构造”两个重要标志中出现的问题较大，关键问题是：（１）张性雁列构造并不一定指示平移扭动；（２）对于盆地内薄皮构造而言，“基底卷入”不应作为扭断裂的根本鉴别标志；（３）我国西部各油区广泛发育的“背冲断块”大多不属“花状构造”。
The subsurface markers for identifying wrench structure could be concluded as follows:(1)echelon structure 3(2) flower-form structure;(3)braid structure;(4).narrow deformationzone;(5) deep narrow half-graben;(6) narrow thick coarse deposit zone;(7) unmatchablestrata across a fault;(8)swaying and variable fault dip;(9)clutter seismic reflection.However,the trend of overstating the effect ofwrenching may occur due to inaccurate identification in actual application, especially in identifying echelon structure and flower-formstructure.The key problems are(1) tenso-echelon does not always indicate wrench fracture;(2) as for the shallow-rooted structures in a basin,"basement-involving"could not be theessential identificative criterion of wrench fault I(3)the back--thrust blocks that widely developed in oil provinces in West China are mostly not flower-form structures.
The subsurface markers for identifying wrench structure could be concluded as follows:(1)echelon structure 3(2) flower-form structure;(3)braid structure;(4).narrow deformationzone;(5) deep narrow half-graben;(6) narrow thick coarse deposit zone;(7) unmatchablestrata across a fault;(8)swaying and variable fault dip;(9)clutter seismic reflection.However,the trend of overstating the effect ofwrenching may occur due to inaccurate identification in actual application, especially in identifying echelon structure and flower-formstructure.The key problems are(1) tenso-echelon does not always indicate wrench fracture;(2) as for the shallow-rooted structures in a basin,"basement-involving"could not be theessential identificative criterion of wrench fault I(3)the back--thrust blocks that widely developed in oil provinces in West China are mostly not flower-form structures.
引文
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