Control of Structural Heights in Overburden and Substrate Evaporite Layers in Forelands and Its Petroleum Implication
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摘要: 盐构造区经常有盐上、盐下层构造高点不对应的现象.根据边界受力条件的不同和盐岩与其他岩类的流变学性质的差异, 建立了在盐参入变形条件下, 前陆充填变形的盐上、盐下层构造高点关系的2种情况, 即当造山楔向前陆充填盐下层楔入时, 盐上向斜槽部对应盐下背斜顶部; 当造山楔向前陆充填仰冲时, 盐上背斜后翼对应盐下背斜顶部, 盐上背斜顶部对应盐下背斜前翼.结合库车前陆区的石油勘探实践, 讨论了2种情况的石油地质意义.Abstract: It is a common phenomenon that the structural heights in the overburden and substrate evaporite layers are not in agreement with each other in the salt tectonic areas. Two kinds of relationships between structural heights in the overburden evaporite and those in the substrate evaporite in the forelands, where evaporite experienced the deformation, were established in line with the differences both in the boundary stress states and in the rock rheology. When an orogenic wedge underthrusts the evaporite-bearing foreland basin fill, the troughs of overburden synclines will directly match the peaks of substrate anticlines. When an orogenic wedge overrides the evaporite-bearing foreland basin fill, the back-limbs of overburden anticlines will match the peaks of substrate anticlines, and the peaks of overburden anticlines will match the front-limbs of substrate anticlines. Finally, the discussion of the petroleum implication for the two relationships was based on the petroleum exploration in Kuqa foreland.
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Key words:
- foreland deformation /
- salt tectonic /
- structural height /
- petroleum geology
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图 1 前陆区盐上盐下构造高点配置关系
Fig. 1. Relations of structural heights in overburden to those in substrate in forelands
图 2 库车前陆区西段构造带及盐构造区
BTP.包孜东构造区; WTP.温巴什构造区; TTP.托克逊构造区; KTP.康村构造区
Fig. 2. Kuqa foreland structures and salt tectonics
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