摘要
理想的沉积盆地地下水动力场模式可以归纳为对称型和不对称型两种,其中局部地下水动力单元可以划分为4种类型:①泥岩压榨水离心流;②大气水下渗向心流;③越流、越流-蒸发泄水;④滞留。地下水动力场演化具有旋回性,每个旋回可以分为两个阶段:①盆地沉降接受沉积时期的泥岩压榨水离心流阶段;②盆地抬升剥蚀阶段的大气水下渗向心流阶段。随着沉积盆地的形成与演化,水动力场也有形成、发展和消亡的过程。松辽盆地地下水动力场具有明显的不对称性:盆地北部和东部大气水不对称下渗形成向心流;中央拗陷区压榨水形成离心流和越流;盆地南部以越流-蒸发浓缩为特征。在纵向上地下水动力的强度具有分带性,由浅到深,可以划分出强、弱、停滞3个带。
Theoretical models of the hydrodynamicfield for petroliferous sedimentary basins may be classified into the symmetrical and asymmetrical types. In sedimentary basins, four local hydrodynamic units can be distinguished : (1) centrifugal flow caused by mudstone compaction in the depressions, (2) gravity-induced centripetal flow recharged by meteoric water infiltration at basin edges, (3) leaky flow, or leaky flow-evaporation loss, and (4) stagnation. The evolution of the hydrodynamic field was cyclic and each cycle may be divided into centrifugal flow stages when the basin subsides and receives deposits, and centripetal flow stage when the basin uplifts and is eroded. Accompanying the formation and evolution of the sedimentary basin, the hydrodynamic field would has a process of formation, development and elimination.The hydrodynamic field in the Songliao basin is obviously asymmetrical. Meteoric water in the northern and eastern parts of the basin infiltrated down asymmetrically to form the gravity-induced centripetal flow; water resulting from mudstone compaction in the depression in the central part of the basin formed centrifugal flow and leaky flow; the southern part of the basin is characterized by leaky flow-evaporation concentration. The intensity of groundwater hydrodynamics shows vertical zoning. With increasing depth, strong, weak and stagnant water zones may be distinguished.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2001年第1期111-120,共10页
Acta Geologica Sinica
