概况潜西地区从地形上看比较平坦,但地貌的变化较大,有沙地、盐渍土、盐碱湿地、芦苇草包等多种类型,有时一个排列就跨过这几种类型,变化是比较频繁的。炮井岩性多为砂砾与砂质粘土的互层,粘土层很薄,单层厚度一般不超过三米。岩性在纵向和横向上的变化很大,有时相隔二十米的两口井所得岩屑截然不同。低速带厚度在二十六米内变化,浅层的速度剖面是高、低速层相间,且不稳定,难以确定降速层底界。浅水面 At a glance, the subsidence area is relatively flat from the topography, but the change of topography is quite large. There are many types of sandy land, saline soil, saline-alkali wetland and reed grass bag, and sometimes one arrangement straddles these types, the change is More frequent. Artillery lithology and gravel mostly sandy interbedded with sandy clay, clay layer is very thin, the thickness of a single layer is generally not more than three meters. Lithology varies greatly vertically and horizontally, and sometimes the cuttings from two wells that are twenty meters apart are quite different. The thickness of the low velocity belt varies within 26 meters. The shallow velocity profile is high and low velocity, and unstable. It is difficult to determine the bottom boundary of the velocity reduction layer. Shallow surface