本质上 ,边缘海相储层是由一系列复杂排列的岩相所组成 ,代表几种亚环境结合部位的特征。在边缘海环境中 ,对应于相对海平面变化 ,关键的层序界面之上可被淡水、半咸水和纯海水 (沉积 )所覆盖。因此 ,在对这样的储层进行勘探和开发时 ,区分淡水、半咸水和纯海水沉积就显得格外重要。而遗迹化石组合有助于区分这些环境。总的来说 ,半咸水遗迹化石组合有如下特征 :①低分异度 ;②贫乏的海相组合 ,而不是海相和非海相的混合 ;③由机会物种形成的简单构造组成 ;④遗迹组合常以某个遗迹属为主 ;⑤形态微小 ;⑥由Skolithos和Cruziana遗迹相中常见的垂直和水平遗迹化石构成 In essence, the marginal marine reservoir consists of a series of complexly arranged facies that represent several sub-environmental binding features. In the marginal sea environment, corresponding to changes in relative sea level, the key sequence boundaries above can be covered with freshwater, brackish water and pure seawater (sediment). Therefore, in the exploration and development of such reservoirs, the distinction between freshwater, brackish water and pure seawater deposition is of special importance. The heritage fossil assemblage helps distinguish these environments. In general, the combination of brackish water trace fossil assemblages has the following characteristics: ① low degree of differentiation; ② poor marine combination, not marine and non-marine mixture; ③ simple structure formed by opportunistic species; ④ The combination of relics is often dominated by some relics; ⑤ Smaller forms; ⑥ Composition of vertical and horizontal relics common to the Skolithos and Cruziana relics