The complex of sand bodies developed in a cyclical sequence of off-lapping sedimentary beds. 砂岩复合体发育于退覆沉积层的旋回层内。
It is a transitional stage for the whole world oil and gas exploration from sedimentary layers to buried hills and basements. 中酸性喷出岩是断陷盆地沉积剖面的重要组成部分，是整个世界石油勘探从沉积层勘探向潜山和基底勘探的过渡阶段。
