中国东部的含油气盆地星罗棋布。新中国成立后,通过二十多年的石油普查和勘探工作,找到了许多油气田并已投入开发生产。在进行石油地质工作过程中,积累了大量古生物资料,如介形类、双壳类、腹足类、叶肢介、孢粉、轮藻等。这些丰富资料为确定有关含油岩系的地层层序及其时代起了重要作用,也为推断含油岩系的沉积环境提供了大量依据。在这些化石中,以介形类最为丰富,保存完整。许多研究工作者对各含油岩系的介形类进行了分区分层的详细研究,划分、建立了若干地区性的化石组合。这些 Petroliferous basins in eastern China are dotted. After the founding of new China, through more than two decades of oil census and exploration work, many oil and gas fields have been found and have been put into development and production. During the process of petroleum geology, a large amount of paleontological data have been accumulated, such as the genera, bivalves, gastropods, leaf extremities, spore powder, charophytes and so on. These rich data play an important role in determining the stratigraphic sequence and age of oil-bearing rock series, and provide ample basis for inferring the sedimentary environment of oil-bearing rock series. Among these fossils, the most abundant and preserved ones are orthopedic ones. Many researchers conducted a detailed study on the classification of the ostracods of the various oil-bearing rock series by zoning, and established a number of regional fossil assemblages. These ones