珠江口盆地陆相烃源岩与油气生成

NONMARINE SOURCE ROCK AND PETROLEUM FORMATION OF PEARL RIVER MOUTH BASIN

在珠江口盆地，早第三纪盆地张裂Ⅱ期是古湖泊鼎盛发育期，该期形成的湖相烃源岩是盆地的主力油源岩，经油源对比研究，已投到的储量可观的正常原油主要来源于该油源岩。张裂Ⅲ期是古湖泊的萎缩期，形成了广泛分布的煤系烃源岩，以该源岩为烃源的油气田相继被发现，证实该烃源岩是盆地的主要气源岩和重要的油源岩。这两套烃源岩生成油气的潜力巨大，由此揭示，珠江口盆地具有十分良好的油气勘探远景。

The paleo-lake within the Pear River Mouth Basin (PRMB) area is in its great prosperity area during the rifting stage Ⅱ of Paleogene. The lacustrine strata formed in the stage are the major oil source rocks of PRMB. Oil/rock correlation shows that enormous normal crudes found in the basin are mainly derived from the lacustrine source rocks. The paleo-lake is in contraction stage during the rifting stage Ⅲ ,forming widely spreaded coal measures. Oil and gas sourced from coal measures were successively discovered in PRMB. This proves that the coal measures are the principal gas source rocks and important oil souce rocks. Both lacustrine and coal measure source rocks have great potential for oil and gas generation. So, PRMB has bright future for petroleum exploration.