珠三坳陷典型油气藏及成藏条件分析

TYPICAL OIL AND GAS RESERVOIRS AND THEIR FORMING CONDITIONS IN AHU Ⅲ SAG

对珠三坳陷4个典型油气藏的分析表明，这些油气藏的形成一方面与盆地区域性生、储、盖层发育及两个主要构造形成期（渐新世末和中中新世末）有关，更重要的成藏条件应为：（1）构造圈闭临近富生烃凹陷；（2）较完整的造圈内，发育良好的储盖组合；（3）油气藏附近具有高效率的油气运移通道的输导网络，如断层，连通的砂体等；（4）成藏期相对较晚与油气输入期配置好。

The analyses of 4 typical oil and gas reservoirs in Zhu Ⅲ sag of the Pearl River Mouth basin show that the formation of these reservoirs is related to the regional development of source rock ,reservoir ,cap rock and two periods (end of Oligocene and end of middle Miocene) of trap formation in the basin, while more important things for the formation of the reservoirs are the following factors: (1)being close to the center of rich hydrocarbon generation; (2)being relatively complete trap with suitable sandstone ratio and well-developed reservoir and cap rocks; (3)with high-efficient oil migration pathways and conducting networks nearby the oil reservoirs,such as faults and connected sand bodies; (4) being relatively late in formation of oil reservoirs, that is well-assorted with the oil charging period.