准噶尔盆地陆东-五彩湾地区石炭系源岩演化及成藏时序

陆东-五彩湾地区石炭系源岩呈带状分布,源岩最发育区位于滴南凸起西段及其南部。不同地区石炭系源岩成熟度差异较大,成熟度中心沿滴南凸起西段-五彩湾凹陷北西向展布,向南、向北成熟度降低。通过源岩热演化史及包裹体温度,综合分析了该区的油气成藏过程。不同区块表现出明显的成藏时序性,第一期成藏时间由早到晚的顺序依次是五彩湾—滴南西段—滴南东段—滴北地区。源岩分布、演化及成藏时序控制了该区的油气分布。

Evolution of the Carboniferous source rocks and hydrocarbon accumulation sequence in Ludong-Wucaiwan area, the Juggar Basin

The Carboniferous source rocks in the LudongˉWucaiwan area are in zonal distribution and are most highly developed in the west and south parts of the Dinan uplift in the area.The maturity of the source rocks varies greatly from one place to another.The highestmaturity ismainly located along the west part of the Dinan uplift and the northwest of theWucaiwan sag.While towards the south and the north of the area，the maturity presents a tendency ofdecreasing.A comprehensive analysis ofhydrocarbon reservoiring in the area is performed based on the thermal evolution of the source rocks and inclusion temperatures.The results indicate thathydrocarˉbons accumulated in different blocks at a certain sequence.Ranking according to the time of the first phase of accumulation，Wucaiwan is at the top of the list，followed by western Dinan，eastern Dinan，and finally northern Dinan.The distribution of hydrocarbons is controlled by the location and evolution of the source rocks aswell as the reservoiring sequence.