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珠江口盆地珠一坳陷发育3套烃源岩层系,自下而上有始新统文昌组、始新统—渐新统恩平组和渐新统珠海组。基于3套烃源岩层系的GR曲线资料,运用旋回地层分析方法(频谱分析技术及小波分析技术)实现了对珠一坳陷3套烃源岩层系天文周期的识别,并通过滤波技术精细计算了烃源岩沉积速率,得到2点基本认识:1珠一坳陷始新世—渐新世受天文周期影响,对应于天文周期(100ka偏心率周期、40ka斜率周期、20ka岁差周期),文昌组存在厚度为19.8m、9.1m、3.8m3种米兰科维奇旋回,恩平组存在厚度为17.0m、6.8m、3.4m3种米兰科维奇旋回,珠海组存在厚度为9.2m、4.1m、1.8m3种米兰科维奇旋回,其中偏心率周期的影响最为显著;2珠一坳陷3套烃源岩的沉积速率各自分布在一定的区间,不同沉积环境中烃源岩的沉积速率分布范围不同。文昌组中深湖相很好烃源岩沉积速率为8.50~14.00cm/ka,恩平组湖沼相好烃源岩沉积速率分布在8.00~15.50cm/ka之间,珠海组滨海相好烃源岩沉积速率分布在7.50~12.50cm/ka之间。
Three sets of source rock strata are developed in the Zhu 1 depression of the Pearl River Mouth Basin. From bottom to top there are the Eocene Wenchang Formation, the Eocene-Oligocene Enping Formation and the Oligocene Zhuhai Formation. Based on the GR curve data from three sets of source rock strata, the gyrocephalic stratum analysis method (spectrum analysis and wavelet analysis) is used to identify the astronomical periods of three sets of source rock strata in the Zhu 1 Depression. According to the depositional rate of source rocks, two basic understandings are obtained: 1 Eocene-Oligocene of Zhu 1 depression is affected by the astronomical period, corresponding to the astronomical period (100ka eccentricity period, 40ka slope period, 20ka precession period) The Milankovitch cycles of 19.8m, 9.1m and 3.8m thick exist in the group, and Milankovitch cycles of 17.0m, 6.8m and 3.4m thick exist in Enping Formation. The Zhuhai Formation has a thickness of 9.2m and 4.1m , And 1.8m3 kinds of Milankovitch cycles, of which the cycle of eccentricity has the most significant effect. The deposition rates of three sets of source rocks in the Zhuzilian depression are distributed in certain intervals. The sedimentary rate of source rocks in different depositional environments Different range. The sedimentary rate of hydrocarbon source rock in Wenchang Formation is 8.50-14.00cm / ka, and that of Enping Formation is between 8.00-15.50cm / ka. The sedimentary facies of source rocks in Zhuhai Formation The velocity distribution is between 7.50 ~ 12.50cm / ka.