西湖凹陷平湖組物源分析
[Abstract]:Whether there is an east provenance in Pinghu formation in Xihu sag is controversial, and the determination of the east provenance is of great significance to oil and gas exploration. Based on the data of drilling, earthquake and analysis, this paper analyzes the heavy mineral ZTR index, sandstone type, cuttings composition, sandstone percentage, seismic facies and synsedimentary structural characteristics of the sediments of Pinghu formation in Xihu sag. It is found that the ZTR index of terrestrial heavy minerals and the maturity of sandstone components in Pinghu formation are characterized by "low on both sides of the depression and high in the middle", while the percentage content of siderite and sandstone in the authigenic heavy minerals is "high on both sides of the depression and low in the middle". From the seismic reflection characteristics, it can be seen that the Pinghu formation has obvious chaotic reflection at the edge of the basin and the proproduct reflection configuration indicating the existence of the provenance on the east side of the basin. Moreover, the existence of the growth anticlinal in the middle and late Pinghu formation further confirms the existence of the uplift fold belt in the eastern part of the sedimentary period of Pinghu formation from the aspect of tectonic stress. Based on the above studies, it is considered that the eastern uplift fold belt has been uplift in the sedimentary period of Pinghu formation and is used as the eastern source of Xihu sag, and the deep Pinghu formation in the middle and east of Xihu sag has a good prospect of oil and gas exploration.
【作者單位】: 中國石油集團(tuán)長城鉆探工程有限公司解釋研究中心;中海石油(中國)有限公司上海分公司;中國石化上海海洋油氣分公司研究院;中國石油天然氣管道局國際事業(yè)部;浙江大學(xué)海洋學(xué)院;
【分類號】:P618.13
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