莺歌海盆地深部油气储层物源识别：陵水组-梅山组碎屑锆石U-Pb年龄和Hf-O同位素制约

莺歌海盆地是一个位于南海北部大陆边缘的大型走滑-伸展型盆地。其新生代沉积物源复杂多样，辨识难度非常大，给深海优质储层的寻找和预测带来很大困难。深海优质油气储层物源研究历来是深海油气研究的关键问题和重要课题。本次研究将通过盆地不同油气构造区陵水组-梅山组重砂矿物、碎屑沉积岩地球化学以及关键层位碎屑锆石LA-ICPMS U-Pb年代学和Hf-O同位素测试分析，并结合源区地质演化的系统性综合分析和研究，建立莺歌海盆地源区的识别标志，确定莺歌海盆地不同油气构造区深部储层物质来源，并建立深部油气储层的重砂矿物、地球化学和碎屑锆石年龄频谱特征图，从而认识莺歌海盆地周边物源体系对盆地的贡献及其来源路径，提出有关新生代莺歌海盆地形成动力学演化模型，了解深海有利油气储层的分布范围和方向，为深海油气勘探提供科学依据。

Yinggehai Basin, a large Cenozoic strike-slip and extensional basin, is located on the northern margin of the South China Sea continental shelf. It’s very difficult to identify the sediment provenance of this basin as it has several source regions hindering the prediction and exploration of the high quality reservoirs. However, investigating the provenance of high quality reservoirs is significant for deep-sea oil and gas exploration. In this study, multiple methods will be employed including investigation of the heavy minerals, whole-rock geochemistry, LA-ICPMS U–Pb ages and Hf–O isotopes of detrital zircon from the Oligoene Lingshui to Miocene Meishan formation sedimentary rocks in different gas fields of Yinggehai Basin. Combined with the study of regional geological evolution, we will build the signatures of the potential source regions, and determine the provenance and establish the characteristic spectrums of the deep-sea oil and gas reservoirs via the heavy minerals, geochemistry and age of detrital zircons. These results will serve as a foundation to help us evaluate the contribution and transportation route of the surrounding source areas, build the dynamic evolution model, understand the distribution and direction of the promising reservoirs, and provide useful guide for deep-sea oil and gas exploration in Yinggehai Basin.