东海西湖凹陷中央反转带花港组锆石特征及物源指示意义

发布时间：2018-12-11 00:52

【摘要】：西湖凹陷中央反转带花港组地层是东海陆架盆地最为重要的油气勘探目标区之一,但目前花港组物源体系研究较为薄弱,严重限制了砂体分布规律及储层研究的深入。通过对西湖凹陷中央反转带不同构造区主要钻井的花港组砂岩岩心样品分析,以锆石U-Pb定年为主要分析方法,同时结合地震反射特征,研究了中央反转带花港组砂体的物源特征。结果表明,中央反转带花港组大型砂体中发育前寒武纪、古生代及中生代3个年龄时期的锆石,其中前寒武纪锆石占绝对优势;大型砂体主要来自北部虎皮礁隆起的前寒武纪物源体系,砂体自北向南贯穿凹陷至南部构造区,同时受到西侧海礁隆起与东侧钓鱼岛隆褶带物源的影响,从而形成了北部为主、两侧为辅的物源格局。
[Abstract]:The Huagang formation in the central inversion zone of Xihu depression is one of the most important target areas for oil and gas exploration in the East China Sea shelf basin, but at present, the study of provenance system of Huagang formation is relatively weak, which seriously limits the distribution of sand bodies and the further study of reservoir. Based on the analysis of sandstone core samples of Huagang formation drilled in different structural areas in the central inversion zone of Xihu sag, zircon U-Pb dating is taken as the main analysis method and seismic reflection characteristics are combined. The provenance characteristics of sand bodies of Huagang formation in the central inversion zone are studied. The results show that zircons from Precambrian, Paleozoic and Mesozoic ages were developed in the large sand bodies of Huagang formation in the central inversion zone, of which the Precambrian zircon dominated. The large sand bodies mainly come from the Precambrian provenance system of the Hupi reef uplift in the north. The sand body runs through the depression to the southern structural area from north to south, and at the same time it is influenced by the provenance of the west reef uplift and the eastern Diaoyu island uplift belt, thus forming the north dominated. The material source pattern of the two sides is auxiliary.
【作者单位】：中海石油(中国)有限公司上海分公司;
【基金】：国家科技重大专项“东海深层低渗—致密天然气勘探开发技术”(2016ZX05027001) 国家自然科学基金(41672110)资助
【分类号】：P618.13

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