井震结合深水区物源分析——以琼东南盆地深水区古近系陵水组为例

Material source analysis in deep water area based on well-to-seismic integrated studies,a case study on Lingshui Formation of Paleogene in deep water area in southeast Hainan Basin of South China Sea

根据琼东南盆地有限的地质资料,采用邻区浅水区钻井资料与深水区地震资料相结合的方法,建立了琼东南盆地深水区陵水组三维等时层序地层格架。在此基础上结合盆地区域地质概况和前人对琼东南盆地物源分析所做的工作,充分运用浅水区岩心观察描述的岩性序列特征及深水区地震剖面上前积反射等地震反射指向特征,并综合沉积相和地震反演砂体预测研究成果,对古近系陵水组物源发育状况进行了分析。结果表明,浅水区发育来自海南岛上的区域性大范围物源;深水区陵水组发育来自南部永乐隆起上区域性大范围物源,与此同时在局部高部位也存在一些小范围的剥蚀区,这些剥蚀区提供了呈放射状由高部位指向低部位的局部物源。在物源分析的基础上推断了扇三角洲、滩坝及浊积扇等有利砂体可能存在的区域。

With the limited geological information in southeast Hainan Basin and by jointly utilizing drilling date in nearby shallow area and the seismic data in deep water area,a 3D isochrone sequence stratigraphic framework for Lingshui Formation in deep water area of southeast Hainan Basin was established.By integrating the regional geology in the basin and the related works done before,fully utilizing the lithology sequence characteristics from the observation of shallow water cores and the seismic progradation reflection characteristics on seismic sections in deep water area,and summarizing study results on sedimentary facies and seismic inversion sand-body prediction,the material source development status of the Lingshi Formation in Paleogene was analyzed in this paper.The study results indicate that the development in shallow area was from the large range material source in Hainan Island,while the development of the Lingshui Formation from the south to the north in deep water was from the large range material source on Yongle Uplift in the south,meantime some small eroded areas exist in local high positions,those eroded areas provide local material source which was radially distributed from high positions to low positions.Based on the material source analysis in this paper the possible distribution areas for the favorable sand-bodies,such as fan delta,beach bar and turbidite fan,were inferred.