琼东南盆地深水区松南—宝岛凹陷的构造演化及其与油气成藏关系  

Tectonic Evolution of Songnan-Baodao Sag in Qiongdongnan Basin and Its Relationship with Oil-gas Reservoir

作　　者：汪锴 王根厚[2] 贾庆军 张笑 WANG Kai;WANG Genhou;JIA Qingjun;ZHANG Xiao(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Xuehua Petroleum Technology Company Limited,Beijing 100088,China;Offshore Production Plant of Shengli Oilfield of Sinopec,Dongying,Shandong 257237,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]北京雪桦石油技术有限责任公司,北京100088 [4]中国石化胜利油田海洋采油厂,山东东营257237

出　　处：《现代地质》2023年第2期245-258,共14页Geoscience

基　　金：国家重大科技专项项目(2016ZX05026-007-002)。

摘　　要：松南—宝岛凹陷是琼东南盆地继崖城—陵水凹陷之后又一个具有巨大油气勘探开发潜力的重要勘探区,其构造演化、构造样式和原型盆地恢复对油气成藏规律的认识具有重要意义。在地震资料解释的基础上,运用平衡剖面与构造解析技术剖析了松南—宝岛凹陷的构造演化期次、构造样式的展布规律,并恢复了古近纪原型盆地特征。研究结果表明:松南—宝岛凹陷的构造-沉积演化可划分为前裂谷期、同裂谷期和后裂谷期3个时期6个阶段,所形成的构造样式可归纳为同期变形样式、同期样式组合与多期样式组合3大类14小类。研究区的古近纪原型盆地可恢复出8个箕状断陷沉积,沉积厚度3000~6000 m,可识别出强烈改造区、中等改造区和弱改造区三类古近纪原型盆地的保存状况,局部剥蚀厚度超过5000 m。松南—宝岛凹陷的油气运移特征表现为近源→高成熟→晚期成藏,其周缘的松涛凸起、陵水低凸起和松南凸起既是油气运移的指向区,又发育有与大规模生烃期相匹配的潜山-披覆构造、地层岩性以及反转背斜等有效圈闭,是油气勘探的有利区带。The Songnan-Baodao depression is an important exploration area with great oil-gas exploration and development potential in the Qiongdongnan Basin(after the Yacheng-Lingshui Depression),and its tectonic evolution,tectonic style and prototype basin restoration are of great significance to understand the oil and gas accumulation regularities.Based on seismic data interpretation,we used 2DMove software to analyze the tectonic evolution period and the spread regularities of tectonic patterns of the Songnan-Baodao depression,and restored the characteristics of Paleogene prototype basins.The results show that the tectonic-sedimentary evolution of the Songnan-Baodao depression can be divided into six stages in three periods(pre-rift,syn-rift and post-rift),and the structural styles comprise three major categories and 14 sub-categories of simultaneous deformation styles,and simultaneous style and multistage style assemblages.Eight dustpan-like fault deposits were recovered in the local Paleogene prototype basins,with sediment thickness of 3,000-6,000 m.Preservation status of the three types of Paleogene prototype basins in the strong,medium and weak transformation areas were identified,and the local erosion thickness exceeds 5,000 m.The oil and gas transport characteristics of the Songnan-Baodao depression are characterized by source proximal,high maturity and late accumulation,and the Songtao bulge,Lingshui low bulge and Songnan bulge at the periphery represent both the oil-gas transport directional zones and effective traps of buried-hill and nappe structure,stratigraphic lithology,and inverted anticline.accumulation match the large-scale hydrocarbon generation period,which are favorable for oil and gas exploration.

关 键 词：构造演化 构造样式 原型盆地 成藏特征 松南—宝岛凹陷 

分 类 号：P642[天文地球—工程地质学]