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利用区域露头资料、三维高精度地震资料和井筒岩电信息,开展了宏观水系分布、地震沉积充填结构、岩石成分、重矿物组合和锆石年龄等分析,研究琼东南盆地上中新统黄流组轴向水道成因及天然气成藏特征。黄流组轴向水道沉积具有两期沉积、多物源汇聚、重力流成因底流改造的特征。早期水道砂岩主要来自海南隆起西南部水系的陆源碎屑物,砂体规模小,地层超压。晚期水道砂岩主要来源于昆嵩隆起中部秋盆河等水系,沉积规模大、砂体连续性好、地层常压。轴向水道砂岩发育岩性-地层、岩性、构造-地层3种类型圈闭。早期水道内天然气以深部强超压驱动、沿裂隙垂向运移成藏为主,晚期水道内天然气以自西向东侧向运移成藏为主。
Based on the outcrop data, 3D high-precision seismic data and wellbore information, macroscopic water distribution, seismic sedimentary filling structure, rock composition, heavy mineral assemblages and zircon age were analyzed to study the characteristics of the Upper Miocene Huangtong Formation of Axial Channel and Characteristics of Gas Pooling. The axial flow channel deposition in the Huangliu Formation has the characteristics of two stages of sedimentation, convergence of multi-material sources and underflow reconstruction of gravity flow. Early channel sandstones mainly originated from terrigenous clastic materials in the southwestern part of Hainan uplift, with small sand bodies and overpressure of strata. The late channel sandstones mainly originated from the Qiuanshan River and other central rivers in the KunSong Uplift, with large sedimentary scale, good continuity of sand bodies and normal pressure of strata. Axial channel sandstone development lithology - strata, lithology, structure - strata 3 types of traps. In the early watercourse, the natural gas was driven by deep strong overpressure, migrating vertically along the fissures and reservoirs. The natural gas in the late channel mainly migrated from west to east for hydrocarbon accumulation.