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。图7参11
谢玉洪
,
李绪深
,
范彩伟
,
谭建财
,
刘昆
,
鲁怡
,
胡雯燕
,
李虎
,
吴洁
. 琼东南盆地上中新统黄流组轴向水道源汇体系与天然气成藏特征[J]. 石油勘探与开发, 2016
, 43(4)
: 521
-528
.
DOI: 10.11698/PED.2016.04.03
Based on the data of regional outcrop observation, high-precision 3-D seismic detection and wellbore rock-electricity, this paper researched macro-water distribution, seismic architecture of sedimentary-filling, rock composition, heavy mineral assemblage, and zircon age. The axial channel provenance system and accumulation of natural gas of the Upper Miocene Huangliu Formation in the Qiongdongnan Basin was analyzed. The research showed that axial channels deposits were provided with two depression stages, multiple provenances, and gravity flows by bottom current rework. Early channels sandstone with small size and formation overpressure was mainly from terrigenous material of southwest drainage system in Hainan uplift, while Qiupen River in the central Kunsong uplift was the primary provenance of late channels sandstone with large scale of sediments, good continuity and normal formation pressure. There are three types of axial channel sandstone traps: litho-stratigraphic, lithologic and tectono-stratigraphic trap. Natural gas of early channels was driven by deep overpressure and vertically migrated into reservoir along fissures, while natural gas of late channels lateral migrated from west to east.
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