| 琼东南盆地松南低凸起古近系构造-沉积演化特征与天然气成藏 |
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| 引用本文： | 周杰,杨希冰,杨金海,甘军,吴昊,何小胡,胡斌.琼东南盆地松南低凸起古近系构造-沉积演化特征与天然气成藏[J].地球科学,2019,44(8):2704-2716. |
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| 作者姓名： | 周杰 杨希冰 杨金海 甘军 吴昊 何小胡 胡斌 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司, 广东湛江 524057 |
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| 基金项目： | 国家科技重大专项:琼东南盆地深水区大中型气田形成条件及勘探关键技术2016ZX05026-002 |
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| 摘 要： | 为了明确松南低凸起区构造沉积演化特征及对天然气成藏的意义.基于区域长剖面精细解释，利用最新的钻井、测井、地震资料，分析了松南低凸起及围区古近系构造格局、斜坡类型及演化特征、沉积特征及与天然气成藏的关系.结果表明，松南低凸起主要受北部2号、12号断裂，南部11号、10号断裂活动控制，古近纪经历了:“（1）差异翘倾抬升，西高东低；（2）加速翘倾抬升，向东抬升”这2个阶段，并以发育旋转掀斜斜坡为主.古地貌具有“隆凹相间”与“西高东低”的特征.断裂活动及翘倾抬升作用控制了物源区的分布、缓坡沉积格局及输砂通道，在东突起上发育了缓坡带扇三角洲沉积.大面积分布的扇三角洲发育了优质的储集体，构造活动形成了多种类型的圈闭，天然气生、运、聚时空匹配良好，松南低凸起古近系有望成为琼东南盆地下一个千亿方级的天然气聚集区.
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| 关 键 词： | 琼东南盆地 松南低凸起 构造演化 沉积演化 天然气 |
| 收稿时间： | 2019-01-21 |
Structure-Sedimentary Evolution and Gas Accumulation of Paleogene in Songnan Low Uplift of the Qiongdongnan Basin |
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| Abstract: | Based on the detailed interpretation of regional long section and the latest drilling, logging and seismic data, the Paleogene structural pattern, slope type and its evolution characteristics, sedimentary characteristics and their relationship with gas accumulation in Songnan low uplift (SLU)and surrounding areas are analyzed.The purpose is to clarify the tectonic and sedimentary evolution characteristics of the SLU and its influence on gas accumulation. The results show that the SLU is mainly controlled by the No.2 & No.12 faults in the north and No.11 & No.10 faults in the south. The SLU experienced two stages, namely, the differential updip uplift characterized by the "high in the west and low in the east " and the accelerated eastward updip uplift. And it was dominated by the development of rotational lift ramp in the Paleogene. The paleogeomorphology has the characteristics of "alternation of uplift and depression" and "high in the west and low in the east" in study area. The faults activity and uplift of upwarping controlled the distribution of material source area, sedimentary pattern of gentle slope and sand transport channel, so fans delta deposit developed in the gentle slope zone on the western bulge. The wide distribution of fan deltas formed high quality reservoir, and the tectonic activity formed many types of traps. The gas generation, transportation and accumulation are well matched in space and time in the SLU Therefore, the Paleogene of SLU is expected to be the next gas accumulation area of about 100 billion cubic meters in the Qiongnan Basin. |
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