Structure-Sedimentary Evolution and Gas Accumulation of Paleogene in Songnan Low Uplift of the Qiongdongnan Basin
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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.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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Key words:
- Qiongdongnan Basin /
- Songnan low uplift /
- structure evolution /
- sedimentary evolution /
- gas
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图 1 琼东南盆地构造纲要
Fig. 1. Tectonic framework of the Qiongdong Basin showing the study area, seismic dataset, faults
图 5 始新统-陵水组沉积厚度图与2号11号断裂叠合图
Fig. 5. Overlaping map of thickness of Eocene-Lingshui formation, NO.2 and NO.11 faults activity rate
图 6 松南低凸起早渐新世晚期崖城组古地貌图与典型地震剖面
Fig. 6. Paleogeomorphologic map and typical seismic profile of the Yacheng formation in the late Early Oligocene of Songnan low uplift
图 7 Y-1井崖城组扇三角洲岩电特征
Fig. 7. Fan delta rock and log characteristics of Yacheng formation, Y-1
图 8 过松南低凸起扇三角洲典型地震剖面(剖面位置见图 1)
Fig. 8. Typical seismic profile off an delta in the Songnan Low Uplift
图 9 松南低凸起崖城组-陵水组沉积相
Fig. 9. Sedimentary facies map of Yacheng formation and Lingshui formation of the Songnan low uplift
图 10 断层差异旋转翘倾缓坡带控三角洲沉积模式
Fig. 10. Deltaic sedimentation model controlled by fault differential rotation tilting gentle slope zone
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