琼东南盆地深水区双物源沉积模式及勘探前景
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摘要
基于新采集的地震资料,从物源供给模式入手,分析琼东南盆地南部陆坡区新生代地层的沉积层序、物源特征及其油气勘探前景。研究区具典型断陷-坳陷双层地质结构,表现南北向双物源特点。断陷期物源供给主要来自南部的西沙隆起和西南方向的中南半岛,同时还接受北部华南地块物源;拗陷期为以中南半岛物源供给为主。断陷期,南部沉积物在陵水组形成大规模前积体,并与北部物源形成的水下扇在凹陷中央交汇;拗陷期,三亚组发育大规模浊积水道,梅山组沉积期研究区东南方向发育较大规模的生物礁,黄流组沉积末期发育大规模下切谷。第四纪晚期,北部物源与南部物源在琼东南盆地深水区交汇。地震资料和盆地模拟显示,位于生烃凹陷上方的多期次水下扇和富砂浊积水道储集层,是良好的深水油气勘探目标。图7参19
Based on the newly collected seismic data and the provenance supply mode,the depositional sequence,provenance features and oil-gas exploration prospects were analyzed.The study area has the typical double-layer geologic structure of rift-depression,and has double provenance supply in the north and south.The provenance supply in rifting period was mainly from the southern Xisha Uplift and the southwestern Indo-China Peninsula,and was also from the northern South China Block;while the provenance supply in depression period was mainly from Indo-China Peninsula.In the rifting period,the southern sediment formed a large-scale progradation body in Lingshui Formation,and encountered the subsea apron formed by the northern provenance in the central depression;in the depression period,the large-scale turbidite channel developed in Sanya Formation,the large-scale reef developed in the southeast of the study area in Meishan Formation in the depositional stage,and the large-scale incised valleys developed in Huangliu Formation in the late depositional stage.In the Late Quaternary Period,the northern provenance and southern provenance joined in the deepwater area of Qiongdongnan Basin.The seismic data and basin modeling indicate that,the reservoirs of subsea apron and sand-rich turbidite channel above the hydrocarbon-generating sag can be the good exploration targets in the deepwater area.
Based on the newly collected seismic data and the provenance supply mode,the depositional sequence,provenance features and oil-gas exploration prospects were analyzed.The study area has the typical double-layer geologic structure of rift-depression,and has double provenance supply in the north and south.The provenance supply in rifting period was mainly from the southern Xisha Uplift and the southwestern Indo-China Peninsula,and was also from the northern South China Block;while the provenance supply in depression period was mainly from Indo-China Peninsula.In the rifting period,the southern sediment formed a large-scale progradation body in Lingshui Formation,and encountered the subsea apron formed by the northern provenance in the central depression;in the depression period,the large-scale turbidite channel developed in Sanya Formation,the large-scale reef developed in the southeast of the study area in Meishan Formation in the depositional stage,and the large-scale incised valleys developed in Huangliu Formation in the late depositional stage.In the Late Quaternary Period,the northern provenance and southern provenance joined in the deepwater area of Qiongdongnan Basin.The seismic data and basin modeling indicate that,the reservoirs of subsea apron and sand-rich turbidite channel above the hydrocarbon-generating sag can be the good exploration targets in the deepwater area.
引文
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[10]王振峰,何家雄.琼东南盆地中新统油气运聚成藏条件及成藏组合分析[J].天然气地球科学,2003,14(2):107-115.
[11]龚再升,杨甲明,郝芳,等.莺歌海盆地与琼东南盆地成藏条件的比较及天然气勘探方向[J].地球科学(中国地质大学学报),2001,26(3):284-290.
[12]Chen P H,Chen Z Y,Zhang Q M.Sequence stratigraphy andcontinental margin development of the northwestern shelf of theSouth China Sea[J].AAPG Bulletin,1993,77:842-862.
[13]陈志勇,张启明.南海北部大陆架西区陆坡的形成与演化[J].石油勘探与开发,1992,19(1):1-6.
[14]李绪宣,钟志洪,董伟良,等.琼东南盆地古近纪裂陷构造特征及其动力学机制[J].石油勘探与开发,2006,33(6):713-721.
[15]史淑玲,魏魁生,石玉军.南海盆地宝岛—松涛凹陷低位体系域时空组合特征及其与油气赋存关系[J].石油勘探与开发,2004,31(4):32-35.
[16]姜涛.莺歌海—琼东南盆地区中中新世以来低位扇体形成条件和成藏模式[D].武汉:中国地质大学(武汉),2005.22-40.
[17]陶维祥,何仕斌,赵志刚,等.琼东南盆地深水区储层分布规律[J].石油实验地质,2006,28(6):554-559.
[18]XIE X N,Müller R D,LI S T,et al.Origin of anomaloussubsidence along the Northern South China Sea margin and itsrelationship to dynamic topography[J].Marine and PetroleumGeology,2006,23(7):745-765.
[19]WU S G,YUAN S Q,ZHANG G C,et al.Seismiccharacteristics of a reef carbonate reservoir and implications forhydrocarbon exploration in deep water of the QiongdongnanBasin,northern South China Sea[J].Marine and PetroleumGeology,in press.(doi:10.1016/j.marpetgeo.2008.04.008.)
[2]杨川恒,杜栩,潘和顺,等.国外深水领域油气勘探新进展及我国南海北部陆坡深水区油气勘探潜力[J].地学前缘,2000,7(3):247-256.
[3]Pettingill H S,Weimer P.World wide deep water exploration andproduction:past,present and future[J].The Leading Edge,2002,21(4):371-376.
[4]Weimer P,Slatt R M,Pettingill H S.Global overview ofdeepwater exploration and production[A].Weimer P,Slatt R M.Petroleum systems of deepwater settings[C].Tulsa:SEG,2004.21-39.
[5]郑晓东,朱明,何敏,等.珠江口盆地白云凹陷荔湾深水扇砂体分布预测[J].石油勘探与开发,2007,34(5):529-533.
[6]何家雄,夏斌,孙东山,等.琼东南盆地油气成藏组合、运聚规律与勘探方向分析[J].石油勘探与开发,2006,33(1):53-58.
[7]林畅松,刘景彦,蔡世祥,等.莺-琼盆地大型下切谷和海底重力流体系的沉积构成和发育背景[J].科学通报,2001,46(1):69-72.
[8]刘军,王华,姜华,等.琼东南盆地深水区油气勘探前景[J].新疆石油地质,2006,27(5):545-548.
[9]黄保家.琼东南盆地天然气潜力及有利勘探方向[J].天然气工业,1999,19(1):34-39.
[10]王振峰,何家雄.琼东南盆地中新统油气运聚成藏条件及成藏组合分析[J].天然气地球科学,2003,14(2):107-115.
[11]龚再升,杨甲明,郝芳,等.莺歌海盆地与琼东南盆地成藏条件的比较及天然气勘探方向[J].地球科学(中国地质大学学报),2001,26(3):284-290.
[12]Chen P H,Chen Z Y,Zhang Q M.Sequence stratigraphy andcontinental margin development of the northwestern shelf of theSouth China Sea[J].AAPG Bulletin,1993,77:842-862.
[13]陈志勇,张启明.南海北部大陆架西区陆坡的形成与演化[J].石油勘探与开发,1992,19(1):1-6.
[14]李绪宣,钟志洪,董伟良,等.琼东南盆地古近纪裂陷构造特征及其动力学机制[J].石油勘探与开发,2006,33(6):713-721.
[15]史淑玲,魏魁生,石玉军.南海盆地宝岛—松涛凹陷低位体系域时空组合特征及其与油气赋存关系[J].石油勘探与开发,2004,31(4):32-35.
[16]姜涛.莺歌海—琼东南盆地区中中新世以来低位扇体形成条件和成藏模式[D].武汉:中国地质大学(武汉),2005.22-40.
[17]陶维祥,何仕斌,赵志刚,等.琼东南盆地深水区储层分布规律[J].石油实验地质,2006,28(6):554-559.
[18]XIE X N,Müller R D,LI S T,et al.Origin of anomaloussubsidence along the Northern South China Sea margin and itsrelationship to dynamic topography[J].Marine and PetroleumGeology,2006,23(7):745-765.
[19]WU S G,YUAN S Q,ZHANG G C,et al.Seismiccharacteristics of a reef carbonate reservoir and implications forhydrocarbon exploration in deep water of the QiongdongnanBasin,northern South China Sea[J].Marine and PetroleumGeology,in press.(doi:10.1016/j.marpetgeo.2008.04.008.)
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