珠江口盆地NSQ2陆架边缘三角洲的识别标志及沉积模式
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摘要
陆架边缘三角洲是根据相对海平面变化进行分类的一种三角洲类型,是指发育于大陆架边缘、越过大陆坡折向陆坡延伸的三角洲。借助岩心资料、测井曲线和地震剖面等资料,对珠江口盆地NSQ2低位域的沉积物进行了分析,认为此时存在陆架边缘三角洲。因为从地震剖面上可见前积体越过陆架坡折继续向盆地进积,形成向海和向陆减薄的楔形体;从岩心上可见砂泥岩交互的三角洲前缘前端的滑塌体和以浊积水道沉积为主的重力流沉积;在测井曲线上,可见典型的漏斗形,为三角洲前缘河口坝-远沙坝序列及块状箱形重力流水道;在平面上,其砂厚图主要呈弓形或新月形状。综合这些特征认为NSQ2低位时期发育陆架边缘三角洲,并且总结了该地区的稳定的陆架边缘三角洲沉积模式。
Shelf-margin delta is a new type of delta classified by the relative sea level change.It means that the delta develops on the shelf-margin,passes the shelf break and extends to the slope.The authors analyse the sediments in the LST of NSQ2 in the Pearl River Mouth basin and consider that there exists a shelf-margin delta based on the cores,well logs and seismic data.People can see that foresets progress toward the basin,forming a thinning wedge towards to the land and the basin in the seismic section,the slumps with the sandstone-mudstone interbeds on the front end in the front of delta and gravity flow deposits mainly consisting of turbidity channel deposits in cores,the typical funnel-shaped and box-like gravity flow channels indicating mouth bars and far sand bars in GR curves,and the arcuate or crescent sand isopach map in a plan.All of these indicate a shelf-margin delta exists in the LST of NSQ2.Also,a stable shelf-margin delta model is summarized.
Shelf-margin delta is a new type of delta classified by the relative sea level change.It means that the delta develops on the shelf-margin,passes the shelf break and extends to the slope.The authors analyse the sediments in the LST of NSQ2 in the Pearl River Mouth basin and consider that there exists a shelf-margin delta based on the cores,well logs and seismic data.People can see that foresets progress toward the basin,forming a thinning wedge towards to the land and the basin in the seismic section,the slumps with the sandstone-mudstone interbeds on the front end in the front of delta and gravity flow deposits mainly consisting of turbidity channel deposits in cores,the typical funnel-shaped and box-like gravity flow channels indicating mouth bars and far sand bars in GR curves,and the arcuate or crescent sand isopach map in a plan.All of these indicate a shelf-margin delta exists in the LST of NSQ2.Also,a stable shelf-margin delta model is summarized.
引文
[1]于兴河.碎屑岩系油气储层沉积学[M].北京:石油工业出版社,2008:339-344.
[2]Porbski S J,Steel R J.Shelf-margin deltas:their stratigraphic significance and relation to deepwater sands[J].Earth-Science Reviews,2003,62:83-326.
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[4]施和生,杨少坤.珠江口盆地大型礁油田地质特征[C]//21世纪中国油气勘探国际研讨会论文集.北京:地质出版社,2002:334-338.
[5]侯国伟,于兴河,客伟利,等.番禺低隆起东区中新世早—中期沉积演化特征[J].石油天然气学报,2005,27(1):26-28.
[6]邵磊,雷永昌,庞雄,等.珠江口盆地构造演化及对沉积环境的控制作用[J].同济大学学报:自然科学版,2005,33(9):1177-1181.
[7]侯国伟,于兴河,客伟利,等.番禺低隆起东区中新世早—中期沉积演化特征[J].石油天然气学报,2005,27(1):26-28.
[8]施和生,李文湘,邹晓萍,等.层序地层学在珠江口盆地(东部)油田开发中的应用[J].中国海上油气:地质,2000,14(1):16-20.
[9]黎明碧,金翔龙,初凤友,等.神狐—一统暗沙隆起中部新生代地层层序划分及沉积演化[J].沉积学报,2002,20(4):545-551.
[10]吴景富,徐强,祝彦贺.南海白云凹陷深水区渐新世-中新世陆架边缘三角洲形成及演化[J].地球科学:中国地质大学学报,2010,35(4):681-690.
[11]郭秀蓉,武强,邱燕,等.南海曾母盆地南部陆架边缘三角洲沉积特征[J].海洋地质与第四纪地质,2006,26(4):1-6.
[12]Mayall M J.陆架边缘三角洲墨西哥湾密西西比谷109区块中上新统的一个实例[J].海洋石油,1993,4:52-60.
[13]Suter J R,Berryhill Jr H L.Late Quaternary shelf-margin deltas,northwest Gulf of Mexico[J].AAPG Bulletin,1985,69(1):77-91.
[14]李通艺,郝梓国.南海的构造演化[J].海洋地质译丛,1993,12(4):75-83.
[15]崔莎莎,何家雄,陈胜红,等.珠江口盆地发育演化特征及其油气成藏地质条件[J].天然气地球科学,2009,20(3):384-391.
[2]Porbski S J,Steel R J.Shelf-margin deltas:their stratigraphic significance and relation to deepwater sands[J].Earth-Science Reviews,2003,62:83-326.
[3]武强,解习农,姜涛.陆架边缘三角洲的研究现状及其意义[J].海洋地质动态,2005,21(3):1-5.
[4]施和生,杨少坤.珠江口盆地大型礁油田地质特征[C]//21世纪中国油气勘探国际研讨会论文集.北京:地质出版社,2002:334-338.
[5]侯国伟,于兴河,客伟利,等.番禺低隆起东区中新世早—中期沉积演化特征[J].石油天然气学报,2005,27(1):26-28.
[6]邵磊,雷永昌,庞雄,等.珠江口盆地构造演化及对沉积环境的控制作用[J].同济大学学报:自然科学版,2005,33(9):1177-1181.
[7]侯国伟,于兴河,客伟利,等.番禺低隆起东区中新世早—中期沉积演化特征[J].石油天然气学报,2005,27(1):26-28.
[8]施和生,李文湘,邹晓萍,等.层序地层学在珠江口盆地(东部)油田开发中的应用[J].中国海上油气:地质,2000,14(1):16-20.
[9]黎明碧,金翔龙,初凤友,等.神狐—一统暗沙隆起中部新生代地层层序划分及沉积演化[J].沉积学报,2002,20(4):545-551.
[10]吴景富,徐强,祝彦贺.南海白云凹陷深水区渐新世-中新世陆架边缘三角洲形成及演化[J].地球科学:中国地质大学学报,2010,35(4):681-690.
[11]郭秀蓉,武强,邱燕,等.南海曾母盆地南部陆架边缘三角洲沉积特征[J].海洋地质与第四纪地质,2006,26(4):1-6.
[12]Mayall M J.陆架边缘三角洲墨西哥湾密西西比谷109区块中上新统的一个实例[J].海洋石油,1993,4:52-60.
[13]Suter J R,Berryhill Jr H L.Late Quaternary shelf-margin deltas,northwest Gulf of Mexico[J].AAPG Bulletin,1985,69(1):77-91.
[14]李通艺,郝梓国.南海的构造演化[J].海洋地质译丛,1993,12(4):75-83.
[15]崔莎莎,何家雄,陈胜红,等.珠江口盆地发育演化特征及其油气成藏地质条件[J].天然气地球科学,2009,20(3):384-391.
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