琼东南盆地南部中新统生物礁的识别
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摘要
琼东南盆地南部地区在新近纪中新世梅山组沉积时期具有适合生物礁发育的古地理条件。近来在该区域采集的地震资料发现在梅山组地层存在典型的丘状反射,主要分布在古隆起上,底平顶凸,顶底界面清晰,反射能量强,内部具前积或杂乱反射,两翼见上超,顶部为披覆沉积,波阻抗值为(8~10)×106kg/(m2.s),目前初步研究认为该套地层为生物礁建造。文章还从区域沉积背景、丘状体发育部位以及地震反射特征等方面对生物礁和泥构造两类地震反射异常体加以分析和对比,排除梅山组发育泥底劈的可能性。
The southern part of the Qiongdongnan Basin was suitable for reef generation when the Meishan Formation deposited during Miocene.Seismic data collected in this region during the past few years have indicated that the Meishan Formation is characterized by typical mound reflection,mainly on ancient uplifts.The formation is flat at the bottom and convex at the top.There is clear boundary between top and bottom.The reflection is strong.Progradational or random reflection exists in the formation,while on the 2 flanks there is onlapping,and on the top there is drape.The wave impendence value is(8-10)×106 kg/(m2·s).The formation is regarded as reef according to present studies.Comparisons between reef and mud structure have been carried out based on the studies of regional sedimentary background,mound structure generation location and seismic reflection characteristics,indicating that it is impossible for shale diapire generation in the formation.
The southern part of the Qiongdongnan Basin was suitable for reef generation when the Meishan Formation deposited during Miocene.Seismic data collected in this region during the past few years have indicated that the Meishan Formation is characterized by typical mound reflection,mainly on ancient uplifts.The formation is flat at the bottom and convex at the top.There is clear boundary between top and bottom.The reflection is strong.Progradational or random reflection exists in the formation,while on the 2 flanks there is onlapping,and on the top there is drape.The wave impendence value is(8-10)×106 kg/(m2·s).The formation is regarded as reef according to present studies.Comparisons between reef and mud structure have been carried out based on the studies of regional sedimentary background,mound structure generation location and seismic reflection characteristics,indicating that it is impossible for shale diapire generation in the formation.
引文
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[16]孙昶旭,崔永刚,罗文生,等.东营凹陷东营三角洲与中央隆起带盐—泥构造形成的关系及其对隐蔽油气藏勘探的意义[J].石油地球物理勘探,2006,41(4):462-467.
[2]龚再升,李思田,谢泰俊,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997.
[3]李绪宣,朱光辉.琼东南盆地断裂系统及其油气输导特征[J].中国海上油气,2005,17(1):127.
[4]许红,蔡峰,王玉净,等.西沙中新世生物礁演化与藻类的造礁作用[J].科学通报,1999,44(13):1435-1439.
[5]邱燕,王英民.南海第三纪生物礁分布与古构造和古环境[J].海洋地质和第四纪,2001,21(1):65-73.
[6]陈平,陆永潮,许红.南沙海域第三纪生物礁层序构成和演化[J].地质科学,2003,38(4):514-518.
[7]龚再升.生物礁是南海北部深水区的重要勘探领域[J].中国海上油气,2009,21(5):289-295.
[8]魏喜,邓晋福,谢文彦,等.南海盆地演化对生物礁的控制及礁油气藏潜力分析[J].地学前缘,2005,12(3):245-252.
[9]刘春兰,冯正祥.宝岛23-1构造生物礁地质评价[J].中国海上油气,2001,15(3):171-175.
[10]Sattler U,Zampetti V,Schlager W,et al.Late Leachingunder deep burial conditions:a case study from the MioceneZhujiang Carbonate Reservoir,South China Sea[J].Marineand Petroleum Geology,2004,21(8):977-992.
[11]Erlich R N,Barrett S F,Guo Baiju.Seismic and geologicalcharacteristics of drowning events on carbonate platforms[J].AAPG Bulletin,1990,74:1523-1537.
[12]吴时国,袁圣强,董冬冬,等.南海北部深水区中新世生物礁发育特征[J].海洋与湖沼,2009,40(2):117-121.
[13]郝芳,李思田,龚再升,等.莺歌海盆地底辟发育机制与流体幕式充注[J].中国科学D辑,2001,31(6):471-476.
[14]何家雄,夏斌,刘宝明,等.莺歌海盆地泥底辟热流体上侵活动与天然气及CO2运聚规律剖析[J].石油实验地质,2004,26(4):349-358.
[15]王家豪,庞雄,王存武,等.珠江口盆地白云凹陷中央底辟带的发现及识别[J].地球科学——中国地质大学学报,2006,31(2):209-213.
[16]孙昶旭,崔永刚,罗文生,等.东营凹陷东营三角洲与中央隆起带盐—泥构造形成的关系及其对隐蔽油气藏勘探的意义[J].石油地球物理勘探,2006,41(4):462-467.
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