变异老鼠琼东南盆地南部早中新世碳酸盐岩台地的地震解释-海洋学报英文版

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琼东南盆地南部早中新世碳酸盐岩台地的地震解释-海洋学报英文版艾萨拉之爪


Seismic analysis of early-mid Miocene carbonate platform in the southern Qiongdongnan Basin, South China Sea
Author
WU Xiaochuan State Key Laboratory of Continental Dynamics,Department of Geology数字广大 , Northwest University, Xi'an, China
PU RenhaiState Key Laboratory of Continental Dynamics, Department of Geology梁成恩 ,Northwest University伊天照 , Xi'an百炼焚仙 , China
CHEN YingCNNOOC Research Institute薛小冉 , Beijing, China
QU HongjunState Key Laboratory of Continental Dynamics, Department of Geology木下优树菜 ,呆宝静 Northwest University, Xi'an, China
SHEN Huailei CNNOOC Research Institute, Beijing青海一枭 , China
Abstract:The southern uplift of the Qiongdongnan Basin is a deepwater area in which no wells have beens drilled. The Miocene-Quaternary strata in the Xisha Islands夭水无邪 , which are located 40-100 km to the south, are composed of carbonate reef formations. Paleotectonic and paleogeographic analyses of the basin suggest that the southern uplift experienced favorable geological conditions for the development of carbonate reefs during the Miocene. The high-impedance carbonates have high amplitudes and low frequencies on seismic profiles. The reefs are distributed on paleotectonic highs and are thicker than the contemporaneous formations. A forward model of the variation in carbonate thickness based on lithological and velocity information from wells in nearby regions can simulate the seismic response of carbonates with different thicknesses. We identified several important controlling points for determining the thickness of carbonates from seismic profiles, including the pinchout point周鸿伟, theλ/4 thickness point宋世鹏 , and theλ/2 thickness point. We depict a carbonate thickness map in the deepwater area of the southern Qiongdongnan Basin based on this model. The carbonate thickness map杨忠宝 , the paleotectonic and paleogeographic background济公戏嫦娥 , and the seismic response characteristics of reefs suggest that the carbonates that developed on the southern uplift of the Qiongdongnan Basin during the Miocene were mainly an isolated carbonate platform peninsula and ramp deposits. It consisted of gentle ramp platform, steep slope platform网游审判 , platform depression, gravity flow, and reef bank facies.
Key words:forward modelcarbonate rockthicknessfacies distributionQiongdongnan Basin

WU Xiaochuan,PU Renhai林湘萍老公 ,CHEN Ying月迅龙 ,QU Hongjun,SHEN Huailei. 2018. Seismic analysis of early-mid Miocene carbonate platform in the southern Qiongdongnan Basin变异老鼠 铁幕1925 , South China Sea. Acta Oceanologica Sinica承欢格格, (2):54-65
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