WU Xiaochuan, PU Renhai, CHEN Ying, QU Hongjun, SHEN Huailei. Seismic analysis of early-mid Miocene carbonate platform in the southern Qiongdongnan Basin, South China Sea[J]. Acta Oceanologica Sinica, 2018, 37(2): 54-65. doi: 10.1007/s13131-017-1128-6
Citation: WU Xiaochuan, PU Renhai, CHEN Ying, QU Hongjun, SHEN Huailei. Seismic analysis of early-mid Miocene carbonate platform in the southern Qiongdongnan Basin, South China Sea[J]. Acta Oceanologica Sinica, 2018, 37(2): 54-65. doi: 10.1007/s13131-017-1128-6

Seismic analysis of early-mid Miocene carbonate platform in the southern Qiongdongnan Basin, South China Sea

doi: 10.1007/s13131-017-1128-6
  • Received Date: 2016-10-30
  • Rev Recd Date: 2011-10-07
  • 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, 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, the λ/4 thickness point, and the λ/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, the paleotectonic and paleogeographic background, 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, platform depression, gravity flow, and reef bank facies.
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