Seismic interpretation and hydrocarbon accumulations implication of the Miocene Meishan Formation reefs in southern Qiongdongnan Basin, northern South China Sea
a Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, Shaanxi, China; b Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi’an 710054, Shaanxi, China; c Geological Research Center of Orogenic Belt, China Geological Survey, Xi’an 710054, Shaanxi, China; d Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China; e Research Center of CNOOC (China), Beijing 100010, China
Abstract Numerous moundy reflections were found at the Upper Meishan Formation in southern Qiongdongnan Basin, South China Sea which are suspected reefs. However, no common understanding on the seismic and geologic interpretation was acquired. Based on seismic reflection identification, geometrical configuration description, wave impedance inversion, forward simulation, analysis of reef-building sedimentary environments and pseudomorph identification, these suspected-reef moundy reflections were studied in details. Three types of reefs were recognized, i.e., patch reef, platform-edge reef, and pinnacle reef. They have some typical characteristics of reefs, including moundy or lenticular shape, clear outline with crest and canal, internal foreset bedding, bidirectional uplap between limbs, and strong reflection at top and bottom. The patch reefs are of moundy seismic facies, with moderate-strong amplitude and medium frequency, and distribute at the higher part of southern slope belt. Fore-reef and back-reef of patch reefs are slightly asymmetrical being perpendicular to palaeo-bathymetric orientation; while symmetrical to slightly asymmetrical being parallel to the palaeo-bathymetric orientation, and the wave impedance value is about 7 kg/m3×m/s. Platform-edge reefs are of flat-moundy seismic facies with strong amplitude and medium frequency, which develop at the carbonate platform edge of higher part of southern slope belt, and the wave impedance value is about 7.5 kg/m3×m/s. Pinnacle reefs grow up on volcanic cones, forming the complex of pinnacle reef and volcanic cone. The Miocene Meishan Formation reefs in southern Qiongdongnan Basin, northern South China Sea, with high quality source-reservoir-seal assemblages, have good petroleum exploration prospects.
Corresponding Authors:
E-mail address: 2005130009@163.com (Y.-W. Feng). Peer review under responsibility of China University of Petroleum (Beijing).
Cite this article:
Yang-Wei Feng,Hong-Jun Qu,Gong-Cheng Zhang et al. Seismic interpretation and hydrocarbon accumulations implication of the Miocene Meishan Formation reefs in southern Qiongdongnan Basin, northern South China Sea[J]. , 2017, 6(3): 206-218.
Yang-Wei Feng,Hong-Jun Qu,Gong-Cheng Zhang et al. Seismic interpretation and hydrocarbon accumulations implication of the Miocene Meishan Formation reefs in southern Qiongdongnan Basin, northern South China Sea[J]. Journal of Palaeogeography, 2017, 6(3): 206-218.
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