Seismic interpretation of carbonate platform in the southern deepwater area, Qiongdongnan Basin

被引：0

作者：

Wu X. ^{[1
]}

Pu R. ^{[1
]}

Zhang G. ^{[2
]}

Qu H. ^{[1
]}

Shen H. ^{[2
]}

机构：

[1] State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069, Shaanxi

[2] CNOOC Research Institute, Beijing

来源：

Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2017年 / 52卷 / 02期

关键词：

Carbonate rock; Facies distribution; Forward modeling; Qiongdongnan Basin; Thickness;

D O I：

10.13810/j.cnki.issn.1000-7210.2017.02.023

中图分类号：

学科分类号：

摘要：

The south deepwater horst in Qiongdongnan Basin is one of potential exploration areas and the Xisha Islands is carbonate reef flat strata developed from Miocene to Quaternary. Based on the palaeogeographic and palaeostructure analysis, the southern horst had proper conditions for carbonate, reef and tide flat generated during the Miocene. Carbonates show high-amplitude and low-frequency reflection on seismic section. Reef flats distributes on structure high and they are thicker than other strata in the same period. Based on velocity lithology extracted from drilling data in adjacent areas, we perform a forward modeling to simulate reflection of carbonates with different thickness. Then we identify several important thickness control points on seismic sections such as pinch point, λ/4 point, λ/2 point. Finally we construct carbonate thickness maps of the south deepwater area in Qiongdongnan Basin. Based on the palaeogeographic principle, palaeostructure dominate carbonate sedimentation, and seismic response of reef flat, we can draw a conclusion: Carbonate rocks of Miocene developed in the south horst, Qiongdongnan is mainly a peninsula isolated carbonate flat and slope sediment towards the north of Xisha Islands, and the carbonate platform facies is composed of platform gentle slope, platform steep slope, gravity facies, platform hollow, reef, and tide flats. © 2017, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.

引用

页码：381 / 391

页数：10

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