STUDY ON SEDIMENTARY UNITS OF HUANGLIU FORMATION IN THE DONGFANG AREA OF YINGGEHAI BASIN
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摘要:
莺歌海盆地是南海北部陆架上发育的一个新生代大型转换-伸展型盆地，受基底断裂带控制，整体呈NNW—SSE向延伸。莺歌海盆地海底扇储层由于其巨大的油气勘探潜力得到了广泛重视。通过对莺歌海盆地东方某气田进行精密地震资料解释，寻找特殊地震波组构型，结合相应测井资料，识别出4种典型沉积单元：限定性朵体、限定性水道、水道-堤岸复合体和非限定性朵体，其中视距离水道末端远近又可以将限定性朵体分位近端朵体和远端朵体。浅海陆架盆地内由于挠曲坡折带的存在及底辟活动影响，也可以发育大型海底扇，打破了海底扇只发育在深水沉积环境中的传统观念。
Abstract:The Yinggehai Basin is a large Cenozoic transform-extension basin developed on the northern shelf of the South China Sea. It is controlled by basement faults which extend in NNW-SSE direction in general. The submarine fan reservoir in the basin has attracted great attention and interest from researchers because of its huge potential of oil and gas resources. Through precise seismic data processing and interpretation of a gas field in the east of Yinggehai Basin, special seismic waveform configurations are studied in this paper. Combined with logging data, four typical sedimentary units are recognized: the restrictive lobe, restrictive channel, channel-bank complex and non-restrictive lobe. According to the distance to the end of the waterway, the restricted lobe can be divided into proximal and distal ones. Large submarine fans can also develop in shallow shelf basins due to the existence of flexural slope breaks and the influence of diapir activities. The traditional idea, that believes that submarine fans may only develop in deep water environment, is not correct.
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