STUDY ON SEDIMENTARY UNITS OF HUANGLIU FORMATION IN THE DONGFANG AREA OF YINGGEHAI BASIN

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.