Forced Regression and Normal Regression Deposition of Basin with Continental Shelf Slopebreak: A case study on Zhujiang and Hanjiang Formations of Pearl River Mouth Basin

Key words: 
• Pearl River Mouth Basin

Abstract: The question about the deposition and the corresponding systems tract in forced regression is always the domestic and foreign focal point of argument. Integrated with sequence stratigraphic depositional model which was established by Exxon Corporation, forced regression deposition was corresponded to the early lowstand systems tract and the late highstand systems tract,the normal regression deposition was corresponded to progradation depositions of late lowstand systems tract, early highstand systems tract. Taking Zhujiang and Hanjiang Formations of Pearl River Mouth Basin as an example, they can be divided into 7 thirdorder relative sealevel change cycles, corresponding to 7 thirdorder sequence. The relative sealevel change is the external influence of the accommodate space change. The progradation depositions of late highstand systems tract distribute above the shelf slopebreak. The lowstand fans distribute on and under the slope. The lowstand wedges distribute on and under the slopebreak zone. The progradation depositions of early highstand systems tract distribute above the slopebreak zone. They are all the favorable reservoirs.