| 琼东南盆地深水区中央坳陷带异常压力分布特征 |
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| 关键词:differences distribution characteristics abnormal pressure central depression belt deepwater area Qiongdongnan Basin |
| 基金项目:“十二五”国家科技重大专项(编号: 2011ZX05025-002-05) |
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| Distribution Characteristics of Abnormal Pressure in Central Depression Belt, Deepwater Area, Qiongdongnan (Southeast Hainan) Basin |
| Abnormal formation pressure is currently an important phenomenon in the petroleum exploration of deepwater area in Qiongdongnan Basin. The distribution of abnormal formation pressure in the central depression belt was determined by using the new formation pressure predicting model based on the equation of balanceable stress in the pore-rock, and the factors responsible for different distributions of abnormal pressure in different sags were detected. Some conclusions have been reached: (1) The well profiles of pressure in the central depression belt could be divided into four types, i.e., normal pressure, one segment overpressure, over-pressure compartment, and cycling overpressure; (2) The top of the overpressure area becomes deeper and deeper from the continental shelf to the deep sea and also from the west to the east. (3) In the longitudinal direction, from the shallow water area to the deep water area and from the west to the east, the overpressure strides more and more formations, and its intensity becomes higher and higher from the shallow part to the depth; nevertheless, Ledong sag, Baodao sag and Beijiao sag have overpressure structures of “double-layer type”. In the plane, the mighty overpressure area is distributed in Ledong-Lingshui sag and Songnan-Baodao sag, and the overpressure intensity is generally reduced from the center composes of the four sags to both the north and the south (low) uplifts. The distribution of the overpressure in the central depression belt shows regularity on the whole, but the distribution characteristics of the overpressure in different sags are different, which is caused by the terminal high subsidence rate, the characteristics of the mud, the maturity of the source rock and the features of the faults. |
| WANG Zi-song,LIU Zhen,WANG Zhen-feng,SUN Zhi-peng,WANG Bing,LIU Peng,CHEN Yu-hang,CAO Shang.2014.Distribution Characteristics of Abnormal Pressure in Central Depression Belt, Deepwater Area, Qiongdongnan (Southeast Hainan) Basin[J].Acta Geoscientica Sinica,35(3):355-364. |
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