Characteristics of Abnormal Pressure and Its Relationship with Hydrocarbon Accumulation in Nanpu Sag, Bohai Bay Basin

Abstract

Abstract:

Characteristics of abnormal pressure were investigated in Cenozoic, Nanpu sag by means of geophysical data and DST/RFT data. The top of overpressure occurs under 2.8 km, more overpressure under 3 km. Overpressured formation is always comprised of Ed and Es. Overpressured section could be divided into 3 segments vertically, which are hydrostatic segment, top overpressured segment and bottom overpressured segment. Excess pressure is horizontally charactered by successive distribution in different Cenozoic formations: Linque sub-sag and Caofeidian sub-sag are located in the central overpressured part, and from center of Nanpu sag to south shelving region, western Beipu structural belt and Laoyemiao structural belt the excess pressure decreases. The distribution of abnormal pressure is mainly controlled by the burial depth. Most hydrocarbons are distributed beyond the top overpressured segment. Overpressure is a significant controlling factor of hydrocarbon accumulation.

Key words: distribution of overpressure, controlling factor, hydrocarbon accumulation, Nanpu sag

CLC Number:

TE122.1

SUN Ming-liang, LIU Guang-di2, DONG Yue-xia. Characteristics of Abnormal Pressure and Its Relationship with Hydrocarbon Accumulation in Nanpu Sag, Bohai Bay Basin[J]. Geoscience, 2010, 24(6): 1126-1131.

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