A Study of Abnormal Pressure Distribution and Formation Mechanism in Qiongdongnan Basin
Received date: 2010-05-10
Revised date: 2010-09-23
Online published: 2011-04-10
Started from logging data,combined with the test pressure data and plentiful mud fluid data,distribution characteristics of formation pressure in Qiongdongnan basin is analyzed. On the base of these and combined with previous research results,we summarize the distribution of overpressure in the basin. That is,characteristics of individual wells can be summed up into four types,which include normal pressure,micro-super-pressure,super\|pressure and high pressure. High-pressure bladders appear on profile,which overpressure regimes can easily form in inner of sags. On the plane,high overpressure in the Lingshui Formation of Oligocene exists in Lingshui,Songnan-Baodao,Ledong Sag and so on. Generally,overpressure enhanced gradually from north to south,from west to east. On this basis,the mechanism of the basin overpressure is analyzed,and suggests that disequilibrium compaction caused by subsiding rate of up to 110m/Ma is the major factor for the formation of overpressure stratum. The formation of overpressure stratum is the result of subsiding rate of up to 105m/Ma,hydrocarbon-generation caused by high geothermal field,as well as weakened fault activity and enhanced sealing.
ZHU Jian-Jun, ZHANG Xiao-Bao, ZHANG Gong-Cheng, LIU Fang, ZHANG Ming-Feng, CHEN Guo-Jun, XIA Yan-Qing . A Study of Abnormal Pressure Distribution and Formation Mechanism in Qiongdongnan Basin[J]. Natural Gas Geoscience, 2011 , 22(2) : 324 -330 . DOI: 10.11764/j.issn.1672-1926.2011.02.324
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