Underpressure system and forming mechanism in the Shiwu depression of Songliao basin
Underpressure system and forming mechanism in the Shiwu depression of Songliao basin
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发表时间：
2003
期刊：
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通讯作者：
X. Xie;J. Jiao;Hh Xiong
中科院分区：
文献类型：
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作者：
X. Xie;J. Jiao;Hh Xiong
Underpressure system developed in the Shiwu depression of Songliao basin with measured formation pressure gradient ranging between 0.005 MPa/m to 0.008 MPa/m. This research result shows that the genetic mechanism of abnormal low pressure attributes to reduction of paleothermal gradients, uplift and erosion during Eocene period. Moreover, gas diffusions also affect the formation of underpressure system at local part. This system at present indicates the evolution process from overpressure to underpressure, which controls fluid flow and hydrocarbon migration in different stages of the depression. Hence, oil pools generating at early stage occur at the basin margin, and gas pools generating at late stage at central part of the Shiwu depression, Songliao basin.
