地应力分析在东海油气勘探中的应用

THE APPLICATION OF TECTONIC STRESS FIELD ANALYSIS IN PETROLEUM EXPLORATION OF THE EAST CHINA SEA

本文利用应变椭球体理论,对东海陆架盆地地质应力场进行了分析,在东海陆架盆地中北西西向断裂自中新生代以来,表现了张性的特征,对油气的储盖均起着破坏作用。除北西西以外的其它方向的断裂,在长期压应力作用的情况下,最终均转变成压性、压扭性的断裂,其中反转构造对油气的储集和保存起到了积极的作用。

The author analysed the tectonic stress field in the East China Sea Shelf Basin according to the theory of strain ellipsoid, thinking that the NWW faults in the East China Sea Shelf Basin have the character of tensile state from Mz. to Cz..This may destroy the seals and reserviors. Except the NWW faults, the others were finally converted to compressional, or compressional shear faults. These faults are important for the accumlation and maintenance of petroleum.