Abstract:

The structures of Jiyang depression are very complex, so it is difficult to predict the fractures developed in the buried hill by seismic data. The fractures are always controlled by the tectonic stress distribution; therefore, to study the paleo-stress field is a useful method to predict the fractures. In this study, the borehole tectonic stress of Zhuanghai area was analyzed by FMI images. It was found that the directions of stress fields were variable and the structures near the boreholes were influenced by the faults. The dipping direction of the strata and fractures changed intensively. The present direction of the principle horizontal stress is NWW-SEE in the north of Zhuanghai area, while the direction is NEE-SWW in the south area.

Key words: Jiyang depression, buried hill, tectonic stress, FMI