Combining with borehole breakout and hydraulic fracture characteristics of FMI information,formation stress direction is inversed simultaneously.

Effect of tectonic deformation on current geo-stress orientation

To know the current terrestrial stress direction is the basis for effective fracturing in this area.

The paper approaches the relationship among fault capable degree,toctonic stress orientationand geometric characteristics of fault plane in three dimensions by the method of Mohr stress circle.

Temporal-spatial characteristics of stress orientation in the area are studied in this paper.

The stress orientation and relative stress parameter before and after Tangshan earthguake have been analyzed by meanse of azimuthal feature releasing seismic energy in this paper.

Based on the theoretic model, formation stress may be derived from constraint inversion method with use of imaging data of borehole collapse and hydaulic fractures, in such away that not only the maximum horizontal stress profile but also the minimum one can be obtained, and further the formation breaking pressure, which is helpful to borehole stability analysis and fracturing design.

Calculated are the rock and formation stress parameter with mechanics law; built is the mechanics model of calculation of capillary pressure under the condition of formation stress, so, we can get more reliable information about the formation.

Through analyzing frecuring data of many wells in the Ordovician formation in central Tarim basin,it is found that formation stress information in pressure-time curves obtained from the fracturing data may reflect the true formation stress.