Abstract

Monitoring acoustic emission behaviour during core restressing is a means of collecting stress history information, but this effect (the "kaiser" effect) for rocks cannot he used alone for paleostress reconstruction. Therefore, an integrated approach including regional geological and geophysical information such as magnetic, gravitational, and image data has been implemented in combination with core measurements and imaging logs. This analysis leads to a prohable history of far-field loading, and allows greater confidence in the interpretation in that numerous independent sources seem to suggest that the interpretation is consistent. For details of local stress distributions, Kriging methods are used, based on knowledge of the ancient landforms and erosional geometry. Practical applications of paleostresses in the context of basin analysis seem feasible if fractures can be linked to hydrocarhon migration and accumulation. To demonstrate this, the method is applied in the Ordos Basin in North China to establish the relationships between far-field and local stresses, and to link the stress and fracture history to the migration and accumulation of the large gas field found in the central Ordos area.

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