Reservoir induced seismicity—a new model

Abstract

SUMMARYDeficiencies of different existing models on 'Reservoir Induced Seismicity' have been discussed and a new mathematical model, which enhances a better understanding of triggering mechanism in terms of changes in effective stresses, in situ stresses and water level variations, has been discussed in this paper. In the model fractured rock is simulated by a fluid-filled elastic material subject to Mohr-Coulomb failure criterion. The model has been found to be capable of responding effectively to site specific attributes. It can recognize and explain the phenomenon of time lag observed in several actual cases. It is also capable of simulating stabilization of rock-reservoir system after a period of activities that follow the initial stage of filling. One dimensional and two dimensional, isotropic and anisotropic cases have been analysed and the model predictions have been found to agree qualitatively with the field observations.

Seismogenic permeability, ks

“…In the case of RIS, water level changes are directly related to pore pressure changes below the reservoir (next section). The results of modeling [ Saxena et al , 1988] and empirical evidence at Koyna Reservoir [ Gupta , 1983] also relate an increase in seismicity to an increase in the rate of filling, i.e., to the rate of increase in pore pressure. Next, we present some background on the mechanism of reservoir‐induced seismicity.…”

“… Saxena et al [1988] used Biot’s consolidation theory in developing a model for reservoir‐induced seismicity by simulating fractures under a reservoir as fluid‐filled elastic material. They considered the overburden pressure due to reservoir impoundment to be the maximum stress responsible for destabilizing the fractures according to Mohr‐Coulomb fracture failure criterion.…”

Μελέτη Της Μακροχρόνιας Παραμόρφωσης Του Φράγματος Κρεμαστών Με Βάση Ανάλυση Γεωδαιτικών Δεδομένων Και Μεταβολών Στάθμης Ταμιευτήρα

“…Ορισμένοι ερευνητές (Comninakis et al, 1968;Gupta et al, 1972;Stein et al, 1982;Saxena et al, 1988) Gupta and Rastogi, 1967) Τα σεισμικά αυτά γεγονότα συνδέθηκαν από ορισμένους ερευνητές με την αύξηση του νερού στον ταμιευτήρα (Gupta and Rastogi, 1967;Galanopoulos 1967 .…”