Statement I: There is a large-scale fluctuation of oil flow from oil wells prior to earthquakes. Statement II: Tectonic stress accumulates to a certain level, the pore pressure within a deep oilbearing stratum reaches its breaking strength causing oil to sprout along the oil wells.

Statement I is true as historical seismic data and research indicate that oil wells near epicentral regions often exhibit anomalous variations in production and flow prior to earthquakes. These phenomena include sudden increases in oil quantity or a transition from pumping to flowing wells. Statement II provides the correct scientific explanation: as tectonic stress accumulates in the earthquake-generating region, it induces changes in pore pressure within deep oil-bearing strata. According to the elastic deformation seepage-flow (DSF) theory, this stress-induced pore pressure variation can reach a level that causes fluids to gush or sprout along the wells. Furthermore, fluid pressure is proportional to crustal strain and stress, meaning that precursory tectonic deformation directly influences the hydraulic behavior of subsurface reservoirs before the final rupture occurs.

Sources

1. [1] https://www.sciencedirect.com/science/article/abs/pii/0031920189902483