Abstract : The pressure-temperature phase diagram of the quasi-1D organic conductor (TMTSF)2ReO4 has been revisited using transport and NMR measurements. This system presents two types of anion ordering: a low-pressure ordering characterized by the wave vector q2 and a high-pressure one with a wave vector q3. Between 8 and 10.7 kbar, both anion ordering transition appear successively upon cooling. Our results provide evidence that electronics instabilities (spin density wave and superconductivity) of the metallic phase (q3) coexist with the semiconducting state (q2). A very huge anisotropy is shown by transport in the coexistence regime that suggests a self-organization, along the direction of best conductivity a, of metallic parts in the insulating matrix. The texture made of anisotropic filaments along a is deduced by upper critical field measurements in the superconducting state.