In order to improve the cavity construction rate of SWRH (single-well retreating horizontal) leaching method on Salt Cavern Underground Storage, the influence of water injection direction on fluid migration in the cavity was studied during cavern constructional period through similar model test and numerical calculation. Simulation results show: The concentration of the injected fresh water increases rapidly after contacting the brine in the cavity, when the concentration increases to about 23%, it becomes a slow increase; the upward and downward incidence is beneficial to the construction of rapid cavity, and the vertical downward incidence is beneficial to the construction of larger cavity. The fluid migration law of similar model test is basically consistent with that of numerical simulation, which proves the correctness of the numerical model. Tests found: the fluid in the cavity can be divided into four regions : the plume region, the boundary solution region, the convective diffusion region and the bottom saturation region; Replacing the water injection direction changes the fluid concentration and velocity in the plume region, which in turn affects the height of the boundary solution region. Compared with the horizontal incidence, the vertical upward incidence, the upward and downward incidence, the four directions incidence and the vertical downward incidence boundary dissolution zones increase by 22.2%, 26.9%, 51.1%, 135.6%. Replacing the water injection direction changes the initial downward flow rate of fresh water, which in turn changes the height of the bottom saturation region Compared with the horizontal incidence, the vertical upward incidence, the upward and downward incidence, the four directions incidence and the vertical downward incidence heights are reduced by 0%, 12.9%, 29.9%, 70.1%.

Increasing large-scale development and utilization of new geo-energy sources and geo-resources heralds the need for worldwide implementation of sustainable development. The extreme complexity in recovery conditions, including ultra-low-permeability reservoirs, low-energy-density reserves and high temperatures and high pressures, defines a challenge in efficiently recovering such energy, fuel and mineral resources. Hence, development of efficient mining methods and the related determination of geo-mechanical properties of reservoirs remains a key topical issue. During the simultaneous 2 ${}^{\mathrm{nd}}$ International Symposium on In-situ modification of Deposit Properties for Improving Mining and the 7 ${}^{\mathrm{th}}$ Unconventional Geomechanics Symposium, held both in person and online from November 7-8, 2020, a broad array of advances in the science and technology of geo-energy and geo-resource recovery were presented. The symposia were attended by more than 200 participants from China, USA, Canada, UK, Australia, Japan, Singapore, and Turkey. Twenty-four invited talks were presented, seven of which were online, four of which were pre-recorded, and thirteen of which were in person. Twenty-two general talks were held in two parallel sessions. Participants interact freely through both online and in-person speakers. These interactions will enable future collaborations.