Detection of Dissolution Pores in the Marginally Mature Calcareous Lucaogou Shale: New Insights in Nanopore Development in Terrestrial Shale Oil Reservoirs

Objective Calcareous shale in semi-deep and deep lacustrine facies is regarded as an oil shale exploration target, because these shale formations possess excellent storage capacity caused by widely developed internal particle pores and dissolution pores and are responsive to hydraulic fracturing due to the high content of carbonates. Generally, the dissolution pores are considered to be caused by the interaction between calcite, dolomite。