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

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, albite and organic acid generated from kerogen maturation. However, there have been no systematic experiments to study the formation mechanism of dissolution pores in calcareous shale. Thus, a series of simulation experiments were conducted on a semi-closed system to investigate the relationship between kerogen maturation and dissolution pore development in the Lucaogou Shale, Santanghu Basin, northeast Xinjiang Province, China.