As cement, authigenicmineral or vein, dawsonite is found not only in Marine dolomite and oil shale, but also in terrigenous fragmentary rock and coal measures.
As the main flow manner of formation water in deep reservoir, circulated convection current controlled authigenicmineral location and secondary pore distribution.
循环热对流是深部储层流体的主要流动方式，它控制着自生矿物在砂层中的析出位置和次生孔隙的分布特征。
3
Carbonate could be precipitated as authigenic calcite mineral in the pores in case of that pore has enough HCO 3 - ions since mudstone should be an enclosed system.