Based on carbon isotope analysis of the calcium carbonate cements in Jurassic sandstone, it is believed that gas dissipation was related with 20% of the calcium carbonate cements and the formation of tight sand seal, and the preferential dissipation and consumption of methane resulted in the wet-prone gas.

Interaction between different detergent assistants(Ⅰ)the effect of polycarboxylates on the crystallization of calcium carbonate;