pore size range of 30-50 nm. The modification process of pore morphology is as follows:the "ink bottle" hole with a relatively large aperture ratio of bottle body to bottle neck→the "ink bottle" hole with a relatively small aperture ratio of bottle body to bottle neck→wedge - type hole→parallel plate hole.

Liseroudi, M.H., Ardakani, O.H., Sanei, H., Pedersen, P.K., Stern, R.A., Wood, J.M., 2020. Origin of sulfate-rich fluids in the Early Triassic Montney Formation, Western Canadian Sedimentary Basin. Marine and Petroleum Geology 114, 104236.

http://www.sciencedirect.com/science/article/pii/S0264817220300192 This study investigates diagenetic and geochemical processes that control regional distribution and formation of sulfate minerals (i.e., anhydrite and barite) in the Early Triassic Montney Formation in the Western Canadian Sedimentary Basin. The generation of H S in hydrocarbon reservoirs is often associated with the dissolution of 2 sulfate minerals, as a major source of sulfate required for sulfate-reducing reactions. The formation of pervasive late diagenetic anhydrite and barite in the high H S zone of the Montney Formation is therefore contrary to the 2 normal paragenetic sequence of sour gas reservoirs. Petrographic observations revealed early and late anhydrite and barite cement. The early fine-crystalline anhydrite cement is dominant in northeastern British Columbia (low H S zone), while the late-stage coarse- 2 crystalline cement and fracture/vug-filling anhydrite are dominant in Alberta (high H S zone). The bulk isotopic 2 34 18 values (δ S: +2.9 to +24.7‰ V - CDT, δ O: -11.2 to +15.7‰ V -SMOW) suggest that sulfate-rich fluids originated mainly from modified Triassic connate water was the origin of early anhydrite. In contrast, the SIMS 34 18 isotopic values of late anhydrite (δ S: +18.5 to +37‰ V - CDT, δ O: +12 to +22‰ V -SMOW) and barite 34 18 cement (δ S: +23.3 to +39‰ V - CDT, δ O: +13.2 to +18.7‰ V -SMOW) as well as fracture/vug-filling 34 18 anhydrite (δ S: +23.5 to +24.7‰ V - CDT, δ O: +13.3 to +14.7‰ V -SMOW) from Alberta represents a mixed isotopic signature of Triassic connate water and contribution of dissolved sulfate-rich fluids derived from dissolution of Devonian evaporites. 87 86 The Sr/ Sr isotope ratios of the fracture/vug-filling anhydrite (0.7092 - 0.7102) are highly radiogenic suggesting extensive water/rock interactions between sulfate-rich fluids and siliciclastic and basement rocks. The similar isotopic composition of the late anhydrite/barite and fracture/vug-filling anhydrite in western 87 86 Alberta with Devonian evaporites isotopic signature, and the highly radiogenic Sr/ Sr ratio further supports sulfate-bearing fluids were mainly originated from underlying Devonian evaporites and migrated upwards through deep-seated faults/fractures to the Montney Formation.

Liu, F., Li, R., Liu, X., Yang, M., Zhao, B., Wu, X., Qin, X., 2019. Study of gas accumulation under 'source control' in western Sulige Gas Field, Ordos Basin Acta Sedimentologica Sinica 37, 1129-1139.

http://www.cjxb.ac.cn/EN/abstract/abstract4053.shtml Tight sandstone gas reservoirs are distributed over a wide area in the western Sulige gas field,with interconnected and superposed gas-bearing sands. The main gas-bearing sands occur in the eighth member of the Shihezi Formation and the first member of the Shanxi Formation. These are sand bodies of a river delta sedimentary system. In this study,the geochemical characteristics of the gas from the study area were analyzed together with the characteristics of the source rocks and hydrocarbon generation in the basin to determine the gas accumulation characteristics and the extent to which the gas-water relationship is controlled by the source rocks. It is shown that the gas in the study area mainly migrated from SW to NE,from west to east,and from bottom to top. It was found that the study area,which is located within the triangular zone of three high-intensity hydrocarbon generation centers,produces abundant gas, not only from the three hydrocarbon generation areas but also in the study area itself,which is continually producing gas to this day. The effect of the source rocks is that,as the gas migrates and accumulates,it drives formation water northward and upward regionally. The general pattern in the study area is summed up as "southern gas and northern water, more water above and less below".