The occurrence and genetic origins of gaseous inclusions in the Sinian carbonate reservoirs of Anyue gas field in central Sichuan Basin were investigated with techniques of micro-Raman spectroscopy and microthermometry to trace the oil and gas accumulation history. Three types of gaseous inclusions were identified in terms of their compositions and the homogenization temperatures (Ths) of their coeval aqueous inclusions. Both type I and type II gaseous inclusions are dominantly composed of methane with varying contents of pyrobitumen, indicating their origins of type I and II precursor oil inclusions that have been thermally converted to the present gaseous inclusions. The aqueous inclusions coeval with the present type I and type II gaseous inclusions have Th values in the range of 120.3–136.9 °C and 140.8–168.5 °C, respectively, further confirming that they are derived from precursor oil inclusions that were formed during 251–204 Ma and 202–169 Ma, respectively. For type III gaseous inclusions, their gaseous components are also dominated by methane with minor CO₂ and H₂S, but no detectable pyrobitumen is observed in them. This implies that they are not genetically related to any precursor oil inclusions but were formed by direct trapping of gases in reservoirs when the paleo-oil pools have been thermally converted to gas pools during the time of 153–103 Ma, which is consistent with the high Th values of 203.8–237.1 °C of their coeval aqueous inclusions.

The density of methane in gaseous inclusions was also estimated from methane Raman shifts. The respective values of methane density for types I, II and III gaseous inclusions vary from 0.262 to 0.293 g/cm³ (avg. 0.272 g/cm³), from 0.231 to 0.264 cm³/g (avg. 0.247 g/cm³), and from 0.231 to 0.293 cm³/g (avg. 0.249 g/cm³). Based on the density of methane in type III gaseous inclusions and the Th values of their coeval aqueous inclusions, their trapping pressures were calculated to be in the range of 93.3–134.1 MPa with formation pressure coefficients of 1.32–1.79. This indicates that there were overpressures in the reservoirs during the oil to gas cracking and that the almost hydrostatic system of the present Sinian gas pools is mostly related to the extensive tectonic uplift and subsequent loss of natural gas since late Cretaceous.

利用微拉曼光谱和微热分析技术，研究了川中盆地安岳气田震旦系碳酸盐岩储层中气态包裹体的形成及成因。根据它们的成分和其同期水质夹杂物的均质化温度（Ths），鉴定出三种类型的气态夹杂物。I型和II型气态包裹体均主要由甲烷组成，并具有不同的焦磷酸含量，表明它们的来源是I型和II型前驱油包裹体，它们已经热转化为目前的气态包裹体。与当前的I型和II型气态包裹体同时存在的含水夹杂物的Th值分别在120.3-136.9°C和140.8-168.5°C的范围内。进一步证实，它们分别来自于251–204 Ma和202–169 Ma期间形成的前驱油包裹体。对于III型气态包裹体，其气态成分也以甲烷和少量CO为主₂和H ₂ S，但在其中未观察到可检测的焦磷酸。这意味着它们与任何前驱油包裹体都不具有遗传相关性，而是在153-103 Ma时间内古油藏被热转化为气藏时，通过直接捕集储层中的气体形成的。他们的同代含水包裹体的Th值高，为203.8–237.1°C。

气态夹杂物中甲烷的密度也可以通过甲烷拉曼位移来估算。I型，II型和III型气态夹杂物的甲烷密度分别为0.262至0.293 g / cm ³（平均0.272 g / cm ³），0.231至0.264 cm ³ / g（平均0.247 g / cm ^3））和0.231至0.293 cm ³ / g（平均0.249 g / cm ³）。根据III型气态包裹体中甲烷的密度及其同卵状含水包裹体的Th值，计算得出它们的捕集压力在93.3-134.1 MPa范围内，地层压力系数为1.32-1.79。这表明在油气裂解过程中储层中存在超压，并且当前震旦纪气藏的几乎静水压系统主要与白垩纪晚期以来的广泛构造隆升和随后的天然气损失有关。