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根据包裹体均一温度测定和激光拉曼光谱分析,在普光气田三叠系储层中发现一批高密度甲烷包裹体,其均一温度Th=-117.5~-118.1℃,相对应的密度分别为0.3455～0.3477g/cm3,测定的甲烷包裹体的拉曼散射峰v1位移主要为2911~2910cm?1,也反映甲烷包裹体密度很高.样品中与甲烷包裹体主要共生的盐水包裹体均一温度Th=170~180℃,结合拉曼光谱分析的甲烷包裹体组成,用PVTsim软件模拟高密度甲烷包裹体在地质历史中的捕获压力达153~160MPa以上.观测数据表明,普光气田目前虽然为常压气藏,储层中流体压力在56~65MPa左右,但在白垩纪时期原油裂解气大量产出阶段可能形成高压.高密度甲烷包裹体的发现,为气藏在地质历史中的超压现象提供了重要证据.同时,根据拉曼光谱分析,发现部分高密度甲烷包裹体含少量H2S,CO2和重烃等信息,也揭示了包裹体捕获的地球化学环境可能与H2S的生成有关.甲烷包裹体的观测结果为研究油裂解气藏的压力条件和探讨H2S成因的硫酸盐化学反应(TSR)提供了依据.
According to the homogenization temperature of the inclusions and laser Raman spectroscopy, a series of high-density methane inclusions were found in the Triassic reservoir of the Puguang Gas Field. The average temperature Th = -117.5 ~ -118.1 ℃ and the corresponding densities were 0.3455 ~ 0.3477g / cm3, the measured v1 scale of Raman scattering peak of methane inclusions is mainly 2911 ~ 2910cm? 1, which also reflects the high density of methane inclusions. The salt inclusions homogeneity temperature Th = 170 ~ 180 ℃, combined with Raman spectroscopy analysis of methane inclusions, PVTsim software simulation of high-density methane inclusions in the geological history of the capture pressure of 153 ~ 160MPa above observations show that although the Puguang gas field at atmospheric pressure The fluid pressure in reservoirs and reservoirs is about 56 ~ 65 MPa, but high pressure may be formed during the massive output of cracked gas during the Cretaceous period.The discovery of high-density methane inclusions provides the overpressure phenomenon of gas reservoirs in geological history Important evidence.At the same time, according to the Raman spectrum analysis, some high-density methane inclusions were found to contain a small amount of information such as H2S, CO2 and heavy hydrocarbons, also revealed that the entrapment of the geochemical environment may be related to the formation of H2S . Observations for studying inclusions methane cracking oil and gas reservoir pressure conditions Genesis sulfate chemical reaction of H2S (TSR) was provided.