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通过单偏光、荧光显微镜观察和显微冷热台测温等方法,对鄂尔多斯盆地西南部16口井24块上古生界砂岩样品进行全面的流体包裹体分析,归纳山西组和盒8段内主要含气层段流体包裹体岩相学特征,将不同包裹体组合内与烃类包裹体伴生的盐水包裹体均一温度、冰点温度等参数对比分析,结合研究区埋藏史推测致密砂岩储层内天然气的充注期次。测试结果显示与气态烃包裹体伴生的盐水包裹体均一温度范围为100~170℃,均一温度和冰点温度均未显示明显间断,表明储层内天然气运移是在中侏罗世—早白垩世内(200~100Ma)持续进行;愈合微裂隙内高气液比气态烃包裹体的气相组分以CH4为主,与其伴生盐水包裹体均一温度介于140~170℃之间,表明储层内天然气大量富集期为早白垩世(155~100Ma);流体包裹体组合、均一温度及其地球化学组分测试结果综合分析认为,鄂尔多斯盆地西南部上古生界天然气运移富集是一个相对漫长且连续的过程,并以早白垩世为主要充注期。
The fluid inclusions in 24 samples of Upper Paleozoic from 16 wells in southwestern Ordos Basin were analyzed by single polarization, fluorescence microscopy and microthermometer, Based on the petrographic characteristics of fluid inclusions in gas-bearing intervals, the parameters of homogenization temperature and freezing temperature of the brine inclusions associated with hydrocarbon inclusions in different inclusion assemblages are comparatively analyzed. Based on the burial history in the study area, The filling period. The test results show that the homogenization temperature range of brine inclusions associated with gaseous hydrocarbon inclusions is 100-170 ℃, and the homogenization temperature and freezing temperature show no obvious discontinuities, indicating that the migration of natural gas in the reservoirs is from Middle Jurassic to Early Cretaceous (200 ~ 100Ma). The main gas inclusions in the gas-liquid inclusions with high gas-liquid ratios in the healing microfractures are mainly CH4, and the homogenization temperature of the associated brine inclusions is between 140 and 170 ℃, indicating that the gas- The abundant enrichment period of natural gas is Early Cretaceous (155 ~ 100 Ma). The comprehensive analysis of fluid inclusion assemblage, homogenization temperature and geochemical test results indicates that the migration and enrichment of natural gas in the Upper Paleozoic in the southwestern Ordos Basin is a relatively long And the continuous process, and the early Cretaceous as the main filling period.