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克拉2气田是中国陆上勘探已知最大的天然气气田,下白垩系巴什基奇克组砂岩是其主力储层.为了揭示本区储层成岩作用和油气充注之间的成因联系,综合应用偏光显微镜、阴极发光显微镜、扫描电镜、CT扫描三维重构、X-射线衍射、荧光光谱、显微测温和激光拉曼等技术手段研究了克拉2气田储层的成岩作用和油气充注期次及特征,并且探讨了油气充注对成岩作用的影响.研究结果显示:本区的成岩矿物组合为石英次生加大边、方解石、白云石,铁白云石,微晶石英和自生高岭石.发育3期油气充注:第1期为低温高盐度的低成熟油气流体,以记录在石英愈合裂隙、长石解理和方解石胶结物中的黄褐色荧光包裹体为代表,充注时间为18Ma;第2期为高温高盐度的高成熟油气流体,以记录在石英愈合裂隙和白云石胶结物中的黄白-蓝白色荧光包裹体为代表,充注时间为6Ma;第3期为高温低盐度的天然气充注,以记录在石英愈合裂隙和铁白云石胶结物中的无荧光气烃包裹体为代表,充注时间4Ma.本区储层中自生高岭石、微晶石英和储层沥青是晚期天然气充注对储层改造的结果.
The Kela-2 gas field is the most known natural gas field in China for onshore exploration, and the Lower Cretaceous Bashijiqike sandstone is the main reservoir. In order to reveal the genetic relationship between reservoir diagenesis and hydrocarbon charge in this area, The diagenesis and hydrocarbon filling of reservoirs in Kela-2 gas field were studied by means of polarizing microscope, cathodoluminescence microscope, scanning electron microscope, three-dimensional reconstruction of CT scanning, X-ray diffraction, fluorescence spectroscopy, Period, and characteristics of the diagenesis, and discussed the effect of hydrocarbon filling on diagenesis. The results show that the diagenetic mineral assemblages in this area are dominated by quartz secondary growth, calcite, dolomite, iron dolomite, microcrystalline quartz and authigenic Lvling Stage 3 Hydrocarbon Filling: Stage 1 is a low-temperature, high-salinity, low-maturity hydrocarbon fluid represented by the yellowish brown fluorescent inclusions recorded in the quartz healing fissures, feldspar cleavage and calcite cements, and the filling time 18Ma; the second is high temperature and high salinity high mature oil and gas fluids, represented by yellow-white-blue-white fluorescence inclusions recorded in quartz healing fractures and dolomite cements with a filling time of 6Ma; the third is High-temperature and low-salinity gas filling, represented by non-fluorescent gas inclusions recorded in quartz-healing fractures and iron-dolomite cements, was filled for 4Ma. The kaolinite, microcrystalline quartz Reservoir bitumen is the result of retrofit of reservoirs with late filling of natural gas.