论文部分内容阅读
采用包裹体岩相学观察、显微测温、储层定量颗粒荧光分析、红外光谱分析及油气地球化学分析等方法,从古流体证据的角度对迪北气藏的油气充注历史进行研究。结果表明迪北气藏具有2期油气充注特征:第Ⅰ期主要源自三叠系湖相烃源岩排出的油,对应于镜下发浅黄色荧光的油气包裹体,红外光谱分析表明其成熟度相对较低,定量颗粒荧光分析表明存在古油藏,也是此期原油充注的证据;第Ⅱ期主要源自侏罗系煤系烃源岩排出的天然气,对应于发蓝白色荧光的油气包裹体,红外光谱分析表明其成熟度相对较高,且此期高成熟天然气充注使得早期充注的原油遭受气洗脱沥青作用。迪北气藏的2期油气充注使其具有中新世早中期的原油充注、上新世以来的致密深盆气藏叠加、西域期以来的致密气藏调整改造再富集的成藏过程。
Based on the petrographic evidence of inclusions, microscopic temperature measurement, quantitative particle fluorescence analysis of reservoir, infrared spectrum analysis and oil-gas geochemical analysis, the history of hydrocarbon filling in Di gas reservoirs is studied from the perspective of palaeo-fluid evidence. The results show that the Di gas reservoirs have two stages of oil and gas charge characteristics: the first stage is mainly derived from the source rocks of the Triassic lacustrine source rocks, corresponding to the light yellowish-yellow fluorescence of oil and gas inclusions, infrared spectroscopy showed that The maturity is relatively low. Quantitative particle fluorescence analysis shows the existence of paleo-oil reservoirs, which is also evidence of the filling of crude oil in this period. The second phase mainly comes from natural gas discharged from Jurassic coal-derived source rocks corresponding to blue-white fluorescence Oil-gas inclusions and FTIR analysis show that their maturity is relatively high, and the filling of mature natural gas in this period makes the crude oil infused early by gas-elution and deasphalting. The filling of the second phase of the gas reservoirs in the Di gas reservoir made it possible to fill up the oil reservoirs during the early and mid Miocene with the filling of the deep deep basin gas reservoirs since the Pliocene, and the reformation and re-enrichment of the tight gas reservoirs since the Western Hemisphere process.