STUDY ON THE POOL-FORMING PERIODS OF OIL AND GASIN QIJIA-GULONG SAG IN SONGLIAO BASIN
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摘要: 松辽盆地齐家—古龙凹陷在扶余、高台子、葡萄花、黑帝庙等多套油层获工业油流。应用储层包裹体均一温度以及显微傅立叶变换红外光谱等分析技术,结合储层的热演化史,探讨了各套油层的油气成藏特征。有机包裹体的类型和特征显示,青一段源岩生成的原油向储层中运移主要有3个期次,不同油层经历的成藏期次各异,储层中原油的性质是油气多期成藏的综合反映。包裹体均一温度指示凹陷内油气3个成藏期分别是嫩江组沉积末期、白垩纪末期和老第三纪末,油气成藏期次与盆地构造发展历程表现出较好的一致性。Abstract: There are a series of oil-and gas-bearing reservoirs in Qijia-Gulong Sag in Songliao Basin,including Fuyu,Gaotaizi,Putaohua,Heidimiao,etc.The characteristics of these reservoirs were discussed according to the homogenization temperatures of reservoir inclusions and micro-Fourier transform infrared spectroscopic analysis combining thermal evolution histories of the reservoirs.The types and characteristics of the organic inclusions indicate that there are 3 main migration periods of oil and gas generated from K1q1 source rock.There are different pool-forming periods for different reservoirs,and the oil/gas properties of reservoirs are the comprehensive reflection of multi-period pool-forming processes.The homogenization temperatures of inclusions show that the 3 pool-forming periods of the oil and gas in the sag are in the ends of K1n,K and E respectively.The pool-forming periods are well consistent with the tectonic-developing history in the basin.
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