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根据烃源岩热压模拟实验,结合温度—压力相图分析,研究了东濮凹陷文留地区油气资源在生排、运聚阶段相态的类型及演化特点。结果表明:沙三段烃源岩因埋深不同导致热演化程度不同,生、排油气相态的类型各异,主要包括重质油、常规油、挥发性油、凝析气和湿气—干气相态;运聚过程中油气相态的演化主要体现为油溶天然气出溶、原油稠化、原油裂解成气和原油逆蒸发反溶于气,其中中浅层主要为油溶天然气出溶,受温压和烃类组分双重因素控制,深层则主要为原油裂解成气,受温压条件的影响明显。在生排、运聚过程中油气相态演化特征研究的基础上,结合已发现油气藏相态类型的统计结果,确定了文留地区不同相态类型油气藏的垂向展布规律,深层以气藏为主,中浅层以油藏及临界态油气藏为主。
According to the hot-pressure simulation experiment of source rock and temperature-pressure phase diagram analysis, the types and evolution characteristics of oil and gas resources in Wenliu area of Dongpu Depression at the stage of biogenesis and transportation are studied. The results show that the source rocks of the third member of the Es3 have different degrees of thermal evolution due to their different burial depths, and the types of the phases of the raw and exiting oil and gas are different. They mainly include heavy oil, conventional oil, volatile oil, condensate gas and moisture - Dry gas phase. During the process of migration and accumulation, the evolution of oil-gas phase mainly reflects the dissolution of oil-soluble natural gas, the thickening of crude oil, the cracking of crude oil into gas and the reverse evaporation of crude oil into anti-gas, of which the middle-shallow layer is mainly composed of oil-soluble natural gas , Controlled by the dual factors of temperature and pressure and hydrocarbon components. In the deep layer, the crude oil is mainly cracked into gas, which is obviously affected by the temperature and pressure conditions. On the basis of the research on the evolution characteristics of oil and gas phases during the process of raw gas generation and accumulation and transportation, combined with the statistical results of the phase types of the discovered oil and gas reservoirs, the vertical distribution law of different phase types of oil and gas reservoirs in Wenliu area was determined. Mainly in gas reservoirs, mainly in oil and gas reservoirs in the middle and shallow layers.