四川盆地海相地层可溶有机质成气规律研究

发布时间：2018-07-03 10:08

本文选题：四川盆地 + 分散可溶有机质　；参考：《东北石油大学》2015年硕士论文

【摘要】：四川盆地海相地层有机质演化程度较高,晚近期干酪根直接成气能力已十分有限,主要依靠可溶有机质作为气源母质,为气藏提供气源。按照位置关系不同,可将此部分生气母质分为源内分散可溶有机质,源外分散可溶有机质及古油藏三类。传统天然气资源评价方法并未考虑可溶有机质排出烃源岩后作为源外分散可溶有机质裂解成气对成藏的贡献,进而影响了对成气期和成气中心的评价。本文运用改进的ΔlogR模型,对烃源岩中的有机碳含量及储层中的有机质碳含量的分布进行了评价。在可溶有机质成气转化率与产气率的研究上,采用十八烷与不同含水量的混合的黄金管实验,模拟地质条件下储层中不同含水量对可溶有机质成气的转化率和产率的影响,结果发现加水条件提高了可溶有机质在高演化阶段6%-28%的产气率,加水条件下可溶有机质裂解成气反应平均活化能高于无水条件下可溶有机质裂解成气反应的活化能,这使得加水条件下的有机质裂解成气的时间相对于无水条件下滞后,有利于晚期成气。应用生烃潜力法计算了筇竹寺组和灯三段两套烃源岩的排烃效率。应用分散可溶有机质成气理论结合化学动力学方法计算出川中地区灯四段源外可溶有机质生气为52.82×112m3,古油藏生气量为24.65×1012m3。灯二段源外可溶有机质生气为22.65×1012m3,古油藏生气量为6.07×1012m3。其中灯四段从二叠纪末期到白垩纪末期可溶有机质成气量占整个灯四段总成气量的99%,灯二段从二叠纪末期到白垩纪末期可溶有机质成气量占整个灯四段总成气量的92%。从成气瞬时产率来看干酪根生气、源内分散可溶有机质生气、源外分散可溶有机质及古油藏生气依次接力生气,源外分散可溶有机质及古油藏属于晚期成气。从各时期生气强度分布来看生气中心由凹陷中心向隆起区移动。
[Abstract]:The evolution of organic matter in marine strata in Sichuan basin is relatively high, and the ability of kerogen to form gas directly has been very limited in the late recent years, which mainly depends on soluble organic matter as gas source material to provide gas source for gas reservoir. According to the location relationship, the source material can be divided into three types: dispersed soluble organic matter in source, dissolved organic matter outside source and paleoreservoir. The traditional evaluation method of natural gas resources does not consider the contribution of dissolved organic matter to the gas accumulation after the source rock is discharged from the source, which influences the evaluation of the gas forming period and the gas generation center. In this paper, the distribution of organic carbon in source rock and organic carbon in reservoir is evaluated by using the improved 螖 logR model. In the study of gas conversion and gas production rate of soluble organic matter, a gold tube experiment with mixed octadecane and different water content was used to simulate the effect of different water content in reservoir on the conversion and yield of dissolved organic gas under geological conditions. The results showed that the gas production rate of dissolved organic matter in high evolution stage was increased by 6% to 28% under the condition of adding water, and the average activation energy of cracking gas reaction of soluble organic matter under the condition of adding water was higher than that of the gaseous reaction of soluble organic matter under the condition of water addition. This makes the time of organic matter cracking to gas lag compared with that under anhydrous condition, which is favorable to late gas formation. The hydrocarbon expulsion efficiency of two sets of hydrocarbon source rocks in Qiongzhusi formation and the third member of the Tangshan formation has been calculated by using the hydrocarbon generation potential method. The gas generation theory of dispersed soluble organic matter and the chemical kinetic method are used to calculate the gas generation rate of 52.82 脳 112m3 and 24.65 脳 1012m3 of the gas generated from the fourth member of the lamp source in the central Sichuan area, and the amount of gas generated from the paleoreservoir is 24.65 脳 1012m3. The gas generation of dissolved organic matter and paleoreservoir is 22.65 脳 1012m3 and 6.07 脳 1012m3respectively. From the end of Permian to the end of Cretaceous, the amount of dissolved organic matter in the fourth section of the lamp is 99% of the total gas of the fourth section of the lamp, and the gas capacity of the second stage of the lamp is 92% of the total gas of the fourth section of the lamp from the end of Permian to the end of the Cretaceous. According to the instantaneous production rate of gas, kerogen is generated, soluble organic matter is dispersed in source, dissolved organic matter is dispersed outside source and gas is generated in paleo-reservoir in turn, and dissolved organic matter and paleo-reservoir are separated outside of source and belong to late gas generation. According to the distribution of gas intensity in each period, the center of gas generation moves from the center of depression to the area of uplift.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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