【作者】 王鹏；

【导师】 林玉祥；

【作者基本信息】 山东科技大学 ， 矿产普查与勘探， 2011， 硕士

【摘要】 沁水盆地煤系地层丰富的天然气资源为其提供了形成大中型气藏的物质基础。该地区煤成气经历了复杂的生、运、聚、散等一系列复杂地质过程,导致其赋存状态多样,散失、聚集、溶解、扩散状况复杂。该专题的研究,不仅了丰富天然气成藏理论,而且在实践中直接与天然气评价和勘探目标选择密切相关,对沁水盆地天然气成藏研究有着重要的意义,为实现本区煤层气与游离气合理共采的目标奠定了理论基础。本文总结出了沁水盆地煤系地层天然气吸附态、游离态、溶解态的赋存状态及其因压力、温度、构造运动等原因发生相互转化的规律,并以天然气运聚动平衡理论为指导,进一步完善和发展了天然气运聚和成藏的定量研究方法,推进了天然气成藏的定量化研究,并发现了天然气成藏过程中“供气”与“散失”消长关系和动态演化特征。通过分析和总结天然气运聚原理,恰当应用地层埋藏史模型、热史模型、生烃模型、排烃模型、吸附模型、水溶解气模型、聚集模型、断层散失模型和圈闭聚集模型等多种数学地质模型,并在此基础上进行更为精细的数值模拟,得到吸附气量、溶解气量、散失气量、可供聚集气量和圈闭资源量演化史等针对性和实用性较强的研究成果,并为动态聚集条件评价提供依据。更多还原

【Abstract】 Coal Measure Strata in Qinshui Basin are rich in natural gas resources which provide material foundation for forming medium-large gas pools. Coal-formed gas in this region has experienced complex geological process such as generation, transportation, aggregation and losing which lead to the diversity of occurrence and the complexity of conditions of loss, accumulation, dissolution and diffusion. This project can not only enrich gas accumulation theory, but also establish the direct relationship between evaluation and selection of exploration target of natural gas, which are of great significance to the study of natural gas accumulation in Qinshui Basin. Besides, this project found theoretical principle for the achievement of reasonable co-mining of coalbed methane and free gas.This paper summarizes the occurrence states of coal-formed natural gas in Qinshui basin such as absorption state, free state and dissolved state and the law of mutual transformation between those states owing to pressure, temperature and tectonic movements; and the quantitative methods for natural gas migration and accumulation have got further improvement and development together with the guide of the theory of the dynamic balance of natural gas migration and accumulation, the quantitative research of accumulation of natural gas has been promoted, what is more, this paper also describes the trade-off relationship and dynamic evolution characteristics between "Gas Supply" and "Dissipation" in the process of gas accumulation. Through analyzing and summarizing the principle of natural gas migration together with the proper application of many geomathematical geology models such as Burial History model, Thermal History model, Hydrocarbon-Generating model, Hydrocarbon-Expulsion model, Adsorption model, Water-Dissolved gas model, Accumulation model, Fault-Lost model and Trap-Aggregation model, furthermore, we took on more elaborate numerical simulation which leads to strong pointed and practical achievement such as adsorption quantity, dissolved gas, gas diffusing amount, gas available for accumulation and history of trap resource quantity, which provide foundation for dynamic accumulation condition assessment.更多还原