柴达木盆地西部地区古近系—新近系天然气成藏期次研究

发布时间：2018-01-25 00:40

本文关键词： 柴达木盆地西部地区天然气盆地模拟圈闭演化均一温度成藏期次　出处：《地学前缘》2016年05期 　论文类型：期刊论文

【摘要】：近年来在柴达木盆地西部地区古近系—新近系地层发现了较多的天然气,但已探明的天然气储量与天然气资源量相差甚远;这就需要把资源量转化为储量,需要加强天然气的生成、运移及富集规律等基础地质研究,其中又以天然气成藏期次研究最为重要。因此,文中以柴达木盆地西部地区古近系—新近系地层为重点研究对象,采集了柴西地区大量的包裹体样品并测试了其均一温度,收集和分析了研究区不同构造带的22个包裹体样品均一温度数据,在此基础上结合盆地模拟、圈闭演化对工区天然气成藏期次进行了研究,为下一步的天然气勘探提供了依据。研究结果表明:柴达木盆地西部地区古近系—新近系烃源岩的主力生烃期为N12末—N22时期和N32末—Q时期;圈闭形成发育期贯穿整个古近系和新近系,天然气成藏期晚于圈闭形成期,结合生烃史认为其成藏期在N1末时期以后;流体包裹体均一温度与地温史和埋藏史曲线也证实研究区至少存在两期油气充注,即N1末—N12初和N22末—N32初。总之,柴达木盆地西部地区古近系—新近系天然气具有多期生烃、晚期成藏的特点;其主要成藏期为N1末—N12初期和N22末—N32初期,具有明显的长期性和阶段性。最后提出建议,即围绕中浅层N1末—N12初期和N22末—N32初期气藏进行勘探部署,为研究区的天然气勘探开发打开一个新场面。
[Abstract]:In recent years, more natural gas has been found in the Paleogene Neogene strata in the western Qaidam Basin, but the proven natural gas reserves are far from those of the natural gas resources. Therefore, it is necessary to strengthen the basic geological research, such as the generation, migration and enrichment of natural gas, among which the study on the stage of gas accumulation is the most important. In this paper, the Paleogene Neogene strata in the western Qaidam Basin are taken as the main research objects. A large number of inclusion samples in the western Qaidam Basin are collected and their homogenization temperatures are measured. The homogeneous temperature data of 22 inclusions samples from different structural zones in the study area were collected and analyzed. On the basis of this, the natural gas accumulation stages in the working area were studied in combination with basin simulation and trap evolution. The results show that the main hydrocarbon generation periods of Paleogene-Neogene source rocks in western Qaidam Basin are N12-N22 and N32-Q; The trap formation and development period runs through the whole Paleogene and Neogene systems, and the natural gas accumulation period is later than the trap formation period, which is considered to be after the N _ 1 late period combined with the hydrocarbon generation history. The curves of homogenization temperature and geothermal history and burial history of fluid inclusions also confirm that there are at least two stages of oil and gas charging in the study area, that is, at the end of N1 to N12 and N22 to N32. Paleogene-Neogene natural gas in western Qaidam Basin is characterized by multiple hydrocarbon generation and late accumulation. The main pool-forming period is at the beginning of N1 ~ -N _ 12 and N _ 22 ~ N _ 32, and it has obvious long-term character and stage. Finally, some suggestions are put forward. That is to say, the exploration and deployment of the gas reservoirs around the middle and shallow N _ 1 ~ (-N _ (12)) and N _ (22) _ (-N _ (32)) have opened a new scene for the exploration and development of natural gas in the study area.
【作者单位】：中国石油青海油田公司勘探事业部;中国地质科学院地质力学研究所;中国地质科学院页岩油气调查评价重点实验室;中国石油化工股份有限公司石油物探技术研究院;中国石油勘探开发研究院廊坊分院;
【基金】：国家自然科学基金项目“氯化盐浓度对气源岩生成天然气组成的影响”(41272159)
【分类号】：P618.13
【正文快照】： 刘军1,刘成林2,3,*,董清源4,孙平5,张林5,郭泽清51.中国石油青海油田公司勘探事业部,甘肃敦煌7362022.中国地质科学院地质力学研究所,北京1000813.中国地质科学院页岩油气调查评价重点实验室,北京1000814.中国石油化工股份有限公司石油物探技术研究院,江苏南京2111035.中国石

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