松辽盆地南部长岭气田登娄库组气藏成藏机理及三维建模
发布时间：2018-05-04 02:32
本文选题：长岭气田 + 登娄库组 ； 参考：《吉林大学》2017年硕士论文
【摘要】：松辽盆地南部长岭断陷的下白垩统登娄库组致密砂岩储层中发现了长岭气田,拓展了该断陷天然气勘探的新领域。本文通过生储盖运保等因素分析登娄库组气藏的成藏条件,并将构造演化史分析与储层包裹体分析技术相结合,以CS1井埋藏史恢复为基础,研究长岭气田登娄库组烃类气藏的形成时间与期次。通过收集的资料以及大量的数据分析得知,长岭断陷登娄库组自身不具备生烃条件,下伏层烃源岩产生的煤型CH4先期在下白垩统营城组火山岩中富集成藏。至晚白垩世青山口末期,在长岭气田北部的乾安附近发生过一次水下火山岩喷发事件,引发原有的深源断裂活化,幔源无机CO_2沿着断裂向地壳表层运移到营城组火山岩烃类气藏中,被置换出的CH4烃类气体此时向上运移至登娄库组砂岩层中富集形成次生气藏,显而易见,断裂活动是登娄库组气藏形成的主控因素。在显微镜下观察长岭气田登娄库组储层包裹体为气、液俩相,包裹体均一温度在99.2~138.6℃范围,主峰值在120~125℃之间,主峰频率约为33㳠,证实长岭气田登娄库组气藏为一期成藏。将CS1井的埋藏史、地热史和储集层中流体包裹体的均一温度数据相结合,确定长岭气田登娄库组烃类气的成藏时间是79Ma,该时期登娄库组埋藏深度为1800~2000m,储层成岩程度相对要弱,物性特征相对要好,恰好处于断陷期三套烃源岩的生气高峰期和断裂的活化期,利于CH4的运移和富集成藏。应用GOCAD建模软件,建立了长岭气田登娄库组烃类气成藏过程的三维地质模型。
[Abstract]:Changling gas field was discovered in the tight sandstone reservoir of the lower Cretaceous Denglouku formation in Changling fault depression in the south of Songliao Basin, which expanded the new field of natural gas exploration in this fault depression. In this paper, the reservoir forming conditions of Denglooku formation gas reservoir are analyzed by the factors such as source, reservoir and cover transportation, and the structural evolution history analysis is combined with the reservoir inclusion analysis technique, based on the recovery of buried history of CS1 well. The formation time and period of hydrocarbon gas reservoirs in Denglooku formation of Changling gas field are studied. The collected data and a large amount of data analysis show that the Denglooku formation in Changling fault depression does not possess the conditions for hydrocarbon generation, and that the coal-type CH4 produced by the underlying source rocks was rich and integrated in the volcanic rocks of the Yingcheng formation of the Lower Cretaceous. At the end of Qingshankou in late Cretaceous, there was an underwater volcanic eruption near Gan'an in the northern part of Changling gas field, which caused the activation of the original deep-source faults. The mantle source inorganic CO_2 migrates to the volcanic rock hydrocarbon gas reservoir of Yingcheng formation along the fault to the surface of the crust, and the replaced CH4 hydrocarbon gas migrates upward to the sandstone layer of the Dendenglouku formation to enrich and form the secondary gas reservoir, which is obvious. Fault activity is the main controlling factor of gas reservoir formation in Denglooku formation. Under microscope, the reservoir inclusions of Dengloku formation in Changling gas field are gas and liquid facies, the homogenization temperature of inclusions is in the range of 99.2N 138.6 鈩，
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