松辽盆地北部浅层气成因类型及形成条件研究

发布时间：2018-05-04 08:26

本文选题：浅层气 + 原油伴生气　；参考：《吉林大学》2015年硕士论文

【摘要】：本文针对松辽盆地浅层气目前亟待解决的天然气成因类型,形成条件和有利区分布等问题,着眼于国内外前沿的天然气分析技术和研究方法,从研究浅层气的地球化学特征入手,分析泥岩物性特征、原油地球化学特征和地层水特征等,结合油气水的分布关系及构造、断裂等地质条件,开展实验技术和研究方法攻关,建立气组分分段切割检测和原油轻烃碳同位素分析检测技术,为下步浅层气勘探部署提供了技术支持。主要的成果和认识如下:1.松辽盆地目前发现的浅层气以次生为主,包括原油伴生气(喇嘛甸、杏树岗、新站、四站和朝阳沟地区);原油菌解气(葡南、敖南、西部斜坡区)和高过成熟气(宋站、升平、长春岭等);目前在松辽盆地发现的源岩菌解气仅以显示为主。2.原油伴生气是下伏油层原油经历蒸发作用和气洗作用,通过断裂沟通,在浅层聚集成藏的;除了长垣北、新站、白音诺勒、四站和朝阳沟已见到原油伴生气的地区外,原油伴生气相对较有利区应是古龙凹陷的龙南油田、古龙油田、英台地区及龙虎泡阶地。3.原油菌解气的形成需要地层水由储层或断层与地表水沟通,为微生物生存提供营养;油层与活跃的地层水接触;成藏晚,后期构造活动弱。除已发现的西部斜坡萨尔图油层和长垣南黑帝庙油层外,原油菌解气相对较有利区是敖古拉油气田、龙虎泡油田和葡西油田的萨尔图油层,龙南油田和古龙油田的黑帝庙油层。4.源岩菌解气的形成需要有一定丰度的低熟烃源岩;源岩渗透率相对较高,适合生物生存,可持续供气;后期构造活动较弱,有利于气的保存。现今松辽盆地泥岩渗透率大多数都低于0.1m D,已不适合生成生物气,寻找早期的原生生物气需在构造活动相对较弱的地区,滨北地区断层分布较少,晚期构造活动弱,相对有利的地区是乌裕尔凹陷、富裕构造和黑鱼泡凹陷。5.高—过成熟气需要下伏有深部气源,有断层沟通,晚期构造破坏较小。高—过成熟气与沙河子组烃源岩分布关系密切,主要分布在沙河子烃源岩分布较厚的地区。
[Abstract]:In this paper, aiming at the problems of natural gas genetic type, forming conditions and favorable division of shallow gas in Songliao Basin, the paper focuses on the advanced natural gas analysis technology and research methods at home and abroad. Based on the study of the geochemical characteristics of shallow gas, the physical properties of mudstone, the geochemical characteristics of crude oil and the characteristics of formation water are analyzed. Combined with the distribution of oil, gas and water and geological conditions such as structure and fault, the key problems are solved by experimental techniques and research methods. The techniques of gas component segmentation and carbon isotope analysis of light hydrocarbon in crude oil are established, which provide technical support for the next step of shallow gas exploration and deployment. The main achievements and understandings are as follows: 1. At present, the shallow gas found in Songliao Basin is mainly secondary, including crude oil associated gas (Lamadian, Xingshugang, Xinzheng Station, four stations and Chaoyang ditch area), crude oil bacteriolysis gas (Punan, Aonan, western slope area) and higher than mature gas (Song station, Shengping, Changchun Ridge et al. At present, the source rock bacteria pyrolysis gas found in Songliao Basin is mainly shown as. 2. Crude oil associated gas is accumulated in shallow layers through fault communication through evaporation and gas washing of crude oil in underlying reservoirs; except for areas where crude oil has been associated with gas in Changyuan North, New Station, Baiyinole, four stations and Chaoyang ditch, The relatively favorable areas for crude oil associated gas generation should be Longnan oilfield, Gulong oilfield, Yingtai area and Longhu bubble terrace of Gulong sag. The formation of bacteriolytic gas of crude oil requires formation water to communicate with surface water by reservoir or fault, which provides nutrition for the survival of microorganism; contact between reservoir and active formation water; late reservoir formation; weak late tectonic activity. In addition to the Saltu reservoir and the southern Heidimiao oil layer on the western slope of Changyuan, the relatively favorable areas for the release gas of crude oil bacteria are Oogula oil field, Longhubao oil field and Puxi oil field, and the Heidimiao reservoir of Longnan and Gulong oil fields. The formation of source rock bacteria release gas requires low mature source rock with certain abundance; the source rock permeability is relatively high, suitable for biological survival, sustainable gas supply; the late tectonic activity is weak, which is conducive to gas preservation. Nowadays, the permeability of mudstone in Songliao Basin is less than 0.1m D, which is no longer suitable for biogas generation. In the area where the tectonic activity is relatively weak, the distribution of faults in Binbei area is less, and the late tectonic activity is weak. The relatively favorable areas are the Wuyu Sag, the Fuyu structure and the Blackfish Pao Sag. 5. High-over-mature gas needs deep gas source, fault communication and minor structural damage in the late stage. High-over-mature gas is closely related to the distribution of source rocks in Shahezi formation, which is mainly distributed in areas where the source rocks of Shahezi formation are thicker.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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