陆西凹陷九佛堂组有效储层预测

发布时间：2018-10-10 16:06

【摘要】：陆西凹陷是辽河外围盆地勘探程度最高、勘探效果最好的凹陷,随着勘探的不断深入,勘探难度越来越大,构造油气藏在本世纪八十年代几乎都已经被发现,目前该区勘探开发的重点主要是寻找构造岩性油气藏或岩性油气藏,五十家子庙洼陷及周边地区勘探程度相对较低,而且是典型的岩性油气藏发育区,在近几年勘探中也取得了重大突破。然而在进一步研究过程中遇到诸多困难,首先是九佛堂组上段单层砂体薄,多为2～12m,依托地震资料为主的常规波阻抗反演识别薄储层难度很大;另外这一地区九佛堂组下段普遍发育凝灰质砂岩、局部地区还发育火山碎屑岩等特殊岩性,使之识别有利岩性及开展裂缝预测难度很大。针对上述的问题,本次研究充分利用现有资料对该地区进行了精细构造解释的基础上,利用测井曲线的处理和重构,针对不同类型的特殊储层开展叠后和叠前联合反演以及多属性分析等研究工作。针对九佛堂组上段(简称九上段)薄层砂体,由于目的层砂体在纵向上与上下泥岩层阻抗非常接近,利用常规声波时差开展薄储层反演精度很低而且很难分辨,通过测井曲线敏感参数交汇分析,发现在本地区深侧向电阻曲线对薄层砂体响应更为敏感,利用拟声波曲线重构技术进行波阻抗反演,实现提高分辨薄层能力,并精确雕刻出多个砂体;对于九佛堂组下段(简称九下段)火山碎屑岩储层,采用叠前、叠后联合反演、多属性分析等技术,刻画火山碎屑岩分布范围,并根据储层特点选择合理的方法预测裂缝发育区。利用该研究结果进行了生产上井位部署和钻井实施,取得了很好的效果,并建立一套适合该地区特点的有效储层预测技术方法,同时对辽河外围其它凹陷及地质特征相类似地区的储层预测具有重要指导意义。
[Abstract]:Luxi sag is the highest exploration degree and the best exploration effect in the peripheral basin of Liaohe. With the deepening of exploration, the exploration is becoming more and more difficult, and almost all structural reservoirs have been discovered in the 1980s. At present, the focus of exploration and development in this area is mainly to find structural lithologic reservoirs or lithologic reservoirs. The exploration degree in and around the Shijiazimiao sag is relatively low, and it is a typical lithologic oil and gas reservoir development area. Major breakthroughs have also been made in exploration in recent years. However, in the process of further study, there are many difficulties. Firstly, the upper member of Jiufutang formation is thin, mostly 212m. It is very difficult to identify thin reservoir by conventional wave impedance inversion based on seismic data. In addition, tuffaceous sandstone is generally developed in the lower member of Jiufutang formation in this area, and special lithology such as pyroclastic rocks are developed in some areas, which makes it difficult to identify favorable lithology and to predict fractures. In view of the above problems, this study makes full use of the existing data to interpret the fine structure of the area, and utilizes the processing and reconstruction of logging curves. The joint inversion and multiple attribute analysis are carried out for different types of special reservoirs. For the thin sand body of the upper member of Jiufutang formation, because the impedance of the target sand body is very close to that of the upper and lower mudstone strata, the inversion accuracy of thin reservoir developed by conventional sonic time difference is very low and difficult to distinguish. By analyzing the intersection of sensitive parameters of logging curve, it is found that the deep lateral resistance curve is more sensitive to the response of thin layer sand body in this area. The wave impedance inversion is carried out by using pseudo acoustic curve reconstruction technique to improve the resolution ability of thin layer. For the volcanic clastic rock reservoirs in the lower member of the Jiufutang formation, the prestack, post-stack joint inversion, multi-attribute analysis and other techniques are used to depict the distribution of pyroclastic rocks. According to the reservoir characteristics, reasonable methods are selected to predict the fracture development area. The results of this study are used to plan the production well location and to carry out drilling, and good results have been obtained, and a set of effective reservoir prediction techniques suitable for the characteristics of this area have been established. At the same time, it has important guiding significance for reservoir prediction in other sag around Liaohe River and similar geological features.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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