针对欢喜岭油田稳产基础薄弱、探矿权面积变小的现状,寻找油气商业经济储量、增强持续稳产储量保障日益重要,积极开展特殊岩性油藏勘探研究势在必行。利用钻井、测井、录井、岩心及地震解释等资料,对齐家火山岩成因、油藏特征进行精细描述,从油气成藏要素和完钻井产能方面探讨了齐家地区火山岩油藏勘探潜力。研究表明:齐家火山岩岩性复杂,具有3期结构,即安山岩斑状结构、基质间粒间隐结构,玄武岩气孔斑状结构、辉长结构,凝灰岩火山凝灰结构。火山岩油藏储层特征以风化壳为主,储集空间包括孔隙和裂隙双重介质;火山岩油藏勘探潜力集中在北段靠近西侧断层附近;油藏富集受岩性、构造形态、风化壳发育等因素控制。综合研究认为,齐家火山岩油藏产能较好,产能与岩性、构造及储集空间发育相关性很强。研究结果对齐家火山岩的深入勘探具有一定的指导意义,对其他类似地区的火山岩勘探开发有一定的借鉴意义。
In view of existing problems of poor stable production and reduced areas covered by prospecting rights in Huanxiling Oilfield, it is increasingly important to seek for commercially economic reserves of oil and gas reservoirs and to enhance the support to sustainable stable production, and it is imperative to actively study the exploration of special lithological reservoirs. The genesis and reservoir characteristics of volcanic rock in Qijia Area were described in detail based on the data of drilling, logging, core and seismic interpretation, and the exploration potential of volcanic reservoir in Qijia Area was discussed from the aspects of hydrocarbon accumulation factors and completion well productivity patterns. It was found in the study that the lithology of the volcanic rocks in Qijia Area was complex, with three stages of texture, namely, andesite porphyritic texture, intermatrix intergranular hidden texture, basalt stomatal porphyritic texture, gabbro texture and tuff volcanic tuffaceous texture. The reservoir characteristics of the volcanic reservoir were dominated by weathered crust, and the reservoir space included both pore and fracture media; the exploration potential of the volcanic reservoir was concentrated in the northern section near the western fault; the reservoir enrichment was controlled by lithology, tectonic morphology, weathered crust development and other factors. The study concluded that the volcanic reservoir in Qijia Area had a good productivity which was strongly correlated with lithology, tectonics and reservoir space development. The study results can be used as a reference for the in-depth exploration of the volcanic rocks in Qijia Area and as guidance for the exploration and development of volcanic rocks in other similar areas.
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