巴音都兰北洼槽阿尔善组沉积相特征及勘探潜力分析

Potential Analysis on Bayinhe Dulan North trough Arxan Sedimentary Facies and Exploration

利用沉积学方法,根据测井、录井、岩心等资料,结合区域地质背景,对巴音都兰凹陷北洼槽阿尔善组沉积相进行研究。通过岩石学标志、测井相标志、相类型以及单井相、连井剖面相分析,识别出研究区域内不同的沉积相类型,认为该区主要发育扇三角洲相,并对各类亚相至微相进行了详细的描述,阿四段为扇三角洲前缘的河口坝,阿三段为扇三角洲平原的分流河道。在单井相划分和连井相对比的基础之上,确定了研究工区沉积相的展布范围和平面展布特征,认为巴音都兰北洼槽的东部陡断层和西部斜坡区在阿尔善组发育了两排较为相连的扇三角洲群,扇体群之间发育条带状的滨浅湖亚相。根据沉积、构造研究成果,结合试油、试采资料,从油藏的成藏规律出发,进一步明确了勘探潜力方向,提出了下步巴音都兰北洼槽有利勘探目标。

Using the method of sedimentology, based on linelogging, mudlogging, core data, combined with regional geological background, the Ba Induran depression North trough Arxan sedimentary facies research. Through petrology symbol, linelogging facies, facies and single well facies analysis, connecting well section, to identify different types of sedimentary facies in the study area think, this area mainly developed fan delta facies, and various types of subfacies and microfacies are described in detail, a four section of fan delta front mouth bar, a section of the distributary channel of fan delta plain. Based on the single well facies and well contrast, determined the study area, the distribution range of deposition phase and plane distribution characteristics, that the Bayin Dulan trough in eastern North and steep fault in western slope of Arxan development in the two row is connected to the fan delta group, between the fan group development a shallow lake belt Subfacies. Sedimentary and structural research results, combined with the oil test, production test data, the reservoir forming rules of, to further clarify the direction of exploration potential, and puts forward the next step in Bayindulan North subsag favorable exploration tar gets.