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在前人区域沉积环境研究成果的基础上,通过对鄂尔多斯盆地张韩地区长8_2油层钻井、录井、测井以及岩心样品等资料进行综合研究,以岩石相标志及测井相分析为基础,采用沉积学原理和方法对张韩地区长8_2油层的沉积环境进行了系统分析。结果表明,张韩地区长8_2油层为三角洲沉积体系,主要发育了三角洲前缘亚相,可进一步划分出三种沉积微相:水下分流河道、河口坝和支流间湾,水下分流河道微相为储层骨架砂体。同时对沉积微相与油气成藏进行了分析,认为有利的沉积相带控制了油气运移和聚集,三角洲前缘水下分流河道微相是油气聚集的主要场所,也是下一步张韩地区长8_2油藏勘探开发的方向。
Based on the research results of sedimentary environment in the predecessor area, by comprehensively studying the drilling, logging, well logging and core sample data of Chang 8_2 reservoir in Zhanghan area of Ordos Basin, based on the lithofacies markers and log facies analysis, The depositional environment of Chang 8_2 reservoir in Zhanghan area was systematically analyzed using sedimentology principles and methods. The results show that the Chang 8_2 reservoir in Zhanghan area is a deltaic sedimentary system and mainly developed delta front facies, which can be divided into three sedimentary microfacies: underwater distributary channel, estuary dam and tributary bay, underwater distributary channel micro Phase for the reservoir skeleton sand body. At the same time, the sedimentary microfacies and hydrocarbon accumulation are analyzed. It is considered that the favorable sedimentary facies control the migration and accumulation of oil and gas. The microfacies of submarine distributary channel in the delta front are the main sites for hydrocarbon accumulation, 8_2 Reservoir exploration and development direction.