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笔者通过关键井的岩性、测井相和地震相的研究 ,认为东营凹陷广北地区的下第三系沙四段为滨湖亚相的砂坝、砂泥混合滩、泥滩等微相以及浅湖亚相的远砂坝、席状砂、浅湖泥等微相构成的滨浅湖沉积体系 ;由老到新的垂向上沉积演化为浅湖亚相 (ES6 4) 滨湖亚相 (ES34,ES4 4 ,ES54 ) 浅湖亚相 (ES14 ,ES24 ) ,反映出水进 水退 水进的沉积旋回。通过地震剖面的对比和地震相的解释 ,建立了各沉积微相与地震相的对应关系。探讨不同沉积微相砂体中油气的富集规律。
Based on the study of lithology, log facies and seismic facies of key wells, the authors believe that the lower Es4 in the Guangbei area of Dongying depression is composed of sand bars, sand and mud mixing beaches, mudflats, The shallow and shallow lake subfacies (ES34) lakefront subfacies (ES34) are formed by the vertical up-deposition from the new to the new, , ES4 4, ES54) shallow lake subfacies (ES14, ES24), reflecting the sedimentary cycle of water inflow back into the water. Through the comparison of seismic profiles and interpretation of seismic facies, the corresponding relationship between sedimentary microfacies and seismic facies is established. To explore the law of enrichment of oil and gas in different sedimentary microfacies.