大情字井油田南部青三段沉积微相及其含油性研究

Study on Eq_3 Sedimentary Microfacies and Its Oil-bearing Property in the South of Daqingzijing Oilfield

大情字井油田南部青三段,是油田勘探的主要目的层段之一。根据岩石的颜色、岩性、粒度、岩石的结构、沉积构造及测井相标志,研究表明研究区青三段为三角洲平原亚相。并进一步识别出分流河道、决口扇、河道溢岸砂体及分流间湾等4个沉积微相,恢复了各小层沉积微相的平面展布规律。在此基础上,就沉积微相对油气聚集的控制作用进行分析。

Eq3 in the south of Daqingzijing Oilfield was one of the main target zones for oilfield exploration.Therefore it was of great significance for oilfield exploration and development by correctly restoring the type of sedimentary microfacies and its areal distribution and studying the relationship between the sedimentary microfacies and oil-gas distribution.The sedimentary facies signs used for study includes rock colour,lithology,particle size,rock structure,sedimentary tectonics and log facies,the study reveals that Eq3 in the studied area is a delta plain subfacies,and 4 sedimentary microfacies such as distributary channel,crevasse splays,river overflows shore sand body and distributary bay are further identified and plain distribution rules of the sedimentary microfacies in each layer are restored on the basis stated above,the control of sedimentary microfacies on oil and gas accumulation is analyzed.