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

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.