Abstract: In order to accurately understand the banded sand body distribution and its boundary in the fourth member of Akekule formation of Tahe oilfield, the detailed description of the boundary of the banded sand body is carried out based on the analysis of the sand body genesis. Based on the researches on lithology, grain size and sand body distribution, it is considered that the fourth Member of Akekule formation in the study area was deposited in a littoral-shallow lacustrine environment and the banded sand body is the genesis of littoral-shallow lacustrine sand bars. Seismic attributes sensitive to reservoir are used to identify sand body and seismic waveform is used to describe the sand body boundary. The results show that the RMS amplitude is the attribute sensitive to target sand body in the study area, SP is the reservoir-sensitive logging curve and the SP of the sandstone is less than 24 mV. Based on RMS amplitude sand body prediction and SP seismic motion inversion and combined with drilling data, the reservoir boundary of the fourth member of Akekule formation in Wellblock TK7226 is identified. Finally, the width of the banded sand body in the wellblock is determined as 170-300 m, the oil-bearing area has been ascertained accurately