关键词: 准噶尔盆地, 沙窝地, 岩性圈闭, 成因, 识别

Abstract: Lithologic trap is the most important type of traps in Shawodi area of Junggar basin. This paper presents the model of Shawodi litho-logic-trap reservoir. In light of the factors of petroleum accumulation, it is a reservoir probably accumulated together with palaeohigh and sedi-mentary sand bodies with characteristics of unobvious late reconstruction and primary accumulatiou. Synthetic seismogram is used for calibra-tion of the stratigraphic units. Available lithologic reservoir models and suchr techuiques as conventional seismic facies recognition, seismic at-tribute pickup and well log-constrained seismic inversion are applied for prediction of the sand bodies. The results show that in studied area the second menber of Sangonghe formation is the potential reservoir, demonstrating the existence of the channel sand body in delta frontal facies; in western sag of Peng-1 Well develop several palaeohighs, which are the favorable areas for long term hydrocarbon migration; in slope facies belt occur Jurassic delta sand bodies, which may help to shape litho-structaral oil-gas reservoir; and the low-amplitude structure and lithologic trap in hinterland of Junggar basin should be as major targets for hydrocarbon prospecting.

Key words: Junggar basin, Shawodi, lithologic trap, origin, recognition