The Junggar Basin In Western Unconformable Relations With The Oil And Gas Migration And Accumulation

According to material of seism, log, well logging , geochemistry and so on, on the basis of expounding the characteristics as unconformity type and control oil characteristics, unconformity structure type and oil-gas migration—accumulation characteristics, evidence of the oil—gas migration along unconformity, aspect of oil—gas migration,degrees of becoming reservoir, reservoir pattern of the unconformity—fault migration—accumulation system, etc., at Luxi area, it is pointed out in the paper that the principal type of unconformity are onlap/erosional truncation type, concordance/erosional truncation type, concordance/concordance type. The onlap/erosional truncation type and concordance /erosional truncation type are best of all favorableness for the accumulation of oil and gas among them. The structure layer of unconformity is divided for six types, the types of I and II are best of all favorableness for the migration and accumulation of oil and gas among them. The migration of oil and gas only in the slope of Luxi at top boundary unconformity of the series of all strata of Permian system and at top boundary unconformity of Triassic system, the migration of oil and gas mostly in the uplift of Luxi at top boundary unconformity of Xishanyao group and Jurassic system.Via Shixi heave,oil-gas migrated from of Pen 1 well hollow to Luliang heave .oil-gas had three degrees of become reservoir. There are two kinds reservoir pattern: first is side of source—unconformity —slopes—zone type, second is outside source—unconformity-fault control-steps type in this region. It was considered finally that the favorable object area of stratum reservoir have relations with unconformity located at the slope area of Luxi, the area between Shangequan and Shinan oil field, the south member of Shannan depression in this region.