The advantage , in which fault-block oil-gas pools formed in
Wen’an slope which’s oil-gas generated from and gathered in
Paleozoic stratum , is multiple’magmatic active in Oligocene
epoch which made the action of hydrocarbon generated
secondarily in the coal strata of Carboniferous and Permian
markedness. Because the main territorial cap rock which could
block off hydrocarbon migration in another side of fault in
Paleozoic stratum is huge thick mudstone in upper mbr of
Shangshihezi group and Shiqianfeng group , this make only
backward fault to dip direction can block to formfault-block trap
in the reservoir stratum of carbonatite eluvial horizon in
Ordovician and thick sandstone in Permian . Three kinds in
account of five kinds of combination of backward faults to dip
direction could block off to form effective fault-block traps. To
use this mechanism , three exploration targets of Paleozoic oil-gas
fault-block pools are selected.
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