THE ANALYSIS OF FORMATION MODELS OF LITHOLOGICAL RESERVOIRS ON THREE KINDS OF TYPICAL STRUCTURAL ZONES IN THE ERLIAN BASIN

The sags in Erlian Basin can be divided into three kinds of typical structural zones: steep slope,gentle slope and depression zone.These structural zones have different combination models of accumulation conditions.And the three models of accumulation conditions respectively are: the combination model of accumulation conditions on steep slope,the compounding model of accumulation conditions on genule slope and the combination model of accumulation conditions on depression zone.In addition,different structural zones have different formation models of the lithological reservoirs.They can be summed up as follows: 1) the oil's generating and preserving in same formation on steep slope,2) the oil's generating in a formation and preserving in sideward layer on gentle slope,3)the oil's generating in lower formation and preserving in upper one on depression zone.The three typical models of oil accumulation are the breakthrough of the exploration of the lithological reservoirs in the Erlian Basin at present.