Research on oil accumulation law in combination of lower source rock and upper reservoir in small fault depression lake basin：An example from K1d in main central rifts of Haita Basin
Based on the dissection of oil reservoirs and the study of space matching relation between oil reservoirs and oil accumulation conditions, it is considered that oil reservoirs are mainly fault oil reservoirs in main central rifts of Haita Basin, and mainly distributed in reversal structures and around long-term developing faults. Oil accumulation and distribution of K1d are mainly controlled by the following factors: ①Distribution areas of K1n1 source rock control the areas of oil accumulation and distribution ofK1d;②Reversal structures are favorable places for oil accumulation of K1d; ③Sand bodies of braided delta front provide favorable reservoir space for oil accumulation of K1d; ④Long-term developing faults not only provide pathways for oil migration ofK1n1 toK1d, but also provide structural background for oil accumulation of K1d. Oil accumulation models of K1d are that oil from K1n1 migrated to K1d by long-term developing faults under the action of buoyancy and accumulated in fault block or fault-lithologic traps in and around reversal structures.
FU Guang , HAN Na . Research on oil accumulation law in combination of lower source rock and upper reservoir in small fault depression lake basin：An example from K1d in main central rifts of Haita Basin[J]. Lithologic Reservoirs, 2011 , 23(5) : 5 -8 . DOI: 10.3969/j.issn.1673-8926.2011.05.002
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