Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (4): 616-623.doi: 10.11743/ogg20120417

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Differences of oil accumulation conditions and patterns in Putaohua play, Sanzhao depression, Songliao Basin

Liu Yunyan   

  1. Northeast Petroleum University, Daqing, Heilongjiang 163318, China
  • Received:2012-04-21 Revised:2012-07-11 Online:2012-08-28 Published:2012-09-11

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Abstract:

Analysis of typical oil reservoirs and hydrocarbon accumulation conditions indicate that there are four major differences of hydrocarbon accumulation and distribution between Putaohua play inside and outside hydrocarbon kitchen in Sanzhao depression.①Oil sources are different.Oil of Putaohua play inside the kitchen is directly sourced from the source rocks in the underlying 1st member of Qingshankou Formation(MQF),while that outside the kitchen is directly sourced from the underlying Fuyang play.②Hydrocarbon migration conditions are different.Oil migration to Putaohua play inside the kitchen are driven by both buoyancy and overpressure and features in short distance and small amount of loss.In contrast,that outside the kitchen is solely driven by buo- yancy,and is characterized by long distance and large amount of loss.③Hydrocarbon accumulation process and patterns are different.For Putaohua play inside the kitchen,oil generated by MQF source rocks migrates to the overlying Putaohua play along the source rock-rooted faults under the driving of overpressure and buoyancy,and accumulates in fault blocks or fault-lithologic traps near the faults.In contrast,for Putaohua play outside the kitchen,oil from Fuyang play migrates to the overlying Putaohua play along the source rock-rooted faults under the driving of buoyancy and accumulates in fault blocks or fault-lithologic traps near the faults.④Controlling factors of hydrocarbon accumulation and distribution are different.Hydrocarbon accumulation and distribution of Putaohua play inside the kitchen is mainly controlled by the distribution of the source rock-rooted faults,while that outside the kitchen is jointly controlled by the distribution of Fuyang play and source rock-rooted faults.

Key words: hydrocarbon accumulation condition, hydrocarbon accumulation pattern, Putaohua play, Sanzhao Depression, Songliao Basin

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