松辽盆地十屋断陷深层油气成藏过程与模式

松辽盆地十屋断陷深层油气藏经历了多期成藏与多期演化,根据烃源岩生排烃史模拟结合储层流体包裹体分析,十屋断陷深层油气藏主要经历了3期油气成藏过程,登娄库期末是早期原生油气藏的主要形成期,以形成油藏为主;泉头期末是十屋断陷深层油气藏大规模形成期,形成的油藏和气藏并重,早期油气藏继续接受本区成熟源岩生成的油气而不断扩大,同时早期原油在此阶段逐渐裂解成气;嫩江期末十屋断陷深层油气藏强烈改造,以形成次生油气藏和大量天然气藏为主。十屋断陷发育2类油气成藏模式:一类是中央隆起带"多期成藏中晚期强调整型"油气成藏模式,这是十屋断陷的主要成藏模式;另一类是位于深凹带和斜坡带"早期成藏晚期弱调整型"油气成藏模式。

Hydrocarbon Reservoir-forming Processes and Patterns in Deep Strata of Shiwu Fault Depression in the Songliao Basin

Deep reservoirs of Shiwu fault depression in the Songliao Basin experienced multi-stage hydrocarbon accumulation and multi-stage evolutions.Basin simulation of hydrocarbon generation and expulsion history of source rock and reservoir fluid inclusion analysis show three periods of reservoir forming.Primary oil-gas pools formed at the end of Denglouku period.At the end of Quantou period,many kinds of oil and gas pools formed on a large scale.Former oil-gas pools enlarged with continuous charging of hydrocarbons generating by local mature source rocks,and the former crude oils cracked into gases.At the end of Nenjiang period,primary oil and gas pools reconstructed intensively.A lot of gas pools and secondary oil-gas pools were formed in this period.Two different accumulation patterns are developed in the Shiwu fault depression.One pattern is developed in central uplift called multi-stage forming and middle-late-stage strong adjustment's type,and another pattern is developed in deep zones and slopes called early-stage forming and late-stage weak adjustment's type.