大型凹陷源外斜坡区油运聚成藏模式——以松辽盆地长10地区扶余油层为例
|
摘要
松辽盆地长10地区为典型凹陷斜坡区有效烃源岩外成藏。通过岩心、测井和地震等资料对扶余油层油气来源、砂体展布、构造特征和油水分布等成藏因素的分析认为:油均来自三肇凹陷向斜区的青一段源岩;T2断层具有平面条带状特征,成藏期活动的油源断层多为密集带边界断层;扶余油层为西南保康物源影响下的河控三角洲,微相类型主要为分流河道,且垂向上发育先水退、后水进的沉积序列;油垂向分布在扶余油层顶部,受凹陷源外斜坡区供油不足的影响,油自构造低部位向高部位呈"台阶状"分布。扶余油层成藏模式为三肇凹陷青一段源岩生成的油在超压作用下通过油源断层向扶余油层"倒灌"运移,然后在浮力作用下,沿着水退最大期(扶Ⅰ组底)发育的河道砂体匹配油源断层组成优势输导通道(断层密集带),远距离侧向运移,因此斜坡区油在平面上富集于断层密集带附近,垂向上位于优势输导层位之上(扶Ⅰ组)。
Chang 10 area is of the typical accumulation outside effective hydrocarbon source on slope of depression.The cores,well loggings and seismic data were used to analyze the main controlling factors such as oil origin,sand body distribution,structural features and oil and water distribution.The result shows that oil was generated from syncline source rocks of the first member of Qingshankou Formation in Sanzhao Sag;T2 fault concentrates into belts in plane,and oil sources faults that was active accumulation are border faults around concentrated belts;Fuyu oil layer developed river-dominated delta under Baokang source from southwest,and microfacies were mainly distributary channels with a sedimentary evolution of reliction to transgression overlaying in vertical;oil was distributed on the top of Fuyu oil layer in vertical,and decreased from structurally low position to high position,distributing in step shape,under the effect of insufficient supply on the slope.Accumulation mode is that oil which was generated from source rock in the first member of Qingshankou Formation first downward migrated to Fuyu oil layer through oil-source faults under the action of overpressure,then laterally migrated through preferential migration pathways formed by matching between channel sand developed during the largest retrogradation(bottom of FuⅠ) and oil faults under the action of buoyancy,and oil accumulated in fault-concentrated belts in plane while distributed in upper preferential transforming layers in the vertical.
Chang 10 area is of the typical accumulation outside effective hydrocarbon source on slope of depression.The cores,well loggings and seismic data were used to analyze the main controlling factors such as oil origin,sand body distribution,structural features and oil and water distribution.The result shows that oil was generated from syncline source rocks of the first member of Qingshankou Formation in Sanzhao Sag;T2 fault concentrates into belts in plane,and oil sources faults that was active accumulation are border faults around concentrated belts;Fuyu oil layer developed river-dominated delta under Baokang source from southwest,and microfacies were mainly distributary channels with a sedimentary evolution of reliction to transgression overlaying in vertical;oil was distributed on the top of Fuyu oil layer in vertical,and decreased from structurally low position to high position,distributing in step shape,under the effect of insufficient supply on the slope.Accumulation mode is that oil which was generated from source rock in the first member of Qingshankou Formation first downward migrated to Fuyu oil layer through oil-source faults under the action of overpressure,then laterally migrated through preferential migration pathways formed by matching between channel sand developed during the largest retrogradation(bottom of FuⅠ) and oil faults under the action of buoyancy,and oil accumulated in fault-concentrated belts in plane while distributed in upper preferential transforming layers in the vertical.
引文
[1]Hindle A D.Petroleum migration pathways and change concentration:A3-dimensional model[J].AAPG Bulletin,1997,81:1451-1481.
[2]赵文智,邹才能,汪泽成,等.富油气凹陷“满凹含油”论内涵与意义[J].石油勘探与开发,2004,31(2):5-13.
[3]李明诚.油气运移基础理论与油气勘探[J].地球科学,2004,29(4):379-383.
[4]杨伟荣,钱铮,张欣,等.冀中地区文安斜坡带成藏特征研究[J].岩性油气藏,2008,20(3):49-52.
[5]潘树新,王天琦,田光荣,等.松辽盆地扶杨油层成藏动力探讨[J].岩性油气藏,2009,21(2):126-132.
[6]付广,李卉,徐衍彬.三肇凹陷及周边地区葡萄花油层源-圈空间配置及油运移输导形式[J].岩性油气藏,2010,22(1):18-22.
[7]潘树新,卫平生,袁剑英,等.论油气运移的“高速公路”及源外找油思想[J].沉积学报,2011,29(3):599-604.
[8]李延平,陈树民,宋永忠,等.大庆长垣及以东泉三、四段扶杨油层浅水湖泊——三角洲体系沉积特征[J].大庆石油与开发,2005,24(5):13-16.
[9]冯子辉,李景坤,要丹.朝阳沟油田原油地球化学特征及油源探讨[J].大庆石油与开发,1994,13(4):23-26.
[10]刘宗堡,付晓飞,吕延防,等.大型凹陷向斜区油气倒灌式成藏——以松辽盆地三肇凹陷扶杨油层为例[J].地质论评,2009,55(5):685-692.
[11]罗群.断裂控烃理论与油气勘探实践[J].地球科学——中国地质大学学报,2002,27(6):751-756.
[12]张雷,卢双舫,张学娟,等.大庆长垣及以东地区泉头组三、四段重矿物特征及沉积体系分析[J].大庆石油学院学报,2010,34(1):10-13.
[13]刘宗堡,吕延防,付晓飞,等.三肇凹陷扶余油层沉积特征及油气成藏模式[J].吉林大学学报:地球科学版,2009,39(6):998-1006.
[2]赵文智,邹才能,汪泽成,等.富油气凹陷“满凹含油”论内涵与意义[J].石油勘探与开发,2004,31(2):5-13.
[3]李明诚.油气运移基础理论与油气勘探[J].地球科学,2004,29(4):379-383.
[4]杨伟荣,钱铮,张欣,等.冀中地区文安斜坡带成藏特征研究[J].岩性油气藏,2008,20(3):49-52.
[5]潘树新,王天琦,田光荣,等.松辽盆地扶杨油层成藏动力探讨[J].岩性油气藏,2009,21(2):126-132.
[6]付广,李卉,徐衍彬.三肇凹陷及周边地区葡萄花油层源-圈空间配置及油运移输导形式[J].岩性油气藏,2010,22(1):18-22.
[7]潘树新,卫平生,袁剑英,等.论油气运移的“高速公路”及源外找油思想[J].沉积学报,2011,29(3):599-604.
[8]李延平,陈树民,宋永忠,等.大庆长垣及以东泉三、四段扶杨油层浅水湖泊——三角洲体系沉积特征[J].大庆石油与开发,2005,24(5):13-16.
[9]冯子辉,李景坤,要丹.朝阳沟油田原油地球化学特征及油源探讨[J].大庆石油与开发,1994,13(4):23-26.
[10]刘宗堡,付晓飞,吕延防,等.大型凹陷向斜区油气倒灌式成藏——以松辽盆地三肇凹陷扶杨油层为例[J].地质论评,2009,55(5):685-692.
[11]罗群.断裂控烃理论与油气勘探实践[J].地球科学——中国地质大学学报,2002,27(6):751-756.
[12]张雷,卢双舫,张学娟,等.大庆长垣及以东地区泉头组三、四段重矿物特征及沉积体系分析[J].大庆石油学院学报,2010,34(1):10-13.
[13]刘宗堡,吕延防,付晓飞,等.三肇凹陷扶余油层沉积特征及油气成藏模式[J].吉林大学学报:地球科学版,2009,39(6):998-1006.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心