中非Muglad盆地1/2/4区块白垩系构造特征与油气分布
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摘要
中非Muglad盆地由多个以中生代沉积为主的裂谷凹陷组成,各凹陷分割性强,有独立的构造和沉积体系。通过对Muglad盆地1/2/4区块多个构造层系的地震层位解释及构造演化剖面的制作,分析了构造演化特征、断裂特征以及油气聚集的关系。研究区发育5条较大的呈NW向展布的同沉积断裂和东部两条呈NNW向延伸的盆地边界断裂,构造格局主要受这两组断裂控制,白垩系构造格局具有继承性。东部构造带受NW和NNW向正断层控制,西部构造带主要受NW向断裂控制;东、西分带明显,具"一隆二凹两斜坡"的特征,南、北成藏具有分区特点,北部主要为Abu Gabra(AG)组及Bentiu和Aradeiba组成藏组合,南部以Bentiu和Aradeiba组成藏组合为主。Kaikang凹陷东、西两侧盆地结构及构造演化差异,造成两侧油气丰度的不同。
Muglad Basin formed by a number of rift sags domained by mesozoic sendiment,the sags are relatively independent with separate tectonic systems and sedimentary systems.After seismic horizons interpretation and structure evolution profile mapping at many structural strata at 1/2/4 blocks in Muglad Basin,we analyzed the relationship among structural evolution characteristics,faults features and hydrocarbon accumulation.There are five major contemporaneous faults along NW direction and two boundary faults along NNW direction in the eastern of the study area.The frame of the 1/2/4 blocks structure is controlled by the two groups of faults,and the Cretaceous depressions and uplifts were featured by inheritance.The structural belt is controlled by NNW faults in the east,and controlled by NW faults in the west.The eastern and western structural belts are easily distinguished.The two structural are characterized by the tectonic framework of "one uplift,two sub-depression and two slopes" and have different hydrocarbon accumulation zones in northern and southern.Hydrocarbon is mainly distributed at Abu Gabra(AG)group,Bentiu and Aradeiba group in the northern and at Bentiu & Aradeiba group in the southern.The different hydrocarbon abundance of both sides of the Kaikang depressed was due to the difference basin structrue and tectonic evolution between the east side and the west one.
Muglad Basin formed by a number of rift sags domained by mesozoic sendiment,the sags are relatively independent with separate tectonic systems and sedimentary systems.After seismic horizons interpretation and structure evolution profile mapping at many structural strata at 1/2/4 blocks in Muglad Basin,we analyzed the relationship among structural evolution characteristics,faults features and hydrocarbon accumulation.There are five major contemporaneous faults along NW direction and two boundary faults along NNW direction in the eastern of the study area.The frame of the 1/2/4 blocks structure is controlled by the two groups of faults,and the Cretaceous depressions and uplifts were featured by inheritance.The structural belt is controlled by NNW faults in the east,and controlled by NW faults in the west.The eastern and western structural belts are easily distinguished.The two structural are characterized by the tectonic framework of "one uplift,two sub-depression and two slopes" and have different hydrocarbon accumulation zones in northern and southern.Hydrocarbon is mainly distributed at Abu Gabra(AG)group,Bentiu and Aradeiba group in the northern and at Bentiu & Aradeiba group in the southern.The different hydrocarbon abundance of both sides of the Kaikang depressed was due to the difference basin structrue and tectonic evolution between the east side and the west one.
引文
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[13]窦立荣,潘校华,田作基,等.苏丹裂谷盆地油气藏的形成与分布——兼与中国东部裂谷盆地对比分析[J].石油勘探与开发,2006,33(3):255-261Dou L R,Pan X H,Tian Z J,et al.Hydrocarbon for-mation and distribution of rift basins in Sudan:acomparative analysis of them with rift basins in EastChina[J].Petroleum Explocation and Development,2006,33(3):255-261
[14]付广,黄劲松,康德江,等.源断裂在油气成藏与分布中的作用研究——以贝尔凹陷布达特群潜山为例[J].石油物探,2006,45(5):459-463Fu G,Hang J S,Kang D J,et al.Influence of sourcefaults of Budate group In Beier depression on petro-leum reservoir formation and distribution[J].Geo-physical Prospecting for Petroleum,2006,45(5):459-463
[15]刘和浦,李晓清,刘立群,等.伸展构造与裂谷盆地成藏区带[J].石油与天然气地质,2005,26(5),537-551Liu H F,Li X Q,Liu L Q,et al.Petroleum plays inrift basin and extensional structures[J].Oil&GasGeology,2005,26(5):537-551
[2]张亚敏.中非Muglad盆地北区构造特征[J],石油勘探与开发,2007,34(4):502-506Zhang Y M.Structural geometry of Muglad Basin,Central Africa[J].Petroleum Explocation and Devel-opment,2007,34(4):502-506
[3]童晓光,窦立荣,田作基,等.苏丹穆格莱特盆地的地质模式和成藏模式[J].石油学报,2004,25(1):19-24Tong X G,Dou L R,Tian Z J,et al.Geological modeand hydrocarbon accumulation mode in Muglad pas-sive rift basin of Sudan[J].Acta Petrolei Sinica,2004,25(1):19-24
[4]Genik G J.Petroleum geology of Cretaceous_Tertia-ry rift basins in Niger,Chad,and Central AfricanRepublic[J].AAPG,1993,77(8):1405-1434
[5]张亚敏,漆家福.穆格莱德盆地构造地质特征与油气富集[J].石油与天然气地质,2007,28(5):669-674Zhang Y M,Qi J F.Structural geological character-istics and hydrocarbon enrichment of Muglad Basin[J].Oil&Gas Geology,2007,28(5):669-674
[6]魏永佩,刘池阳.位于巨型走滑断裂端部盆地演化的地质模型——以苏丹穆格莱德盆地为例[J].石油实验地质,2003,25(2):129-136,142Wei Y P,Liu C Y.Geological model of the MugladBasin—an identical example of Basin evolution at theend of Giant Strike-slip faults[J].Petroleum Geolo-gy&Experiment,2003,25(2):129-136,142
[7]张亚敏,陈发景.穆格莱德盆地形成特点及勘探潜力[J].石油与天然气地质,2002,23(3):236-240Zhang Y M,Chen J F.The development feature andhydrocarbon exploration potential in Muglad Basin[J].Oil&Gas Geology,2002,23(3):236-240
[8]汪望泉,窦立荣,樊太亮,等.中非穆格莱德盆福拉凹陷构造特征与油气聚集[J].新疆石油地质,2007,28(3):387-390Wang M Q,Dou L R,Fan T L,et al.Structural andHydrocarbon Accumulation in Fula Sag of MugladBasin in Central Africa[J].Xinjiang Petroleum Geol-ogy,2007,28(3):387-390
[9]Yang M H,Liu C Y,Zhao H G,et al.Sedimentaryfills and hydrocarbon potential of riftbasin:a casestudy from the Muglad basin,Sudan[J].Journal ofNorthwest University(Natural Science Edition),2001,31(2):162-166
[10]窦立荣,张志伟,程顶胜.苏丹Muglad盆地区域盖层对油藏特征的控制作用[J].石油学报,2006,27(3):22-25Dou L R,Zhang Z W,Cheng D S.Regional seal con-trol on oil accumulation in Muglad Basin of Sudan[J].Acta Petrolei Sinica,2006,27(3):22-25
[11]高东.十屋断陷含油气系统及勘探潜力分析[J].石油物探,2004,43(2):196-201Gao D.Petroleum System and Analysis on Explora-tion Potentia of Hydrocarbon in Shiwu Depression[J].Geophysical Prospecting for Petroleum,2004,43(2):196-201
[12]张亚敏.苏丹国穆格莱德盆地构造特征及演化[J],西安石油大学学报(自然科学版),2008,23(3):38-40Zhang Y M.Structure characteristic and evolution inMuglad Basin of Sudan[J].Journal of Xi’an ShiyouUniversity(Natural Science Edition),2008,23(3):38-40
[13]窦立荣,潘校华,田作基,等.苏丹裂谷盆地油气藏的形成与分布——兼与中国东部裂谷盆地对比分析[J].石油勘探与开发,2006,33(3):255-261Dou L R,Pan X H,Tian Z J,et al.Hydrocarbon for-mation and distribution of rift basins in Sudan:acomparative analysis of them with rift basins in EastChina[J].Petroleum Explocation and Development,2006,33(3):255-261
[14]付广,黄劲松,康德江,等.源断裂在油气成藏与分布中的作用研究——以贝尔凹陷布达特群潜山为例[J].石油物探,2006,45(5):459-463Fu G,Hang J S,Kang D J,et al.Influence of sourcefaults of Budate group In Beier depression on petro-leum reservoir formation and distribution[J].Geo-physical Prospecting for Petroleum,2006,45(5):459-463
[15]刘和浦,李晓清,刘立群,等.伸展构造与裂谷盆地成藏区带[J].石油与天然气地质,2005,26(5),537-551Liu H F,Li X Q,Liu L Q,et al.Petroleum plays inrift basin and extensional structures[J].Oil&GasGeology,2005,26(5):537-551
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