鄂尔多斯盆地姬塬地区上三叠统坡折带、斜坡类型与油藏的关系
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摘要
通过盆地边界性质、沉积相类型、地层厚度、沉积序列与砂体空间组合特征及砂岩的粒度变化与物性的研究,结合地震相对姬塬地区上三叠统延长组长4+5—长7油层组湖盆古地貌的恢复结果,认为鄂尔多斯盆地西北缘、西缘、西南缘、东南缘的沉积边界受构造控制,属于构造坡折带,形成以冲积扇、扇三角洲、辫状河三角洲共同发育的沉积格局;盆地东北缘和北缘为扰曲宽缓盆地边缘性质,属于沉积坡折带,发育缓坡曲流河三角洲沉积体系。姬塬地区三角洲前缘可划分为坡型前缘和台型前缘两种斜坡带类型。位于坡型前缘的砂体厚度大、物性好,是低渗背景上相对高渗带发育区,为油藏聚集的有利场所。该成果为在大型坳陷型盆地中寻找三角洲相隐蔽油气藏提供了新的研究思路与勘探方向。
The northwestern,western,southern and southeastern depositional margin of the Ordos basin is tectonic slope-break controlled by tectonic movement occurred at the end of the Triassic,where alluvial,fan-deltaic and braided-deltaic sedimentary suite developed.While the eastern and northeastern margin belong to depositional slope-break because of its gently uplifting during the late Triassic,which resulted in the meandering-deltaic sedimentary system.Two types of slopes including slope-shaped-front and platform-front can be recognized in the Jiyuan area,northwestern Ordos Basin,based upon analysis on feature of the basin margin,types of depositional facies and sediments,thickness of the strata,spatial assemblage and distribution of the sandstone bodies,and changes of the sandstone grain size,combined with seismic interpretation for topographic form of the Chang 4 + 5-Chang 7 lake basin.Research result shows that sandstones at the slope-shaped-front are of greater thickness with relatively developed secondary dissolution pores and higher permeability values in delta front setting where sandstones tend to be of low porosity and very low permeability.Thus,sandstones at the slope-shaped-front with the better reservoir potential in Jiyuan area are optimistic regions for hydrocarbon accumulation.This study will provide a new idea and a fresh approach to explore and search for hidden oil pools at a delta depositional system in depression basins.
The northwestern,western,southern and southeastern depositional margin of the Ordos basin is tectonic slope-break controlled by tectonic movement occurred at the end of the Triassic,where alluvial,fan-deltaic and braided-deltaic sedimentary suite developed.While the eastern and northeastern margin belong to depositional slope-break because of its gently uplifting during the late Triassic,which resulted in the meandering-deltaic sedimentary system.Two types of slopes including slope-shaped-front and platform-front can be recognized in the Jiyuan area,northwestern Ordos Basin,based upon analysis on feature of the basin margin,types of depositional facies and sediments,thickness of the strata,spatial assemblage and distribution of the sandstone bodies,and changes of the sandstone grain size,combined with seismic interpretation for topographic form of the Chang 4 + 5-Chang 7 lake basin.Research result shows that sandstones at the slope-shaped-front are of greater thickness with relatively developed secondary dissolution pores and higher permeability values in delta front setting where sandstones tend to be of low porosity and very low permeability.Thus,sandstones at the slope-shaped-front with the better reservoir potential in Jiyuan area are optimistic regions for hydrocarbon accumulation.This study will provide a new idea and a fresh approach to explore and search for hidden oil pools at a delta depositional system in depression basins.
引文
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8刘豪,王英民.准噶尔盆地坳陷湖盆坡折带在非构造圈闭勘探中的应用[J].石油与天然气地质,2004,25(4):422-427[Liu Hao,Wang Yingmin.Significance of slope break zone in depression lake ba-sin to exploration of non-structural traps in Junggar basin[J].Oil and Gas Geology,2004,25(4):422-427]
9朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层岩石探讨[J].沉积学报,2003,31(2):283-287[Zhu Xiaoming,Kang An,Wang Guiwen.Discussion on sequence rocks in continental de-pression and rift subsidence lake basins[J].Acta Sedimentologica Sinica,2003,31(2):283-287]
10胡宗全,李明娟.准噶尔盆地西北缘侏罗系层序模拟与沉积相演化特征[J].石油与天然气地质,2003,24(4):351-361[Hu Zongquan,Li Mingjuan.Sequence modeling and sedimentary facies e-volution of Jurassic in northwestern edge of Junggar basin[J].Oil and Gas Geology,2003,24(4):351-361]
11Luo Jinglan,Li Jian,Yang Binghu,et al.Provenance for the Chang6and Chang8Member of the Yanchang Formation in Xifeng area and in the periphery Ordos basin:evidence from petrologic geochemistry[J].Sciences in China:Series D,2007,50(Supp.II):75-90
12武福礼,李文厚,李玉宏,等.鄂尔多斯盆地上三叠统延长组三角洲沉积及演化[J].古地理学报,2004,6(3):307-315[Wu Fu-li,Li Wenhou,Li Yuhong,et al.Deltaic sedimentation and evolution of the Yanchang Formation,Upper Triassic in Ordos Basin[J].Jour-nal of Palaeogeography,2004,6(3):307-315]
13Luo Jinglan,Morad S,Zhang Xiaoli,et al.Reconstruction of the dia-genesis of the fluvial-lacustrine-deltaic sandstones and its influence on the reservoir-quality evolution[J].Science in China:Series D,2002,45(7):616-634
14张文正,李剑峰.鄂尔多斯盆地油气源研究[J].中国石油勘探,2001,6(4):28-36[Zhang Wenzhen,Li Jianfeng.Research on re-sources of hydrocarbon in the Ordos basin[J].Journal of China Pe-troleum Exploitation,2001,6(43):28-36]
15张文正,裴戈,关德师.鄂尔多斯盆地中、古生界原油单体系列碳同位素研究[J].科学通报,1992,37(3):248-251[Zhang Wenzhen,Pei Ge,Guan Deshi.Study on the mono-series carbon iso-tope in hydrocarbons of the Mesozoic and Paleozoic in the Ordos basin[J].Chinese Science Bulletin,1992,37(3):248-251]
2Vail P R.Seismic stratigraphy interpretation using sequence stratigra-phy.Part1:Seismeic stratigraphy interpretation procedure[C]∥Bally A W,ed.Atlas of Seismic Stratigraphy.AAPG Bulletin,Studies in Geology,1987,27(1):1-10
3张善文,王英明,李群.应用坡折带理论寻找隐蔽油气藏[C]∥胜利油区勘探开发论文集.北京:地质出版社,1999:34-39[Zhang Shanwen,Wang Yingming,Li Qun.Search for hidden hydrocarbon pools using slope break theory[C]∥Symposium of Exploitation and Development on Oil Regain of Shengli Oil Field.Beijing:Geological Publishing House,1999:34-39]
4林畅松,潘元林,肖建新,等.“构造坡折带”—断陷盆地层序分析和油气预测的重要概念[J].地球科学—中国地质大学学报,2000,25(3):260-266[Lin Changsong,Pan Yuanlin,Xiao Jianxin,et al.Structural slope break zone:key concept for stratigraphic se-quence analysis and petroleum forecasting for subsidence basins[J].Earth Sciences:Journal of China University of Geosceinces,2000,25(3):260-266]
5王英民,金武弟,刘书会,等.断陷湖盆多级坡折带的成因类型、展布及其勘探意义[J].石油与天然气地质,2003,24(3):199-204[Wang Yingming,Jin Wudi,Liu Shuhui,et al.Genetic types,distribution and exploration significance of multistage slope breaks in rift lacustrine basins[J].Oil and Gas Geology,2003,24(3):199-204]
6王永诗,姜素华,秦永霞.斜坡带油气成藏特征与勘探方法—以济阳坳陷为例[C]∥胜利油区勘探开发论文集.北京:地质出版社,1999:40-45[Wang Yongshi,Jiang Suhua,Qing Yongxia.Char-acteristics of oil-pool forming on slope breaks and exploitation methods[C]∥Symposium of Exploitation and Development on Oil Region of Shengli Oil Field.Beijing:Geological Publishing House,1999:40-45]
7冯有良,周海民,李思田,等.陆相断陷盆地层序类型与构造特征[J].地质评论,2004,50(1):43-49[Feng Youliang,ZhouHaimin,Li Sitian,et al.Sequence types and structural characteristics in continental rift-subsidence basins[J].Geological Review,2004,50(1):43-49]
8刘豪,王英民.准噶尔盆地坳陷湖盆坡折带在非构造圈闭勘探中的应用[J].石油与天然气地质,2004,25(4):422-427[Liu Hao,Wang Yingmin.Significance of slope break zone in depression lake ba-sin to exploration of non-structural traps in Junggar basin[J].Oil and Gas Geology,2004,25(4):422-427]
9朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层岩石探讨[J].沉积学报,2003,31(2):283-287[Zhu Xiaoming,Kang An,Wang Guiwen.Discussion on sequence rocks in continental de-pression and rift subsidence lake basins[J].Acta Sedimentologica Sinica,2003,31(2):283-287]
10胡宗全,李明娟.准噶尔盆地西北缘侏罗系层序模拟与沉积相演化特征[J].石油与天然气地质,2003,24(4):351-361[Hu Zongquan,Li Mingjuan.Sequence modeling and sedimentary facies e-volution of Jurassic in northwestern edge of Junggar basin[J].Oil and Gas Geology,2003,24(4):351-361]
11Luo Jinglan,Li Jian,Yang Binghu,et al.Provenance for the Chang6and Chang8Member of the Yanchang Formation in Xifeng area and in the periphery Ordos basin:evidence from petrologic geochemistry[J].Sciences in China:Series D,2007,50(Supp.II):75-90
12武福礼,李文厚,李玉宏,等.鄂尔多斯盆地上三叠统延长组三角洲沉积及演化[J].古地理学报,2004,6(3):307-315[Wu Fu-li,Li Wenhou,Li Yuhong,et al.Deltaic sedimentation and evolution of the Yanchang Formation,Upper Triassic in Ordos Basin[J].Jour-nal of Palaeogeography,2004,6(3):307-315]
13Luo Jinglan,Morad S,Zhang Xiaoli,et al.Reconstruction of the dia-genesis of the fluvial-lacustrine-deltaic sandstones and its influence on the reservoir-quality evolution[J].Science in China:Series D,2002,45(7):616-634
14张文正,李剑峰.鄂尔多斯盆地油气源研究[J].中国石油勘探,2001,6(4):28-36[Zhang Wenzhen,Li Jianfeng.Research on re-sources of hydrocarbon in the Ordos basin[J].Journal of China Pe-troleum Exploitation,2001,6(43):28-36]
15张文正,裴戈,关德师.鄂尔多斯盆地中、古生界原油单体系列碳同位素研究[J].科学通报,1992,37(3):248-251[Zhang Wenzhen,Pei Ge,Guan Deshi.Study on the mono-series carbon iso-tope in hydrocarbons of the Mesozoic and Paleozoic in the Ordos basin[J].Chinese Science Bulletin,1992,37(3):248-251]
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