东濮断陷湖盆兰聊陡坡带扇体形成机制及成藏规律研究
摘要
陆相断陷湖盆陡坡带由于具有特殊的构造背景,在下降盘易发育各种类型的砂砾岩扇体,且具有很好的含油气前景,近几年各大油田也都将其作为增储上产的重要勘探领域.但由于这些扇体一般都具有较大的隐蔽性,而且控制影响因素复杂,尤其是对于为数较多的受高角度大断层控制的断陷湖盆,在陡坡带进行砂砾岩扇体的勘探具有更大的风险性.本文运用层序地层学、地震精细描述等勘探新理论、新技术和新方法,结合生产实际,对东濮凹陷高角度兰聊陡坡带砂砾岩扇体形成机制及成藏规律进行了多学科综合研究,查明了扇体的成因机制、控制因素、分布规律,并进一步探讨了扇体成藏机理和成藏规律,为下一步勘探指明了有利方向和钻探目标,期望为国内外同类盆地陡坡带油气资源的勘探也提供了一定的借鉴.
Because of the peculiar structure characteristics of the steep slope zone of continental fault\|trough lake basin, there are many more styles sand\|conglomerate fans bearing hydrocarbon at the downthrow. More and more petroleum corporations found large\|scale reserves in these fans. But the exploration to fan reserves will run a larger risk, especially in a fault\|trough lake basin controlled by high\|angle fault. The sand\|conglomerate fans belongs to subtle traps and controlled or influenced by many more factors. After integrated research on the Lanliao steep slope zone of Dongpu depression using sequence stratigraphy and seismic interpretation, the author analyzed the forming mechanism, controlled factors and distribution rules of the sand\|conglomerate fans. The paper indicates that there are 6 kinds of fault structure models of Lanliao fault, and so formed 6 slope-break styles. Combined the result of sequence stratigraphy analysis, the author found alluvial fans, fan deltas, near\|bank subaqueous fans, deepwater turbidity fans and slump turbidity fans in Lanliao steep slope zone, and the last 3 kinds of these fans which formed in 3 section of Shahejie formation have the best condition of bearing hydrocarbon. The paper also indicates that Maogang and Baimiao areas are the main exploration aims and have already found many oil and gas. These areas will be the important exploration hotspots in the future. The results of this research will also provide a useful reference to the other basins in home or overseas.
Because of the peculiar structure characteristics of the steep slope zone of continental fault\|trough lake basin, there are many more styles sand\|conglomerate fans bearing hydrocarbon at the downthrow. More and more petroleum corporations found large\|scale reserves in these fans. But the exploration to fan reserves will run a larger risk, especially in a fault\|trough lake basin controlled by high\|angle fault. The sand\|conglomerate fans belongs to subtle traps and controlled or influenced by many more factors. After integrated research on the Lanliao steep slope zone of Dongpu depression using sequence stratigraphy and seismic interpretation, the author analyzed the forming mechanism, controlled factors and distribution rules of the sand\|conglomerate fans. The paper indicates that there are 6 kinds of fault structure models of Lanliao fault, and so formed 6 slope-break styles. Combined the result of sequence stratigraphy analysis, the author found alluvial fans, fan deltas, near\|bank subaqueous fans, deepwater turbidity fans and slump turbidity fans in Lanliao steep slope zone, and the last 3 kinds of these fans which formed in 3 section of Shahejie formation have the best condition of bearing hydrocarbon. The paper also indicates that Maogang and Baimiao areas are the main exploration aims and have already found many oil and gas. These areas will be the important exploration hotspots in the future. The results of this research will also provide a useful reference to the other basins in home or overseas.
引文
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[13] 付瑾平,刘玉浩等,箕状凹陷陡坡带砂砾岩扇体空间展布及成藏规律—以东营凹陷为例[J].复式油气田,1998,3:8～11.
[14] 姜素华,林红梅,王永诗.陡坡带砂砾岩扇体油气成藏特征--以济阳坳陷为例[J].石油物探,2003,42(3):313～317.
[2] 刘光鼎,郝天珧,祝靓谊.环渤海地区油气资源探查的思考[J].地球物理学进展,2002,17(4):559～563.
[3] 刘光鼎.前新生代海相残留盆地[J].地球物理学进展,2001,16(2):1～7.
[4] 刘光鼎,祝靓谊.近期油气勘探地球物理的一些新进展[J].地球物理学进展,2003,18(3):363～367.
[5] 祝靓谊.油气勘探综合地球物理研究方法综述[J],地球物理学进展,2003,18(1):19～23.
[6] 刘秋生,李火车等.兰聊断裂带"横向三分"结构及其意义[J].石油地球物理勘探,1998(增刊):89～99.
[7] 陈振中,李治等,毛岗地区兰聊断层新认识[J].断块油气田,1998,4:16～19.
[8] 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),199～203.
[9] 李思田,潘元林,陆永潮等,断陷湖盆隐蔽油藏预测及勘探的关键技术--高精度地震探测基础上的层序地层学研究[J].地球科学-中国地质大学学报,2002,27(5):592～598
[10] 刘传虎,砂砾岩扇体发育特征及地震描述技术[J].石油物探,2001,40(1):64～72.
[11] 刘书会,宋国奇,赵铭海,复杂砂岩储集体地震地质综合解释技术[J].石油物探,2003,(42)3:302～305.
[12] 孔凡仙,东营凹陷北部陡坡带砂砾岩体的勘探[J].石油地球物理勘探,2000,35(5):669～676.
[13] 付瑾平,刘玉浩等,箕状凹陷陡坡带砂砾岩扇体空间展布及成藏规律—以东营凹陷为例[J].复式油气田,1998,3:8～11.
[14] 姜素华,林红梅,王永诗.陡坡带砂砾岩扇体油气成藏特征--以济阳坳陷为例[J].石油物探,2003,42(3):313～317.
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