靖边气田统5井区马家沟组储层小幅度构造研究
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摘要
应用地震解释成果和钻井资料,研究了统5井区的微构造分布特征和不同构造部位储层物性和流体分布特征,明确指明有效储层发育的构造部位和天然气富集的有利构造部位。认为统5井区马五1～4亚段的圈闭类型是地层-古沟槽-鼻状构造复合圈闭。这类复合圈闭的储集层、盖层、古沟槽与构造配置合理,它不仅圈闭奥陶系本身油型气,而且最主要是通过古沟槽捕获上覆石炭-二叠系的煤成气。此外,中生代时石炭-二叠系的中含烃酸性流体通过古沟槽,对其附近形成风化壳岩体进行再溶蚀,使孔、洞、缝更发育,储集性能大大提高。
Based on well data and seismic explanation, this paper studies the distribution characters, reservoir property and the fluid distribution of different structures, and points out the favorable structure of effect reservoir and natural gas enrichment. It is showed that the trap style is complex trap of formation-ancient groove-nose-shaped structure. This type of trap has a rational collocation reservoir, cap formation of ancient grooves and structure. It is not only the trap of Ordovician petrolic gas, but also mainly captures the coal-formed gas formed in carbonifierous-dyas formation overlaid on it. Moreover, the carboniferous-dyas acid fluid, through ancient grooves, dissolves the rock of weathering crust nearly, so the pores, holes and sews are more easily developed. And the reservoir capability is greatly raised.
Based on well data and seismic explanation, this paper studies the distribution characters, reservoir property and the fluid distribution of different structures, and points out the favorable structure of effect reservoir and natural gas enrichment. It is showed that the trap style is complex trap of formation-ancient groove-nose-shaped structure. This type of trap has a rational collocation reservoir, cap formation of ancient grooves and structure. It is not only the trap of Ordovician petrolic gas, but also mainly captures the coal-formed gas formed in carbonifierous-dyas formation overlaid on it. Moreover, the carboniferous-dyas acid fluid, through ancient grooves, dissolves the rock of weathering crust nearly, so the pores, holes and sews are more easily developed. And the reservoir capability is greatly raised.
引文
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[2]陈志远,马振芳,张金泉.鄂尔多斯盆地中部奥陶系马五5亚段白云岩成因[J].石油勘探与开发,1993,25(6):20～22.
[3]李兴国.油层微型构造对油井生产的控制作用[J].石油勘探与开发,1987,14(2):53～59.
[4]李兴国.对油层微型构造的补充说明[J].石油勘探与开发,1993,20(1):83～89.
[5]长庆油田石油地质志编写组.中国石油地质志长庆油田[M].北京:石油工业出版社,1987.
[6]李兴国.油层微型构造对油井生产的控制作用[J].油气采收率技术,1994,1(1):68～80.
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