鄂尔多斯盆地西北部礁滩相储层地震识别与勘探效果
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摘要
鄂尔多斯盆地西北部下古生界属祁连海域沉积区,从区域地质上推断存在台地边缘相,早期的钻探证实克里摩里组的碳酸盐岩储层可能存在礁滩相沉积,但目前对于该区礁滩相的地震特征、分布规模缺乏足够的认识。根据已知井礁滩相的地震特征和外探区的勘探经验,总结出了该区礁滩相的地震特征主要为较强振幅的丘形反射,应用地震相分析、地震属性分析、地震反演等多种技术预测了该区礁滩相的平面分布。在此基础上提供的风险探井——棋探1井,在克里摩里组钻遇礁滩相的生物碎屑灰岩、藻黏结灰岩和亮晶砂屑灰岩,并见含气显示。
The Lower Paleozoic in northwestern Ordos Basin belongs to Qilian marine sedimentary province, in which Carbonate platform margin is inferred to be present from regional geology. Previous drilling confirms that there may be reef-bank facies in carbonate reservoir in Kelimoli Formation. However, the seismic attributes and distribution scale of the reef-bank facies in this area are not fully recognized. Based on known seismic attributes of reef-bank facies and experience of external exploration area, it is summarize that the seismic attribute of reef-bank facies is mainly hummocky reflection with relative strong attributes. Several technologies such as seismic facies analysis, seismic attribute analysis and seismic inversion are applied to predict the distribution of reef-bank facies in the study area. The actual data shows that in Qitan 1 well there are bioclastic limestone, algal limestone and sandy sparite limestone in Kelimoli Formation, and there are indications of gas-bearing property.
The Lower Paleozoic in northwestern Ordos Basin belongs to Qilian marine sedimentary province, in which Carbonate platform margin is inferred to be present from regional geology. Previous drilling confirms that there may be reef-bank facies in carbonate reservoir in Kelimoli Formation. However, the seismic attributes and distribution scale of the reef-bank facies in this area are not fully recognized. Based on known seismic attributes of reef-bank facies and experience of external exploration area, it is summarize that the seismic attribute of reef-bank facies is mainly hummocky reflection with relative strong attributes. Several technologies such as seismic facies analysis, seismic attribute analysis and seismic inversion are applied to predict the distribution of reef-bank facies in the study area. The actual data shows that in Qitan 1 well there are bioclastic limestone, algal limestone and sandy sparite limestone in Kelimoli Formation, and there are indications of gas-bearing property.
引文
[1]郭峰.贺兰拗拉谷寒武—奥陶系层序地层及海相烃源岩研究[D].北京:中国地质大学,2007.
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[9]蔡涵鹏,贺振华,黄德济.频率信息在碳酸盐岩礁滩储层含油气性预测中的应用[J].岩性油气藏,2008,20(4):113-117.
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[2]杨文敬.鄂尔多斯西缘奥陶纪沉积演化及其控制下的油气地质条件[D].西安:西北大学,2006.
[3]胡国艺.鄂尔多斯盆地奥陶系天然气成藏机理及其与构造演化关系[D].广州:中国科学院研究生院(广州地球化学研究所),2003.
[4]杨华,张军,王飞雁.鄂尔多斯盆地古生界含气系统特征[J].天然气工业,2000,20(6):7-11.
[5]郑聪斌,冀小林,贾疏源.陕甘宁盆地中部奥陶系风化壳古岩溶发育特征[J].中国岩溶,1995,14(3):280-288.
[6]Payton C E.地震地层学[M].牛毓荃,译.北京:石油工业出版社,1980:97-106.
[7]段玉顺,李芳.地震相的自动识别方法及应用[J].地球物理勘探,2004,39(2):158-162.
[8]肖盈,贺振华,黄德济.碳酸盐岩礁滩相储层地震波场数值模拟[J].岩性油气藏,2009,21(1):99-101.
[9]蔡涵鹏,贺振华,黄德济.频率信息在碳酸盐岩礁滩储层含油气性预测中的应用[J].岩性油气藏,2008,20(4):113-117.
[10]刘伟方,段永华,高建虎,等.利用地震属性预测碳酸盐岩储层[J].岩性油气藏,2007,19(1):101-104.
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