随机优化地震反演在砂砾岩储层预测中的应用——以胜利油田盐22块油藏为例
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摘要
盐家油田盐22块砂砾岩体发育在东营凹陷陡坡带,为快速堆积、成层性差、横向变化快的近岸水下扇沉积。因其成因复杂,规律性差,常规波阻抗反演模型化严重,难以揭示储层内幕。而随机优化地震反演不需要繁杂的模型初始化,只需在对原始地震资料提频处理的基础上,在测井资料的声阻抗域进行求解。该方法在盐22块储层反演中成功应用,得到的反演结果更加符合砂砾岩沉积的特点,符合区域地质规律,相对常规反演具有较高的可信度,也为深层砂砾岩油藏的描述和开发积累了经验。
Block Yan 22 sandy conglomerate reservoir of Yanjia Oilfield was developed in the steep slope zone of Dongying Depression. The sediment was accumulated in a short time span and was poor in layering. It was a near-shore submerged fan sediment with fast change in the lateral direction. Because of its complex genesis,poor regularity,it was difficult to use conventional impedance inversion to reveal the internal structure of the reservoir. Complicated initial model was not needed by using stochastic optimization approach for seismic inversion. The problem was solved in the acoustic impedance domain of logging data by using the spectral enhanced seismic data. This method is successfully applied for reservoir inverting in Block Yan 22. The inversion results are consistent with the characteristics of sandy conglomerate sediments,and are more reliable than those from conventional inversion.
Block Yan 22 sandy conglomerate reservoir of Yanjia Oilfield was developed in the steep slope zone of Dongying Depression. The sediment was accumulated in a short time span and was poor in layering. It was a near-shore submerged fan sediment with fast change in the lateral direction. Because of its complex genesis,poor regularity,it was difficult to use conventional impedance inversion to reveal the internal structure of the reservoir. Complicated initial model was not needed by using stochastic optimization approach for seismic inversion. The problem was solved in the acoustic impedance domain of logging data by using the spectral enhanced seismic data. This method is successfully applied for reservoir inverting in Block Yan 22. The inversion results are consistent with the characteristics of sandy conglomerate sediments,and are more reliable than those from conventional inversion.
引文
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[2]付瑾平,刘玉浩,王宝言.箕状凹陷陡坡带沙砾岩扇体空间展布及成藏规律[J].复式油气田,1998,(3):8~11.
[3]夏景生.丰深1地区沙四段砂砾岩体的储层特征及影响因素[J].石油天然气学报,2007,29(3):42~45.
[4]马丽娟.东营凹陷北部砂砾岩储层描述方法[J].石油物探,2002,41(3):354~358.
[5]Huang Xuri,Kelkar M.Seismic inversion using combinatorial algorithm——a hybrid scheme[J].Proceedings of66th International SEG Annual Conference,1996.
[6]彭传圣,王永诗,常国贞,等.罗家地区砂砾岩储集层地球物理预测技术[J].油气地质与采收率,2001,8(2):62~67.
[7]孙海宁,王洪宝,欧浩文,等.砂砾岩储层地震预测技术[J].天然气工业,2007,27(增刊A):397~398.
[8]Hongliu Zeng,Stephen C Henry,John P Riola.Stratal slicing,partⅡ:Real3-Dseismic data[J].Geophysics,1998,63(2):514~522.
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