文昌A凹陷某气藏地震非弹性效应与含气性预测
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摘要
在对文昌A凹陷内隐蔽油气藏勘探的尝试中,钻井成功率并不高,主要原因在于灰质含量较高的珠二段1砂组影响了下伏2砂组地球物理特性的表征。面对这种岩性组合,AVO方法缺乏相应的地球物理特征响应,而地震非弹性效应预测技术利用在油气藏范围内地震吸收衰减率上升段与速度弥散性异常共存的现象却能获得很好的含气异常响应。钻井结果和中途测试结果证实,地震非弹性效应预测结果完全符合地下储层含气性实际情况。
In the trial exploration of subtle reservoir in A sag of Wen-chang area, the success ratio of drilling is not ideal. The main reason is that the first sand set of Zhu2 segment with high carbonate content affects the description of geophysical characteristics in the second sand set. The AVO has few responding geophysical features for this lithological association. However, the seismic non-elastic effect prediction can obtain good gas-bearing unusual response by using the abnormally coexisting phenomenon of ascending passage of seismic absorption attenuation rate and the dispersion of velocities. The drilling results and drill-stem test results prove that the prediction results of seismic nonelastic effect completely coincide with the actual gas-bearing situation in the reservoir.
In the trial exploration of subtle reservoir in A sag of Wen-chang area, the success ratio of drilling is not ideal. The main reason is that the first sand set of Zhu2 segment with high carbonate content affects the description of geophysical characteristics in the second sand set. The AVO has few responding geophysical features for this lithological association. However, the seismic non-elastic effect prediction can obtain good gas-bearing unusual response by using the abnormally coexisting phenomenon of ascending passage of seismic absorption attenuation rate and the dispersion of velocities. The drilling results and drill-stem test results prove that the prediction results of seismic nonelastic effect completely coincide with the actual gas-bearing situation in the reservoir.
引文
1黄中玉,王于静,苏永昌．一种新的地震波衰减分析方法——预测油气异常的有效工具[J]．石油地球物理勘探,2000,35(6):768～773
2李宏兵,赵文智,曹宏等．应用小波尺度域地震波衰减属性检测气层[J]．石油地球物理勘探,2005,40(4): 411～416
3苑书金,董宁,于常青．地震波衰减技术在鄂尔多斯盆地储层预测中的应用[J]．石油物探,2006,45(2): 182～185
4 Rapoport M B, Ryjkov V I. Seismic velocity dispersion: An indicator of hydrocarbons[J]. Expanded Abstracts of 64th Annual Intemat SEG Mtg,1994, 94~96
5 Ryjkov V I, Rapoport M B. Study of a seismic inelasticity from VSP[J]. Extended abstracts of 56th EAEG Meeting, 1994,13
6 Rapoport M B, Rapoport L I, Ryjkov V I, et al. Interpretation of seismic inelasticity effects in oil and gas prospecting[J]. Expanded Abstracts of 65th Annual Intemat SEG Mtg, 1995, 683-685
7 Rapoport M B, Ryjkov V I, Rapoport L I, et al. The oil prospecting using attributes of reservoir properties and fluid saturation [J]. Expanded Abstracts of 67th Annual Internat SEG Mtg, 1997,606-608
8 Rapoport M B, Rapoport I. I, Ryjkov V I. Direct detection of oil and gas fields based on seismic inelasticity effect[J]. The Leading Edge,2004,23(3):276-278
9黄凯,徐群洲,杨晓海．地震波能量的衰减及其影响因素[J]．新疆石油地质,1997,18(3):212～216
10席道瑛,刘斌,程经毅．干燥和饱和岩石的衰减与频散特性[J]．物探化探计算技术,1997,19(1):19～22
11 Sams M S. Attenuation and anisotropy: The effect of extra fine layering [J]. Geophysics, 1995, 60(6): 1 646-1655
12 Neep J P. Sams M S, Worthington M H,et al. Measurement of seismic attenuation from high-resolution crosshole data[J]. Geophysics, 1996, 61 (4) : 1 175 -1 188
13 Sams M S, Neep J P, Worthington M H, et al. The measurement of velocity dispersion and frequency-dependent intrinsic attenuation in sedimentary rocks[J]. Geophysics, 1997, 62(5) :1 456-1 464
14 Chapman M, Enru L, Xiang-Yang L. The influence of abnormally high reservoir attenuation on the AVO signature [ J ]. The Leading Edge, 2005, 24 (11): 1 120-1 125
15 Odebeatu E, Jinghua Z. Chapman M,et al. Application of spectral decomposition to detection of dispersion anomalies associated with gas saturation[J]. The Leading Edge,2006,25(2) :206-210
2李宏兵,赵文智,曹宏等．应用小波尺度域地震波衰减属性检测气层[J]．石油地球物理勘探,2005,40(4): 411～416
3苑书金,董宁,于常青．地震波衰减技术在鄂尔多斯盆地储层预测中的应用[J]．石油物探,2006,45(2): 182～185
4 Rapoport M B, Ryjkov V I. Seismic velocity dispersion: An indicator of hydrocarbons[J]. Expanded Abstracts of 64th Annual Intemat SEG Mtg,1994, 94~96
5 Ryjkov V I, Rapoport M B. Study of a seismic inelasticity from VSP[J]. Extended abstracts of 56th EAEG Meeting, 1994,13
6 Rapoport M B, Rapoport L I, Ryjkov V I, et al. Interpretation of seismic inelasticity effects in oil and gas prospecting[J]. Expanded Abstracts of 65th Annual Intemat SEG Mtg, 1995, 683-685
7 Rapoport M B, Ryjkov V I, Rapoport L I, et al. The oil prospecting using attributes of reservoir properties and fluid saturation [J]. Expanded Abstracts of 67th Annual Internat SEG Mtg, 1997,606-608
8 Rapoport M B, Rapoport I. I, Ryjkov V I. Direct detection of oil and gas fields based on seismic inelasticity effect[J]. The Leading Edge,2004,23(3):276-278
9黄凯,徐群洲,杨晓海．地震波能量的衰减及其影响因素[J]．新疆石油地质,1997,18(3):212～216
10席道瑛,刘斌,程经毅．干燥和饱和岩石的衰减与频散特性[J]．物探化探计算技术,1997,19(1):19～22
11 Sams M S. Attenuation and anisotropy: The effect of extra fine layering [J]. Geophysics, 1995, 60(6): 1 646-1655
12 Neep J P. Sams M S, Worthington M H,et al. Measurement of seismic attenuation from high-resolution crosshole data[J]. Geophysics, 1996, 61 (4) : 1 175 -1 188
13 Sams M S, Neep J P, Worthington M H, et al. The measurement of velocity dispersion and frequency-dependent intrinsic attenuation in sedimentary rocks[J]. Geophysics, 1997, 62(5) :1 456-1 464
14 Chapman M, Enru L, Xiang-Yang L. The influence of abnormally high reservoir attenuation on the AVO signature [ J ]. The Leading Edge, 2005, 24 (11): 1 120-1 125
15 Odebeatu E, Jinghua Z. Chapman M,et al. Application of spectral decomposition to detection of dispersion anomalies associated with gas saturation[J]. The Leading Edge,2006,25(2) :206-210
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