多地震属性联合反演在地层压力预测中的应用
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摘要
库车坳陷异常压力发育,但成因机制复杂,膏泥岩段中的超压主要以欠压实为主,白垩系地层中的超压以构造成因为主。传统的速度资料对钻井揭示的超压几乎没有明显响应,仅应用波阻抗反演不能对该区超压带的横向分布范围进行准确描述。为此,依据前人的实验研究结果,对库车坳陷超压分布范围的预测方法进行了探讨。对库车坳陷的超压和速度特征进行了分析,并论述了基于地震属性进行超压预测的依据；在此基础上,利用井约束反演的波阻抗与瞬时频率联合对库车坳陷阳霞凹陷内的超压带进行了预测。利用该联合预测方法在阳霞凹陷库1井井区不仅预测出3个超压带,而且在纵向上和横向上非常清晰地描述了这3个超压带的分布特征。预测结果与库1井的DST(钻杆测试)压力测试结果十分吻合。
Abnormal pressure is well developed in Kuche depression,but its forming mechanism is complex.The overpressure in cream- mudstone interval is mainly the undercompacted origin while the o- verpressure in Cretaceous is mainly the tectonic origin.The tradi- tional velocity data has no any obvious response to the overpressure revealed by drilling and the acoustic impedance cannot accurately describe the lateral distribution scale of overpressure zone in this area.Therefore,on the basis of former experimental results,the prediction methods for overpressure distribution features in Kuche depression are researched,the overpressure and velocity features in Kuche depression analyzed,and the criteria of overpressure predic- tion based on seismic properties discussed.On the basis of this,the well restrained inverse acoustic impedance and instantaneous fre quency are jointly used to predict the overpressure of Yangxia sag, Kuche depression.By using this joint prediction method,three o- verpressure zones are predicted in Kul well field of Yangxia sag with the patterns of these overpressure zones being clearly de- scribed both vertically and horizontally.The prediction results are in good accordance with the DST pressure test results of well Kul.
Abnormal pressure is well developed in Kuche depression,but its forming mechanism is complex.The overpressure in cream- mudstone interval is mainly the undercompacted origin while the o- verpressure in Cretaceous is mainly the tectonic origin.The tradi- tional velocity data has no any obvious response to the overpressure revealed by drilling and the acoustic impedance cannot accurately describe the lateral distribution scale of overpressure zone in this area.Therefore,on the basis of former experimental results,the prediction methods for overpressure distribution features in Kuche depression are researched,the overpressure and velocity features in Kuche depression analyzed,and the criteria of overpressure predic- tion based on seismic properties discussed.On the basis of this,the well restrained inverse acoustic impedance and instantaneous fre quency are jointly used to predict the overpressure of Yangxia sag, Kuche depression.By using this joint prediction method,three o- verpressure zones are predicted in Kul well field of Yangxia sag with the patterns of these overpressure zones being clearly de- scribed both vertically and horizontally.The prediction results are in good accordance with the DST pressure test results of well Kul.
引文
1赵靖舟．前陆盆地天然气成藏理论及应用[M]．北京：石油工业出版社，2003．1～20
2石万忠，陈红汉，张希明等．阳霞凹陷超压成因及与油气成藏关系探讨[J]．地球科学——中国地质大学学报，2005，30(2)：221～227
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5 Dutta N C.Geopressure prediction using seismic data:Current status and the road ahead[J].Geophysics,2002,67(6):2012～2041
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10欧阳健．测井地应力分析——以库车坳陷克拉2井气藏解释为例[J]．新疆石油地质，1999，20(3)：213～217
11 Osborne M J,Swarbrick R E.Mechanisms for generaring overpressure in sedimentary basins:A reevaluation[J].Bulletin of American Association of Petroleum Geologists,1997,81(6):1023～1041
12王振峰，罗晓容．莺琼盆地高温高压地层钻井压力预监测技术研究[M]．北京：石油工业出版社，2004．10～16
13 Prasad M,Meissner R.Attenuation mechanisms in sands:Laboratory versus theoretical(Biot)data[J].Geophysics,1992,57(5):710～719
14 Prasad M.Acoustic measurements in unconsolidated sands at low effective pressure and overpressure detection[J].Geophysics,2002,67(2):405～412
15 Ciz R,Urosevic M,Dodds K.Pore pressure prediction based on seismic attributes response to overpressure[J].Journal of Australian Petroleum and Exploration Association,2005,43(3):1～9
2石万忠，陈红汉，张希明等．阳霞凹陷超压成因及与油气成藏关系探讨[J]．地球科学——中国地质大学学报，2005，30(2)：221～227
3 Shi W Z,Chen H H,Zhang X M,et al.Prediction of overpressure contributed mainly by structural compression using impedance inversion in Kuqa depression,Tarim basin[J].Journal of China University of Geoscience,2004,15(3):341～348
4奇林格，谢列部里亚科夫，罗伯逊．异常地层压力成因与预测[M]．赵文智，柳广第，苗继军译．北京：石油工业出版社，2004．1～20
5 Dutta N C.Geopressure prediction using seismic data:Current status and the road ahead[J].Geophysics,2002,67(6):2012～2041
6宋岩，方世虎，赵孟军等．前陆盆地冲断带构造分段特征及其对油气成藏的控制作用[J]．地学前缘，2005，12(3)：31～38
7宋岩，赵孟军，柳少波等．中国前陆盆地油气富集规律[J]．地质论评，2006，52(1)：85～92
8贾承造，宋岩，魏国齐等．中国中西部前陆盆地的地质特征及油气聚集[J]．地学前缘，2005，12(3)：3～13
9李军，王贵文，欧阳健．利用测井信息定量研究库车坳陷山前地区地应力[J]．石油勘探与开发，2001，28(5)：93～95
10欧阳健．测井地应力分析——以库车坳陷克拉2井气藏解释为例[J]．新疆石油地质，1999，20(3)：213～217
11 Osborne M J,Swarbrick R E.Mechanisms for generaring overpressure in sedimentary basins:A reevaluation[J].Bulletin of American Association of Petroleum Geologists,1997,81(6):1023～1041
12王振峰，罗晓容．莺琼盆地高温高压地层钻井压力预监测技术研究[M]．北京：石油工业出版社，2004．10～16
13 Prasad M,Meissner R.Attenuation mechanisms in sands:Laboratory versus theoretical(Biot)data[J].Geophysics,1992,57(5):710～719
14 Prasad M.Acoustic measurements in unconsolidated sands at low effective pressure and overpressure detection[J].Geophysics,2002,67(2):405～412
15 Ciz R,Urosevic M,Dodds K.Pore pressure prediction based on seismic attributes response to overpressure[J].Journal of Australian Petroleum and Exploration Association,2005,43(3):1～9
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