吸收系数在川东南油气预测中的应用
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摘要
地层的吸收系数受控于岩石骨架的弹性性质,同时也受控于地层的孔隙及孔隙中流体的性质,而地层的吸收系数又是反映储集层含油气的重要参数。利用地层的吸收系数变化特征,可以较好地追踪含油气储集层,特别是含气储集层。通过对川东南某区叠后资料的处理,获得该研究区三维吸收系数数据体资料,通过分析发现在含气层部位的吸收系数要强于未含气地层。利用这些解释成果,再结合地质、钻井和测井等资料的综合分析,可以较好地划分出含油气层的分布范围,从而达到油气预测的目的。
The absorption coefficient of strata is controlled by elastic property of rock matrix,also by the properties of porosity and pore fluid.In addition,it is an important parameter reflecting oil-gas bearing property of reservoir rocks.The variation of the absorption coefficient can be used to trace oil-gas bearing reservoir rocks,especially gas pools.This paper presents the processing results of post-stack seismic data in an area of southeastern Sichuan province,obtaining the 3D absorption coefficient database.And the analysis indicates that the coefficient of gas zone is bigger than that of non-gas zone.It is concluded that the comprehensive analysis from these results,combining with geologic,drilling and well logging data,could better delineate the distribution scope of oil-gas bearing zone for the purpose of prediction of oil and gas reservoirs.
The absorption coefficient of strata is controlled by elastic property of rock matrix,also by the properties of porosity and pore fluid.In addition,it is an important parameter reflecting oil-gas bearing property of reservoir rocks.The variation of the absorption coefficient can be used to trace oil-gas bearing reservoir rocks,especially gas pools.This paper presents the processing results of post-stack seismic data in an area of southeastern Sichuan province,obtaining the 3D absorption coefficient database.And the analysis indicates that the coefficient of gas zone is bigger than that of non-gas zone.It is concluded that the comprehensive analysis from these results,combining with geologic,drilling and well logging data,could better delineate the distribution scope of oil-gas bearing zone for the purpose of prediction of oil and gas reservoirs.
引文
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[2]马昭军,刘洋.地震波衰减反演研究综述[J].地球物理学进展,2005,20(4):1 074-1 082.
[3]陈培善.地震波衰减研究在我国的进展[J].地球物理学报,1994,37(1):231-241.
[4]王辉,常旭,刘伊克,等.时间域相邻道地震波衰减成像研究[J].地球物理学报,2001,44(3):396-403.
[5]Best AI,McCann C,Sothcott J.The relationships betweenthe velocities,attenuations,and petrophysical properties ofreservoir sedimentary rocks[J].Geophysical Prospecting,1994,42(1):51-178.
[6]黄花香,邓瑛,吴战培,等.吸收系数反演在川东碳酸盐岩储层预测中的应用[J].石油物探,2003,42(1):86-88.
[7]王卫华.瞬时等效吸收系数反演方法与应用[J].石油地球物理勘探,1992,27(4):431-443.
[8]贝智敏,张纪,叶远生.吸收系数技术在东海储层预测中的应用[J].海洋石油,2000,102(3):1-8.
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