四川盆地埋藏沉降史模拟
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摘要
将地震剖面与钻井资料结合起来 ,根据钻井取得的地层厚度、时代、岩性、密度、孔隙度等信息 ,对剖面上任意点进行回剥分析 ,并运用均衡原理绘出沉降曲线 ,从而给出沉积史和构造史 .模拟研究四川盆地埋藏沉降史表明 ,四川盆地构造沉降与总沉降之差随地层地质年龄的减少而减少 ,说明地层越新压实量越小 .不同时期的沉降速率有所不同 ,总趋势为早期沉降速率大 ,随着时间的推移 ,沉降速率逐渐减小 .
Based on the stratigraphic thickness, ages, lithosphere, porosity and seismic sections, the sedimentary and subsidence history can be obtained from subsidence curves by using backstripping analysis. The study indicates that the difference between the total subsidence and the tectonic subsidence in Sichuan basin decreases with the decreasing geological time, implying the small amount of compaction when the stratum is young. The subsidence rate is different in the various periods. The subsidence rate is large during the old time and become small as the time is running.
Based on the stratigraphic thickness, ages, lithosphere, porosity and seismic sections, the sedimentary and subsidence history can be obtained from subsidence curves by using backstripping analysis. The study indicates that the difference between the total subsidence and the tectonic subsidence in Sichuan basin decreases with the decreasing geological time, implying the small amount of compaction when the stratum is young. The subsidence rate is different in the various periods. The subsidence rate is large during the old time and become small as the time is running.
引文
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[3] 郭正吾,韩永辉.四川盆地碎屑岩油气地质图集.四川:四川科学技术出版社,1996GUOZhengwu,HANYonghui.PetroleumGeologyAtlasofClasticRocksinSichuanBasin.Chengdu:SichuanScienceandTechnologyPress,1996
[4] 常 旭,刘伊克.用波速层析成像方法提高储层横向预测精度.地球物理学报,1996,39(6):813～822CHANGXu,LIUYike.Theimprovementofprecisionofthelateralestimationinthetargetstratausingthevelocitytomographictechnique.ChineseJ.Geophys.(ActaGeophysicaSinica),1996,40(1):127～138
[5] 刘光鼎.中国盆地研究及其评价.石油与天然气地质,1990,10(2):123～129LIUGuangding.BasinsstudyinganditsappraisingofChina.JournalofOilandGasGeology,1990,10(2):123～129
[6] 刘伊克,常 旭.水动力油气二次运移的多重网格方法.地球物理学报,1998,41(3):67～73LIUYike,CHANGXu.Multigridonthesecondmigrationofoildrivedbywater.ChineseJ.Geophys.(ActaGeophysicaSinica),1998,41(3):67～73
[7] 刘伊克,郝天珧.油气盆地综合地球物理处理与动态模拟系统研究.地球物理学报,1997,40(3):347～355LIUYike,HAOTianyao.Thestudyonthebasinmodellingsystemandintegratedgeophysicalprocessing.ChineseJ.Geophys.(ActaGeophysicaSinica),1997,40(3):347～355
[8] TissotBP ,WelteDH .PetroleumFormationandOccurrence.NewYork:SpringerVerlag,1978.538～550
[9] AllenPA ,AllenJR .BasinAnalysisPrinciplesandApplications.London:Balckwellscientificpublications
[10] BruntMF,PichonX .Subsidenceoftheparisbasin.J.Geophys.Res.1982,87(3):8547～8560
[11] 冯 康.数值计算方法.北京:国防工业出版社,1978FENGKang.NumericalCalculationMethods.Beijing:DefenceIndustryPress,1978
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