时深效应指数影响因素分析
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摘要
时深效应指数TDI的计算受到多种因素影响,这些因素在一定程度上会制约实际应用效果。结合实际资料,分别针对TDI计算过程中的去压实恢复、压实系数与地表孔隙度的求取、超压和地层剥蚀恢复等因素,进行了不同计算条件下埋藏史演化曲线和TDI值的分析比较。结果表明:如果考虑压实作用的影响,将会使TDI值增大;如果考虑地层剥蚀的影响,将会使剥蚀前地层的TDI值增大;存在超压时地层的有效埋深比实际埋深小,因而考虑超压因素计算的TDI值将会有所减小,且其计算精度受反演的地震速度场的精度以及井点压力与速度间关系的可靠性的影响。
There are many influencing factors for calculation of time-depth index.These factors may restrict its application to some extent.In this paper,burial history evolution curve and TDI value have been calculated and compared with actual data considering such influencing factors as decompaction correction,compaction coefficient and initial surface porosity,recovering denudation and overpressure.It can be concluded that the TDI value will be increased while considering decompaction correction.The TDI value of sedimentary layers before the denudation stage will increase while considering recovering denudation.The effective buried depth is smaller than the actual depth in the overpressure environment,and the TDI value will decrease while considering overpressure.The accuracy of the results is affected by the inverted velocity field and the reliability of the relationship between the pressure at well position and velocity.
There are many influencing factors for calculation of time-depth index.These factors may restrict its application to some extent.In this paper,burial history evolution curve and TDI value have been calculated and compared with actual data considering such influencing factors as decompaction correction,compaction coefficient and initial surface porosity,recovering denudation and overpressure.It can be concluded that the TDI value will be increased while considering decompaction correction.The TDI value of sedimentary layers before the denudation stage will increase while considering recovering denudation.The effective buried depth is smaller than the actual depth in the overpressure environment,and the TDI value will decrease while considering overpressure.The accuracy of the results is affected by the inverted velocity field and the reliability of the relationship between the pressure at well position and velocity.
引文
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[6]肖丽华,孟元林,侯创业,等.松辽盆地升平地区深层成岩作用数值模拟与次生孔隙带预测[J].地质论评,2003,49(5):544-551.
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[2]王粤川,孟元林,贺茹,等.用时深效应指数预测储层孔隙度——以辽河坳陷西部凹陷南段沙三中亚段为例[J].中国海上油气,2006,18(5):308-312.
[3]GLUYAS J,CADE C A.Prediction of porsity in compactedsands[G].JULIE A,KUPECZ,JON G,et al.Reservoir qualityprediction in sandstones and carbonates.American Associationof Petroleum Geologists(AAPG)Memoir 69,Tulsal:AmericanAssociation of Petroleum Geologists.1997,26:19-27.
[4]BLOCH S.Empirical prediction of porosity and permeability insandstones[J].AAPG Bull,1991,75(7):1145-1160.
[5]孟元林,刘德来,贺如,等.歧北凹陷沙二段超压背景下的成岩场分析与储层孔隙度预测[J].沉积学报,2005,23(3):389-395.
[6]肖丽华,孟元林,侯创业,等.松辽盆地升平地区深层成岩作用数值模拟与次生孔隙带预测[J].地质论评,2003,49(5):544-551.
[7]李向东.准噶尔盆地北缘中新生代沉降史分析[D].西安:西北大学,2007.
[8]庞雄奇,付广,陈章明,等.地震数据用于地层古厚度恢复与剥蚀量计算方法探讨[J].大庆石油学院学报,1991,15(4):1-8.
[9]边凤青.东营凹陷沙四段孔店组剥蚀厚度与原型盆地的恢复[D].青岛:中国海洋大学,2009.
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