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大民屯凹陷是辽河断陷内 4个下第三系凹陷之一。在综合利用钻井、试井及地震等资料的基础上 ,系统研究并论述了大民屯凹陷流体压力特征。基于 5 7口井的声波测井资料 ,凹陷内泥岩压力特征可区分为正常压力、异常压力或强超压等类型 ;根据 15 2口井 391个点的压力测试数据 ,凹陷内产油层段的压力梯度多接近于 1;利用公式法模拟计算了 4 7条地震剖面的流体压力、剩余压力及压力系数的分布特征 ,凹陷内剖面压力系统自上而下一般由正常压力、弱超压和强超压 3部分组成。此外 ,还根据流体压力演化的基本原理及钻井、岩性与试井等实际资料 ,模拟恢复了大民屯凹陷的压力演化史 ,其可划分为超压原始积累、超压部分释放及超压再积聚 3个阶段。总体上 ,大民屯凹陷的超压强度低于渤海湾盆地其他地区的超压强度
Damintun Sag is one of four Lower Tertiary depressions within the Liaohe Fault. Based on comprehensive utilization of drilling, well testing and seismic data, the fluid pressure characteristics of Damintun Depression are systematically studied and discussed. Based on the acoustic logging data of 57 wells, the mudstone pressure characteristics in the depression can be classified into normal pressure, abnormal pressure or strong overpressure. According to the pressure test data of 391 points in 15 2 wells, The pressure gradient is close to 1. The distribution of fluid pressure, residual pressure and pressure coefficient of 47 seismic sections are calculated by the formula method. The pressure system of the inner section of the depression is generally composed of normal pressure, weak overpressure and strong Overpressure 3 parts. In addition, according to the basic principles of fluid pressure evolution and actual data of drilling, lithology and well testing, the evolution of pressure history in Damintun depression is simulated, which can be divided into initial accumulation of overpressure, partial release of overpressure and overpressure Re-accumulation of three stages. In general, the overpressure intensity of the Damintun depression is lower than that of other parts of the Bohai Bay basin