CAJ | 학술논문

重力归一化总梯度的三维计算中,将圆滑滤波因子分别引入向下延拓和导数换算响应因子中,推导了其计算公式及数值实现过程,同时给出了具体的计算步骤;对含油气球冠模型的三维归一化总梯度场特征进行了分析与研究.研究结果表明,对于含油气球冠模型来说,不同于均匀球冠模型在各个深度的切平面等值线图中表现出单峰异常的特征,其三维归一化总梯度场的特征表现为:无论在过中心剖面的等值线图还是在某个深度的切片图中,只有当截止频率取值适当时才可以表现出"两高夹一低"的典型储油气藏标志特征,若取值不当,其表现出来的特征与均匀球冠模型相似.此外,归一化总梯度场等值线图中出现"两高夹一低"的位置,往往是含油气球冠所在位置和深度.
중력귀일화총제도적삼유계산중,장원활려파인자분별인입향하연탁화도수환산향응인자중,추도료기계산공식급수치실현과정,동시급출료구체적계산보취;대함유기구관모형적삼유귀일화총제도장특정진행료분석여연구.연구결과표명,대우함유기구관모형래설,불동우균균구관모형재각개심도적절평면등치선도중표현출단봉이상적특정,기삼유귀일화총제도장적특정표현위:무론재과중심부면적등치선도환시재모개심도적절편도중,지유당절지빈솔취치괄당시재가이표현출"량고협일저"적전형저유기장표지특정,약취치불당,기표현출래적특정여균균구관모형상사.차외,귀일화총제도장등치선도중출현"량고협일저"적위치,왕왕시함유기구관소재위치화심도.
This paper introduces filter factors respectively in downward continuation and derivative calculation for calculating the three-dimensional normalized full gradient field of gravity anomaly. The authors deduced the computing formula and the process for achieving its numerical value, and then gave the specific calculation procedure. Characteristics of 3D normalized full gradient of gravity anomaly in the homogeneous oil sphere coronal model were analyzed. It is concluded that, for oil sphere coronal, the 3D normalized full gradient field has the following features: no matter whether it is in a figure of central section or in that of a slice, only when the suitable cut-off frequency is obtained can the "two folders and one low" of typical characteristic signs of oil-gas reservoir be shown; otherwise, it is similar to the model of homogeneous sphere coronal which shows characteristics of a single peak anomaly. In addition, the position of "two folders and one low" in the contour map of normalized full gradient field is usually the position and depth of the oil sphere coronal.