三度体球冠模型重力异常计算方法及其重力归一化总梯度场特征  

THE CALCULATION OF GRAVITY ANOMALY ABOUT THE MODEL OF THREE DIMENSIONAL SPHERE-CORONAL AND ITS CHARACTERISTICS OF GRAVITY NORMALIZED FULL GRADIENT FIELD

作　　者：张凤旭[1] 孟令顺[1] 张凤琴[1] 吴东国[2] 林泽富 

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026 [2]中国石化集团新星公司西南石油局第二物探队,四川德阳618000 [3]黑龙江地质调查总院哈尔滨分院,黑龙江哈尔滨150080

出　　处：《物探化探计算技术》2005年第1期39-42,共4页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中石化总公司"十五"攻关项目(P0000202)

摘　　要：提出利用铅垂柱体薄片作为面元的面元积分法,计算三度体球冠重力异常的计算公式,用三度体球冠模型模拟三度背斜体,计算了均匀密度球冠模型、非均匀密度储油球冠模型的重力异常。最后通过误差分析,验证了该方法的可行性。采用波数域重力归一化总梯度计算方法,计算了均匀密度球冠模型、非均匀密度储油气球冠模型GH场,发现似三度背斜体与二度背斜体有相似的GH场等值线特征,似三度贮油气藏背斜构造的GH场亦表现出明显的"两高夹一低"的储油典型标志。所以,可以用非均匀密度三度体储油球冠模型模拟三度贮油气藏背斜构造。The paper proposes the formula of calculating three-dimensional sphere-coronal by surface integral method of cylinder-slice. Using the three-dimensional sphere-coronal to model 3-D anticline, the gravity anomaly of the model of symmetrical-density sphere-coronal and asymmetric-density oil storage sphere-coronal were calculated. By error analysis, the validity of the above method is proved. We calculated and analyzed full gradient of gravity anomaly value of two kinds of models of sphere-coronal in wave-number domain, in which we discovered that there are similar characters between 3-D anticline and 2-D one. At the same time, oil storage sign of 'one less value between two high value' was put up in the GH field of proximate 3-D oil storage anticline.

关 键 词：重力异常 背斜构造 油气藏 面元 非均匀 等值线 梯度场 归一化 储油 线特征 

分 类 号：P618[天文地球—矿床学] TP391[天文地球—地质学]