公开(公告)号：US3908789A

公开(公告)日：1975-09-30

申请号：US41110273

申请日：1973-10-30

Applicant: TEXACO INC

Inventor： ITRIA OSWALD ALFONSO

IPC: G01V1/13 ,  G01V1/10 ,  G01V1/08

CPC classification number: G01V1/13

Abstract: In seismic delineation of sedimentary section below the surface of a seismic energy propagation medium, methods and articles for carrying out the methods are disclosed. A basic method for generating and shaping a seismic energy pulse comprises (1) generating a first energy pulse downwardly through the shortest distance to a point at the lower end of a vertical straight explosive material for forming a compressional forward portion of the seismic energy pulse, and (2) generating a second energy pulse later to form a rarefactional aft portion of the seismic energy pulse. By varying the length of the explosive material the lengths of the forward and aft portions are varied for controlling the shape of the seismic energy pulse, and by varying the position of the point of ignition of the linear explosive material, additional shaping of the seismic energy pulse results. A basic article for carrying out the above method comprises a vertical straight explosive material, as a straight piece of ''''Primacord,'''' suspended at a desired predetermined depth, cut to a predetermined length, and detonated by a blasting cap at a predetermined position from the upper end to the lower end for producing a seismic energy pulse of the desired shape, a very thin elongated shape being preferable for attenuation of both the secondary bubble amplitude and time duration.

Abstract translation: 在地震能量传播介质表面以下的沉积段的地震描绘中，公开了实施方法的方法和制品。 用于产生和成形地震能量脉冲的基本方法包括：（1）产生第一能量脉冲，该第一能量脉冲向下通过垂直直爆炸材料的下端的最短距离，以形成地震能量脉冲的压缩前部， 和（2）稍后产生第二能量脉冲以形成地震能量脉冲的稀疏后部。 通过改变爆炸材料的长度，改变前部和后部的长度以控制地震能量脉冲的形状，并且通过改变线性炸药材料的点火点的位置，对地震能量进行额外的成形 脉搏结果。 用于实施上述方法的基本制品包括垂直直爆炸材料，作为垂直的“Primacord”片，悬挂在期望的预定深度，切割成预定长度，并且在距离该预定位置的预定位置处由喷砂帽引爆 用于产生所需形状的地震能量脉冲的上端到下端，非常细长的形状对于二次气泡振幅和持续时间的衰减是优选的。