EBS 329/3 : GEOFIZIK CARIGALI (GUNAAN)

Sinopsis dan Silibus

Pendedahan kepada asas penggunaan teknik-teknik geofizik utama dalam membantu proses carigali mineral dan minyak, pengumpulan maklumat ciri-ciri keadaan  keadaan struktur dan geologi bawah tanah dalam bidang kejuruteraan awam  dan memahami keadaan kimia-fizikal keadaan bawah tanah dalam pengurusan alam sekitar dan perancangan-perancangan lain (forensik dan arkeologi)

Pelajar secara teori dan praktikal didedahkan kepada penggunaan kaedah  geofizik dan kaitanya dengan sifat atau ciri fizikal keadaan bawah tanah dalam menjejaki corak, keadaan dan kandungan bawah tanah, pentafsiran data, pemodelan dan penyediaan laporan.

Dalam kursus ini penakanan diberi kepada penggunaan kaedah sesimik, kaedah elektrik, kaedah keupayaan diri, kaedah graviti dan kaedah magnet.

Pemilihan dan kesesuaian teknik-teknik geofizik berkesan dan hubungannya dengan maklumat lain (lubang gerudi dan geologi) juga akan dibincangkan.

 

 

Kuliah dan aktiviti pengajaran adalah merangkumi teori, seminar dan projek mini seperti berikut :

Seismic Survey Design

Penilaian dan Pemerkahan

Survey Design

BACKGROUND

Like the resistivity method, the refraction seismic method is employed (usually) as an active method. A source of seismic energy is initiated, and the ground motion produced by this source is recorded at various distances from the source. As you could see from your experience with the resistivity method, the application of active geophysical methods generally requires more logistical forethought than the passive methods. By this, we simply mean that there is more equipment involved and more survey parameters that must be chosen. Because of this, however, we usually have more control over noise reduction and the regions of the earth that perturb our signals than we would with a passive method.

With the seismic method, we can control even more variables related to survey design than we did with the resistivity method. In addition to the configuration of the receivers (including spacing and orientation), in the seismic method, the source can be moved independently of the receivers and different types of sources can be employed. With all of these variables and the expense of the equipment required to collect and interpret the observations, seismic methods tend to be more expensive than the other geophysical methods. Thus, reconnaissance surveys, like resistivity surveys, are often employed before acquiring seismic data in an effort to determine the necessity of doing seismic exploration and to determine the best survey design parameters to use when acquiring the seismic observations.

 

OBJECTIVES

There are five learning objectives for this project:

  • Begin to appreciate the logistical demands of employing seismic techniques,
  • Continue to develop an understanding of the various physical parameters and structures that can be constrained seismic methods,
  • Continue to practice and refine your structured decision making and survey design skills,
  • Continue to develop an understanding of the use of controlled-source geophysical methods and how they differ from natural-source methods, and
  • Improve your ability to select optimum survey parameters based on a comparison of expected signal strength and noise characteristics.
 

 

 

Note: The modelling applet may not work with some platform/browser/Java combinations.

If the sliders are not visible, or do not work, or if clicking-and-dragging does not work in the control panel, the best solution is to change platforms (computers).

In the iMac lab - use Internet Explorer for this modelling.

If you have access to a Windows machine, use that for the modelling (it will only take a few minutes). There are Windows machines in Room 315.

The Java modelling system is believed to work fully on Windows 95/98 platforms, running Internet Explorer or Netscape of version 4 or later. Macintosh machines should have the upgrade to Macintosh Runtime Java 2.1.2 or later installed, and Internet Explorer 4.* should then function.

 

 

 Nota Kuliah :     Download  dalam format pdf

 

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