June 2010

Geophysics UI Field Trip To Karangsambung

3rd – 8th June 2010

Karangsambung, Kebumen, Central Java

Karangsambung Fieldtrip has been a requirement for being a real geoscientist University of Indonesia. This annual activity held on 3rd – 8th July 2010 by UI Student Chapter of AAPG and participated by 28 students, 1 assistant, and 2 lecturers as a fieldtrip leader and guest lecturer.

We learned anythings about subsurface object, fault, measuring dip, strike, and knowing location by using geological compass. We also learned about lithology in geological concept. Having seen geological object we will understand how was its form and also the structure on it. Practicing the theoritical concept in to real field, make us knowing deeper about geoscience knowledge.

This is our second fieldtrip for 2007 students after our last first field trip at jonggol. We choose one of the most famous place for geoscientist, Karangsambung. Karangsambung field located 19 Km north of Kebumen, Central Java. There’re a lot of geologic phenomena that will improve our knowledge about general geology, such as pattern of several soil, geological structure, environment of deposition, etc. Because of that reason, since 1982 University of Indonesia always held field trip at the location.

In Karangsambung, we have learned about the reconstruction (down to pre-tertiary age), some geological structures that difficult to find in another place in Java Island, and also learned about general insight of mélange zone that generate metamorphic rock. Furthermore, we will try to recognize the pattern of several soils that generated by certain lithology as a strategy to estimate the boundary of a formation when there is no river.

In addition, the trip was very elucidating, we have learn so many geological facts, and get a clearer geological concepts in our mind. We all hope that this knowledge would help when we begin our career as a geoscientist.



“The Emphasis of Empowering Geology and Geophysical Abilities to Bring out Qualified Indonesian Geoscientist”

11TH – 13TH JUNE 2010

PUSDIKLAT PT Askes (Persero) Jln. Raya Puncak Km 48 No. 14 Cisarua – BOGOR – West Java

AAPG SC Indonesia University & AAPG SC Trisakti University

Leadership is a winning combination of personal traits and the ability to think and act as a leader, a person who directs the activities of others for the good of all. Anyone can be a leader, even if the only person they’re leading is themselves. While leadership is easy to explain, leadership is not so easy to practice. Leadership is about behavior first, skills second. Good leaders are made not born. They develop through a never ending process of self-study, education, training, and experience.

With rapid changes in the global economy, empowering individuals to envision and realize their own goals as well as to develop competences for a well-functioning society are seen as important outcomes for education. Companies are looking for multi-skilled employees that can adapt and contribute to the changing business environment of their companies. However, to what extent and in that ways should university education be related to graduate employability? While all students have to go through the process of transition from education to work, are they properly prepared themselves for the workplace? These are some of the issues to be discussed and answered in these three days of geosciences student leadership development training.

We provided opportunities for participants to get involved and learned skills that can be transferable to the workplace or community. With Mr. Tubagus Haryono (Head of BPH Migas) and Mr. Darwin Silalahi (CEO of Shell Indonesia), we have learned about the Significant process of Petroleum Industry in Indonesia, which is discussed about the human needs of energy and how the industry way to produce that. We also have a clear understanding by the ex President of AAPG Student Chapter (Geovani Christopher, Damianus Fritz, & Abdullah Nurhasan) about how important is the role of AAPG student chapter in making such a great atmosphere in Universities, by blending the academic and organization to enrich the students experience.

Many people say that our event here was SEAPEX look a like. But there was a difference by having an outbound. This outdoor team building was instructed by Mr. Kris Hendardjo, who is well known as our Lecturer in campus, and also a great motivator. The outbound is using a soft impact to minimize the chance of the participant getting injured during this event. We had a lot of game during this outbound which has a meaning on each part, such as communication, teamwork, decision making, coordination, etc.

The indoor part is not less interesting than the outbound. We learned a lot about being a real leader. With Mr. Dharmawan Samsu (Exploration Manager of BP), we were mixed in a group and having many discussions about the attitude and anything about the leadership and management. We also had a great workshop of CV making and interview tips by Ms. Dyah Tribuanawati on Sunday, which was gave us such a great vision of how to apply a job after we graduate.

In addition, the event and the trip were very fun, the event location which is in Puncak has give the side refreshment too. We all hope that this experience and knowledge would help when we begin our career as a geoscientist.


AVO Analysis Workshop

June, 19th 2010

by : Leonard Lisapaly

American Association of Petroleum Geologists Student Chapter University of Indonesia recently held the workshop activity entitled “AVO Analysis Workshop”. This workshop was taught by Mr. Leonard Lisapaly, Geophysicist of Fugro Jason. In this workshop, all participants had the knowledge of AVO (Amplitude versus Offset) in seismic and well log data. Besides teaching the basic concepts of AVO Analysis, Mr. Leo also gave us the practical knowledge by using Matlab that had installed in every participant’s notebook.

AVO Analysis workshop was held on June 19th 2010 at Seminar Utama Room, Physics Department, University of Indonesia. This workshop was limited only by 30 participants, but then has participated by 33 participants. This workshop began at 10.00 am and ended at 4.30 pm. During that time, all participants had encouraged to do the exercises and asking some questions when Mr. Leo told us the basic concepts of AVO Analysis.

For the first session, Mr. Leo taught us about Basic NMO Principle and its concordance with AVO theory. He told that seismic amplitudes are varied with offset or angle. From seismic data we could generate gathers data and stacked data. Through those data we can analyze inversion or amplitude – versus – offset. By AVO analysis we can extract the seismic attributes from gathers data and after that we can get primary velocity, secondary velocity, and density on each earth layer. As we all know, earth has layers and seismic just know the layers by the differences of velocity on each interface, and AVO is attribute of that interface. Each interface in the same angle had different offset, reflection coefficient, so that they have different littology. CDP gathers was one of the origin information that we can make an AVO analysis by gathering all signals that have the same common – depth – point, and we will have full – fold gathers by that data. NMO, or normal – move – out, is the method of straightening the uncorrected seismic data. In NMO, we can see the difference between synthetic and real seismic data by mismatch on the far – offset that have generated by noise and anisotropic medium of observed area.

After the brief explanation about NMO principle, then Mr. Leo taught us about Basic Reflectivity Concept. Firstly, he explained and refreshed our basic concepts of seismology on seismic basic components, which are reflectivity, travel time, and wavelet. By deeper understanding on those components, then we can step over to the amplitude impedance that is generated from reflectivity. It tells us the information about mechanical properties of subsurface rocks through the wave velocity and density of each rock. The greater AI means the greater wave velocity and density at general. Seismic full data can be generated by convoluting the wavelet and AI of every layer. AVO analysis also based on Snell’s law of reflectivity that applicable in every medium. By derivation and expansion of the Snell’s formula of reflectivity, we can use now Zoeppritz’s, Aki and Richards’, and Shuey’s formula that are useful in seismology analysis.

On the second session, all participants were challenged to do some exercises and get prizes from Mr. Leo. There are three exercises that separated by the difficulty level. The first exercise is Reflectivity Curve Making. We were given the scripts of Matlab file that applicable in AVO Analysis. After break time, participants were also challenged to do two more exercises: AVO modeling and AVO analysis. At last, by analyzing the crossplot result on the distribution of intercept versus gradient, we then know about which quadrant that the formation lie on.


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