March 2011

FUNDAMENTAL OF

SEISMIC DATA INTERPRETATION

 

University of Indonesia – Student Chapter of Ameri­can Association of Petroleum Geologists recently held the workshop activity entitled “Fundamental of Seismic Data Interpretation” on Saturday, 12th March 2011. This workshop was taught by Mr. Paulus Tangke Allo (ConocoPhillips Indonesia). Mr. Paulus gave us a lot of knowledge about Basic Concept of Quality Control Seismic Data.

This workshop activity was held at Department of Physics, FMIPA University of Indonesia, Depok. There were 35 participants who joined this event. This event started from at 9.30 am until 4.30 pm on 12th March 2011 and divided into 2 sections (attending presentation which include asking some questions and encouraged to do the exercises) which did in such an informal and relax activity.

At the 1st section, Mr. Paulus gave a brief explana­tion of why we really need to know the quality of data before we use it. Then after that, Mr. Paulus presented about common workflow which consists of 5 steps such as Data Preparation, Data Loading, Data Quality Control, Well – Seismic Tie, and Horizon & Fault Picking.

At data preparation step, he explained us that we must have all the data that we need completely. At least we must have Sonic, Density, Gamma Ray, and Resistivity Data. Such data is a must have data, so that we have to ask the company to get those basic data. It would be better if we could have the Check­shot Data, VSP Data, or Corridor Stack

After explained about data preparation, he con­tinued to the 2nd step, Data Loading. At step, we started to do the exercise by using software to load the well data (log curve) and seismic data (2D seis­mic data). Participants may use any software they have, such as: Petrel, Geographix, HRS, Kingdom, or Opendtect; Mr. Paulus did not mind about that, as long as participants could operate that software. He also explained and presented about the importance of checking whether the data right or not by looked into the header of the data. Then he challenged the participants to load the well log data and display it in the right manner which usually company use, such as: arrange it into 5 panels and editing its scale into the right display.

After that, Mr. Paulus presented about how to load the 2D seismic data and challenged the participants to start doing the exercise of loading the 2D seismic data. He also taught us about how to identify the seismic data which still did not have good quality and must be returned to the person who responsible to seismic data processing. He also explained about noise that might happen but still in tolerance rate.

Then he presented about Well – Seismic Tie and make a synthetic seismogram from well to compare with seismic response. Also he taught us about how to do Horizon and Fault Picking. But unfortunately we did not do the exercise about the last 2 session because of the limited time. But Mr. Paulus promises us he will come again soon to continue this lesson but will more concern about the interpretation itself but no more struggling with data QC.

 

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INTRODUCTION TO GEOMECHANICS & ITS APPLICATION IN OILFIELD OPERATION

 

University of Indonesia – Student Chapter of Ameri­can Association of Petroleum Geologists held the workshop activity entitled “Fundamental of Seis­mic Data Interpretation” on Saturday, 19th March 2011. This workshop was taught by Mr. Ngurah Beni Setiawan (Schlumberger). Mr. Beni gave us a lot of knowledge about Geomechanics. Although this topic is relatively more related to Reservoir or Petroleum Engineering students, Mr. Beni presented his topic in such an interesting and in Geophysics students’ language.

This course was held at Department of Physics, FMIPA University of Indonesia, Depok. There were 32 participants who joined this event. This event started from at 10.30 AM until 04.15 PM on 19th March 2011 and divided into 3 sessions.

First session is an introduction of Geomechanics. In this session, the student is introduced to the con­cept, urgencies and application of Geomechanics, in brief. They are also provided with terminologies commonly used in Geomechanics, and some of ba­sics theories like Stress, Strains, and Poisson’s Ratio. Several fundamental of geology was also discussed including structural geology especially normal fault, and rocks’ description. This session relatively did not confusing the participants, because most partici­pants have basic concept of Physics as their academ­ic background.

In the second session students were introduced to Darcy’s Law, about the flow rate of petroleum which depends on pressure length, viscosity, and some other variables. The key is how to improve the value of Q (value rate). The course also explained the student about “Pore Pressure Management” which is urgently required in Geomechanis and Geophysics especially drilling.

The idea is of how we could drill a well which long lasting lifetime and effectively let the petroleum flows. This course probably would make all partici­pants feel bored because of lots of mathematical and physical equations, but Mr. Beni anticipated this pos­sibility by playing some short movies while explain­ing. Such way makes his presentation so much more interesting.

The third sessions’ objective was to discuss more detail on application of Geomechanics in real case studies. In this session the participants were divided into 3 groups. Each group was given the same prob­lem, about drilling a horizontal well. The challenge is to determine the best point to start the well drilling between two drilling point. Representatives of each team will present their analysis based on the pore pressure concept and geological environment.

Mr. Beni surprised the participants by finished this course early as it should not have to be and opened the new session which was sharing experience. He shared lots of things start from how to face his campus life 4 years ago, how to pass the comprehen­sive tests, how to prepare jobs’ interview, until how to anticipate boring phase in Geosciences career’s life. Mr. Beni gave the participants more than just a theory or practical, he also motivated all participants. This is what most students’ needed; UISC AAPG has been considered to insert short motivation session in another similar activity

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