Introduction to Seismic Interpretation

If you want to find oil and gas accumulations, or produce them efficiently once found then you need to understand subsurface geology. At its simplest, this means mapping subsurface structure to find structures  where oil and gas may be trapped, or mapping faults that may be barriers to oil flow in a producing field. It would be good to have a map of the quality of the reservoir as well (e.g.i ts thickness and porosity), partly to estimate the volume of oil that may be present in a given trap, and partly to plan how best to get the oil or gas out of the sound. It would be better still to see where oil and gas are actually present in the subsurface reducing the risk of drilling an unsuccessful exploration well, or even following the way that oil flows throught he reservoir during production to make sure we don't leave any more of it than we can help behind in the ground. Ideally, we would like to get all this information cheaply which in the offshore case means using as few boreholes as possible.

One traditional way of understanding the subsurface is from geological mapping at the surface. In many areas however, structure and stratigraphy at depths of thousands of feet cannot be extrapolated from geological observation at the surface. Geological knowledge then depends on boreholes. They will give very detailed information at the points on the map where they are drilled. Interpolating between these control points, or extrapolating a way from them into undrilled areas is where geophysical methods can be most helpful.

Although some use has been made of gravity and magnetic  observations which respond to changes in rock density and magnetisation respectively it is the seismic method that is by far them most  widely used geophysical technique for subsurface mapping. The basic idea is very simple. Low-frequency sound waves are generated at the surface by a high-energy source (for example a small explosive charge). They travel down through the earth, and are reflected back from the tops and bases of layers of rock where there is a change in rock properties. The reflected sound travels back to the surface and is recorded by receivers resembling microphones. The time taken for the sound to travel from the source down to the reflecting interface and back to the surface tells us about the depth of the reflector, and the strength of the reflected signal tells us about the change of rock properties across the interface. This is similar to the way a ship's echo sounder can tell us the depth of water and whether the seabed is soft mud or hard rock.

So if you want to work in the sector oil and gas you have to know seismic method for sure because this method is the most powerful than any others methods in subsurface mapping.

Geophysics Expedition

I just wanna greet you. Today i am going to attend Geophysics Expedition which is located in Candi Umbul, Grabag, Magelang, Central Java.This is field session of Geophysics Expedition, in Candi Umbul lies Geothermal Surface Manifestation like hot springs, fumarol, hydrothermal deposits and maybe thermal alterations. 

Previously i have got Gravity Methods through oral selection so i will use Gravity Methods in structure identifying (you don't say!). Keep calm i am going to share my experience after Geophysics Expedition done, so happy waiting! :)

Essay To Submit As Fieldcamp Volunteer 2013 Requirement

What does exactly young geophysicist (undergraduate student) doing in fieldcamp? I don't know either, because i did neither fieldcamp nor learn geophysical methods, but i try to seek for information about fieldcamp from my senior. Now i know that fieldcamp is a final field assignment for undergraduate geophysics students where all participants have to already know about entire of geophysical methods. By using geophysical methods we must be known what exactly lies within earth sub-surface.

Fieldcamp is like knowledge and field-skill test, where we have an assignment to research geological phenomena by using the sake of geophysical methods such a deep intrusion which can be known its resistivity by using Audio Magnetotelluric (AMT) methods or Geoelectrical Sounding Methods and we also have to look for additional data like using Gravity Methods where local gravity difference can be influenced by intrusion depended on its density. Fieldcamp is an annualy program from Geophysics Departement of Universitas Gadjah Mada for Gophysics students in their 4th years, this year fieldcamp will be held in Grobogan, Central Java and has topic "Peeking Under An Oil Field" (don't look at me, i dunno either).

Honestly i haven't known yet about how geophysical tools work, thus i wanna join as a volunteer because by becoming as a volunteer i can help my seniors and myself out. By doing this "sacrifice" i hope i can build network among my seniors and i must be got a precious experience. I also wanna see the night when the result of research presented and tested by our lecturer like Prof Kirbani and the others, it must be an amazing moment and funny for sure.

But actually now i am considering whether submit this essay or not due to... #galau

PR Mekanika Analitik Jilid 2

berhubung udah malem (gw nulis postingan ini saat jam dinding kmar gw menunjukan pukul 23.24 WIB) dan gw udah ngantuk langsung aja monggo download penyelesaian PRnya, semoga dapat membantu teman-teman dalam belajar. Oh iya sebelumnya gw minta maaf dulu karena disamping gw udah capek, soal PRnya juga setingkat Dewa 19 maka dari itu ada beberapa nomer yang belum terselasaikan.

 karena gw pernah kurus

bagi temen-temen yang bisa menyelesaikan sisanya tolong ajari yaaa, thanks before :) salam unyu :3

Gelombang Homework

eh ketemu lagi dengan gw, kali ini dalam edisi PR Gelombangnya Pak Budi. Setelah bertapa di gunung lima jari gw dapet wangsit agar berguru dengan temen gw anak fisika yang bernama Khoirul Faiq juga sesepuh geofisika di angkatan gw si Alutsyah "mbah kakung" Luthfian. Mereka adalah dua sosok yang telah mengajari gw deret fourier dari gak tau sama sekali hingga sama sekali gak tau #eh, maksud gw jadi agak tau sama sekali walau ujung-ujungnya tetep sok tau.

kiri-kanan: mas bayu (tek mesin ugm), Intan (teladan 2015), gw (pria tertampan diantara ibu-ibu arisan)

dek unyu dan felix

sebagai referensi kalian dapat mengunjungi blog mbah kakung tentang deret fourier sehubungan dengan postingan ini gw mau bagi-bagi jawaban PR yang bisa diunduh disini. mohon koreksinya apabila terdapat kesalahan. selamat belajar! :D

Mekanika Analitik

Halooo semalat datang di blog gw

Berhubung ada PR mekanika analitik dari pak imam maka gw kasih jawabannya, but correct me if i wrong ya, namanya juga belajar. oke enjoy reading!

klik disini untuk mengunduh jawabannya :)

how to speak english fluently

woooow setelah sekian lama gw akhirnya ngepost juga, kali ini gw mau bagi-bagi tips buat yang mau cas-cis-cus ngomong bahasa inggris nih, semoga bisa membantu! check this out!

RULE 1: Always Study and Review Phrases, Not Individual Words

Never study a single, individual word. Never. When you find a new word, always write down The Phrase it is in. Always.

When you review, always review all of the phrase,.. not the word.

Collect phrases.

Your speaking and grammar will improve 4-5 times faster. Always write the complete phrase.

Never again study a single word. Never write a single word in your notebook, Learn Phrases Only.Phrases are GROUPS of words that naturally go together.

**RULE 2: Don't Study Grammar

Stop studying grammar.

Stop studying grammar.

Right now. Stop. Put away your grammar books and textbooks. Grammar rules teach you to think about English, you want to speak automatically-- without thinking!

So Rule 2 is: Don't Study Grammar!

**RULE 3: The Most Important Rule-- Listen First

What is the rule that Humberto found? Simple. The rule is listening.

Listening, listening, listening.

You must listen to UNDERSTANDABLE English. You must listen to English EVERYDAY. Don't read textbooks. Listen to English.

Its simple. That is the key to your English success. Stop reading textbooks.

Start listening everyday.

**Learn With Your Ears, Not Your Eyes

In most schools, you learn English with your eyes. You read textbooks. You study grammar rules.

Spend most of your study time listening- that is the key to great speaking.

**RULE 4: Slow, Deep Learning Is Best

The secret to speaking easily is to learn every word & phrase DEEPLY. Its not enough to know a definition. Its not enough to remember for a test.

You must put the word deep into your brain. To speak English easily, you must repeat each lesson many times.

You must learn English deeply.

Learn deeply, speak easily.

Learn deeply, speak easily.

How do you learn deeply? Easy-- just repeat all lessons or listening many times. For example, if you have an audio book, listen to the first chapter 30 times before you go to the second chapter. You could listen to the first chapter 3 times each day, for 10 days.

**RULE 5: Use Point Of View Mini-Stories

I call these stories "Point Of View Mini-Stories". They are the most powerful way to learn and use English grammar automatically.

Use Point of View Stories for Automatic Grammar

Use Point of View Stories for Automatic Grammar

You must learn grammar by listening to real English. The best way is to listen to the same story... told in different times (points of view): Past, Perfect, Present, Future.

How do you do this? Easy! Find a story or article in the present tense.

Then ask your native speaker tutor to write it again in the Past, with Perfect tenses, and in the Future. Finally, ask him to read and record these stories for you.

Then you can listen to stories with many different kinds of grammar. You don't need to know the grammar rules. Just listen to the Point of View stories and you will improve grammar automatically!

**RULE 6: Only Use Real English Lessons & Materials

You learn real English if you want to understand native speakers and speak easily. Use real magazines, audio articles, TV shows, movies, radio talk shows, and audio books.

Learn Real English, Not Textbook English

Learn Real English, Not Textbook English

To learn real English, you must listen to English that native speakers listen to. You must watch what they watch. You must read what they read.

Listen only to real English

Listen only to real English

Listen only to real English

How do you learn Real English? It's easy. Stop using textbooks. Instead, listen only to real English movies, TV shows, audio books, audio articles, stories, and talk radio shows. Use real English materials.

**RULE 7: Listen and Answer, not Listen and Repeat

Use Listen & Answer Mini-Story Lessons

Use Listen & Answer Mini-Story Lessons

In each Mini-Story Lesson, a speaker tells a short simple story. He also asks a lot of easy questions. Every time you hear a question, you pause and answer it.

You learn to answer questions quickly-- without thinking. Your English becomes automatic.

How can you use Listen & Answer Stories? Easy! Find a native speaker tutor.

Ask him to use this method: Ask him to tell a story... and to constantly ask you easy questions about it. This will teach you to think quickly in English!

You can also find Listen & Answer lessons. They will teach you to think quickly in English.