# What is the evidence about internal structure of earth in terms of boundaries and their depth according to seismic velocity measurements?

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School/ Department Name School of Engineering/ Petroleum Engineering

Program Code and Title: BEPF15 – Degree of Petroleum Engineering

Course Code and Title: 151PTE 321 – Engineering Geology

Assessment Number and Title: Assessment 1 – Assignment # 1

Assessment Type: Written Assignment

Assessment Location: ACK – Online Submission

Assessment Date: Saturday 11th of July, 2020

Assessment Time/Duration: Due by: Monday 13th of July, 2020

Student Name:

Student ID:

Section (s): G2P1

Assessment General

Instructions:

 This is a calculation based project and you may use the class material such as your lecture notes, online resource, and software

such as excel (if needed).

 You may not discuss or share this project or questions related to the project with your fellow classmates or other individuals.

 Show your work, you may scan your hand work or insert excel calculation in this document.

 If you require any assistance during the assessment period, please raise communicate with me through e-mail.

DO NOT WRITE IN THE AREA BELOW

Task Number Maximum Marks Student Marks

1 6

2 5

3 4

4 10

Total Mark 25

Assessor Feedback:

Assessor Name: Dr. Seyed Mehdi Seyed Alizadeh

Date:

Assessor Signature:

Student Name: Date:

Student Signature:

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Earth is believed to have formed from different parts. What is the evidence about internal

structure of earth in terms of boundaries and their depth according to seismic velocity

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A soil particle size distribution curve is available as shown in figure 1.

Figure 1: Particle size distribution

(a) Determine the gravel, sand, silt and clay size particles by percentage of each (show all steps

Note: Use the US department of agriculture (USDA) classification system.

(3.5 Marks)

(b) Calculate uniformity coefficient, coefficient of gradation and sorting coefficient for this

sample (show all steps of your work).

(1.5 Marks)

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Total Alkalies Silica tests have been performed on a number of extrusive igneous rocks in the lab.

The results of the tests are summarized in the table below:

Sample Sodium Oxide

(wt. %)

Potassium Oxide

(wt. %)

Silica (wt. %)

Rock A 1 3 67

Rock B 8 6 55

Rock C 1 2 48

a) Determine the rock types that samples “A”, “B” and “C” belong to.

(1.5 Marks)

b) What is the equivalent plutonic igneous rock groups to each of samples A to C

according to the chemical composition of constituting minerals?

(1.5 Marks)

c) Which of the tested samples belong to acidic and mafic igneous rock groups?

(1 Marks)

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Table 1 shows percentage of different components in sandstones from a geological location as

obtained from lab analysis.

Table 1: Composition of sandstone samples

Sample No. Quartz (%) Lithics (%) Feldspar (%) Rock Type

A1 97 1 2

A2 80 3 17

A3 55 32 13

A4 40 53 7

A5 35 3 62

A6 10 5 85

A7 15 20 65

A8 20 55 25

A9 55 30 15

A10 60 12 28

a) Plot the points that correspond to each of the samples on the diagram presented in figure 2.

(5 Marks)

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Figure 2: Diagram for sandstone composition

b) Using the classification scheme which is shown in figure 3, determine the type of the each sandstone sample according to its constituent elements.

(5 Marks)

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Figure 3: Sandstone compositional classification chart