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Abstract

Содержание

1.GENERAL DESCRIPTION OF WORK

1.1 Background studies

The relevance of research due to the need to replenish the oil resources of the country as a guarantee of its independence and improve the socio-economic conditions.

1.2. The aim of work

Investigation of the features of the geological structure of oil fields area for optimal estimation of reserves and the maximum extraction of mineral raw materials

1.3. Objectives of research

1. Study area and geological structure of deposits according to various sources.

2. The study of sedimentary features of oil and gas formations south of Iraq and the evaluation of reservoir properties of oil-bearing rocks and rock-flyuidouporov.

3. Macroscopic and microscopic study of the mineralogical and petrographic composition of the oil-bearing rocks.

4. Investigation of physico-mechanical properties of oil-bearing rocks.

5.Evaluation of reserves and resources of oil and gas fields area.

1.4. The object of study

Oil and gas fields of Mesopotamia.

1.5. Subject of research

Geologic features and rock properties that determine the oil content.

1.6. research Methods

1. The analysis of geological and geophysical data.

2. petrophysical methods.

3. Methods for studying the physical and mechanical properties of rocks.

4. The method of calculating oil reserves.

1.7. The scientific novelty

1. We study the geological conditions of formation of oil and gas area. It is proved that the reservoir rock suite Mishrif by erosion, destruction of a strong and dissolution processes have a high degree of heterogeneity of reservoir properties and are hydrophobic.

2. For the first time for the fields south of Iraq justified the technology of gas exposure to enhance oil recovery.

3. As a result of a detailed study of the geological structure of oil and gas facilities in the region proved energy-resource-saving technology - without compressing the gas influence.

1.8. The practical value

This region is of great importance to the economy of Iraq, due to the large volume of oil and gas resources. This study will help to solve the basic problems of oil companies to maximize the extraction of oil from reservoir rocks.

1.9. Апробация результатов

Предполагается публикация статьи и доклад на конференции.

2. Geological characteristics of study area

For the region is characterized by a tectonic influence on the development of the Arabian plate geological processes. Since Iraq is on the north-eastern edge of the Arabian plate, he is in the past geological periods was under the influence of multi-stage tectonic movements. The area experienced a period of tectonic activity in the Caledonian, Hercynian and Alpine orogeny. Iraqi territory are usually divided into three major tectonic zones (Fig. 1)

1. Zone - the break. This zone is located in the extreme north-east Iraq, adjacent to the Zagros mountains and does not contain petroleum deposits.

2. Zone of the Zagros fold belt. Located in northern Iraq, contains most of the fields in northern Iraq.

3. Area of Mesopotamia basin. This pool is located in the central and southern Iraq. Pool includes most of the fields south and center of Iraq.

State diagram of Moore FSM

Figure 2 – State diagram of Moore FSM
(animation: 10 frames, 5 cycles of repeating, 160 kilobytes)
(xi – input signals, yi – bites of state code, zi – output signals)

Mesopotamian basin was formed in the Lower Permian as a result of manifestation of several phases of tectonic development. Of greatest interest here is the field Halfa. The field is located in southern Iraq and south-Amara. The object is regarded as one of the five supergiant oil fields and has great prospects. The field consists of elongated anticlinal dome-shaped structures, which extend in a northwesterly direction. Dimensions of the structures is about 30 km long and 10 km in width. Axial displacement of the structures have relative to each other in a north-westerly direction. Power overlying sediments increases and varies from 70 m to the Tertiary basin up to 190 m in the Cretaceous formation Mishrif. In the area of ??the Lower Cretaceous basin Ritaui capacity reaches 230 m.

3.SUMMARY OF RESULTS

Investigated a number of features of geological structure south of the Iraqi gas and oil presence of deposits. Found that the oil deposits are confined to the anticlinal structures. The structures have a northern strike and close to each other. Regional structures have aged for a gas impermeable lithological horizons-tires. One of the main oil reservoirs is a suite Mishrif Late Cretaceous (Cenomanian) age. Sweet formed in a shallow sea with changing facies from the lagoon to the reef limestones hydrophobic. Species differ in inhomogeneous petrophysical properties (different types of pores, cracks, channels). These properties affect the recoverability of oil from the bowels and are one of the possible reasons for the decline in oil production. The analysis of international experience, modern methods of enhanced oil recovery (EOR) shows high efficiency gas technologies in the development of oil fields in many countries (Russia, USA, Canada, Venezuela, UAE, Qatar, Kuwait). These technologies are effective for carbonate reservoirs. Studies of the geological structure of southern Iraq and carbonate reservoirs, and the results of pooling the data on the use of advanced EOR technologies demonstrate the feasibility of gas exposure on the roof part productivity suite Mishrif southern Iraq within the Zubair oil field through the bypass gas from a nearby gas field "G" with a high formation pressure, ie, without compression. As a result of mathematical calculations to derive a system of differential equations describing the dynamics of change in oil-saturated and gas-saturated pore volume and reservoir pressure. Produced by technological calculations, which showed that, depending on the rate of gas injection varies significantly daily oil production. So, if gas injection in a volume of 1 million m3/day daily oil production increased by 40%, while rates of injection 2 million and 3 million m3/day m3/day production increased by 2.4 and 3.3 times respectively . Based on the above developed a number of recommendations. It is considered inappropriate to use the suite Mishrif flooding in the fields of southern Iraq and the exploitation of gas fields in foreign companies to export gas. Must first use the gas for enhanced oil recovery and electricity generation. Studies have shown the possibility of re-used in the field of Zubair gas (after compression) for injection into oil reservoirs to enhance oil recovery in one of the closely spaced Tuba oil field, North Rumaila, Bean died.

Conclusion

1. The peculiarities of geological structure of southern Iraq, which significantly affect the recoverability of oil from the interior, especially the heterogeneity of petrophysical properties Formation Mishrif.

2. The analysis of international experience, modern methods of enhanced oil recovery (EOR), which has shown high efficiency gas technologies in the development of oil fields.

3. Research fields of geological features, the results of mathematical and technological calculations have shown the effectiveness of gas technologies in the development of Zubair oil field in southern Iraq.

4. Recommendations to increase oil production in the region, taking into account the national interests of Iraq.

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