Petrovietnam Journal

Palynomorph and palynofacies studies on the lower Miocene succession in the eastern margin of the central trough of Nam Con Son basin

Mai Hoang Dam — 2021-09-30

Palynofacies study in palynology analysis is an interdisciplinary method of research combining stratigraphy, sedimentology and organic geochemistry to determine the depositional environment and assess the source rock potential. This study was caried out on rock samples collected from the Lower Miocene sediments of the CS1 and CS2 wells at the eastern margin of the central trough of the Nam Con Son basin. The aim of the study is (1) to clarify the sedimentary deposition environment in relation to the physicochemical conditions of the organic matter, (2) to evaluate the thermal maturity of the organic matter, and (3) to assess the source rock potential.

The studied results show that three palynofacies were identified, corresponding to four environmental assemblages belonging to shelf marine sediments; the thermal maturity level of organic matter from immature to mature, in which the thermal maturity level of the CS2 well is higher than that of CS1; the hydrocarbon potential of the source rock is oil prone in palynofacies 1 and gas prone in palynofacies 2 and 3.

Palynofacies study is important in the exploratory phase, providing necessary data to evaluate the hydrocarbon potential of the source rock, in addition to the information obtained from the biostratigraphy and sedimentary petrology analysis.

Deltaic environments and reservoir sandstones of Nam Con Son basin

Tran Khac Tan — 2021-09-30

The shoreline is the transition zone that separates nonmarine processes and environments from marine processes and environments. In this zone, there are both marine and nonmarine influences. Delta is complex bodies of sediments deposited at the river mouths. Its morphology and stratigraphy are dependent on the volume of the river and its drainage area as well as on several other factors such as the sediment load of the topography, and the nature and intensity of nearshore marine processes that act to rework and disperse the sediment once it reaches the coast. Also, sediment can be supplied to the shore zone from offshore and alongshore sources, which are unrelated to a river.

Deltaic sandtones play as an important reservoir for oil and gas in many basins around the world. Four major facies and environment types were interpreted using well logs and cores data of wells CS-1X and ST-2X in the Nam Con Son basin. These facies include the delta plain, delta front, shoreface, and pro-delta.

Key factors shaping energy transition strategies of asia’s national oil and gas companies

Dao Minh Phuong — 2021-09-30

In the trend of energy transition, the world’s major oil and gas companies are shifting their investments from oil and gas to renewable energy to fulfil commitments for a “low carbon” or “lower carbon” future. While maintaining their traditional activities, national oil and gas companies (NOCs) have begun to set specific low-carbon targets and invested in renewable energy. The article analyses the key factors shaping the energy transition and climate change mitigation strategies of NOCs in Asia such as Petronas, Pertamina and PTT.

Assessment of environmental impacts and risk of incidents during construction and operation of solar power projects

Le My Nhan Nguyen — 2021-09-30

The article assesses the impacts of large-scale solar power projects on the environment at each stage of project implementation, including the management and treatment of waste from expired solar panels, and incidents occurring during the construction and operation of solar power projects. The impacts are identified and evaluated, which will serve as a basis for analysing the project’s effectiveness in the context of economic development associated with the goal of sustainable development of the natural environment and the society. On that basis, the authors propose research directions to help state management agencies promulgate relevant regulations in the process of approval as well as environmental management and monitoring of solar power projects in the future.

A study on air atomisation for the diesel oil system of Vung Ang 1 Thermal Power Plant

Nguyen Van Minh — 2021-09-30

At coal-fired thermal power plants, diesel oil (DO) is used during the startup/shutdown of the unit or in case of unstable combustion mode. Each restart of the boiler consumes more than 500 tons of DO, equivalent to VND 12 billion.

To lower power production costs and maximise profits, the Operational Unit of Vung Ang 1 Thermal Power Plant, Petrovietnam Power Corporation have studied to apply air atomisation instead of the traditional steam atomisation for DO burners. The obtained result shows that the new method helps reduce DO consumption to less than 200 tons/start-up, contributing to lower production costs, maximise profits and especially to increase competitiveness in the electricity market.