Petrovietnam Journal

Results of seismic surveys offshore the northern part of Bac Bo Gulf

Nguyen Thu Huyen — 2021-05-31

About 25,000 km of 2D and 6,500 km2 of 3D seismic data have been acquired on the northern part of Bac Bo Gulf. The results of seismic activities help to accurately identify the geological structure and characteristics of the Miocene reservoir and the buried carbonate basement, cavities and fractures which distribute in the inverse zone of blocks 102, 104, and 106, and assess their oil and gas potential. In addition, these seismic data allow the identification of non-structural and stratigraphic traps in the areas considered to be rich in potential, such as the neighbouring areas of Ham Rong and Ky Lan structures as well as other areas of blocks 103&107, and 101 & 100/4. Because of the limitation of the legacy 2D/3D seismic data, it is necessary to continue to deploy new seismic acquisition on a larger area and apply new technologies to improve the efficiency of oil and gas exploration activities in particular and geological studies in general.

Pliocene morphological characteristics of the East Sea’s southwestern deep depression

Dang Van Bat — 2021-05-31

Pliocene morphological characteristics of the East Sea’s southwestern deep depression at the scale of 1:250,000 based on co-originated surfaces are presented in this paper. The study shows that the morphological characteristics of the study area in the Early, Middle and Late Pliocene reflect a clear structure of the Earth’s crust and consist of continental shelf, continental slope, deep sea floor and depression zone. The main morphological units in the Pliocene include the paleo-morphological continent and morphological sea floor. The morphological sea floor consists of horizontal surfaces, plane surfaces and slope surfaces. The morphological units in the Late Pliocene inherit features of the Early and Middle ones. Their inheritance is most visible on the guyots and the horst mountains existing throughout the Pliocene period. In the Early and Middle Pliocene, the paleo-continent mass distributed in a limited area in the north-west corner of the study area. In the Late Pliocene, the paleo-continental mass disappeared and the whole study area was dominated by the sea. Hence, the Early and Middle Pliocene were the period of transgression into the Vietnam continent. In the Late Pliocene, the study area was submerged in the deep sea.

Applications of response surface methodology and Box-Behnken design to optimise fracture treatment design for Lower Miocene reservoirs, Bach Ho field

Nguyen Huu Truong — 2021-05-31

The paper presents the results of application of the response surface method and the Box-Behnken design of experiments to investigate the influence of hydraulic fracturing parameters on the economic performance after fracture treatment in the Lower Miocene reservoirs of Bach Ho field. The four parameters comprising viscosity of fracturing fluid, pump rate, proppant concentration, and fracture length are optimised by maximising net present value (NPV). The NPV is calculated based on the cumulative oil production at the post fractured and the based case under transient flow behaviour for a three-year period. From the results of the sensitivity analysis, it is possible to evaluate the main parameters that affect the net present value (NPV), as well as the interaction of the parameters to the NPV.

P&A cost management: Some international experience and practical application in Vietnam

Phung Mai Huong — 2021-05-31

The article analyses the factors affecting P&A (Plug and Abandonment) cost, which makes up a great proportion in the decommissioning cost structure. The authors review the P&A steps in theory, regulations, and practice. At the same time, factors affecting P&A decisions and P&A planning are studied in terms of work and cost as well. On that basis, the article presents some existing P&A cost estimation methods and their possible applications in Vietnam. Elements that may help optimise P&A budget in particular and decommissioning budget in general are also reviewed and presented.

Corporate portfolio managment approaches and recommendations for Vietnam Oil and Gas Group

Phan Thi My Hanh — 2021-05-31

Corporate portfolio management plays an important role in ensuring the maintenance and development of production and business operations in the long term. The article gives an overview of corporate portfolio management approaches, including the logics that drive corporate strategic investment decisions and the tools to analyse the corporate portfolio commonly used by corporations around the world; from which recommendations are made for Petrovietnam’s corporate portfolio management.