scholarly journals Evaluating the Implications of Lineaments on Petroleum Fields: South Sumatra, Indonesia

2021 ◽  
Vol 6 (2) ◽  
pp. 77
Author(s):  
Tapiwa Frank Kwachara Ngoroyemoto
Keyword(s):  
Low Cost ◽  
Oil Prices ◽  
Oil Production ◽  
Field Work ◽  
Petroleum Exploration ◽  
Landsat 8 ◽  
Extensional Tectonics ◽  
Geological Maps ◽  
Petroleum Fields ◽  
Lineament Extraction

Declining oil prices has led to a reduction of petroleum exploration as oil production as no longer a lucrative area of investment as in the previous years. Current exploration activities are supported by field work which are intensive considering the resources required. There is need to develop low cost methods to delineate areas of potential hydrocarbon resources. This research uses Land Satellite (Landsat) 8 Operational Land Imager (OLI) for alteration extraction, Shutter Radar Topography Mission (SRTM) for lineament extraction, Geological maps to develop a low cost method of petroleum exploration. The results indicate high OH bearing alterations on the Gumai and Kasai formation, a seal rock. Extensional tectonics is responsible for the migration of petroleum from the subsurface.  It is suggested that future exploration be concentrated on the Gumai and Kasai formation based on evidence of micro seepage.

New Gel Aggregates To Improve Sweep Efficiency During Waterflooding

2011 ◽  
Vol 14 (01) ◽  
pp. 120-128 ◽  
Author(s):  
Guanglun Lei ◽  
Lingling Li ◽  
Hisham A. Nasr-El-Din
Keyword(s):  
Low Cost ◽  
Oil Production ◽  
High Water ◽  
Resistance Factor ◽  
Water Production ◽  
Sweep Efficiency ◽  
Low Viscosity ◽  
Productivity Decline ◽  
High Water Cut ◽  
Water Cut

Summary A common problem for oil production is excessive water production, which can lead to rapid productivity decline and significant increases in operating costs. The result is often a premature shut-in of wells because production has become uneconomical. In water injectors, the injection profiles are uneven and, as a result, large amounts of oil are left behind the water front. Many chemical systems have been used to control water production and improve recovery from reservoirs with high water cut. Inorganic gels have low viscosity and can be pumped using typical field mixing and injection equipment. Polymer or crosslinked gels, especially polyacrylamide-based systems, are mainly used because of their relatively low cost and their supposed selectivity. In this paper, microspheres (5–30 μm) were synthesized using acrylamide monomers crosslinked with an organic crosslinker. They can be suspended in water and can be pumped in sandstone formations. They can plug some of the pore throats and, thus, force injected water to change its direction and increase the sweep efficiency. A high-pressure/high-temperature (HP/HT) rheometer was used to measure G (elastic modulus) and G" (viscous modulus) of these aggregates. Experimental results indicate that these microspheres are stable in solutions with 20,000 ppm NaCl at 175°F. They can expand up to five times their original size in deionized water and show good elasticity. The results of sandpack tests show that the microspheres can flow through cores with permeability greater than 500 md and can increase the resistance factor by eight to 25 times and the residual resistance factor by nine times. The addition of microspheres to polymer solutions increased the resistance factor beyond that obtained with the polymer solution alone. Field data using microspheres showed significant improvements in the injection profile and enhancements in oil production.

scholarly journals Combining Satellite Multispectral Imagery and Topographic Data for the Detection and Mapping of Fluvial Avulsion Processes in Lowland Areas

2020 ◽  
Vol 12 (14) ◽  
pp. 2243 ◽  
Author(s):  
Giulia Iacobucci ◽  
Francesco Troiani ◽  
Salvatore Milli ◽  
Paolo Mazzanti ◽  
Daniela Piacentini ◽  
...  
Keyword(s):  
Methodological Approach ◽  
Field Work ◽  
Network Evolution ◽  
Landsat 8 ◽  
Multispectral Imagery ◽  
Economic Activities ◽  
Topographic Analysis ◽  
Climate Conditions ◽  
Topographic Data ◽  
Remote Sensing Techniques

Fluvial avulsion is an important process in the dynamics of the riverscapes and plays a key role in the drainage network evolution in lowland areas, also influencing past and present social processes and economic activities. Crevasse splays represent significant geomorphological features for understanding the fluvial morphodynamics in lowland areas dominated by avulsion processes. Within wide floodplains characterized by very low elevation ranges, the detection and accurate mapping of crevasse splay morphology and features, such as crevasse channels, levees, and deposit, can be very challenging considering floodplain extension, anthropic impact on the natural channels network, logistic difficulties, and in some cases, climate conditions that prevent field work. This research aims at improving the detection and mapping of crevasse splays in lowland areas through the combination of different remote sensing techniques based on optical multispectral imagery and topographic data derived from satellite earth observation missions. The Lower Mesopotamia Plain (LMP) offers a unique opportunity to study the avulsion processes because it presents numerous examples of crevasse splays, characterized by different sizes and states of activity. Furthermore, in this area, a strong correlation exists between the formation and development of crevasse splays and the expansion of agriculture and early societies since the Early Holocene. Different supervised classification (SC) methods of Landsat 8 satellite images have been tested together with topographic analysis of the microrelief, carried out based on two different 1-arcsec DEMs (AW3D30 and GDEM2). The results of this study demonstrate that the combination of multispectral imagery analysis and topographic analysis of the microrelief is useful for discerning different crevasse elements, distinguishing between active and relict landforms. The methodological approach proved helpful for improving the mapping of erosional and depositional landforms generated by the avulsion process and, in the study area, provided the best results for the active landforms.

Australian onshore petroleum acreage and releases 2017

2017 ◽  
Vol 57 (2) ◽  
pp. 345
Author(s):  
Jeff Haworth
Keyword(s):  
Petroleum Industry ◽  
Oil Prices ◽  
Oil Price ◽  
Manufacturing Industries ◽  
Petroleum Exploration ◽  
Australian State ◽  
Local Manufacturing ◽  
Low Levels ◽  
Future Policy ◽  
Exploration Activity

This paper is a compilation of material from state and territory jurisdictions regarding onshore acreage and its availability for petroleum exploration in 2017. Australian state and territory governments continue to support investment in the petroleum industry through the provision of acreage for exploration, which is promoted nationally and internationally. Updates are provided on recent upstream developments and government initiatives. Present and future policy directions that relate to onshore petroleum exploration are described, particularly for jurisdictions that are not making land available this year. When the APPEA conference was last held in Perth, in 2014, the oil price and exploration outlook were very different from today. In 2016, the petroleum industry experienced the full impact of the downturn, with the price for oil reaching a low of under $27 USD/barrel (WTI) early in the year. Several companies departed the onshore, exploration was at a fifteen-year low and much acreage has been surrendered across Australia. However, 2017 is showing signs of improvement with oil prices in the mid-50s and some hope that the industry will turn the corner this year. Low levels of exploration activity may have implications for future domestic gas supplies, and rising gas prices are of concern to local manufacturing industries and consumers throughout Australia. However, this may present marketing opportunities for successful explorers.

The relative attractiveness of US LNG exports—is the threat to Australian projects real?

2015 ◽  
Vol 55 (2) ◽  
pp. 420
Author(s):  
Vivek Chandra
Keyword(s):  
Gulf Coast ◽  
Capital Expenditure ◽  
Low Cost ◽  
Market Price ◽  
Oil Prices ◽  
Unit Costs ◽  
Sales Contracts ◽  
The Us ◽  
Relative Attractiveness ◽  
High Feed

The competitiveness of Australian LNG projects against US projects has been a subject of much debate; however, as oil prices have fallen since mid-2014, the debate has shifted from the relative commercial terms of the LNG sales contracts to the relative cost of supply. Falling oil prices have decreased the price of LNG in the traditionally oil-linked price markets of Asia. A lower cost of LNG will increase the demand for gas, especially in the power generation sector. New gas supplies would be required to meet increased demand, but the new supply must be at a competitive cost. The market price will be set by the marginal cost of incremental supply. Legacy projects in Southeast Asia, the Middle East and Australia are unable to increase their volumes. The only other source of incremental supply that can profitably sell at these lower prices are new projects in the US Gulf Coast. Australian greenfield projects will not be able to sell at these prices as they suffer from high capital expenditure (capex), high feed gas prices and high operating costs. In contrast, US Gulf Coast LNG projects are being constructed at significantly lower unit costs, have access to massive low-cost shale gas volumes and will operate at low costs using standard technology. These projects are ideally placed to operate in the lower priced environment, irrespective of the LNG sales contracts’ commercial terms.

scholarly journals Effect of Image Fusion on Vegetation Index Quality—A Comparative Study from Gaofen-1, Gaofen-2, Gaofen-4, Landsat-8 OLI and MODIS Imagery

2020 ◽  
Vol 12 (10) ◽  
pp. 1550 ◽  
Author(s):  
Prakash Ghimire ◽  
Deng Lei ◽  
Nie Juan
Keyword(s):  
Image Fusion ◽  
Vegetation Index ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Spectral Response ◽  
Vegetation Indices ◽  
Landsat 8 ◽  
Landsat 8 Oli ◽  
Pass Filter ◽  
Modis Imagery

In recent years, the use of image fusion method has received increasing attention in remote sensing, vegetation cover changes, vegetation indices (VIs) mapping, etc. For making high-resolution and good quality (with low-cost) VI mapping from a fused image, its quality and underlying factors need to be identified properly. For example, same-sensor image fusion generally has a higher spatial resolution ratio (SRR) (1:3 to 1:5) but multi-sensor fusion has a lower SRR (1:8 to 1:10). In addition to SRR, there might be other factors affecting the fused vegetation index (FVI) result which have not been investigated in detail before. In this research, we used a strategy on image fusion and quality assessment to find the effect of image fusion for VI quality using Gaofen-1 (GF1), Gaofen-2 (GF2), Gaofen-4 (GF4), Landsat-8 OLI, and MODIS imagery with their panchromatic (PAN) and multispectral (MS) bands in low SRR (1:6 to 1:15). For this research, we acquired a total of nine images (4 PAN+5 MS) on the same (almost) date (GF1, GF2, GF4 and MODIS images were acquired on 2017/07/13 and the Landsat-8 OLI image was acquired on 2017/07/17). The results show that image fusion has the least impact on Green Normalized Vegetation Index (GNDVI) and Atmospherically Resistant Vegetation Index (ARVI) compared to other VIs. The quality of VI is mostly insensitive with image fusion except for the high-pass filter (HPF) algorithm. The subjective and objective quality evaluation shows that Gram-Schmidt (GS) fusion has the least impact on FVI quality, and with decreasing SRR, the FVI quality is decreasing at a slow rate. FVI quality varies with types image fusion algorithms and SRR along with spectral response function (SRF) and signal-to-noise ratio (SNR). However, the FVI quality seems good even for small SRR (1:6 to 1:15 or lower) as long as they have good SNR and minimum SRF effect. The findings of this study could be cost-effective and highly applicable for high-quality VI mapping even in small SRR (1:15 or even lower).

Legacy issues constrain Sudan's economic recovery

2015 ◽  
Keyword(s):  
Oil Prices ◽  
Oil Production ◽  
Economic Recovery ◽  
Content Type ◽  
South Sudanese ◽  
Oil Exports ◽  
Fiscal Revenue

Significance Khartoum has benefited from a fixed per-barrel transit fee given falling oil prices, but the Sudanese economy has yet to recover from the shock caused by South Sudan's secession in 2011. According to the IMF's latest review, Sudan at that point lost three quarters of its oil production, one-half of its fiscal revenue and two-thirds of its international payments capacity. While the economy has begun to stabilise, recovery is fragile. Impacts Khartoum benefits from the delay to transit fee renegotiation, but talks are likely to begin soon. This may provoke renewed confrontations over other issues, such as the border and claims about rebel support. However, a renewed suspension of South Sudanese oil exports would hurt Juba more than Khartoum.

scholarly journals Development of an Inexpensive Raindrop Size Spectrometer

2004 ◽  
Vol 21 (11) ◽  
pp. 1710-1717 ◽  
Author(s):  
William Henson ◽  
Geoff Austin ◽  
Harry Oudenhoven
Keyword(s):  
Drop Size ◽  
Low Cost ◽  
Weather Radar ◽  
Field Work ◽  
Radar Reflectivity ◽  
Quantitative Relation ◽  
Mountainous Terrain ◽  
Raindrop Size

Abstract The deployment of weather radar, notably in mountainous terrain with many microclimates, requires the use of several or even many drop size spectrometers to provide confidence in the quantitative relation between radar reflectivity and rainfall. While there are several different commercial disdrometers available they are all expensive, large, or fragile, which militates against multiple deployment in the field. The design brief was for a reasonably accurate and sensitive, low-cost and rugged disdrometer to support field work. A design based on piezoceramic disks normally used in hydrophones is described. Calibration and typical field results are presented.

Generation of high-resolution fuel model maps from discrete airborne laser scanner and Landsat-8 OLI: A low-cost and highly updated methodology for large areas

2016 ◽  
Vol 187 ◽  
pp. 267-280 ◽  
Author(s):  
Eva Marino ◽  
Pedro Ranz ◽  
José Luis Tomé ◽  
Miguel Ángel Noriega ◽  
Jessica Esteban ◽  
...  
Keyword(s):  
High Resolution ◽  
Low Cost ◽  
Laser Scanner ◽  
Landsat 8 ◽  
Landsat 8 Oli ◽  
Airborne Laser Scanner ◽  
Airborne Laser ◽  
Fuel Model
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