scholarly journals Investigation of geophysical challenges in land seismic data acquisition in Nigeria: case study of parts of the Niger Delta region

2021 ◽  
Vol 11 (2) ◽  
pp. 587-599
Author(s):  
C. N. Onwubuariri ◽  
L. S. Al-Naimi ◽  
B. I. Ijeh ◽  
T. I. Mgbeojedo ◽  
M. U. Igboekwe ◽  
...  
Keyword(s):  
Seismic Data ◽  
Niger Delta ◽  
Weather Conditions ◽  
Seismic Exploration ◽  
Noise Interference ◽  
Niger Delta Region ◽  
Cloudy Weather ◽  
Seismic Acquisition ◽  
Seismic Data Acquisition

AbstractGeophysical analysis was carried out to evaluate the challenges encountered in land seismic exploration within the study area. This analysis cuts across various stages in land seismic acquisition. These stages include the following: the availability of the prospect map as originally planned by the prospect owners—the client, the desk study and planning of this map by the seismology section (planning seismologist) for acquisition convenience and the field implementation of the acquisition which the survey, drill and recording (preloading, shooting, swath move, line check, LAUX crew and recording platform) sections carried out. The challenges observed included environmental challenges, noise interference, weather conditions (statics or electrostatics interference), line break, faulty equipment, wrong detailing, cake or expired explosives, poor or compromised supervision, security and permit challenges. These challenges are peculiar to Nigeria due to inadequate implementation of policies that guide human settlements and activities. Nigeria is within the climate region where most at times it is very impossible to control natural events like cloudy weather, rainfall, thundering and lightening. As such, the problem of static charges interfering with acquired seismic data becomes inevitable, mostly during the rainy season. Almost total dependency on imported technology and lack of readily available experienced manpower also contribute to these challenges, most especially when it has to do with proper inspection of equipment and materials required for the acquisition and supervision processes. Approaches to follow to minimize the observed challenges were equally highlighted.

Trends in onshore seismic data acquisition: a case study on cable-free nodal systems

2016 ◽  
Vol 56 (2) ◽  
pp. 601
Author(s):  
Nabeel Yassi
Keyword(s):  
Data Quality ◽  
Data Acquisition ◽  
Seismic Data ◽  
Seismic Exploration ◽  
Quality Data ◽  
Seismic Surveys ◽  
The Past ◽  
Seismic Data Acquisition ◽  
2D And 3D

The desire to conduct onshore seismic surveys without cables has been an elusive dream since the dawn of seismic exploration. Since the late 1970s, seismic surveys were conducted with cabled multi-channels acquisition systems. As the number of channels steadily grew, a fundamental restriction appeared with hundreds of kilometres of line cables dragged on the ground. Seismic surveys within rugged terrain—across rivers, steep cliffs, urban areas, and culturally and environmentally sensitive zones—were both challenging and expansive exercises. Modern technology has made different cable-free solutions practical. High-resolution analogue to digital converters are now affordable, as are GPS radios for timing and location. Microprocessors and memory are readily available for autonomous recording systems, along with a battery the size and weight of a field nodal now promising to power an acquisition unit for as long as required for normal seismic crew operations. Many successful 2D and 3D seismic data acquisition using cable-free autonomous nodal systems were attempted in the past few years; however, there remain a number of concerns with these systems. The first concern queries whether the units are working according to manufacturer specifications during the data acquisition window. The second is the limited or no real-time data quality control that inspires sceptics to use the term blind acquisition to nodal operations. The third is the traditional question of geophone array versus point receiver acquisition. Although a string of the geophone can be connected to autonomous nodes, the preference is to deploy a single or internal geophone with the nodes to maintain the proposed flexibility of cable-free recording systems. This case study elaborates on the benefits of the cable-free seismic surveys, with specific examples of 2D and 3D exploration programs conducted in Australia in the past few years. Optimisation of field crew size, field crew resources, cost implications, and footprint to the environment, wildlife and domestic livestock will be discussed. In addition, the study focuses on the data quality/data assurance and the processes implanted during data acquisition to maintain equivalent industry standards to cable recording. Emphases will also include data analysis and test results of the geophone array versus the cable-free point receiver recording.

Compressive seismic data acquisition in a desert area of western China: A case study

2020 ◽  
Vol 39 (5) ◽  
pp. 340-344
Author(s):  
Guoxu Shu ◽  
Taikun Shi ◽  
Liang Huang ◽  
Zhenghui Gao ◽  
Gonghe Lv ◽  
...  
Keyword(s):  
Seismic Data ◽  
Western China ◽  
Seismic Exploration ◽  
Data Reconstruction ◽  
Desert Area ◽  
Data Set ◽  
Imaging Quality ◽  
Seismic Data Acquisition ◽  
Legacy Data

The seismic exploration industry continuously demands better imaging quality and consequently requires denser spatial sampling, which increases acquisition cost and time. To alleviate this burden, compressive sensing (CS) theory has been introduced in the design of acquisition geometry, as it requires fewer shot and receiver locations than traditional methods. In 2017, we conducted a field experiment in a desert area in western China. This was the first such test in China to utilize CS theory in a field test. The survey had 1760 shot records with irregular shot and receiver locations designed with guidance from CS theory. By way of data reconstruction, a seismic data set with higher sampling density (7.5 × 7.5 m bin size) was acquired, and the imaging quality was improved significantly compared to existing legacy data (15 × 15 m bin size). These results indicate that a CS-designed acquisition may reduce cost while enhancing imaging quality.

scholarly journals Resource Based Conflict and Climate Change in the Niger Delta Region, Nigeria

2021 ◽  
pp. 206-216
Author(s):  
Eziho Promise Ogele
Keyword(s):  
Climate Change ◽  
Greenhouse Gas ◽  
Niger Delta ◽  
Greenhouse Gas Emission ◽  
Weather Conditions ◽  
Local Economy ◽  
Delta Region ◽  
Gas Emission ◽  
Oil Companies ◽  
Niger Delta Region

The study examined the effects of climate change on the local economy occasioned by resource-based conflict in the Niger Delta region, Nigeria. The alteration in weather conditions in the Niger Delta region is associated with anthropogenic activities of the transnational oil companies for over five decades in the Niger Delta region, Nigeria. Despite the degree of oil exploration and exploitation, the Niger Delta region remained underdeveloped in social amenities. The inhabitants were deprived and alienated from the Petrodollar benefits. The launching of artisanal refining by the locals as a way of getting from Petro Dollar business became inevitable. These activities have increased greenhouse gas emission leading to the alteration in weather conditions in the Region Sadly, the Joint Military Task Force deployed to monitor and arrest culprit bombard and burn down the artisanal refining equipment unprofessionally, thereby increasing greenhouse gas emission into the atmosphere. Given the above, the Niger Delta inhabitants are experiencing alteration in weather condition leading to poor agricultural harvest.  The study adopted Frustration/Aggression theoretical as its framework. The study relied on primary through questionnaires and interview, while secondary sources data was through journals, books, newspapers, among others. The study unraveled that resource-based conflict occasioned deprivation and frustration increased greenhouse gas emission. The study recommends amongst others convening a climate change summit that will involve all the stakeholders in the oil activities in the Region.

STRATEGIES FOR MANAGING OIL SPILL RELATED CONFLICTS IN THE NIGER DELTA: A CASE STUDY OF BAYELSA STATE

2021 ◽  
Vol 8 (4) ◽  
pp. 465-483
Author(s):  
Ndidiamaka Chijioke ◽  
Susan Audu-Bako ◽  
Ikechukwu Uwakwe
Keyword(s):  
Crude Oil ◽  
Oil Spill ◽  
Niger Delta ◽  
Local Governments ◽  
Oil Exploration ◽  
Delta Region ◽  
Oil Companies ◽  
Niger Delta Region ◽  
Exploration Activity

The discovery of crude oil in Oloibiri-a town in the present Bayelsa state, Niger-Delta region of Nigeria) in 1956 and the subsequent exploration activities have over the years impacted tremendously not only on the ecosystem and livelihood pattern of the Niger Delta but on the pattern of conflicts that has trended.. While resources accruable to Nigeria from sale of crude oil are shared by all, the impacts of oil spill an offshoot of crude oil exploration activities are borne solely by the Niger Delta region. Oil spill appears to have found a permanent abode in Bayelsa state; from Southern Ijaw to Sagbama local governments, Olodiama to Azuzuama communities. Local communities are faced with the problem of continuous oil spill. This in turn has brought about conflicts between oil bearing communities and oil companies. These conflicts in some instances led to shut down of operations of oil companies, vandalism, and reduction of Nigeria’s crude export. In view of the illustrated background, this study examined the strategies for management of oil spill related conflicts in Bayelsa state regarding that oil spill is a key impact of crude oil exploration activity. Findings revealed that the strategies deployed in the management of oil spill in the state can be categorised into three: community strategies, regulators and non-governmental organisations strategies.

Mangrove Restoration and Conservation as a Carbon Offset Option: A Case Study in the Niger Delta Region

2021 ◽  
Author(s):  
Gustavo Calderucio Duque Estrada ◽  
Jason Sali ◽  
Patrizio Piras ◽  
Norbert Jallais ◽  
Uchechukwu Amaechi ◽  
...  
Keyword(s):  
Soil Contamination ◽  
Niger Delta ◽  
Carbon Stock ◽  
Ghg Emissions ◽  
Local Communities ◽  
Residual Soil ◽  
Delta Region ◽  
Niger Delta Region ◽  
Carbon Offset

Abstract Despite their limited global distribution, mangroves have gained attention as a potential carbon offset option due to their high carbon storage capacity and diverse social and environmental co-benefits. Carbon stock in mangroves (global average=2,790tCO2eq/ha) is about four times higher than in terrestrial forests and contributes to almost 10% (37GtCO2eq) of global terrestrial carbon pool. Mangrove carbon sequestration averages 6.9tCO2eq/ha/yr but may reach more than 20tCO2eq/ha/yr. Literature suggests that over 812,000ha of mangrove areas, spread over 106 countries/territories, show potential for restoration. Furthermore, globally, mangroves have been lost at a rate of 1-2%/yr, which may account for an annual emission of about 0.09-0.45 GtCO2eq/yr that can be potentially avoided through conservation actions. Mangroves within the Niger Delta Region (NDR) cover 800,000ha (6% of world extent), and contain an estimated carbon stock of 2.2GtCO2eq. In 2017, Eni's subsidiary Nigerian Agip Oil Company (NAOC) launched a voluntary initiative to restore mangroves to promote social and biodiversity benefits while also contributing to offsetting its GHG emissions. A 30-ha pilot restoration area was identified in Okoroma, Bayelsa, where mangroves had failed to naturally recover from oil spills caused by third party interference in 2014. Site assessments were carried out in 2018 and indicated residual soil contamination (hydrocarbons/metals) and low fertility, a typical characteristic of soils in the NDR. A restoration trial (n=90 seedlings) using nursery-reared seedlings resulted in 100% survivorship and high growth rates, confirming the feasibility of active restoration across the entire site. Although soil contamination was lower than when the spills occurred, we concluded that the combination of residual contamination, low soil fertility and site topography had restricted the natural regeneration process. This in turn risked further soil degradation and ultimately erosion and permanent habitat loss. To prevent this from happening, a long-term restoration program based on the transplantation of fertilized seedlings in partnership with local communities is proposed. In addition to the benefits to the local communities and the environmental restoration, this project is expected to allow for the sequestration of 2,970tCO2eq in 20 years and avoid the emission of an estimated 60,000tCO2eq from soil carbon, numbers that could be scaled up in the future to a much larger area. The results of this case study further confirm the possibility of using mangroves as a Natural Climate Solution to offset GHG emissions from O&G operations.

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