Sedimentary Provenance Analysis of Palaeocene in the X Sag, East China Sea Shelf Basin
Zhongqiang Sun,
Zhihao Chen,
Guangao Zhong,
Wenlong Shen,
Zhang Jinliang,
Longlong Liu
Issue:
Volume 9, Issue 6, November 2021
Pages:
83-92
Received:
31 October 2021
Accepted:
16 November 2021
Published:
23 November 2021
Abstract: The analysis of sedimentary provenance characteristics is the premise of sedimentary system analysis. At present, the understanding of sedimentary provenance is not unified in the exploration and development of Lishui Sag. To solve this problem, in this paper, we used the clastic components composition and the major element oxides to analyze the tectonic setting in provenance area, the analysis of paleogeomorphology, heavy minerals, mudstone color index and paleocurrent indicated by seismic reflection characteristics were used to analyze the provenance direction. Through the analysis of clastic components composition, it is considered that the provenance of Paleocene sedimentary system in the X sag mainly comes from the areas of Recycled Orogenic, Dissected Arc and Transitional Arc, and the analysis of major element oxides shows that the provenance tectonic setting and type of Paleocene sedimentary system in the X sag is mainly active continental margin and island arc, these two conclusions are basically consistent. The paleogeomorphology, heavy minerals, mudstone color index and seismic reflection characteristics analysis shows that the provenance direction in the sedimentary period mainly comes from the west, southwest of Minzhe Uplift and East of Yandang Uplift. Different provenance areas provide substantial sediments basis for the development of sedimentary facies in the study area.
Abstract: The analysis of sedimentary provenance characteristics is the premise of sedimentary system analysis. At present, the understanding of sedimentary provenance is not unified in the exploration and development of Lishui Sag. To solve this problem, in this paper, we used the clastic components composition and the major element oxides to analyze the te...
Show More
A New Method for Obtaining Irreductive Water Saturation and Other Parameters
Yang Kebing,
Liu Huan,
Wang Lei,
Huang Zhongneng,
Bai Xinguo
Issue:
Volume 9, Issue 6, November 2021
Pages:
93-97
Received:
26 November 2021
Accepted:
11 December 2021
Published:
24 December 2021
Abstract: The results show that the resistivity and water saturation data from a core obtained by core electrical experiments are power functions, which can reflect the conductivity characteristics of pore water in rock. Further research shows that when the resistivity data of power function shows a gentle change trend, it shows that the change of movable water pores affects the resistivity data, and when the resistivity data shows a drastic change trend, it shows that the irreducible water conductivity plays a leading role. Therefore, parameters such as irreducible water saturation and movable oil saturation can be determined from the morphological changes of the curve, just as the porosity lower limit of rocks can be determined. Compared with the irreducible water saturation data obtained by mercury injection and other data, a new method is proposed to determine the irreducible water saturation of a core by the cutoff value of slope of power function curve, and the movable oil saturation can be determined by the maximum curvature value of power function curve, which can further obtain the residual oil saturation. The preliminary application shows that the absolute error of irreducible water saturation and other parameters is within 5% and can be used in practice.
Abstract: The results show that the resistivity and water saturation data from a core obtained by core electrical experiments are power functions, which can reflect the conductivity characteristics of pore water in rock. Further research shows that when the resistivity data of power function shows a gentle change trend, it shows that the change of movable wa...
Show More
Evaluation of the Economic Potentials of a Mini Gas-to-Liquids (GTL) Plant in Nigeria
Ubanozie Julian Obibuike,
Stanley Toochukwu Ekwueme,
Chinelo Iruamaka Abanobi,
Remmy Chindu Eluagu,
Anthony Chemazu Igbojionu
Issue:
Volume 9, Issue 6, November 2021
Pages:
98-110
Received:
11 November 2021
Accepted:
3 December 2021
Published:
29 December 2021
Abstract: In this paper, the economic potential of using a mini gas-to-liquids (GTL) plant for monetization of stranded associated gas in Nigeria was extensively evaluated. Feedstock to the plant comprises 50 MMscfd of treated stranded associated gas from Assa North in the Niger Delta region of Nigeria. 5000 b/d of GTL diesel product was realized after simulation using Fischer-Tropsch (FT) type modular gas-to-liquids technology. Economic analyses were performed for a wide range of economic conditions to determine the economic potentials of the GTL project. From the result, it was realized that for base case, the net present value (NPV) of the project was US$32,421 barrel-liquid-per-day (BLPD) corresponding to US$162.1 million for 5000 b/d of GTL diesel produced. The payout time (POT) was 4.48 years while the net cash ratio (NCR) was US$81.83 million. The internal rate of return (IRR) was 22.2%. From the sensitivity analyses performed, it was realized that the variable having the most influence on the NPV was the GTL product price (the price of diesel) followed by the capital cost of the GTL plant and then the natural gas price. It was also realized that the operating cost of the plant has the least (negligible) effect on the NPV of the project. Furthermore, it was realized that GTL project remained profitable for diesel prices above US$80/bbl as long as the price of natural gas was maintained below US$2.2/Mscf at 15% discount rates. In general, it was realized that the mini-GTL project was profitable for diesel prices equal to or greater than US$80/bbl as long as discount rates remained below 20% for base CAPEX and OPEX. It was recommended that the government of Nigeria subsidizes the price of natural gas to increase the profitability of mini-GTL projects creating a greater participation by the private investors and thereby reducing the volume of associated gas flared.
Abstract: In this paper, the economic potential of using a mini gas-to-liquids (GTL) plant for monetization of stranded associated gas in Nigeria was extensively evaluated. Feedstock to the plant comprises 50 MMscfd of treated stranded associated gas from Assa North in the Niger Delta region of Nigeria. 5000 b/d of GTL diesel product was realized after simul...
Show More
