Optimization of shale gas reservoir evaluation and assessment of shale gas resources in the Oriente Basin in Ecuador

Zhang, Hong; Shi, Juntai; Li, Xiangfang

doi:10.1007/s12182-018-0273-7

Cited by 14 publications

(7 citation statements)

References 30 publications

(33 reference statements)

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“…According to studies by Akaha-Tse et al, (2020) on the fracturing potentials of organic-rich shales of the Anambra basin, they highlighted that, as a result of the near absence of permeability in shales, the fluid content of a shale sequence can only be released under certain conditions. These conditions include those of Zhang et al, (2018) which highlight that the permeability of the shales should be at least greater than 100mD while porosity should be greater than 2%. Comparing the results of this research to Zhang et al, (2018) criteria, it could be seen that the shale sequence may have not created enough conditions in terms of quality to contain any early emplacement of hydrocarbon.…”

Section: Resultsmentioning

confidence: 99%

“…These conditions include those of Zhang et al, (2018) which highlight that the permeability of the shales should be at least greater than 100mD while porosity should be greater than 2%. Comparing the results of this research to Zhang et al, (2018) criteria, it could be seen that the shale sequence may have not created enough conditions in terms of quality to contain any early emplacement of hydrocarbon. In addition, results of the X-ray diffraction (XRD) analysis showed that the bulk mineralogical composition of the shales comprised quartz, rutile, gypsum, clay minerals and feldspar minerals while the estimated pore pressures ranged from 42.13 -47.62psi and the average in shale was 47psi (Table 3).…”

Section: Resultsmentioning

confidence: 99%

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Assessment of Sealing Potential of Fault-Bounded Hydrocarbon Prospect in Gabo Field, Niger Delta, Nigeria

Iheaturu,

Abrakasa,

Jones

et al. 2024

jasem

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Sealing potentials of faults are an important exploration risk to consider in the assessment of fault-bounded hydrocarbon prospects. This technique has been used for predicting potential hydrocarbon columns for mitigating risk in exploration and appraisals. Hence, the objective of the paper is to assess the sealing potential of the fault-bounded hydrocarbon prospects of the Gabo Field in the Niger Delta basin using seismic, well-log, and X-ray diffraction data. Three faults were interpreted as normal and syn-depositional faults. The well-log correlation showed that the shale sequence was inter-bedded with sands and showed a good spread with a relative thickness ranging between 12-105m from shallow to intermediate depth intervals. Results of the rock property analysis showed that the volume of shale ranged from 18 – 73.72% with an average of 63.59%. The total porosity ranged from 15.9 – 31.7 (good to excellent) with an average of 16.7 (good) in the shales and 27.2 (very good) in the sand. The effective porosity of the field ranged from 3.58 – 22.71 with an average of 6.028 in the shales and 20.13 in the sand. The estimated pore pressure ranged from 42.13 – 47.62psi with an average of 47.0psi in the shales and 42.8psi in the sand. The results of the X-ray diffraction analysis showed that the predominant minerals were kaolinite, rutile, gypsum, albite, microcline and quartz, which constitute the caprock sequence and the faulted rocks. Results of the sealing potential showed poor sealing in the shale sequence while the fault analysis showed good sealing along the fault planes. These results deduced the sealing uncertainty of the field and may be applied to similar siliciclastic trap configurations in deltaic environments.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Assessment of Sealing Potential of Fault-Bounded Hydrocarbon Prospect in Gabo Field, Niger Delta, Nigeria

Iheaturu,

Abrakasa,

Jones

et al. 2024

jasem

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“…First, Lu et al [49] studied the relationship between S1 and TOC of the mature source rocks in the Qingshankou Formation in the southern Songliao Basin and recommended that TOC ≥ 2.0% be used as the lower limit for hydrocarbon accumulation. Second, in 2011, Zhang [50] set the lower limit of TOC in the core area of marine shale gas to 2.0% based on the TOC and Ro of shale taking into account various factors, such as the distribution conditions and preservation conditions. Third, the experimental data on the TOC and hydrogen index of shales in the First Member of the Qingshankou Formation in the northern Songliao Basin (Fig.…”

Section: Pure Shale Oilmentioning

confidence: 99%

Classification and potential of continental shale oil resources in China and resource evaluation methods and criteria

Mi,

Guo,

Zhang

et al. 2023

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Continental shale oil resource is an important alternative source for increasing and stabilizing China's crude oil production. China has abundant continental shale oil resources. The opinions of researchers are divided over the classification of shale oil resources in China, resource evaluation methods and criteria, and resource potential prediction. Considering this fact, the authors of this article first summarized and analyzed the exploration progresses made in the typical shale oil exploration areas in China and the geological insights gained through exploration activities. Then, based on the current shale oil research status and actual oil production conditions in China, shale oil resources were classified into three types: interlayer shale oil, pure shale oil, and in-situ converted shale oil. Furthermore, the corresponding resource evaluation methods and quantitative models were proposed, the key parameters and their lower limits were determined and the resources of the three major types of shale oil in the shale formations in China's major basins were evaluated using a set of unified evaluation criteria. The in-place resources of pure shale oil, interlayer shale oil and in-situ converted shale oil are 145.4 × 10 8 t, 95.1 × 10 8 t and 708.2 × 10 8 t, respectively, and the recoverable resources are respectively 9.4 × 10 8 t, 7.1 × 10 8 t and 460.3 × 10 8 t. The research results can provide guidance for the evaluation of shale oil resources in China and the exploration planning for such resources and serve as valuable references for international peers to understand China's current status of research and development potential of shale oil.

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“…The Oriente Basin is located in the transition zone between the active Cordillera mountain system of South America and the stable Gondwana shield (Zhang et al, 2018;Ma et al, 2020). It is located in the northeast of Ecuador, has a north-south trend, and is steep in the west and gentle in the east.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fine grained sand and shale sedimentary characteristics in estuary based on sediment dynamics

Zhang

Hu²,

Wu³

et al. 2023

Front. Earth Sci.

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Due to the dual effects of fluvial and tides, the tidal sand bars in estuaries have complex sedimentary characteristics and complex internal structures, making them difficult to predict and describe. In this paper, the sedimentary dynamics numerical simulation method is used to establish a tidal-controlled estuary model. The effects of tidal range and sediment grain size on tidal sand bars are simulated. The length, width, and thickness of tidal sand bars, as well as the length and thickness of the internal shale layer, are also analyzed. The results show that in the environment of a tide-controlled estuary, the tidal range has a more significant effect on tidal sand bars compared to the sediment grain size under the specific conditions used in this study. The main effect of tidal range on tidal sand bars is that the greater the tidal range, the greater the length-to-width ratio of the sandbank, and the higher the degree of sandbank development. In a tidal-controlled estuary environment, the formation and distribution of shale layer structures are also affected by tides: the length of the shale layer increases as the tidal energy increases, but the changes in the thickness are not obvious. Numerical simulations of the development and distribution of the tidal sand bars and shale layers in estuaries based on sedimentary dynamics will provide a basis for the sedimentary evolution of tide-controlled estuaries and will provide guidance for the exploration and development of tidal estuaries.

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Optimization of shale gas reservoir evaluation and assessment of shale gas resources in the Oriente Basin in Ecuador

Cited by 14 publications

References 30 publications

Assessment of Sealing Potential of Fault-Bounded Hydrocarbon Prospect in Gabo Field, Niger Delta, Nigeria

Assessment of Sealing Potential of Fault-Bounded Hydrocarbon Prospect in Gabo Field, Niger Delta, Nigeria

Classification and potential of continental shale oil resources in China and resource evaluation methods and criteria

Analysis of fine grained sand and shale sedimentary characteristics in estuary based on sediment dynamics

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