Quantitative evaluation of fault-caprock sealing capacity: A case from Dabei-Kelasu structural belt in Kuqa Depression, Tarim Basin, NW China

Fu, Xiaofei; Jia, Ru; Wang, Haixue; Wu, Tonghao; Meng, Lingdong; Sun, Yonghe

doi:10.1016/s1876-3804(15)30023-9

Cited by 41 publications

(12 citation statements)

References 19 publications

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“…This may be due to the fact that the reservoir was reformed by densely developed faults. The fault will create dense fracture zones in the surrounding rock near the fracture section, which will significantly improve the permeability of the reservoir (Fu et al, 2015). Image-log data show obvious fracture development traces in the WC reservoir in the C-4-1d well (Fig.…”

Section: Characteristics Of Reformed Oil and Gas Accumulations In C-hdfmentioning

confidence: 99%

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Pang

Zhang

et al. 2022

Adv. Geo-Energy Res.

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Significant breakthroughs have been achieved in the exploration of Paleogene reservoirs in the Lufeng Depression. However, as drilling depth is becoming greater, the discovered oil and gas reservoirs show signs of transition from conventional to unconventional accumulations, and the identification of conventional and unconventional reservoir boundaries is of particular significance. Herein, the hydrocarbon dynamic field boundaries in the Lufeng Depression are comprehensively identified by the geological drilling result method, the sandstone pore throat radius critical value discrimination method and the dry layer drilling rate variation method; then, the hydrocarbon dynamic field is divided and the characteristics and differences of hydrocarbon accumulations in each hydrocarbon dynamic field are compared. The results show that the buoyancy-driven hydrocarbon accumulation depth in the Lufeng Depression is between 3,500-4,000 m, and the hydrocarbon accumulation depth limit is about 5,800 m. The focus of research on Paleogene oil and gas exploration in the Lufeng Depression should be placed on conventional oil and gas reservoirs in the free dynamic field and tight oil reservoirs in the reformed dynamic field. As for the Enping Formation and Upper Wenchang Formation, efforts should concentrate on conventional oil and gas reservoir exploration, and the tight reservoir of Lower Wenchang Formation should be explored in the high fracture density area in C-4 and C-8 well blocks and the west of C-8 well block of the Lufeng 13 sag. The research results of this paper are of great value in further increasing oil and gas production and the explorarion of sreserves in the Lufeng Depression.

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Section: Characteristics Of Reformed Oil and Gas Accumulations In C-hdfmentioning

confidence: 99%

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Pang

Zhang

et al. 2022

Adv. Geo-Energy Res.

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“…The sealing effect of a caprock-fault system for CO 2 -EOR storage depends mainly on the sealing ability of the caprocks and faults [29]. The sealing mechanisms for CO 2 storage are similar to that for hydrocarbons and include the capillary sealing mechanism, overpressure sealing mechanism, concentration sealing mechanism, and synergetic sealing mechanism composed of two or more sealing mechanisms [21].…”

Section: Indicator System and Evaluationmentioning

confidence: 99%

“…The petrophysical properties of fault rocks are affected by many factors, the most important of which involve geostresses, subsurface temperatures, and their historical tendencies. Occasionally, these factors or their derived parameters have been selected as evaluation indicators of fault sealing properties, and they typically include differential displacement pressures between the caprock and the reservoir [34], the slip and offset of the formation lithology [29], and the fault tightness coefficient [35]. In many practical evaluations, the vertical and lateral sealing properties of faults might have different roles in specific projects and must be evaluated separately [36].…”

Section: Indicator System and Evaluationmentioning

confidence: 99%

Evaluating the Sealing Effectiveness of a Caprock-Fault System for CO₂-EOR Storage: A Case Study of the Shengli Oilfield

Bai

et al. 2017

Geofluids

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An effective sealing system is crucial for CO 2 -EOR storage, and these sealing systems are typically composed of the caprocks and faults that surround a reservoir. Therefore, the sealing effectiveness of a caprock-fault system must be evaluated at various stages of CO 2 -EOR storage projects. This paper presents a new evaluation framework that considers specific site characteristics and a case study on the sealing effectiveness of the caprock-fault system in the Shengli Oilfield. The proposed method is a weighted ranking system where a set of 17 indicators has been developed for the assessment and ranking of the G89 block in terms of their sealing ability for CO 2 sequestration. Additional indicators are involved in the method, such as the newly proposed parameter, frontier displacement work which reflects the influence of formation pressure, displacement pressure resistance, and caprock thickness. The new approach considers the sealing mechanisms of caprocks and faults as well as the configuration relationships between them. The method was used to evaluate the sealing effectiveness of the G89 block that has a considerable number of faults and good sealing ability of caprock in the Shengli Oilfield.

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“…The generation of cracks is related to the caprock's brittleness that is characterized by its mechanical properties. Many scholars have noticed the change of brittleness and ductility of mudstone for a long time, and carried out many experiments on mudstone rock mechanics, and defined the evaluation criteria of mudstone brittleness by using different parameters, but there are few studies specifically on mudstone caprock of gas storage [4,16,17]. From the microscopic perspective, porosity, permeability, pore size distribution, specific surface area, and displacement pressure are the main parameters to reflect the microscopic sealing capacity of caprock, among which displacement pressure is widely regarded as the most fundamental parameter that reflects the sealing capacity of caprock [8,13,14,18].…”

Section: Introductionmentioning

confidence: 99%

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

Jia

Wen

et al. 2022

Energies

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The evaluation of caprocks’ sealing capacity is exceedingly important for depleted gas reservoirs to be reconstructed into gas storage. In this paper, based on the physical sealing mechanism of caprock, four aspects of ten indexes of caprock quality evaluation were firstly selected, and the related classification standards were established. Secondly, based on the rock mechanical sealing mechanism, elastic and plastic indexes were selected to characterize the mechanical brittleness of caprock, and a brittleness evaluation method of caprock based on complete stress-strain curves was established. Then, a systematic comprehensive evaluation model (including 5 aspects and 12 evaluation indexes) for the sealing capacity of gas storage caprock was proposed, and the analytic hierarchy process (AHP) was used to determine the weight of the 12 indexes in the evaluation model, and the formula for calculating the suitability of the caprock sealing capacity was established. Finally, the geological data, laboratory, and field test data, including X-ray diffraction, poro-permeability test, displacement pressure, and tri-axial compression test, were used for the caprock sealing capacity evaluation of the X9 depleted gas reservoir, and the result from this model showed that the caprock quality is suitable for underground gas storage.

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Quantitative evaluation of fault-caprock sealing capacity: A case from Dabei-Kelasu structural belt in Kuqa Depression, Tarim Basin, NW China

Cited by 41 publications

References 19 publications

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Evaluating the Sealing Effectiveness of a Caprock-Fault System for CO₂-EOR Storage: A Case Study of the Shengli Oilfield

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

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Quantitative evaluation of fault-caprock sealing capacity: A case from Dabei-Kelasu structural belt in Kuqa Depression, Tarim Basin, NW China

Cited by 41 publications

References 19 publications

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Hydrocarbon dynamic ﬁeld division and its relevance to oil and gas exploration for Paleogene reservoir in Lufeng Depression

Evaluating the Sealing Effectiveness of a Caprock-Fault System for CO2-EOR Storage: A Case Study of the Shengli Oilfield

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

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Evaluating the Sealing Effectiveness of a Caprock-Fault System for CO₂-EOR Storage: A Case Study of the Shengli Oilfield