The formation and architecture of Penglai granite intrusion reservoir along the Tanlu strike-slip fault: Implications for basement exploration in the offshore Bohai Bay Basin, North China

Tao, Ye; Sun, Shi; Chen, Anqing; Niu, Chengming; Luo, Jian; Hou, Mingcai

doi:10.1016/j.egyr.2022.12.060

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…Porosity and P 10 fracture density of subsurface crystalline rocks from the Bach Ho field in the Cuu Long Basin in Vietnam ranged from 0% to 3% and 5 to 40 fractures/m, respectively (Cuong & Warren, 2009; Yao et al, 2020, 2021; Ye et al, 2023), whereas those in the Penglai field in the Bohai Bay Basin in China exhibit porosity ranging from 0.02% to 11% and reports a fracture density of four fractures/m. These ranges of fracture density and porosity include the values obtained from outcrops of UMB (Figure 10).…”

Section: Discussionmentioning

confidence: 99%

“…Permeability data from the subsurface are less available than those for the porosity. In the Penglai and Bach Ho fields, permeability tends to be less than 1000 mD in poor fracture core‐plug samples and well logging (Cuong & Warren, 2009; Ye et al, 2023). In contrast, the permeability values obtained from outcrops of the basement of UMB are up to three orders of magnitude higher (Figure 10).…”

Section: Discussionmentioning

confidence: 99%

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Fracture evaluation of the plutonic basement in the Upper Magdalena Basin: Implications for the development of naturally fractured reservoirs in the Northern Andes

Rodríguez‐Cuevas,

Cardona,

Monsalve

et al. 2024

Geological Journal

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Plutonic rocks typically have negligible matrix porosity and permeability. However, fractures and mineral alterations create storage space and flow pathways that turn plutonic rocks into fluid reservoirs. Despite significant hydrocarbon discoveries, naturally fractured reservoirs in plutonic rocks have been poorly studied. In most Colombian basins, the crystalline basement has undergone multiple deformational events and is thrust over the Cretaceous to Cenozoic source and reservoir rocks of the conventional petroleum system. This structural configuration is ideal for the migration of oil into a fractured basement. A multiscale fracture analysis, including field, petrographical and petrophysical techniques was conducted on the Permian and Jurassic plutonic basement of Upper Magdalena Basin in order to understand the controls on brittle deformation, the development of fracture networks and their potential to form hydrocarbon reservoirs. The results indicate that protolith textures and structures, including magmatic and mylonitic foliation, favours fracturing. Dykes exhibit higher fracture density (7–48 fractures/m), porosity (mean = 0.4%) and permeability (mean = 125,818.75 mD) than the host rock (2–25 fractures/m; 0.23%; 12,066.09 mD). Intersection zones from regional faults, are characterized by the highest fracture and lineament intensity. Our results suggest that dyke swarms and interacting damage zones can significantly enhance the reservoir quality of plutonic rocks by providing storage in fractures and fluid pathways to the host rock.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fracture evaluation of the plutonic basement in the Upper Magdalena Basin: Implications for the development of naturally fractured reservoirs in the Northern Andes

Rodríguez‐Cuevas,

Cardona,

Monsalve

et al. 2024

Geological Journal

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“…Moreover, the formation of weathering crust differs in different areas. For example, some studies propose that mechanical breakdown and chemical weathering play crucial roles in the formation of granite reservoirs [16,20], while other studies suggest that the top of altered granite contributes little to oil and gas production and fracture layers related to the decompression of granitic batholith or/and large deep faults are the main storage spaces [5,23,24]. and Wei et al (2018) emphasized the influence of topography on the preservation and differential evolution of weathering crust reservoirs [25,26].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Genetic Mechanism of Granite Weathering Crust of Songnan Low Uplift, Qiongdongnan Basin, South China Sea

Li,

Guo,

2024

Minerals

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Recently, a large-scale gas reservoir was discovered in granitic buried hills of the Songnan Low Uplift in the Qiongdongnan Basin. However, the strong heterogeneity of granite reservoirs limits further exploration and evaluation. Based on observations of sixty core samples and sixty thin sections, mineral composition, zircon dating, apatite fission tracks, physical properties, image logs, outcrop surveys and seismic interpretations, the characteristics of granite weathering crust of the Songnan Low Uplift are analyzed, and its controlling factors and evolution process are evaluated. The results show that weathered granite in the study area can be divided into several zones, from top to bottom: eluvium–slope zone, sandy zone, weathered fracture zone and horizontal undercurrent vuggy zone. The reservoirs in the eluvium–slope zone are dominated by microfissures and intergranular dissolution pores and have an average porosity of 4.68% and permeability of 2.34 md; the reservoirs in the sandy zone are composed of intergranular and intragranular dissolution pores and have an average porosity of 11.46% and permeability of 4.99 md; the reservoirs in the weathered fracture zone consist of various fractures and have an average porosity of 3.91% and permeability of 2.5 md; the reservoirs in the horizontal undercurrent vuggy zone are subhorizontal fractures and vugs and have an average porosity of 2.7% and permeability of 0.23 md. The development of granite reservoirs is jointly influenced by petrology and minerals, long-term exposure in a warm humid paleoclimate, faults, diverse topographies and shallow buried depth. Based on the above, our study establishes a development model of weathering crust and suggests that only the gentle slope and platform remain strongly weathered zones. After undergoing a complex evolution process of formation–destruction/denudation–regeneration–preservation, the current weathering crust of the Songnan Low Uplift is finally established. The results of this study have important theoretical and application value for the hydrocarbon exploration of buried hills in the Qiongdongnan Basin and provide a reference example for other granite reservoirs worldwide.

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The formation and architecture of Penglai granite intrusion reservoir along the Tanlu strike-slip fault: Implications for basement exploration in the offshore Bohai Bay Basin, North China

Cited by 2 publications

References 35 publications

Fracture evaluation of the plutonic basement in the Upper Magdalena Basin: Implications for the development of naturally fractured reservoirs in the Northern Andes

Fracture evaluation of the plutonic basement in the Upper Magdalena Basin: Implications for the development of naturally fractured reservoirs in the Northern Andes

Characteristics and Genetic Mechanism of Granite Weathering Crust of Songnan Low Uplift, Qiongdongnan Basin, South China Sea

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