The reservoir characteristics and their significance for deliverability in metamorphic granite buried hill: a case study from the JZS oil field in the Liaodong Bay Basin, NE China

Ye, Tao; Wei, Ajuan; Sun, Zhe; Gao, Kunshun; Cheng, Qi

doi:10.1007/s12517-019-4823-0

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…Influenced by the resolution of 3D seismic data, it is difficult to identify the fractures in BZ, but seismic data reveals many internal faults developed in the granitic buried hill (Figure 11). It has been confirmed that the fractures inside the granitic buried hill are mostly related to faults in Bach Ho oilfield (Carvalho et al, 2013), and the internal fracture zone of JZS granitic buried hill is also response for internal‐faults (Ye et al, 2019). That is to say, for the cutting of faults in BZ, high‐quality reservoirs are still developed locally, which forms thick reservoir of granitic buried hill together with those of WZ upside.…”

Section: Discussionmentioning

confidence: 88%

“…Many studies have proved that not only surface atmospheric fresh water, but also tectonic activity controlled the weathering intensity (Ye et al, 2020; Ye, Wei, Sun, Gao, & Cheng, 2019). The outcrop in Liaoning and the cores in well PL2 all demonstrate the rule that the rocks where tectonic fractures more developed show stronger weathering intensity (Figure 8a,b).…”

Section: Discussionmentioning

confidence: 99%

“…During the weathering process, on the one hand, affected by the changing of temperature near the surface, weathered clay, weathered‐gravelly sandstone as well as a large number of inter‐granular pores formed in WZ (Li et al, 2009). On the other hand, the dissolution of feldspars by atmospheric water also lays a foundation for the development of dissolution pores (Ye et al, 2019). For the connectivity of the fractures deteriorates from the top to the bottom gradually, the weathering intensity decreases as well, which made the fractures in BZ less weathered and dissolved.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have proved that not only surface atmospheric fresh water, but also tectonic activity controlled the weathering intensity (Ye et al, 2020;Ye, Wei, Sun, Gao, & Cheng, 2019 (Figure 8a,b). Notably, the cores from PL2 indicate that the weathering start along with the weak zones where tectonic fractures developed firstly and then gradually extend to the surrounding areas (Figure 8b).…”

Section: F I G U R Ementioning

confidence: 99%

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Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China

Chen

Niu

et al. 2020

Geological Journal

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Primary pores are undeveloped in the granite, but multiple types of reservoir spaces can form during the processes of weathering and tectonic movement. Taking Penglai (PL) oil field as an example, the vertical zonal characteristic of the buried granite is defined and the relationship between different zones and reservoir is discussed. The granite can be divided into weathered zone (WZ) and bedrock zone (BZ) vertically according to weathered or not, and the WZ can be divided into weathered clay zone (WCZ), weathered glutenite zone (WGZ), and weathered fracture zone (WFZ) further. The lithology, mineral composition, and weathering indices (geochemistry) can distinguish different zones. Both WZ and BZ can form good reservoirs, among them the reservoir of WGZ is dominated by pores, while that of WFZ and the BZ are mainly composed of fractures, and they constitute the high-quality reservoir together. There is an obvious positive correlation between the thickness of fracture zone in BZ and the thickness of WZ, and both WZ and BZ are influenced by tectonic movement. Moreover, WZ superimposed with meteoric water dissolution makes it the best reservoir in the granitic buried hill, and the development of fractures in BZ extends the thickness of reservoir greatly.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Many studies have proved that not only surface atmospheric fresh water, but also tectonic activity controlled the weathering intensity (Ye et al, 2020;Ye, Wei, Sun, Gao, & Cheng, 2019 (Figure 8a,b). Notably, the cores from PL2 indicate that the weathering start along with the weak zones where tectonic fractures developed firstly and then gradually extend to the surrounding areas (Figure 8b).…”

Section: F I G U R Ementioning

confidence: 99%

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Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China

Chen

Niu

et al. 2020

Geological Journal

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“…Bedrock reservoirs have a wide distribution, occur in multiple types without compaction control and have large longitudinal extension characteristics (Nelson et al, 2000;Sruoga, et al, 2007;Wang et al, 2015;. This is an important area of oil and gas exploration, with large granite bedrock oil and gas fields having been discovered in Vietnam, Libya, Venezuela, India and the Bohai Basin of China, good development results having been obtained (Koning et al, 2003;Micarelli et al, 2006;Ma et al, 2006;Pan et al, 2007;Zhou et al, 2009;Nguyen et al, 2014;Huang et al, 2016;Ye et al, 2019), thus opening up a new field of buried hill oil and gas exploration. The large-scale granite bedrock oil and gas reservoirs so far discovered generally have the following characteristics: an excellent hydrocarbon source, a thick cap rock; a large-scale reservoir; many types of trap; and a good disposition of migration and accumulation relations (Luo et al, 2005;Cuong et al, 2009;Lu et al，2020).…”

Section: Introductionmentioning

confidence: 99%

Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep‐water of the Qiongdongnan Basin, Northern South China Sea

Shouli

Mao

et al. 2021

Acta Geologica Sinica (Eng)

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Due to its structure, rock and mineral composition, fluid and other factors, the granite Buried Hill Reservoir is highly heterogeneous with a complex longitudinal structure and a reservoir space made up of a combination of dissolution pores and fractures. This paper is based on current understanding of tectonic evolution in the northern part of the South China Sea, in conjunction with the seismic phase characteristics. It is determined that the meshed fault system was formed by three stages of movement-tectonic compression orogeny during the Indochinese epoch, strike-slip compression-tension during the Yanshanian Period, early fracture extension activation during the Himalayan-which controlled the distribution of the Buried Hill Reservoir. Drilling revealed two types of buried hills, faulted anticline and fault horst, their longitudinal structure and the reservoir space type being significantly different. The mineral composition, reservoir space and diagenetic characteristics of the reservoir rocks and minerals were analyzed by lithogeochemistry, microsection and logging etc., it thus being determined that the Mesozoic rocks of the Songnan Low Uplift in the Qiongdongnan Basin are mainly composed of syenogranite, granodiorite, monzogranite, which is the material basis for the development of the Buried Hill Reservoir. The content of felsic and other brittle minerals is more than 70%, making it easy for it to be transformed into fractures. At the same time, the weathering resistance of granodiorite and monzogranite is weaker than that of syenogranite, which is easily weathered and destroyed, forming a thick sand gravel weathering zone. With increasing depth of burial, weathering and dissolution gradually weaken, the deep acidic fluid improving the reservoir property of internal fractures and expanding the vertical distribution range of the reservoirs. The research results lay a foundation for the exploration of Buried Hill in the deep-water area of the Qiongdongnan Basin.

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Characteristics and formation mechanism of the fractures in Archaean buried hill: A case study in the BZ19‐6 Block, Bohai Bay Basin, China

Dai

Tang

Li³

et al. 2020

Geological Journal

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While Archean buried hill fractured reservoirs have been found for the first time in the BZ19‐6 Block of the Bozhong Sag in the Bohai Bay Basin, the mechanisms driving their creation and evolution are not well known for low degree of exploration. Using core data, image logs, and our knowledge of the regional geology, we characterized the features and explored the formation mechanisms of these fractures. Our core samples captured two types of fractures: high‐angle shear fractures and low‐ to moderate‐angle tensile fractures. Based on the cross‐cutting relationships, four distinct sets of fractures formed at different stages and related to different tectonic events. The first fracture set (Set I) is high‐angle shear fractures having an E‐W orientation, partially filled by calcite, and was formed by transpressive processes in the Early Yanshanian. The second fracture set (Set II) is characterized by moderate angles, partially filled by asphalt and calcite with variable orientations and a more mesh‐like appearance, formed in an extensional environment in the middle Yanshanian. During transpressive activities in the Late Yanshanian, the high‐angle shear fractures of the third fracture set (Set III) formed with NW‐SE orientations and partially filled by asphalt. The fourth fracture set (Set IV), which occurred in the Early Himalayan, involves high‐angle shear fractures that is oriented in the NE‐SW direction and only part of them are filled by clay minerals. Macroscopic fracture features, orientations, and distribution patterns can significantly alter the nature of a reservoir; the fractures in Set I (E‐W‐oriented) and III (NW‐SE‐oriented) are typically the widest (excluded fills), and they tend to have the greatest impact on the overall reservoir permeability.

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The reservoir characteristics and their significance for deliverability in metamorphic granite buried hill: a case study from the JZS oil field in the Liaodong Bay Basin, NE China

Cited by 16 publications

References 14 publications

Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China

Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China

Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep‐water of the Qiongdongnan Basin, Northern South China Sea

Characteristics and formation mechanism of the fractures in Archaean buried hill: A case study in the BZ19‐6 Block, Bohai Bay Basin, China

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