Origin of a giant fuzzy reflection zone and its implication for natural gas exploration in the southwestern Qiongdongnan Basin of the South China Sea

Yu, Jianhua; Yan, Pin; Wang, Yanlin; Yan, Qi; Tu, Guanghong; Chen, Changliang

doi:10.1007/s00343-022-1452-3

Cited by 3 publications

(3 citation statements)

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“…Mg/Ca and Ba/Ca ratios reflect the environmental temperature and salinity of the surrounding water, not only in the deep sea but also in the shallow sea. Fuzzy reflection zones and pockmarks have been observed in the Qiongdongnan and Zengmu Basins, suggesting active hydrocarbon transporting or even seeping (Yu et al, 2023;Wang et al, 2023b). Topographic variations and geomorphological features are essential references for boundary delineation (Wang et al, 2014;Tang et al, 2016).…”

Section: The Geological Framework and Topographic Variations Of The Scsmentioning

confidence: 99%

Geological environment in the South China Sea

2023

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The South China Sea (SCS), situated in southern China, at the junction of the Pacific Plate, the Eurasian Plate, and the Indian Ocean Plate, is a northeast-southwest trending semi-enclosed sea. It spans an area of approximately 3.5 million square kilometers and has an average water depth of about 1 200 m, its deepest point reaching 5 559 m. In 2021, a scientific expedition (called as U1 voyage) in the South China Sea was organized by the Innovation Research Team of Guangdong Special Key Program from March to April, this marks the first comprehensive scientific research voyage to the southern Uboundary corridor. Consisting of a total of 30 papers, this special issue is to share a portion of the research findings from this scientific expedition U1 voyage, covering six aspects: 1) characteristics of the marine ecosystem in the SCS and its response to marine dynamic processes; 2) multi-scale marine dynamic processes, sea-air interactions, and forecasting techniques in the SCS; 3) geomorphology and geological structure; 4) sedimentary processes and resource potential in the SCS; 5) geostrategy, rights and interests maintenance and strategic countermeasures in the SCS; 6) marine scientific instruments. By integrating the scientific research with the study of history, jurisprudence and international strategies, this issue presents new insights into the formation history and scope evolution of the SCS, and it also seeks to establish a new scientific framework based on the marine governance and development of the SCS.

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Section: The Geological Framework and Topographic Variations Of The Scsmentioning

confidence: 99%

Geological environment in the South China Sea

2023

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“…Since Hearn et al proposed the concept of flow unit, many scholars at home and abroad have used the flow unit index to divide reservoirs [1][2][3]. According to the concept of flow unit, the flow unit index is defined as:…”

Section: Flow Unit Theorymentioning

confidence: 99%

“…is the product of the interfacial tension under laboratory conditions and the cosine of the contact angle, which is 367 for air-mercury contact; ρ 、ρ are the density of formation water and crude oil, g/cm 3 , ρ w =1.0 g/cm 3 , ρ o =0.845 g/cm 3 in the study area; H is the height of the oil column above the free water interface, m; g is the acceleration of gravity, and its value is 9.8N/kg.…”

Section: Determination Of Original Water Saturationmentioning

confidence: 99%

Logging evaluation method research of water-flooded layer based on flow unit theory

Hu¹

2023

Fourth International Conference on Geoscience and Remote Sensing Mapping (GRSM 2022)

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The exploration and development of P oilfield in Melut basin South Sudan is earlier. The water-flooded layers are caused by bottom water coning, edge water propulsion and injected water. At present, the oilfield has entered the middle and high water cut stage. In order to stabilize oil and control water and enhance oil recovery, it is necessary to carry out the evaluation of water flooded layer. Based on the flow unit index theory, the reservoir is divided into three types by cumulative frequency method using experimental data of mercury injection and physical properties. Then the water flooding level is qualitatively and quantitatively evaluated by comprehensively using logging and masterlog data.According to the sensitivity optimization of logging and masterlog, the spontaneous potential curve, resistivity curve and total gas curve are selected to identify the water-flooded layers. Based on the result of petrophysical facies, the original water saturation, remaining oil saturation and irreducible water saturation of different reservoir types are finely evaluated. Then the water cut content is determined accurately. The water-flooded layers are quantitatively evaluated. The method is used in the production practice, the result shows that the accurate identification rate of water-flooded layer is 90.9%. The result of calculation match well with the core analysis data. The quantitative evaluation of water-flooded layers match well with the production. The comprehensive evaluation method of water-flooded layer meet the needs of oilfield development and production.This method organically combines the petrophysical facies with the comprehensive evaluation of water flooded layer. The water flooded layer is finely evaluated, This result provides an important basis for stabilizing oil, controlling water and improving oil recovery in old oilfields.

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