Study on Granite Buried Hill Reservoir Characterization and Modeling of Offshore S Oilfield in Bohai Bay

Zhang, Yuqing; Hu, Guohang; Fan, Tingen; Wang, Hui; Song, Lei; Xu, Lingyu; Chen, Fei

doi:10.1190/ice2015-2202271

Cited by 1 publication

(1 citation statement)

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“…Drilling revealed that the longitudinal structure of the granite buried hill in this area is complex, the formation mechanism and distribution of the buried hill reservoir being one of the key factors restricting exploration. As for the study of the basement of the buried hill reservoir, previous scholars have mostly used single fractures to predict the high-quality reservoir distribution of the buried hill (Zhang et al, 2016;Tang et al, 2017). However, most researchers ignored the influence of the structural evolution process, structural type, lithology, fluid and other factors on the development of the granite buried hill reservoir.…”

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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Section: Introductionmentioning

confidence: 99%