Reservoir condition analysis of a buried granite hill in the Huizhou Depression and its petroleum geological significance

LUO Wei; CAI Junjie; WAN Qionghua; GAO Xiang; YAN Pin

doi:10.16562/j.cnki.0256G1492.2018071601

2019 Vol. 39, No. 4

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Article navigation > Marine Geology & Quaternary Geology > 2019 > 39(4): 126-135

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LUO Wei, CAI Junjie, WAN Qionghua, GAO Xiang, YAN Pin. Reservoir condition analysis of a buried granite hill in the Huizhou Depression and its petroleum geological significance[J]. Marine Geology & Quaternary Geology, 2019, 39(4): 126-135. doi: 10.16562/j.cnki.0256G1492.2018071601

Citation:

LUO Wei, CAI Junjie, WAN Qionghua, GAO Xiang, YAN Pin. Reservoir condition analysis of a buried granite hill in the Huizhou Depression and its petroleum geological significance[J]. Marine Geology & Quaternary Geology, 2019, 39(4): 126-135. doi: 10.16562/j.cnki.0256G1492.2018071601

Reservoir condition analysis of a buried granite hill in the Huizhou Depression and its petroleum geological significance

1.
CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy Sciences, Guangzhou 510301, China
2.
CNOOC (China) Co., Ltd. Shenzhen branch, Shenzhen 518054, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 16 July 2018

Revised Date: 11 March 2019

Publish Date: 28 August 2019

Abstract

Abstract

After nearly forty years of exploration and production, the Huizhou Depression of the Pearl River Mouth Basin (PRMB) of the South China Sea has entered the stage of duplex exploration.It is urgent to open up new exploration areas. The buried granite hill, which is selected by some scholars as one of the succeeding areas, but questioned by others since no oil reservoir has been encountered so far, is selected in this paper as the research target.In order to open up the new exploration area of igneous reservoirs, therefore, a discovery well was drilled on the structure A of the Huizhou Depression of the PRMB.Specific analysis, such as thin sections and FMI(Formation Micro-Scanner Image)are made for the borehole cores. Three types of fractures are recognized in the reservoir i.e. group fractures, reticulated fractures and isolated fractures, and four segments are divided where fractures are more developed.Secondary dissolution includes those along cracks and dissolution voids. Vertical zonation, which includes the clay zone, fractured zone and bed rock zone, is observed due to differential weathering and leaching. The reservoir space is dominated by associated fractures, which are filled by calcite. RCI (reservoir characterization instrument) and MDT (modular cable reservoir dynamic tester) are adopted to test reservoir conditions, and the conditions for hydrocarbon generation, storage, capping and migration are analyzed individually for evaluation of petroleum geological conditions.
- buried granite hill /
- reservoir /
- PRMB(the Pearl River Mouth Basin) /
- Huizhou Depression

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References

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