Logging response characteristics and formation process of flushed zone in the Orinoco heavy oil belt, Venezuela

被引：0

作者：

Chen H. ^{[1
]}

Li C. ^{[2
]}

Wang Y. ^{[1
]}

Li J. ^{[2
]}

Huang R. ^{[3
]}

Tian C. ^{[2
]}

Hou Q. ^{[2
]}

机构：

[1] PetroChina Research Institute of Petroleum Exploration & Development, Beijing

[2] International Division, China Petroleum Logging CO. LTD., CNPC, Beijing

[3] China National Oil and Gas Exploration and Development Corporation Ltd., Beijing

来源：

Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2020年 / 47卷 / 03期

关键词：

Asphalt crust; Crude oil thickening; Flushed zone; Foam oil flow; Freshwater leaching; Orinoco heavy oil belt;

D O I：

10.11698/PED.2020.03.10

中图分类号：

学科分类号：

摘要：

The origins and logging responses of flushed zones in some blocks of Orinoco heavy oil belt, Venezuela are still unclear. To solve this issue, we examined the conventional logging, nuclear magnetic resonance logging, fluid viscosity, core analysis and oil field production data comprehensively to find out the logging responses and origins of the flushed zones. The results show that the main reason for the formation of flushed zone is surface water invasion, which leads to crude oil densification. The crude oil densification produces asphalt membrane (asphalt crust) which wraps up free water, causing special logging responses of the flushed zones. According to the different logging responses, we classified the flushed zones into two types and analyzed the formation processes of the two types of flushed zones. According to the characteristics of logging curves after water flush, we confirmed that the water flush began earlier than the reservoir accumulation. © 2020, The Editorial Board of Petroleum Exploration and Development. All right reserved.

引用

页码：547 / 554

页数：7

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