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低渗透砂岩油藏开发主要矛盾机理及合理井距分析 被引量:111
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作者 王端平 时佃海 +1 位作者 李相远 陈光梅 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2003年第1期87-89,共3页
低渗透油田开发效果比初期预测效果变差的原因 ,一是由于地层压力下降 ,上覆净压力相对增加而引起渗透率降低 ;二是储集层流态由拟达西渗流变为低速高阻非达西流。根据胜利油田低渗透油藏实际 ,定义了技术极限井距概念 ;根据渗流流量方... 低渗透油田开发效果比初期预测效果变差的原因 ,一是由于地层压力下降 ,上覆净压力相对增加而引起渗透率降低 ;二是储集层流态由拟达西渗流变为低速高阻非达西流。根据胜利油田低渗透油藏实际 ,定义了技术极限井距概念 ;根据渗流流量方程和流速方程 ,结合室内实验确定的实验模型 (临界驱替压力梯度 )和现场资料 ,提出技术极限井距计算公式 ,以胜坨油田坨 76块进行试算 ,计算结果比较合理。图 2表 1参 展开更多
关键词 低渗透砂岩油藏开发 机理 压力梯度 易流动带 技术极限井距
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Characteristics of Agricultural and Livestock Products Trade Flows between China and the “Belt and Road” Initiative Region: From the Perspective of Biocapacity 被引量:4
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作者 JIN Mingming XU Zengrang 《Journal of Resources and Ecology》 CSCD 2019年第6期584-597,共14页
In the context of global ecological overload,international trade has become one of the most important ways to make up for the ecological deficit.This study takes the"Belt and Road"Initiative as the study are... In the context of global ecological overload,international trade has become one of the most important ways to make up for the ecological deficit.This study takes the"Belt and Road"Initiative as the study area to analyze the biocapacity and ecological footprint characteristics between China and other countries along the"Belt and Road"Initiative.Trade flow characteristics were explored from the perspective of biocapacity.The import and export of virtual land was used to assess the effect of trade on compensating for the resource gaps in crop and grazing land.The main results show that:1)In 2005-2014,the majority of"Belt and Road"countries were experiencing increasing degrees of overload.In China,cropland takes up the largest proportion of biocapacity,while the ecological footprint is dominated by the carbon footprint.2)The trade flow of agricultural and livestock products in the mainland of China shows a trend of increasing imports and decreasing exports,which increases dependence on specific regions.3)In 2005-2014,China’s trade in cereals and oil crops along the“Belt and Road”Initiative were generally net imports,and the share of cereals traded along the“Belt and Road”Initiative is increasing gradually,but that of oil crops decreased rapidly.4)The import trade has alleviated ecological deficit,as the selected products compensated for 1.03 times of the cropland deficit and 0.65 times of the grazing land deficit in China.This study is helpful to understand the relationship between the land use and trade deeply,and provide decision-making references for reducing ecological deficits,optimizing land resource allocation,and promoting win-win cooperation among China and other countries in the"Belt and Road"Initiative. 展开更多
关键词 BIOCAPACITY ecological footprint ecological deficit the"Belt and Road"Initiative region trade flows China
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