摘要
敖南油田开发目的层为葡萄花油层，属于滨浅湖相沉积，以含泥细砂质粉砂岩为主，薄层或薄互层发育，储层物性差，是一个典型的岩性油藏。针对油田开发过程中部分储层表现为低阻油层特征的问题，应用黏土分析、扫描电镜、压汞、重矿物分析等岩心分析资料，从岩石导电机理分析入手，对敖南油田葡萄花低阻油层的成因进行深入研究，分析认为高束缚水、高矿化度是该油田低阻油层形成的主要原因，黏土附加导电性、导电自生矿物和砂泥岩薄互层对低阻也产生了一定的影响，而其根本原因是敖南油田的滨湖相沉积环境。依据研究结果，结合敖南油田实际，提出了进一步研究低阻油层成因的思路。
The target layer of Aonan Oilfield is Putaohua oil reservoir which belongs to shore and shallow lake facies. The reservoir takes mud-bearing fine sandy siltstone with well-developed thin or interbeded layers with the above thin formation. And moreover the physical properties of this layer are rather worse, so in a word, it is a typical lithological oil reservoir. In views of the problem of low-resistivity characteristics shown in partial reservoirs during the oilfield development course, this paper uses core analyzed data such as clay analysis, scanning electron micros-copy, mercury injection, heavy mineral analysis and so on to deeply study the Genesis of low-resistivity Putaohua reservoirs in Aonan Oilfield from the starting point of litho-electrie mechanism. The analysis results show that high irreducible water saturation and high salinity are the main reasons for the formation of the above oil reservoirs. In addition, clay conductivity, conductive minerals and sandstone-mudstone thin interbeds also have a definite impact on the generation of low-resistivity reservoir. In a word, the sedimentary environment of lakeshore facies of the oil- field is the basis of forming conditions of low-resistivity oil layers. Based on the above study results and combined actual oilfield practice, the thinking of further study on this kind of reservoir has been pointed out.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2009年第1期139-142,共4页
Petroleum Geology & Oilfield Development in Daqing
