涠西南凹陷流沙港组一段储层物性影响因素研究

Control Factors on Physical Property of Liu-1 Member of Liushagang Fm in Weixinan Sag, Beibuwan Basin

张辉 姜平 蔡军 覃利娟 李华

ZHANG Hui JIANG Ping CAI Jun QIN Lijuan LI Hua

中海石油(中国)有限公司湛江分公司研究院, 广东湛江 524057

Zhanjiang Research Institute of CNOOC Ltd., Zhanjiang Guangdong 524057, China

南海北部湾盆地涠西南凹陷流沙港组一段是南海西部油田储量和产量新的增长点。根据目前已发现油田储层物性分析来看,其物性有高孔高渗、中孔高渗,也有低孔低渗,变化十分复杂。分析结果表明不同的沉积体系下的沉积微相、成岩作用是影响储层物性的主要因素。其中不同沉积体系下的沉积微相对物性的影响主要表现在受岩石组分、岩石粒度、泥质含量、分选系数的影响,储层表现不同的物性。成岩作用对物性的影响主要表现在压实和胶结作用的影响。溶解作用主要表现为粒内溶孔、长石溶孔等综合影响。不同影响条件下的储层孔隙结构也表现了不同特征。

The oil and gas in Liu-1 Member of Liushagang Fm in Weixinan Sag, Beibuwan Basin are hot points for increasing re-serves and production in Sourth China Sea Oil Field. Based on the analyzing results of reservoir physical properties in the discovered oil & gas fields, it is found that reservoir physical properties are very complicated, not only high porosity and high permeability, but also with medium porosity and high permeability, low porosity and low permeability. The study results indicate that under different depositional systems, microfacies and diagenesis are the main factors influencing the reservoir physical properties. Under different depositional systems, the reservoirs with different microfacies have different physical properties due to influence of the rock com-position, grain sizes, argillaceous content and sorting coefficient. Diagenesis might influence the reservoir physical properties due to compaction and cementation. Due to dissolution, intragranular dissolved pores and feldspar dissolved pores have great influence on reservoir physical properties. Reservoir pore structures have different characteristics under different influence conditions.

https://doi.org/10.3969/j.issn.1008-2336.2013.02.008