摘要
深层砾岩储层具有较强的非均质性,研究难度远大于常规砂岩储层,分析研究方法上也有别于常规砂岩。采用大直径岩心物性分析、铸体酸溶扫描电镜孔隙结构研究、激光共聚焦微裂缝测试等先进技术结合偏光显微镜鉴定和岩心扫描技术,对徐家围子断陷营城组四段砾岩储层微观特征进行了综合测试分析研究,结果发现,填隙物的数量及充填方式是徐家围子断陷砾岩储层储集性的主要影响因素,砾岩虽以细-中砾为主,且普遍含砂,结构成熟度和成分成熟度均较低,但产能较好,新的综合测试技术发现了大量以前没有确定的普遍发育的有效微裂缝,且中砾岩中裂缝发育程度好于细砾岩,这是使储层渗透率得以改善的原因。
It is more difficult to research the deep conglomerate reservoir than conventional sandstone reservoir, because the former has serious heterogeneity and the methods used to analyze are different. With the application of advanced technologies consisting of full-diameter core analysis, acid-soluble casting SEM pore structure study and microfracture measurement with laser confocal microscope and polarized microscopic identification and core scanning, we research the microcosmic characteristics of the YingⅣ Member in Xujiaweizi Fault Depression. The results indicate that the main factors affecting reservoir physical properties of Xujiaweizi conglomerate reservoir are quantities of filling materials and filling modes. The productivity of conglomerate reservoirs is high, though they are mainly fine-medium gravel with high silt content and low maturity of component and texture. Mass of effective microfractures, which were not recognized ago, is discovered with the application of new comprehensive testing techniques and the fractures growth is better in pebbles than in fine gravels. These kinds of fractures cause the improvement of reservoir permeability.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2007年第4期43-46,50,共5页
Petroleum Geology & Oilfield Development in Daqing
关键词
砾岩储层
微观测试技术
岩石矿物学
孔隙结构
徐家围子断陷
conglomerate reservoir
microcosmic testing techniques
rock mineralogy
pore structure
Xujiaweizi Fault Depression
