中山川油区储层物性及裂缝特征研究

通过大量的岩心观察、铸体薄片鉴定、岩心和薄片的古地磁定向分析,以及油井注水实验结果的分析,对中山川油区长4+5—长6储层的物性及裂缝特征进行了研究.结果表明:油区的主力油层以低成熟度的细粒—中粒长石石英砂岩为主,储层孔隙种类较多,原生的粒间孔及次生的溶蚀孔为储层的主要储集空间;储层水平和网状裂缝非常发育,具有张裂缝特征,构造型的NE向裂缝占主要地位.在区域最大主应力的控制下,人工压裂裂缝的方向主要为NE-NNE向.

Physical properties and the fracture characteristics of the reservoir in Zhongshanchuan Oilfield

The physical properties and the fracture characteristics of Chang 4+5-Chang 6 reservoir in Zhongshanchuan Oilfield are studied according to core observation,casting thin section identification,the paleomagnetic oriented analysis of cores and casting thin sections and the experimental analysis of the water injection of oil wells.It is shown that the main reservoirs in the studied area are mainly composed of the feldspar-quartz sandstone of fine-medium size with low maturity,there are many reservoir pore types,and main storage space is primary intergranular pores and secondary dissolved pores.The horizontal fractures and honeycomb tensional fractures are developed in the reservoirs,and the NE trending fractures caused by structure are the main effective fractures of the reservoir.The fracturing cracks under the control of regional maximum principal stress are almost in NE-NNE direction.