礁滩相储层裂缝识别方法研究

Study on identification method of reef flat carbonate rock reservoir fracture

普光礁滩相碳酸盐岩储层与常规裂缝性碳酸盐岩储层相比,具有厚度大、孔隙发育等特点,储层储集空间以孔隙为主,局部发育裂缝,常规双侧向电阻率法等裂缝识别方法适应性差。文中在岩心观察、成像测井识别裂缝基础上,研究形成了一套针对礁滩相碳酸盐岩储层地质特点的裂缝识别方法,即采用深电阻率与自然伽马、孔隙度的交会图版法识别致密岩性段裂缝,采用电阻率滤波差值法识别孔隙发育段裂缝,优选叠前方位振幅、方位频率衰减等地震属性预测裂缝空间展布,进而模拟建立裂缝分布模型研究裂缝分布特征。研究成果较好地指导了气藏地质模型建立和气井合理配产,并为开发动态分析提供了可靠的地质依据。该研究方法基于常规的测井资料,具有较大的实用价值和推广意义。

Reef flat carbonate reservoir is characterized by great thickness and large porosity in Puguang, compared with conventional fractured carbonate reservoir. Conventional dual lateral resistivity method of fracture identification shows a poor adaptability. In this paper, a set of fracture identification methods have been established for the geological characteristics of＂ reef tla! carbonate reservoir based on the core observation and imaging logging methods. The fracture of tight lithologie reservoir can be identified by using the cross plot of deep resistivity, natural gamma and porosity. The fracture of pore-developed reservoir can be distinguished through the use of difference filter of resistivity. The distribution of fracture space can be predicted with the optimization of the seismic attributes of pre-stack orientation amplitude and azimuth frequency attenuation. Then the fracture distribution model can be established to study the characteristics of fracture distribution. The research result can be used to guide the geological modeling of gas reservoir and the reasonable production allocation of gas well, which provides a reliable geological basis for the dynamic analysis of development.