新场气田须二段裂缝综合预测方法研究

Method for Integrated Prediction of Fracture in T_3x_2 of Xinchang Gas Field

新场气田须二段储层物性较差,裂缝发育段获得工业产能的几率大,裂缝发育带的预测对该气藏的勘探开发具有重要的意义。为了进行研究区裂缝发育带预测,提出了多种技术相结合进行裂缝发育段预测的新方法,综合应用了构造应力场模拟、相干体属性分析、波形特征统计分析等方法进行了研究区须二段储层裂缝发育的综合预测。构造应力场模拟从裂缝形成的地质力学成因出发,可在宏观上把握裂缝发育带的大致范围;在此基础上,进一步通过地震相干体属性分析研究,在微观上小尺度范围内预测裂缝发育的区域;波形特征统计分析法从不同的角度研究裂缝发育带,可以和相干体属性分析的结果互相验证和补充,综合预测结果与单井成像测井资料符合较好。该方法充分结合了不同方法的优点,使得各种方法的优势相互补充,能更为有效地预测裂缝发育带。

Physical property in T3x2 reservoirs of Xinchang Gas Field was poor,high probability was obtained for fracture growth,its prediction was of great significance for the gas reservoir exploration and development.For fracture prediction in the studied area,a new method combined with various techniques was proposed to predict the fracture growth.The methods of tectonic stress field,coherency analysis,the waveform characteristics of statistics were used comprehensively for predicting T3x2 fracture growth.Based on the genesis of geologic mechanics in the simulation of tectonic stress field,its growing range was macroscopically controlled.By further coherency analysis,the area of its growth was microscopically controlled.The waveform characteristic analysis was used study its growing zones from different viewpoints,its result should be proven each other with that of coherent analysis.Its result is consistent with that of single well logging imaging.The method obtains the advantages of different methods and can be used for better prediction of reservoirs.