渤南洼陷裂缝成因类型及测井识别方法

Study on genetic types and logging identification of the fractures in Bonan Subsag

综合利用岩心资料、成像测井资料以及常规测井资料,明确了渤南洼陷裂缝的发育类型以及各类裂缝的成像测井响应,最终建立了有效裂缝的常规测井判识标准.研究表明:渤南洼陷主要发育构造张开缝、构造充填缝以及非构造缝.其中非构造缝以生烃超压缝为主,裂缝发育段,实测测井曲线具有高声波时差值、高中子孔隙度值、低密度值以及深浅双侧向电阻率幅度差的"两高一低一幅度差"特征,合成测井曲线具有"三高"的特点,即高声波时差变化率、高微球型聚焦电阻率变化率和高密度变化率.最后利用已有资料对裂缝判识标准进行反演验证,结果表明判识标准可靠.

Genetic types of the fractures in Bonan Subsag and the imaging logging response characters of different types of fractures are determined by comprehensively using core data,imaging logging and conventional logging data,and the conventional logging identification standard of effective fractures is established finally.The fracture identification results of two cases show that opening structural fractures,filled structural fractures and non-structural fractures are the main fracture types in Bonan Subsag.The non-structural fractures are mainly hydrocarbon-generating overpressure fractures,and in the fractured intervals,the measured logging curves are characterized by high acoustic velocity,high neutron porosity,low density and deep-shallow resistivity amplitude difference,and the synthesized logging curves are characterized by high varying rates of acoustic velocity,micro-sphere focusing resistivity and density.The fracture identification standard is verified by existing data,and the result shows that the identification standard is credible.