岩石龟裂系数法在火山岩裂缝储集层预测中的应用
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摘要
本文针对辽河东部凹陷油燕沟中生界火山岩的具体特征,采用纵波波速的比值——“龟裂系数”裂缝分析法[1,2,3],研究了火山岩裂隙发育程度。综合龟裂系数裂缝分析及其他方法发现,该区中生界火山岩有效储集层的测井相特征主要表现为低密度、低中子、高声波时差和高伽马值等特征。此法的关键在于根据不同火山岩的岩性,选用合适的岩石骨架参数,在此基础上利用测井约束地震反演计算火山岩的层速度,进而计算出龟裂系数,然后根据已钻至火山岩井孔的测井相特征编制出火山岩预测厚度图。
Facing the concrete feature of Mesozoic vulcanite in Youyangou of Liaohe eastern depression,the paper uses the ratio of P-wave velocities[1～3]——the fractural analysis approach by flexural strength to study the development degree of vulcanite fracture.It is discovered through integrating the fractural analysis approach by flexural strength with other methods that the feature of logging facies in effecfire reservoir of Mesozoic vulcanite of the region mainly shows as low density, low neutron, high interval transit time and high gamma value.The key of the approach lies on selection of appropriate rock framework parameters according to different lithology of vulcanite.The approach uses the logging-constraint seismic inversion to compute the interval velocity of vulcanite on that basis, and further computes the flexural strength;then draws the predicted isopath map of vulcanite based on the feature of logging facies in vulcanite-drilled borehole.
Facing the concrete feature of Mesozoic vulcanite in Youyangou of Liaohe eastern depression,the paper uses the ratio of P-wave velocities[1～3]——the fractural analysis approach by flexural strength to study the development degree of vulcanite fracture.It is discovered through integrating the fractural analysis approach by flexural strength with other methods that the feature of logging facies in effecfire reservoir of Mesozoic vulcanite of the region mainly shows as low density, low neutron, high interval transit time and high gamma value.The key of the approach lies on selection of appropriate rock framework parameters according to different lithology of vulcanite.The approach uses the logging-constraint seismic inversion to compute the interval velocity of vulcanite on that basis, and further computes the flexural strength;then draws the predicted isopath map of vulcanite based on the feature of logging facies in vulcanite-drilled borehole.
引文
[1]谷德振.岩体工程地质力学基础.北京:科学出版社,1979
[2]白新华,王敬平.松辽盆地头台油田储层裂缝参数发育特征研究.大庆石油地质与开发,1999,18(1)
[3]张力佳,肖洪伟等.裂缝型新肇油田注水开发特征研究.大庆石油地质与开发,2005,24(6)
[4]迈杰鲍尔B H.裂缝性油藏开发特征.北京:石油工业出版社,1986
[5]张学汝,陈和平等.变质岩储集层构造裂缝研究技术.北京:石油工业出版社,1999
[2]白新华,王敬平.松辽盆地头台油田储层裂缝参数发育特征研究.大庆石油地质与开发,1999,18(1)
[3]张力佳,肖洪伟等.裂缝型新肇油田注水开发特征研究.大庆石油地质与开发,2005,24(6)
[4]迈杰鲍尔B H.裂缝性油藏开发特征.北京:石油工业出版社,1986
[5]张学汝,陈和平等.变质岩储集层构造裂缝研究技术.北京:石油工业出版社,1999
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