论文详情
针对阿姆河右岸H区块卡洛夫—牛津阶致密碳酸盐岩储层有效裂缝预测问题,综合应用岩心、成像测井、地震及测试资料,在分析裂缝发育特征的基础上,提出了构造应变模拟与地震体曲率属性相结合的有利裂缝带预测方法。首先由三维构造应变模拟揭示受构造应变分布控制的裂缝发育区,经过分析发现应变强度高的褶皱枢纽带、陡前翼及陡后翼部位的裂缝发育程度(密度、长度与开度)明显优于应变强度低的缓后翼部位;然后通过井震标定优选地震体曲率属性并识别裂缝发育带,建立了构造应变与最大正曲率综合预测裂缝发育情况的方法,并指出高应变区的最大正曲率高值带为最有利的裂缝发育带,可形成优质裂缝型储层;最后根据已钻井资料对预测结果进行了验证,验证结果表明高应变区的最大正曲率高值带储层连通性好且生产压差低,单井产气量高且产水低,证明了该预测方法的有效性。
关键词：裂缝预测;致密碳酸盐岩;断展褶皱;裂缝特征;构造应变;体曲率
In view of fracture prediction in Callovian-Oxfordian carbonate reservoir in H Block of Amu Darya Right Bank,Turkmenistan,a method integrating structural strain simulation and seismic volumetric curvature attribute was developed.The method comprehensively used core,image logging,and seismic data,with the analysis of fracture characteristics as a basis.Firstly,the fracture development zone controlled by structural strain distribution was revealed by three-dimensional kinematic modelling.High strain regions such as the fold hinge,steep forelimb,and the steep backlimb,were expected to contain high intensity and long fractures with wide apertures,in contrast to low strain regions such as gentle backlimb.Then well-seismic calibration was adopted to optimize volumetric curvature attributes to identify effective fracture zones,and a comprehensive prediction method was proposed by combining structural strain and maximum positive curvature.It is showed that high value zones of the maximum positive curvature within the high strain regions are the most favorable fracture zones,which can form high-quality fractured reservoirs.Finally,testing on the drilled wells validated that the reservoir with high value zones of the maximum positive curvature within the high strain regions show good reservoir connectivity,low production pressure difference,high gas production in a single well,and low water production,verifying the validity of the proposed method.
国家科技重大专项“中亚地区含气盆地成藏规律与勘探技术”(2011ZX05029-003)和中国石油天然气集团公司海外重大科技项目“海外天然气藏复杂储层精细评价与预测技术”(2018D-4305)共同资助。