滨里海盆地F区块盐下深层碳酸盐岩相控储层预测

Facies-Constrained Reservoir Prediction of Pre-Salt Carbonate Reservoir Deeply Buried in F-Block of the Caspian Basin

滨里海盆地F区块石炭系杜内阶C1t储层埋藏深,受盐岩遮挡影响地震资料质量差,地震资料分辨能力和成像品质低,储层预测精度低,地震属性分析存在多解性,常规储层及含油气预测难度大,制约着勘探的进展。应用相控储层预测技术,通过地震相、测井相、岩相等综合分析,确定了研究区发育3种沉积相(开阔台地相、台地边缘相和台盆相),与地震属性分析建立联系并对其约束,挑选出与研究目标关系最密切、反映最敏感的振幅属性进行储层预测,预测出2个储层发育区。钻探实践表明,相控基础上的储层预测结果与实钻吻合率100%,实现了对复杂地质体的准确预测和描述。

Carboniferous Tournaisian C^t reservoir of F block in the Caspian Basin, deeply buried under gypsiferous rock, which seriouslyaffects the quality of seismic data, is difficult to be predicted by conven- tional methods with unfavorable factors of low seismic resolution and imaging quality, restricting the pro- gress of the exploration. By the application of facies-constrained reservoir prediction technology, 3 sedi- mentary facies were confirmed according to integrated analysis of seismic facies, logging facies and core data. Under the control of sedimentary facies, 2favorable reservoir zones were predicted by amplitude which is the most sensitive attribute for reservoir prediction. Application in favorable reservoir zone Ishows that 100% of the facies-constrained reservoir prediction matches the realdrilling results. There- fore, under the constraints of sedimentary microfacies and sedimentary characteristics, seismic attribut- ionscan be used to accurately predict and characterize complex reservoirs.