火山岩测井弹性响应特征及其正演模拟

THE LOGGING ELASTICITY RESPONSE CHARACTERISTICS AND FORWARD MODELING OF VOLCANIC ROCK

准确描述深层气田火山岩的岩石弹性响应特征是常规测井地层评价、地震反演和储层预测的关键因素。在探讨火山岩的矿物组分特征并分析影响火山岩弹性响应特征的岩性、成岩和矿物组分的基础上，建立起“中子-密度交会”火山岩岩性分类方法；根据火山岩骨架矿物和充填矿物的基础弹性响应特征，应用Self Consistent模型正演不同岩性、物性和流体性质的岩石弹性响应特征；在标定多井实测密度、纵波速度和横波速度条件下，优化、调整了所建立的岩石物理模型参数，找出区域稳定的岩石物理响应规律，为地震储层预测奠定了基础。

The accurate description of rock elasticity response characteristics of volcanic rock with different lithology in deep gas field is the key factor that influences the reservoir evaluation by conventional logging, the seismic inversion and the reservoir prediction. Based on the study on mineralogical composition of volcanic rock and the analysis of factors that influence the elasticity response characteristics of volcanic rock, including lithology, diagenesis and mineralogical composition, the Neutron-Density Crossplot Method, a new lithologic classification method of volcanic rock, is developed. According to the basic elasticity response characteristics of framework mineral and guest mineral of volcanic rock, forward modeling is conducted to the elasticity response characteristics of rocks with different lithology, physical properties and fluid properties applying SelfConsistent Model. Under the circumstances that actually measured density of multiple wells, compressional velocity and shear velocity have been determined, the parameters of petrophysieal model are optimized and adjusted, so as to find out physical response regular pattern of regionally stable rock and establish a foundation for seismic reservoir prediction.