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下二叠统下石盒子组是大牛地气田低孔、低渗透岩性气藏的主要产气层之一,分析其储层的非均质性,精细描述储层的各种属性特征,是气田进一步开发的关键。为此,综合利用地质、地震、测井等各种资料,应用三维随机建模技术,根据两步法建模理论和地质统计结果,采用地震、沉积模式控制等多信息融合约束的建模方法,建立了研究区储层的沉积微相模型,精细描述了下石盒子组辫状河沉积特征,剖析了各沉积微相砂体的展布形态与叠置关系;依据相控建模方法,分析各微相下的属性分布特征,统计属性分布变密度函数,以已经建成的沉积微相模型为基础,完成各属性的随机模型,分级、分层次详细地描述储层的非均质性,并指出心滩沉积的粗砂岩、砂砾岩等为相对高孔、高渗带,是主要的产气砂体。
The Lower Permian Lower Shihezi Formation is one of the major gas-producing layers in the low-porosity and low-permeability lithologic gas reservoirs in the Daniudi Gas Field. The heterogeneity of the reservoirs is analyzed to describe various attributes and characteristics of the reservoirs in detail. Gas field is the key to further development. Based on the two-step modeling theory and geostatistical results, a comprehensive modeling method based on multi-information fusion constraints, such as seismic and sedimentary model control, is used to comprehensively utilize various data of geology, earthquake and well logging. , The sedimentary microfacies model of reservoirs in the study area was established, the depositional characteristics of the braided river in the Lower Shihezi Formation were described, and the distribution patterns and overlying relationships of the sedimentary microfacies sand bodies were analyzed. According to the phased modeling method, Based on the sedimentary microfacies model, the stochastic model of each attribute is completed, and the heterogeneity of reservoir is described in detail. It is also pointed out that the coarse sandstone and glutenite deposited on the heart beach are relatively high-porosity and high-permeability zones and are the major gas-producing sand bodies.