苏里格气田陕186井区致密砂岩气储层描述

发布时间：2018-08-14 14:36

【摘要】：鄂尔多斯盆地苏里格气田单砂体薄且有效储集层与围岩阻抗差异小,使得常规反演难以精细描述储集层。为了提高致密砂岩气藏储集层“甜点”钻遇成功率,有效指导水平井设计,以苏里格气田陕186井区为研究区,利用研究区内高精度三维地震资料以及钻、测井资料,探索有效方法对主要含气层段上古生界二叠系石盒子组盒8段至山西组山1段进行储层预测。本文首先进行基础地震构造解释,了解区域小幅度构造分布,并利用地震属性分析、谱分解定性预测厚砂带展布。然后在此基础上分析目的层,将地质统计反演与泊松比反演有机结合对储集层进行定量描述:通过monto-carlo算法进行地质统计反演,精细刻画了上古生界二叠系石盒子组盒8段四套小砂层,纵向上预测精度可以达到10m以下,并运用叠前弹性参数反演预测目的层段的储层及有效储层,同时创新性地进行了脆性反演,预测出储层的脆性分布特征。接着,在叠前反演的基础上采用地质建模技术描述了有效储集层物性(孔隙度、渗透率)的空间展布。在以上分析基础上,进行综合评价,描述了研究区有效储层厚度、物性及含气性的空间展布,综合评价出研究区盒8+山1段的I+II类有利区153.79km2,形成了致密气储层的精细描述技术,为苏里格气田致密砂岩气藏水平井的开发提供了技术支持。
[Abstract]:In order to improve the success rate of "sweet spot" drilling in tight sandstone gas reservoirs and effectively guide the design of horizontal wells, the Shan 186 well area of Sulige gas field is taken as the study area, and the high precision of the study area is utilized. Three-dimensional seismic data and drilling and logging data are used to explore effective methods for reservoir prediction of the upper Paleozoic Shihezi Formation from He8 member to Shan1 member of Shanxi Formation in the main gas-bearing intervals. Firstly, the basic seismic structure interpretation is carried out to understand the distribution of regional small-amplitude structures, and the spectral decomposition is used to predict the distribution of thick sand belts qualitatively. On this basis, the target formation is analyzed, and the reservoir is quantitatively described by the combination of geological statistical inversion and Poisson's ratio inversion. Four sets of small sand layers in He8 member of Shihezi Formation of Upper Paleozoic are delicately depicted by using Monto-Carlo algorithm, and the vertical prediction accuracy can reach below 10m. The elastic parameter inversion is used to predict the reservoir and effective reservoir of the target interval, and the brittle inversion is carried out creatively to predict the brittle distribution characteristics of the reservoir. Combined evaluation, the effective reservoir thickness, physical properties and gas-bearing spatial distribution in the study area are described, and 153.79 km 2 of type I+II favorable area in the study area is evaluated comprehensively. The fine description technology of tight gas reservoir is formed, which provides technical support for horizontal well development of tight sandstone gas reservoir in Sulige gas field.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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