南堡35-2油田储层空间分布特征研究

地震反演和地质统计是表征储层空间分布的两种方法.地震反演能较好地描述厚砂层的横向分布规律,地质统计则能较好地描述薄砂层的垂向变化,利用这两种相结合的方法对南堡35-2油田储层空间分布进行了研究.研究后认为,本区河流相砂体有砂体和砂体直接接触、砂体上下叠置及砂体相互切割三种接触关系;储层空间分布有单砂体厚度大、连续性强、平面分布广及单砂体厚度小、垂向"泥包砂"、呈窄条状二种模式.较厚砂体横向连通性好、分布范围广,反映了河道的侧向迁移、砂体叠加的特征;砂层薄、横向分布范围小、连续性差、多呈孤立状,是曲流河截弯取直的结果.

DISTRIBUTION CHARACTERS OF RESERVOIR SPACE IN NANPU 35-2 OILFIELD

Seisnic inversion and geostatistic methods are two important methods for demonstrating reservoir space distribution. The seismic inversion method can properly describe the lateral distribution regularity of thick sand bodies; the geostatistic method can describe vertical changes of thin sand bodies. The combination of these two methods was used to study the reservoir space distribution of Nanpu 35-2 Oilfield, the results suggest that three kinds of contact relations could be found within fluvial facies sand bodies in the study area such as direct connection, superimposition and cut; the space distribution models include a thick sand body with continueous and extensive plane distribution and a thin sand body with banded vertical distribution. The first distribution model reflects the feature of river channel lateral shift and the superimposition and the second distribution model is the result of meandering stream cutoff.