松辽盆地三肇地区储集层研究

The research on reservoir in Shanzhao area in Songliao basin,

三肇地区下白垩统的葡萄花油层由30—50m的薄砂岩、泥岩互层组成。由于砂层厚度小于现有地震分辨率的极限,所以直接利用地震资料难以测定砂层厚度。但是,由于松辽盆地的特殊沉积环境,砂层厚度与地层厚度的分布有密切的对应关系,其总的规律是地层厚,砂层也厚;地层薄,砂层也薄。因此,可以利用葡萄花油层沉积前的T2一T1′之间的反射层厚度来研究葡萄花油层沉积时的古地貌和砂岩的分布。再根据砂层分布规律和构造特征进行储集层的预测和油气圈闭评价。实践表明,应用这种预测方法,可提高钻井的成功率。文中详尽地介绍了具体预测方法和预测效果。

Putaohua reservoir(lower Cretaceous)in Shanzheo area consists of sand and shale interbeds whose total thickness ranges from 30m to 50m.The sandstone thickness is less than the seismic resolution limit; therefore, it is difficult for us to determine the sandstone thickness with the use of seismic data.The sandstone thickness is close related to the relevant formation thickness because of the specific sedimentary environment in Songliao basin.Generally speaking, the sandstone thickens when the thickness of the relevant formation increases, and the sandstone thins when the thickness of the relevant formation decreases.Thus, both the sandstone distribution and the palaeogeomorphic environment in which Putaohua reservoir was formed can be ascertained by researching into the thickness of the underlying seismic sequence bet- ween T_2 reflection and T_1' reflection.Finally, we can predict the reservoir and evaluate the oil-gas trap in the light of the sandstone distribution and geological structure.The practice shows that this prediction method can raise the success rate of drilling.The prediction method and prediction effect are detailed here.