精细构造解释与储层预测技术在泌阳凹陷中南部地区二次勘探中的应用

Application of fine seismic structure interpretation and reservoir prediction technique in the second time exploration in the center and south part of Biyang Depression

泌阳凹陷属陆相断陷式碎屑沉积盆地 ,中南部地区储层为扇三角洲和辫状河三角洲前缘沉积 ,相变快 ,成岩不均一 ,地震速度变化快 ,储层呈砂泥薄互层状 ,圈闭类型有断鼻、断块和地层加岩性圈闭。针对深层系构造特征、储层特征及速度变化特点 ,采用层位标定与层位综合解释技术、断层精细解释技术和变速成图技术 ,有效地进行了构造精细解释 ;采用测井约束波阻抗反演和地震属性分析技术 ,进行了砂泥薄互层储层预测。研究成果在泌阳凹陷中南部地区二次勘探中取得明显效果。

Biyang Depression is one of the lower Tertiary faulted basins. In the center and south part of the Biyang Depression, the reservoirs locate in fanned delta and braided stream delta environments, which leads to fast changes of facies and seismic velocity as well as diagenetic inhomogeneity. The reservoirs consist of thin interbeds of sandstone and mudstone. The types of traps include fault-nose, faulted block and structural-lithological pattern. According to the structure characters of deep stratums, reservoir characters and variability of velocity, we use horizon calibration, integrated interpretation, fine fault interpretation and variable velocity mapping to accomplish fine interpretation of structures, and adopt log-constrained inversion and seismic attributes to predict the thin interbeded reservoirs of sandstone and mudstone. The results have been applied in the second time exploration in the center and south part of biyang depression.