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川西坳陷须家河组二段埋深4000~6000 m,属三角洲沉积体系,地层等时异相沉积特征突出。由于勘探程度较低,导致前期研究常出现“砂对砂、泥对泥”的地层穿时对比的情况,地层对比及储层预测难度均较大。文章运用地震地层学与高分辨率层序地层学理论,在钻井岩心、测井资料和地震信息紧密结合的基础上,实现须家河组二段大区域的等时异相地层对比,建立了地震层序约束的等时层序地层格架,剖析了其纵横向高分辨率层序地层特征,分析了地震属性与储层纵横向变化的之间关系,最终运用地震属性分析技术实现了储层横向展布预测。该研究成果经钻井验证,取得了较好的应用效果,形成了较有针对性的方法技术思路。

SEQUENCE STRATIGRAPHIC CHARACTERISTICS AND RESERVOIR PREDICTION OF T3x2 IN WEST SICHUAN DEPRESSION

The second member of Xujiahe Formation, Upper Triassic (T3x2) belongs in delta sedimentary system with burial depths of 4000-6000 m and its synchronous-het-eropic sedimentary feature is outstanding. Because of the low degree of exploration, the diachronous lithostratlgraphic correlation often occurred in the past and it was difficult to carry out stratigraphic correlation and reservoir prediction. By use of the theoies of seismic stratigraphy and high-resolution sequence stratigraphy and in combination with the drilling, core, log and seismic data, the large area synchronous-het-cropic stratigraphic correlation of T3x2 was realized;the synchronous sequence stratigraphic framework constrainted by seismic sequence was set up; the vertical-lateral high-resolution sequence stratigraphic features and the relation between the seismic attribute and the vertical-lateral change in reservoir were analyzed;and the lateral reservoir distribution prediction was finished by applying seismic attribute analysis technique finally. Through verifying by drilling, it was shawn that the applied result of the research achievements was good and some new technological viewpoints were formed.