川西坳陷中-南段须家河组层序地层格架与生储盖组合

以地表露头、钻井岩芯、测井曲线和地震剖面的沉积相、基准面旋回与层序界面特征的综合分析为依据,将川西坳陷中-南段须家河组划分为2个超长期、4个长期和13个中期旋回层序.在此基础上,根据高分辨率层序地层旋回等时对比法则,运用二分时间单元分界线(层序界面和洪泛面)为优选时间-地层对比位置,以长期旋回层序为年代地层框架和中期旋回层序为等时地层对比单元,对川西坳陷须家河组进行了等时地层对比和建立高分辨率层序地层格架,并对地层格架中的沉积充填作用和生、储、盖组合特征进行了详细分析.

Sequence stratigraphic framework and source-reservoir-cap rock of Xujiahe Formation in West Sichuan depression

On the basis of isochronostratigraphy correlation of high resolution sequence stratigraphy, taking the boundary of dimidiate time quantum (base-level up and down cycles)as selective preference time-stratigraphy correlation positions, the long-term base-level cycles as correlation sketch and the mid-term base-level cycles as isochronostratigraphy correlation unite, the authors contrast the high resolution (sequence) stratigraphy with the relative depositional systerm tract of Xujiahe Formation and build (stratigraphy) framework. At the same time, the authors analysize the character of the source-reservoir-cap rocks in the area and find the distribution regularities of reservoirs.