惠州凹陷A区块珠海组潮汐沉积层序地层与储层分布预测

惠州凹陷珠海组沉积时期,海侵自西南方向进入凹陷,潮流对来自西北方向的古珠江三角洲沉积物有强烈改造作用,在凹陷西南部形成近海潮汐沉积,研究区以潮坪沉积作用为主。运用高分辨率层序地层学原理分析了A/S值变化过程中潮汐相的沉积学与地层学响应,以岩心、测井资料为基础,对珠海组进行了高频基准面旋回划分。在时间地层单元格架内,以潮汐相沉积模式为指导,以井—震界面标定与追踪后的三维数据体为基础,运用地震沉积学分析方法和地层切片技术,优选地震属性,对研究区储层分布进行了预测,分析了其时空演化特征,为该区油气勘探与开发提供了依据。

Sequence Stratigraphy and Reservoir Prediction of Tidal Deposits in Zhuhai Formation of Block A, Huizhou Depression

During the period of Zhuhai Formation deposition in Huizhou depression, marine transgression from the southwest seaway entered the depression. The sediments supplied by Paleo-Pearl River Delta from the northwest in this area were transformed by tidal current and then offshore tidal deposits were formed. Tidal flat sedimentation was dominated in Block A of the study area. Using high-resolution sequence stratigraphy principle, medium-scale stratigraphic cycles which response to base-level cycles are recognized in Zhuhai Formation by the analysis of sedimentological and stratigraphic responses to A/S value changes based on cores and well logs. With the guidance of tidal deposition model, tidal reservoir sandstones are predicted in chronostratigraphic framework by using seismo-sedimentological analysis methods and stratigraphic slice technology, optimization of seismic attributes based on 3-D seismic data in the study area, which provides more evidences for oil and gas exploration and development in this Block.