W—19—1水下冲积扇的地质解释

Geologic interpretation of the W-19-1 underwater alluvial fan

南海西部石油公司研究院, 湛江524057

Research Institute, Nanhai West Oil Corporation, Zhanjiang, 524057

本文依据ZH地区A－2构造南断裂下降盘多个方向的地震资料(包括三维地震资料),发现在下第三系地层里存在一个厚度大,范围广,与周围地震相截然不同的异常体。经速度分析和某些地震资料的特殊处理,结合区域地质构造和沉积特点进行综合分析研究,确认它为W—19—1水下冲积扇。经过综合评价,笔者认为钻探此砂体具有很重要的勘探意义。

on the basis of varied-direction seismic data (including 3-D seismic data) from the downthrown side of the southern ZH fracture, an anomaly volume with large thickness and wide range, which is different from the surrounding seismic facies has been found on the Paleogene strata. Via the velocity analysis,special processing of seismic data and the integrated studying of the regional geologic structure and sedimentary features, it is confirmed to be W-19-1 underwater alluvial fan. The comprehensive evaluation result show that this sandy body is worth drilling for its survey significance.