葡I3 3单元废弃河道识别与平面连续性预测

IDENTIFICATION OF ABANDONED CHANNEL AND PREDICATION OF PLANE CONTINUITY IN PU I3 3 UNIT

高弯曲分流河道内部废弃河道的准确识别与平面连续性预测是描述点坝砂体分布规模的重要因素。因此，针对萨尔图油层高弯曲分流河道沉积发育的实际情况，应用自然电位和微电极测井曲线，以深、浅三侧向曲线作为辅助资料，实现沉积单元界限的精细划分。根据废弃河道具有测井曲线形态相近、韵律性相同、有效厚度内部三类夹层较发育的特点，将废弃河道按测井曲线形态分为6种类型，从单井上分析识别废弃河道。采用砂体厚度等值图与沉积相带图的叠加预测废弃河道平面连续性，结合古地形图及层内隔夹层分布特点进一步完善。并通过层内剩余油分布状况进行验证。应用于水平井区河道砂体内部建筑结构研究，对废弃河道的识别精度达到85％。

The important factors that describe the distribution scale of point-bar sand body are the accurate identification and plane continuity predication of abandoned channel inside high inclination distributary channel. Therefore, on account of the actual situations of sedimentary development of high inclination distributary channel in Sartu reservoir, based on the deep-shallow triple lateral curve as addition information, fine classification of sedimentary unit limit is obtained by applying the SP curve and microlog curve. According to the characteristics of similar shape of logging curve, same rhythmicity and developed Type III interlayer within net thickness occurred in the abandoned channel, the abandoned channel is divided into 6 types as the shape of logging curve, which is identified from analysis of single well. The plane continuity of abandoned channel is predicted with sandy thickness chorogram and sed- imentary facies belt map, with improvement in accordance with palaeotopographie map and distributary characteristics of internal interbeds uheriorly, moreover, approved according to the distribution situations of internal residual oil. Identification accuracy for abandoned channel achieves 85% based on the architecture study applied inside channel sand body of horizontal well area.