应用地震数据体结构特征法预测塔北隆起LX1区块油气有利区

Application of Seismic Data Structure Characteristics to Prediction of Favorable HydrocarbonBearing Areas in Block-LX1 of Tabei Uplift,Tarim Basin

塔北隆起LX1区块侏罗系阳霞组、克孜勒努尔组储集层埋藏深度大、钻井少,采用地震数据体结构特征法,结合实钻资料并进行模型结构特征分析,预测研究区油气有利区。结果表明,LX1区块含油气层段存在如下特征:小时窗地震数据体结构特征异常值相对误差较大;大时段地震数据体特征异常值存在明显异常;地震道波形存在不归零的多峰现象,波形不圆滑;地震数据体结构特征异常值剖面表现为强结构异常。以地震数据体结构特征异常值为基础,将LX1区块分为4种不同类型含油气性级别,并对油气有利区进行划分:Ⅰ类非常有利区面积约6.28 km2,主要分布于区块北部;Ⅱ类有利区面积约14.26 km2,主要分布于区块南部。地震数据体结构特征异常值大且位于构造高部位的区域应是下一步滚动勘探的重点。

The Yangxia and Kezilenuer reservoirs of Jurassic in Block-LX1 of Tabei uplift in Tarim basin are of deep buried and few wellscharacteristics. Using seismic data structure characteristics,combined with drilled data and modeling structural analysis,to predict the fa-vorable oil-gas-bearing zones in the Block-LX1. Results show that such zones have characteristics as follows： the small time window seis-mic data structure characteristic abnormal value is in relative big error; the large time window seismic data structure characteristic abnor-mal value is in obvious anomaly; the seismic waveform appears in non-return-to-zero and not smooth multi-peak,and the abnormal valueprofile shows the strong structural anomalies. Base on these features,the Block-LX1 is divided into four levels in oil-gas-bearing property,and Level-I belongs to very favorable zone with an area of about 6.28 km2,distributing in northern Block-LX1; Level-II belongs to favorablezone with and area of about 14.26 km2,mainly distributing in southern Block-LX1. This paper suggests that where the abnormal value is bigand located in structural high could be taken as targets for further rolling petroleum exploration in this area.