利用地震波场参数探讨岩性非均质的分布

RESEARCH ON THE DISTRIBUTION OF LITHOLOGIC HETEROGENEITY USING SEISMIC WAVE FIELD PARAMETERS

本文利用 Ｓ Ｔ Ｍ 地区二维地震资料中提取中油组的主振幅参数与岩性参数进行相关拟合，并依据岩性分析资料和调谐厚度将其划分为三个区带：低振幅带、正常振幅带和异常高振幅带。综合分析油气测试结果、岩性统计资料后认为，其中的异常高振幅带是结构疏松、孔隙发育、连通性好的均质储层分布区，并从合成记录和理论模型正演结果对上述结论进行了证实。结合沉积相分析成果，将该地区的岩性非均质划分为三种类型，后期在优质储层均质区块中钻探获得了高产工业油气流，从而证实了从地震角度划分岩性非均质分布，不仅是可行的，而且是准确的。该方法不仅拓宽了地震资料的应用范围，也为寻找有利油气富集区提供了一种行之有效的方法。

In this paper we introduce the extracting of main amplitude parameter for Zhongyou Group from 2D seismic data in STM region and the correlation between these parameters and lithologic characters. And thus STM region could be divided into three zones:low amplitude zone, normal amplitude zone, and abnormal high amplitude zone by lithologic data and modulation thickness. The authors think that the abnormal high amplitude zone is a homogeneous reservoir distribution zone with loose structure, well developed pore and well connectivity after analysing both oil gas testing data and lithologic statistical data. This is verified by synthetic records and forward modelling. Combining with sedimentary facies analyses, we divide the lithologic heterogeneity of STM region into three types. Highly yielding oil and gas streams has been acquired in the delineating potential zone at the late log exploration. This verifies that lithologic eletection from seismology is feasible and correct. The methods not only expand the application of seismic data of oil and gas, but also provide an effective way to find new enrichment zones.