陆相薄互层油藏多波联合属性分析与油气检测

MULTI-COMPONENTS SEISMIC JOINT ATTRIBUTES ANALYSIS AND HYDROCARBON IDENTIFICATION IN TERRESTRIAL INTERBEDDED THIN RESERVOIR

多波多分量地震能同时得到纵波和转换横波数据资料,所提供的地震信息也成倍地增加。由于岩性和流体的敏感性在纵波、转换横波特征上的差异,二者的地震属性参数出现不同的异常反映;因此,研究纵、横波联合属性的相对变化,可以降低单一纵波属性分析的多解性,得到更为可靠的地下岩性和流体变化的信息。在利用模型正演方法进行纵波、转换横波联合属性理论模拟基础上,对多波属性识别陆相薄互层油藏的可行性、可靠性进行分析,以指导实际资料的应用,在胜利油田垦71区块薄互层砂岩储层及油气预测中取得了较好的应用效果。

Multicomponents seismic survey receives Pwave and PSV converted wave data simultane ously, and the seismic information received are doubled. Pwave and PSV converted wave have differ ent sensitivity to lithology and fluid that causes seismic attribute anomalies. Therefore, by studying the joint attributes of Pwave and PSV wave, ambiguity in simple Pwave interpretation will be re duced, and more reliable litholgy and fluid information obtained. Using Multicomponents forward modeling of seismic data, the paper discussed the feasibility and reliability of hydrocarbon identifica tion by multicomponents seismic joint attributes in terrestrial interbedded thin reservoir in the Ken 71 area of the Shengli oilfield. The results are proved useful for oil and gas prediction.