东营凹陷复杂岩性区浊积岩含油性预测方法研究——以史南—郝家地区为例

东营凹陷古近纪沙三段沉积时期发育大量的浊积岩油气藏,但由于浊积岩沉积区岩性构成和波阻抗特征十分复杂,加之浊积岩发育范围广、埋藏深、厚度薄等特点,使得常规属性和叠后反演难以解决储层识别和量化预测问题。针对这些问题,选取史南—郝家地区作为研究区,应用井和地质资料,进行岩石物理分析,找出复杂岩性区内对含油浊积岩响应良好的弹性参数；以叠前同时反演为基础,利用叠前地质统计学反演清晰刻画含油浊积岩纵、横向变化特征；利用地质统计学协模拟方法预测孔隙度,圈定有利含油浊积岩储层范围。研究结果对东营凹陷含油浊积岩储层的勘探有借鉴和参考意义。

In Dongying Sag,amount of turbidite reservoirs are developed in member 3 of Shahejie formation in Paleogene Period.However,conventional methods cannot meet the demands of turbidite reservoir recognition and quantitative prediction because of the complex lithological composition and wave impedance characteristics of turbidite,as well as its wide distribution,large burial depth and thin layer thickness.To solve the problem,taking Shinan-Haojia Area as example,by combining well data,geological data with petrophysical analysis,we found the elastic parameters that correspond well with the oil-bearing turbidite in the complex lithological area.On the basis of prestack simultaneous inversion,the lateral and longitudinal variation of the oil-bearing turbidite is characterized by pre-stack geostatistical inversion.Moreover,the porosity is predicted by geostatistical simulation,and the distribution of favorable oil-bearing turbidites is verified,which provides effective guidance for the exploration of turbidite reservoirs in Dongying Sag.

国家科技重大专项“高精度地震勘探关键技术攻关与系统配套”项目(2011ZX05006-002)资助。