彭水区块页岩脆性与含气性定性预测

Shale brittleness and gas bearing property prediction of Pengshui block

四川盆地周缘彭水区块志留系龙马溪组页岩储层分布较稳定,对于稳定展布的页岩层,寻找高TOC、高脆性优质页岩段难度大。在精细分析该地区页岩储层岩石物理特征的基础上,综合地质、地震和测井等资料,利用叠前同步反演技术对研究区内龙马溪组高TOC、高脆性优质页岩层段进行识别。研究结果表明,常规储层预测效果明显的纵波阻抗无法有效识别高TOC、高脆性页岩;而叠前属性Vp/Vs既是高TOC的敏感参数,也是高脆性的敏感参数。利用叠前同步反演技术,得到V_p/V_s数据体,用于识别高TOC、高脆性页岩层段,进而获得优质页岩段,为优选勘探目标提供依据。

Due to the stable shale reservoir distribution of Longmaxi formation of Silurian in Pengshui block, Sichuan basin, it is dif- ficult to search high TOC, high brittleness and high quality shale member. Based on the accurate analysis of petrophysical charac- ters of shale reservoir, and combined with geologic information, seismic data and log information, prestack simultaneous inversion technique is adopted to identify high TOC, high brittleness and high quality shale member of Longmaxi formation, The research shows that, the conventional longitudinal wave impedance can＇ t effectively identify high TOC and high brittleness shale. However, prestack attribution Vp/Vs are not only the sensitive parameters of high TOC, but also the sensitive parameters of high brittleness. The Vp/Vs data obtained by prestack simultaneous inversion technique are used to identify high TOC and high brittleness shale mem- ber, furthermore, high quality shale member is obtained. The research provides basis for optimizing exploration targets.