三塘湖盆地芦草沟组页岩油测井评价技术进展

三塘湖盆地芦草沟组页岩油储集层岩性复杂、储集空间类型多样、源储配置关系不明,甜点特征及其分布规律不清。通过岩心刻度测井,利用测井资料对总有机碳含量和生烃潜量进行计算和评价,以点带面开展盆地内优质烃源岩的分类评价;利用核磁共振测井资料确定合理的T₂截止值和起算时间,以不同级别和类型的孔隙开展有效储集层及含油性评价,建立了有效储集层的分类及下限标准;通过多井对比和井震结合,厘清了源储间互分布、纹层状发育的特点,明确了甜点的测井响应特征及纵向上的分布规律,为页岩油甜点的预测和有利区带的优选提供了依据,实现了条34块和牛圈湖区块页岩油的产能建设和效益动用。

Progress of Well Logging Evaluation Techniques for Shale Oil of Lucaogou Formation in Santanghu Basin

The shale oil reservoirs of the Lucaogou formation in the Santanghu basin have complex lithologies, various types of reservoir space, and unknown source-reservoir configuration relation, thus the characteristics and distribution rule of sweet spots are unclear. Through calibrating well logging data by core, the well logging data are used to calculate and evaluate the total organic carbon content and hydrocarbon generation potential, then high-quality source rocks in the basin are the classified and evaluated. Reasonable T₂ cutoff value and starting time are determined by NMR logging data, the effective reservoirs and oil-bearing property are evaluated according to different grades and types of pores, and the classification and lower limit standards of effective reservoirs are established. Through multi-well comparison and logging-seismic combination, the mutual distribution between source and reservoir and the characteristics of lamellar development are clarified, and the well logging response characteristics and longitudinal distribution of sweet spots are defined. The research results provide a basis for the prediction of shale oil sweet spots and the optimization of favorable zones. The shale oil production capacity construction and efficient producing in Block Tiao 34 and Block Niujuanhu have been realized.