曙光地区杜家台油层薄砂岩高精度预测

针对曙光地区杜家台油层扇三角洲前缘薄砂岩预测难的问题,应用地震波形指示模拟技术开展了薄砂岩高精度预测。结果表明,地震波形指示模拟自然电位结果识别薄砂岩的精度可达到3.0～8.0 m,反演吻合率达到81.5%;明确了曙光地区杜二段扇三角洲前缘薄砂岩的展布特征,精细识别出杜130—杜144、杜300—曙100、曙66—曙古19—曙175井区3个扇三角洲前缘河口坝和席状砂微相薄砂岩发育区,面积合计达26.0 km²,指导部署2口探井,均获得工业油气流,为曙光地区增储稳产奠定了基础。地震波形指示模拟技术对曙光地区薄砂岩预测以及岩性油气藏勘探具有重要的意义。

High-precision Prediction of Thin Sandstones in Dujiatai Oil Layer of Shuguang Area

In order to solve the problem that it is difficult to predict the thin sandstones in the fan delta front facies of Dujiatai oil layer of Shuguang Area, the high-precision prediction of thin sandstones was carried out by using seismic waveform indication simulation technology. The results show that the accuracy of identifying thin sandstones by self-potential (SP) from seismic waveform indication simulations can reach 3.0-8.0 m and the inversion coincidence rate can reach 81.5%; the distribution characteristics of thin sandstones in the fan delta front facies of the Du 2 Member in Shuguang Area are clarified. Three thin sandstone development areas of fan delta front mouth bar and sheet sand microfacies (Du 130-Du 144, Du 300-Shu 100, Shu 66-Shugu 19-Shu 175 well areas) are identified, with a total area of 26.0 km². The research results have guided the deployment of two exploration wells, both obtaining industrial oil and gas flow, which laid the foundation for further improvement of reserves and productivity in Shuguang Area. The seismic waveform indication simulation technology is of great significance for thin sandstone prediction and lithologic reservoir exploration in Shuguang Area.