高邮凹陷断层—岩性油气藏勘探技术与实践

江苏油田高邮凹陷地震资料品质受构造破碎、野外地表复杂等因素影响,且目标砂体厚度往往小于地震垂向分辨率,从地震剖面上无法直接识别单砂体,利用现有地震资料提高储层预测精度难度很大。通过对高邮凹陷地质背景的分析和戴南组高分辨率层序地层学研究、沉积背景分析、沉积砂体发育特征与控砂机制研究,综合运用地质、测井、钻井、地震资料,建立了一套断层—岩性油气藏勘探方法:按照定性到半定量—定量化储层预测思路,利用叠前地震反演、地震AVO正演及属性分析等特色技术判断砂体发育区,开展定量储层厚度预测,最终综合定性、定量研究成果提高储层预测精度,提供有利钻探目标。勘探实践的高成功率充分说明该方法在断层—岩性油气藏勘探中行之有效。

Fault-Lithologic Reservoir Exploration Technology and Practice in Gaoyou Sag

In Gaoyou sag of Jiangsu Oilfield, seismic data quality is influenced by structural factors, such as structure crushing and complex field surface conditions, and the thickness of target sand bodies is often less than the vertical seismic resolution. So single sand body cannot be directly identified from seismic section, and it is very difficult to improve reservoir prediction accuracy using existing seismic data. Through the analysis of geological background in Gaoyou sag and the high resolution sequence stratigraphy research, the analysis of sedimentary background, sedimentary sand body development and sand control mechanism research of Dainan Formation, the integrated use of geological, well logging, drilling and seismic data, a set of fault-lithologic reservoir exploration method is established： according to the qualitative and semi-quantitative and quantitative reservoir prediction, use prestack seismic inversion, AVO forward modeling and seismic attribute analysis technology to determine sand body development area, carry out quantitative reservoir thickness forecast, finally integrate qualitative and quantitative research results to improve reservoir prediction accuracy, and provide favorable drilling targets. High success rate proves that the method is effective in fault-lithologic reservoir exploration.