鄂尔多斯盆地台缘带下古生界碳酸盐岩储层预测与综合评价

Carbonate Reservoir Prediction and Estimation about Lower Paleozoic Platform Margin Belt in Ordos Basin

区域甩开钻探揭示,鄂尔多斯盆地天环北地区台缘带奥陶系发育有利的礁滩孔隙型储层和岩溶洞穴型储层,但也面临着成藏条件复杂、深层地震资料内幕成像差、储层非均质性强等勘探难点。为了开辟鄂尔多斯盆地勘探新领域,加大了物探攻关的力度,重点开展了综合静校正、多域去噪和叠前偏移等处理技术研究,提高了奥陶系内幕成像的精度。储层预测在有利沉积相带研究的基础上,加强了地震反射模式分类和属性分析技术应用,并探索应用碳酸盐岩储层叠前含气性检测技术,综合评价有利储层发育区1218km2。建议完钻的风险探井在克里摩里组获得新发现,再次证实了该区下古生界具有良好的勘探前景。

Drilling and exploration show that favorable reef-pore and karst-cave reservoirs developed in Ordovician of the platform margin belt in northern Tianhuan area, Ordos Basin. However, it is faced with such difficulties as complicated reservoir-forming conditions, poor seismic inside imaging, and strong reservoir heterogeneity. In order to open up new areas of exploration, this paper focuses on static correction, multi-domain denoising and prestack migration and other processing techniques to improve the Ordovician inside imaging accuracy. Seismic reflection pattern classification and attribute analysis techniques are enhanced, and the direct gas detection method about prestack carbonate reservoirs prediction is explored and applied, based on the study on favorable sedimentary facies belt. 1218 square kilometers of favorable reservoir development areas are evaluated comprehensively. New discovery is made in Kelimoli Formation of one exploration well confirms broad exploration prospects in the area once again.