为了解决鄂尔多斯盆地东北部大牛地气田奥陶系顶部受太原组煤层影响地震分辨率不足,在现有层位解释基础上古地貌恢复精度不足的问题,以大牛地气田为研究对象,基于钻井、测井、地震等资料,结合区域沉积构造背景,利用叠后解释性处理技术与多参数反演技术精细追踪主要地质界面,进行岩溶古地貌恢复并划分岩溶优势区,分析其对研究区岩溶储层发育的影响。研究结果表明：① 基于多参数反演的岩溶古地貌恢复技术可以将残留厚度预测误差控制在4 m之内;② 根据岩溶古地貌单元渗流特征,结合气层厚度 — 风化壳残余厚度相关性及产能井分布对古地貌进行分区评价,残余厚度小于58 m为相对岩溶有利区。结论认为,基于多参数反演的岩溶古地貌恢复技术有效提高了关键地质界面的解释精度,进而提高古地貌恢复准确性,有助于岩溶储层分布研究,为下一步勘探开发部署提供了支撑。
Abstract
The top Ordovician, Daniudi gasfield, northeastern Ordos Basin, possesses poor seismic resolution which is influenced by coal seams of the Taiyuan Formation, resulting that paleogeomorphic restoration is not accurate only dependent on its seismic interpretation. So, in the light of drilling, well logging and seismic data, integrated with regional, depositional and structural setting, the key geological interface was explored precisely for this field from two technologies, such as post-stack interpretation and multi-parameter inversion. Several karst predominance areas were pointed out through karst restoration. Finally, the effect on the extension of karst reservoirs was analyzed. Results show that (i) for this sort of reservoirs, the paleogeomorphic restoration based on multi-parameter inversion should be kept the predicted error of residual thickness no higher than 4 m; and (ii) based on percolation of paleogeomorphic units, combined one relation of gas layer thickness to residual weathering-crust thickness with productivity-well distribution, the evaluated zonal paleogeomorphology suggests one area with the residual thickness less than 58 m comparatively favorable for karst extension. In conclusion, the paleogeomorphic restoring technology based on multi-parameter inversion may effectively improve the interpretation for the interface to further raise the restoring precision, which is conducive to clarifying the distribution of karst reservoirs and offering assistance for the next exploitation.
关键词
鄂尔多斯盆地 /
大牛地气田 /
多参数反演 /
古地貌恢复 /
岩溶优势区
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Key words
Ordos Basin /
Daniudi gasfield /
Multi-parameter inversion /
Paleogeomorphic restoration /
Karst predominance area
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