【摘要】 塔河油田奥陶系岩溶洞穴系统内具有较大的油气资源。基于三维地震资料、地震属性提取、岩心资料及钻井资料,对地下岩溶洞穴系统、古地貌和古水文系统进行精细刻画,探讨水文地貌对洞穴发育的控制作用,研究结果表明:1东部主体区古地貌处于岩溶高原、岩溶斜坡区,以峰丛等高幅差地貌为主,地表水系垂向侵蚀作用强烈,大部分转入地下;西部区位于岩溶盆地,以低幅度溶丘为主,地形平缓,水系展现出大量蛇曲特征,以水平溶蚀为主。2东部主体区洞穴网络主要表现为单支状、树枝状,局部发育网络状洞穴,洞穴具有发育规模大、埋藏深、连通性较好的特征;西部地区洞穴主要表现为孤立状,未形成连续的洞穴网络,洞穴具有发育规模小、埋藏浅、连通性较差的特征。3综合水文地貌发育特征,提出塔河地区水文地貌控制下的岩溶洞穴发育模式,为下一步储层预测和勘探实践提供理论借鉴。更多还原

【Abstract】 Giant oil and gas resources have been found in the Ordovician karst cave system of Tahe Oilfield.Based on3 D seismic data,seismic attribute extraction,core and drilling data,the underground karst cave system,ancient landform and paleo-hydrology system were finely described to explore the control effect of hydrogeomorphology on the development of cave development.The results show that in the east major area,ancient landform is located on karst plateau and karst slope,and dominated by the geomorphology with high amplitude difference,such as peak cluster.Surface water has strong vertical erosion effect,most of which flows to the underground.In the west area,ancient landform is located in the karst basin,dominated by low-amplitude karst hill,where the terrain is flat and water system mostly presents meandering characteristics,dominated by lateral erosion.In the east major area,the caves network is mainly shown as single-branch shape and dendritic shape;network caves are detected in local areas,characterized by largescale development,great buried depth and good connectivity.In the west area,the caves are separated without forming a connected cave network,characterized by small development scale,shallow buried depth and poor connectivity.In combination with hydrogeomorphologic characteristics,the karst cave development model is proposed under the control of hydrogeomorphology in Tahe Oilfield,providing a theoretical reference for further reservoir prediction and exploration practice.更多还原