塔里木盆地玉北地区断裂特征及控制作用

Fracture characteristics and control action on hydrocarbon accumulation in Yubei Area of Tarim Basin

杜永明 余腾孝 郝建龙 邱华标

中国石化西北油田分公司工程监督中心，新疆 轮台 841600 中国石化西北油田分公司勘探开发研究院，新疆 乌鲁木齐 830011

Engineering Supervision Center, Northwest Oilfield Company, SINOPEC, Luntai 841600, China Research Institute of Exploration and Development, Northwest Oilfield Company, SINOPEC, Urumqi 830011, China

塔里木盆地玉北地区经历过多期构造运动，构造复杂，断裂带发育。结合新三维地震和区域地质资料进行综合分析，结果表明，该地区断裂系统样式多，具有多期形成及继承叠加改造和平面展布分区分段的特征。中寒武统地层之下断裂样式多为基底卷入型，之上多为沿中寒武统膏盐层的盖层滑脱型，主要形成于加里东和海西期，喜山期活动较弱；自东向西断裂活动、期次有差异，东部断褶区加里东中晚期活动强、幅度大，西部海西晚期活动强，且在玉北7、玉北1及玉东3断裂带形成2期断裂叠加区；断裂带是油气运聚的最有利方向，控制储层发育及油气聚集。该研究对指导玉北地区油气勘探具有重大意义。

Yubei Area of Tarim Basin experienced multiple tectonic movements. Structure is complex and fracture zones develop. Combined with the new 3D seismic data and regional geology data, the analysis results show that the fracture system has the characteristics of diverse patterns, multiple epochs, inheritance superposition reconstruction, plane distribution and segmentation along strike. The fracture is basement-involved pattern below the Middle Cambrian formation and above Middle Cambrian formation, the fracture is cover-slipped pattern along Middle Cambrian salt layer, which mainly form in Caledonian and Hercynian. Activity in Hercynian is weak, and fracture activity and period are different from east to west. Activity is strong and amplitude is large during Middle-Late Caledonian in the eastern fault and fold zone. But activity is strong during Late Hercynian in the western region. The two period fractures are overlapped in Yubei 7, Yubei 1 and Yudong 3 fault zones. Fracture zones control reservoir development, which is the most favorable direction of hydrocarbon migration and accumulation. This study has great significance for guiding the hydrocarbon exploration in this area.

10.6056/dkyqt201302009