东辛油田永3断块低级序断层特征及其对注水开发的影响

arewell fault characteristics and its influence on water injection development of Yong 3
Fault Block in Dongxin Oilfield

侯甫¹ 杨少春¹ 路智勇 2 王欣² 赵娟³ 文璐¹

1．中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国石化胜利油田分公司东辛采油厂，山东 东营 257094 中国石油西南油气田分公司川中油气矿，四川 遂宁 629000

School of Geosciences, China University of Petroleum, Qingdao 266580, China Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257094, China Chuanzhong Petroleum Resource Plant, Southwest Oil and Gas Company, CNPC,Suining 629000, China

东辛油田永3断块构造复杂，低级序断层发育，沙河街组沙二段油藏开发后期剩余油局部富集，注水开发效率低。文中基于蚂蚁追踪技术的三维地震解释和局部构造应力场分析，阐明了永3断块断层规模、封闭性及组合样式，揭示了低级序断层对注水开发的影响。研究认为：平面上永3断块低级序断层主要表现为“y”型、反“y”型、地堑型和地垒型，在剖面上主要表现为帚状、平行状和放射状等多种断裂组合形式；该区低级序断层主要为四级断层和五级断层，其中四级断层控制剩余油分布，而五级断层影响注采井网部署。低级序断层封闭性好，具有渗流遮挡作用；不同的断层组合样式形成不同的剩余油区，局部地区注采关系不匹配。低级序断层发育是导致永3断块区注采矛盾严重、开发效率低的重要因素。

Yong 3 Fault Block has complex structural faults with quantity farewell faults. During the later period of development, the remaining oil in Shahejie is concentrated and has low efficiency of the flood development. Based on the triaxial seismic interpretation of ant tracking and the datum of partly structural stress field, the analysis shows that the scale of fault, fault closure property and the combination style of the fault affect the flood development. There are multiplex combination style configurations in the plane and cross section of the farewell fault, such as y type, graben type, horst type, brush structure, parallel structure and so on. The farewell faults in Yong 3 Fault Block are mainly divided into two groups: the fourth grade and the fifth grade. The fourth grade faults control the distribution of remaining oil and the fifth grade faults affect the injection-production well deployment. Besides, the farewell fault has great closure property to keep out the fracture flow. Different fault combination style has different remaining oil field, which leads injection-produciton relationship mismatched in part areas. The farewell faults in Yong 3 Fault Block are the most important factor which leads to the grave injection-production contradictory and lower development efficiency.

10.6056/dkyqt201504018