调节带低级序断层特征及其对注水开发的影响

The low-grade faults characteristics and its influence on water-flooding development in accommodation zone

白青林,束青林,焦红岩,路智勇,张戈,刘中伟,刘金友,王福金

中国石化胜利油田分公司博士后流动站，山东 东营 257000 中国石化胜利油田分公司，山东 东营 257000 中国石化胜利油田分公司
现河采油厂，山东 东营 257000 4中国石化江汉油田分公司，湖北 潜江 433100

Postdoctoral Mobile Station of Shengli Oilfield Company, SINOPEC, Dongying 257000, China Shengli Oilfield Company, SINOPEC, Dongying 257000, China Xianhe Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257000, China Jianghan Oilfield Company, SINOPEC, Qianjiang 433100, China

调节带作为调节主断层应变守恒的特殊构造，内部低级序断层极其发育。它与井网的耦合关系是制约后期注水开发的重要因素。文中利用井上断点与蚂蚁属性等井震结合技术对营26调节带低级序断层进行了识别，同时用应力场数值模拟分析了低级序断层几何样式及其对注水开发的影响，发现调节带内低级序断层产状较陡，走滑性较强，封闭性较高，多围绕高级序断层尾端、转折端，以及断层交会处密集发育，平面上呈雁列式、帚状及网格状分布，剖面上则表现为阶梯状、包心菜状及梳状的组合样式。低级序断层切割注采井网沿着主断层形成的封闭—半封闭滞留区，是剩余油的富集区，高部位部署油井和低部位油井转注能有效提高采收率。

The accommodation zone is a special structure for adjusting the strain conservation of main fault, in which the low-grade faults were extremely developed. The matching relationship between low-grade faults and flooding well network is the important factor for restricting the later water-flooding development. The Ying 26 low-grade faults were identified by well-seismic combination such as well breakpoints and ant tracking properties. The geometric style of low-grade faults and its influence on water-flooding development were analyzed according to numerical simulation of stress field. It is found that the low-grade faults have sharp occurrence and strong strike-slip stress, so the fault sealing is very good. The low-grade faults were intensively developed in the end and the transition of the high-grade faults, and the intersection of at least two faults. The low-grade faults were presented in en echelon, broom-like and gridding styles in the plane. Vertically, the patterns are mainly step-like, cabbage and pectinaiton styles. It can form semi-closed to closed stagnant zone by cutting well pattern along dominant fault, which is remaining oil enrichment area. The recovery ratio can be improved by deploying production well in high position and production well turning into injection well in the low position.

10.6056/dkyqt202105018