水平井开发中的低级序断层精细解释

Detailed interpretation of lowgrade faults in horizontal well exploitation

（中国石油大学（华东）地球资源与信息学院，山东东营257061）

College of Geo-resources and Information, China University of Petroleum (East China), Dongying 257061, China

低级序断层对油气水的分布和油田开发中后期剩余油的富集起控制作用，水平井开发的目的是为了开采剩余油，提高油气采收率。设计水平井时需要对断层进行精确定位，以确定合适的水平井轨迹。以地震资料为依据，结合地质信息、钻井资料、钻井油气采收信息，利用地震剖面解释技术、相干体解释技术、可视化解释技术以及钻井解释结果、油水关系和油气采收信息等，对L1油田断块油藏的低级序断层进行了解释和验证，由此解释了井资料显示的油气水分布矛盾、油井实际产量与预测产量的矛盾。据此设计的多口水平井投产后，平均日产油量比常规定向井增加了2～4倍，大大提高了油田的产量。

Low-grade faults control the distribution of hydrocarbon and the assembling of residual oil in the middle and later stage of development. Horizontal well exploitation is to extract the residual oil and improve the hydrocarbon recovery. Faults should be accurately identified during the design of horizontal well to set a suitable well trace. Based on seismic data, geological information, drilling data and recovery information and using drilling interpretation result, oil/water relationship and hydrocarbon recovery information, the seismic profile interpretation technique, coherent body interpretation technique as well as visualization interpretation technique, we interpreted and verified the lowgrade faults of fault block reservoir at L1 oilfield. On the basis of this, we interpreted the inconsistent distribution of oil/water/gas displayed on logging data and the inconsistency between actual output and predicted producibility. The average daily oil production level of the horizontal wells designed according to the interpretation is two to four times than that of conventional deviated wells, greatly increasing the output.