井震联合分级控制小层对比方法

Sub-layer correlation by step control well-to-seismic integration.

1. 中国地质大学,北京100083;2. 中国石油勘探开发研究院西北分院,甘肃兰州730020

China University of Geosciences Beijing 100083,China

塔中4油田的沉积环境为海陆交互相,多变的沉积相加大了小层对比的难度,使得传统的小层对比方法不能满足储层精细描述的精度需要。为此,提出了井震联合分级控制小层对比方法,即首先在精细井震标定的基础上,利用地震资料和标准层控制,构建大套地层等时格架；然后运用相序递变规律、沉积旋回和反演结果在地层格架内对比砂层组；最后利用模型以及岩性和厚度比例对比单砂层。在塔中4油田,利用该对比方法对全区37口钻井的CI油组的4个砂组33个单砂体进行了小层对比与划分,确立了全区砂层组及其单砂体小层的合理对比方案,建立了小层划分数据表。

The sedimentary environment in Tazhong 4 oilfield is the paralic facies,which makes the sub-layer correlation very difficult, and the resolution of the traditional correlation methods cannot sat-isfy the requirement of fine reservoir description.So the sub-layer correlation by step control well-to-seismic integration is proposed. First,based on fine well-to-seismic calibration,isochronal layer structure was established through seismic and datum bed control; Then,the sand sets were correlated in stratum framework by using phase sequence grading rules,sedimentary cycles and inversion re-sults;Finally,single sand bodies were correlated by using model, lithology and thickness ratio.In Tazhong 4 oilfield,33 single sand bodies from 4 sand sets in CI oil set of 37 wells were correlated and delineated through this method.On the basis of this,a suitable correlation scheme and a sub-layer delineation data sheet are estab-lished.