利用断层模型约束反演技术进行储层预测

本文通过井震结合,建立了喇嘛甸油田北北二区块的构造模型,具体作法为:①利用井分层数据产生深度域顶部层面,应用地震构造解释产生时间域构造层面,通过合成记录建立油层组级别的速度场,并将深度域构造层面数据进行转换得到时间域数据;②以地震构造层面为趋势约束,最终得到时间域的各油层组构造层面;③对断层与断层、断层与层位进行交切,通过准确定义断层关系以及断层与层位之间的关系,使断层上、下盘地层的过渡符合实际地质情况。在构造模型的基础上,利用断层模型约束进行地质统计学反演,经与测井解释结果对比,砂体预测可信度明显提高。利用该预测结果落实了井网控制程度较低区域的断层附近砂体分布,对断层附近水平井设计提供了依据。

Reservoir prediction using inversion constrained by faults model

Using logging data and seismic data we build a structural model of the second block in the north LMD field in this study.The concrete steps are as follows: ①The top horizon in depth domain is built by geological divided layers from well data;the structural horizons in time domain is built using seismic interpreted structures;pay zone set-level velocity field is established by synthetic seismograms;and finally structural horizon data in the time domain are converted from that of depth domain.②With the restriction of seismic structural horizons,structural horizons in time domain of all pay zone sets are obtained.③The relationships among faults and horizons,and their distribution have been defined accurately by fault interpretation,so the transition of upper wall and foot wall formations accords with actual geologic situation.On the basis of structural model,the geostatistical inversion constrained by faults model is conducted.Comparing with the logging data interpretation,the reliability of sand bodies prediction with this inversion improves significantly.Using reservoir prediction results by this method the sand body distribution near the faults in sparse well spacing area has been confirmed,which guides the design of horizontal wells.