地震波形指示反演在东营凹陷王家岗地区沙四上亚段滩坝砂的应用

发布时间：2018-10-21 18:57

【摘要】：以东营凹陷王家岗沙四上亚段滩坝砂为例,在层序地层格架建立的基础上,利用沉积学原理,基于贝叶斯理论将地震、测井和地质统计学信息融合为地层模型参数的后验概率分布,采用Metropolis-Hastings抽样算法对后验概率分布随机抽样,获得反演解,从而预测有利滩坝相带。结果表明:东营凹陷王家岗地区沙四上亚段低位域发育滩坝砂,其中准层序组2沉积时期以坝砂为主,砂体厚且横向分布稳定,而准层序组1和准层序组3沉积时期滩砂和坝砂间互发育,砂体厚度相对较小;湖侵域和高位域主要发育碳酸盐岩滩坝,滩坝砂零星状分布。该方法体现了相控的思想,预测结果更符合地质规律,在东营凹陷沙四上亚段滩坝储层预测中取得了较好的效果,为同类型储层预测提供了有利支持。
[Abstract]:Taking the beach bar sand of Wangjiagangsha 4 upper submember in Dongying sag as an example, based on the establishment of sequence stratigraphic framework, using the principle of sedimentology, based on Bayes theory, the earthquake can be obtained. The log and geostatistical information are fused to the posterior probability distribution of the formation model parameters. The inversion solution is obtained by random sampling of the posterior probability distribution using Metropolis-Hastings sampling algorithm, and the favorable beach and dam facies zone is predicted. The results show that the sandbar sand is developed in the lower submember of the upper part of Sha 4 in Wangjiagang area, Dongying Sag, in which the secondary sequence formation is dominated by the bar sand in the sedimentary period, and the sand body is thick and the transverse distribution is stable. However, during the sedimentary period of the first and third quasequence groups, the sandbody thickness is relatively small, and carbonate beach and dam are mainly developed in the lacustrine transgression region and the high position area, and the sand is distributed sporadically in the beach and dam area. This method embodies the idea of facies control, and the prediction results are more in line with the geological rules. The method has achieved good results in the prediction of beach and dam reservoirs in the upper submember of Sha 4 in Dongying depression, and has provided favorable support for the prediction of the same types of reservoirs.
【作者单位】：中国石油大学地球科学与技术学院;山东省油藏地质重点实验室;中国石油新疆油田分公司石西油田作业区;
【基金】：国家重大科技专项(2017ZX05009-001) 国家自然科学基金项目(41672129)
【分类号】：P618.13;P631

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