Title

Reservoir prediction of fan delta in Wuliji slope belt of Chagan Sag

作者

肖斌杨小波刘建军李洪波刘云余少勇2

单位

中国石化中原油田分公司物探研究院，河南濮阳 457001 中国石化中原油田分公司勘探开发研究院，河南濮阳 457001

Organization

Geophysical Research Institute, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

摘要

查干凹陷乌力吉斜坡带发育多个砂砾岩扇体，精细刻画出扇体分布及有利相带展布，是实现油气勘探突破的关键。但运用常规的地球物理技术难以准确判别扇体砂泥边界，另外扇根砂砾岩与扇中细砂岩、粉砂岩之间的界限也无法识别。文中研究主要是考虑到地震横向分辨率远大于纵向分辨率的特点，综合运用地震属性提取技术、分频解释调谐体分析技术和同频体分析技术等，对乌力吉斜坡带力1块巴二段2—3砂组砂砾岩储层开展了精细预测。通过地震属性技术，确定中等振幅对应着扇中沉积，强振幅可以识别扇根；通过分频解释调谐体技术，确定出关键频率为47 Hz，在此基础上开展了47 Hz同频体分析，最终圈定了扇体平面分布范围，以及各亚相之间的界限。同时，还利用频变技术，对巴二段2砂组的各小层进行了精细预测及刻画，预测了岩性、预报砂体和产生响应的小砂层的分布，达到识别薄层分布的目的。

关键词储层预测；分频技术；扇三角洲；乌力吉斜坡带

Abstract

There are many glutenite fan bodies developed in Wuliji slope belt of Chagan Sag. The key to achieve a breakthrough in oil and gas exploration is to fine depict the distribution of fan bodies and favorable facies distribution. However, the use of conventional geophysical techniques is difficult to accurately determine the boundaries between sand and mud of fan bodies. In addition, the boundary between glutenite of root fan and fine sandstone and the siltstone of middle fan is difficult to identify. Mainly considering the characteristics of the lateral resolution greater than the vertical resolution of seismic data and comprehensively using the seismic attribute extraction, spectrum?鄄decomposition tuning body and single frequency body analysis techniques, this paper predicts the distribution of glutenite reservoir of K1b22+3 subbed in Block Li 1 of Wuliji slope belt. Based on seismic attribute technique, the moderate amplitude corresponding to the middle fan is determined and the high?鄄amplitude fan can be used to identify the root fan. By using spectrum?鄄decomposition tuning body technique, the critical frequency of 47Hz is determined. Based on this, 47 Hz frequency is analyzed. At last, the plane distribution range of fan body and the boundary of subfacies are delineated. At the same time, using the frequency conversion technique, the plane distribution of each sand group of K1b22 is fine predicted and characterized. The lithology and plane distribution of thin sand are predicted, achieving the purpose of identifying the distribution of thin reservoir.

关键词：

储层预测; 分频技术; 扇三角洲; 乌力吉斜坡带;

Keywords:

reservoir prediction; frequency division technology; fan delta; Wuliji slope belt;

基金项目

DOI

10.6056/dkyqt201502005

查干凹陷乌力吉斜坡带扇三角洲储层预测