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弹性地质学统计反演预测薄储层技术研究
PREDICTING THIN RESERVOIRS BY ELASTIC GEOSTATISTIC INVERSION
张超1 李文洁2
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作者单位:1中国石油东方地球物理公司研究院长庆分院 2西安石油大学地球科学与工程学院
中文关键字:叠前地质统计反演 低纵波阻抗 薄储层预测
英文关键字:prestack geostatistic inversion, low P-wave impedance, thin reservoir prediction
中文摘要:  鄂尔多斯盆地苏里格气田砂体薄,纵向多期叠置,横向连续性差,且多种岩性之间纵波阻抗存在较大重叠区间,为含气性预测及水平井轨迹的设计造成很大的难度。针对该问题,选取苏里格西部某区块作为研究区,在叠前反演的基础上,进一步运用弹性地质统计反演技术,细化了储层预测方法,由原来只能对大套储层预测转变为对薄储层的预测。在实际应用中,准确预测了4~8 m的薄储层,并成功地指导了水平井轨迹设计,使水平井储层钻遇率达到90%以上,显著地提高了钻井成功率。

 

英文摘要:  In Sulige gasfield of Ordos Basin, most reservoirs are composed of thin sandbody which is multiphase superimposed in vertical and has poor lateral continuity. Moreover, there is a larger overlapping interval for P-wave impedance due to various lithology existing in these reservoirs. So, it is very difficult to predict some gas-bearing properties and to design a horizontal-well trajectory. In this study, one block from western field was taken as an example. Based on prestack inversion, we applied a technology of elastic geostatistic inversion to predicting reservoirs, which might realize large suites of reservoir prediction transforming to thin-reservoir prediction. In fact, this technology was used to predict a thin reservoir with 4-8 min thickness. As a result, it guides the design of horizontal-well trajectory and makes the drilling ratio of horizontal-well reservoir reach to over 90 percent, which can obviously increase a drilling success ratio.

 

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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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