苏里格气田全数字地震勘探技术及应用
|
摘要
苏里格气田是迄今为止中国陆上发现的最大天然气田,该气田的主要含气目标层系内,有效储层(气层)厚度小、横向变化快,钻井风险很大。从有效储层的地质及地球物理特征分析出发,论证了有效储层地震预测的思路和可行性,从而有针对性地提出了全数字地震野外资料采集方法。在资料处理中,强调对叠前道集动力学特征的保持性处理,获得了可用于叠前反演输入的高品质CDP道集。在此基础上,利用叠前反演和AVO分析预测天然气有效储层。2006年在苏里格气田100km2的范围内,通过全数字地震的配套技术,共提供开发井位30口,钻探评价结果显示,钻井成功率由以前的60%提高到90%,气层钻遇率达到100%,极大地提高了气田开发的经济效益。
Sulige gasfield is the largest onshore gasfield discovered in China so far, in which the main gas-bearing target strata feature in thin effective reservoirs (gas reservoirs), rapid longitudinal variation, and high risk of drilling. The thought on seismic prediction of effective reservoirs and its feasibility are demonstrated in the thesis based on analyzing the geological and geophysical characteristics of them. A full digital field data acquisition approach is proposed. It is emphasized that the dynamic characteristics of prestack gathers should be maintained during data processing. High-quality CDP gathers are obtained, which can be used for prestack inversion. Then restack inversion and AVO analysis are applied to predict effective gas reservoirs. In 2006, 30 wells were developed in the range of 100km2 of the gas field, based on applying systematic full-digital seismic techniques. Evaluation results show that the drilling success rate rises to 90% from 60%, gas zones drilled reaching 100%. This greatly improves the economic benefit of gasfield development.
Sulige gasfield is the largest onshore gasfield discovered in China so far, in which the main gas-bearing target strata feature in thin effective reservoirs (gas reservoirs), rapid longitudinal variation, and high risk of drilling. The thought on seismic prediction of effective reservoirs and its feasibility are demonstrated in the thesis based on analyzing the geological and geophysical characteristics of them. A full digital field data acquisition approach is proposed. It is emphasized that the dynamic characteristics of prestack gathers should be maintained during data processing. High-quality CDP gathers are obtained, which can be used for prestack inversion. Then restack inversion and AVO analysis are applied to predict effective gas reservoirs. In 2006, 30 wells were developed in the range of 100km2 of the gas field, based on applying systematic full-digital seismic techniques. Evaluation results show that the drilling success rate rises to 90% from 60%, gas zones drilled reaching 100%. This greatly improves the economic benefit of gasfield development.
引文
[1]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993
[2]殷八斤.AVO技术的理论与实践[M].北京:石油工业出版社,1995
[3]史松群,等.苏里格气田低阻抗砂岩储层的AVO含气性预测研究[J].石油地球物理勘探,2003,38(1):74～83
[4]胡德绥.弹性波动力学[M].北京:地质出版社,1989
[2]殷八斤.AVO技术的理论与实践[M].北京:石油工业出版社,1995
[3]史松群,等.苏里格气田低阻抗砂岩储层的AVO含气性预测研究[J].石油地球物理勘探,2003,38(1):74～83
[4]胡德绥.弹性波动力学[M].北京:地质出版社,1989
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心