自然伽马反演在鲕滩储层预测中应用
|
摘要
以往川东地区飞仙关组鲕滩储层预测,主要作速度反演寻找低速异常,取得了一定的效果。但随着勘探的深入,认识到低速异常不一定真正是鲕滩储层的地震响应。当飞三段~飞一段地层中,局部发育有泥质灰岩或泥质含量过高的地层,这也可能造成地层速度降低,如果只靠速度反演,就可能造成误解。针对该情况,采用伽马反演来剔除因泥质含量增加形成的低速异常现象,再结合速度反演,较准确地预测出在平面上双家坝构造飞仙关组鲕滩储层厚度主要分布在20~40m,东部及南部为有利区,为下一步勘探提供了可靠的资料。
The prediction for oolitic reservoirs in Feixianguan Formation is used to look for low velocity anomaly data set in the eastern Sichuan.However,low velocity anomalies are not always the seismic responses from oolitic reservoirs.If there are gypsum or thick marlite intervals between the strata of T1f3 and T1f1,low velocity anomalies may appear.To cope with this problem,gamma inversion is used to rule out the low velocity anomalies that caused by increment of shale content,and then the distribution of oolitic beach of Feixianguan Formation can be predicted in SJB area in combination with velocity inversion.And desired results are yielded.
The prediction for oolitic reservoirs in Feixianguan Formation is used to look for low velocity anomaly data set in the eastern Sichuan.However,low velocity anomalies are not always the seismic responses from oolitic reservoirs.If there are gypsum or thick marlite intervals between the strata of T1f3 and T1f1,low velocity anomalies may appear.To cope with this problem,gamma inversion is used to rule out the low velocity anomalies that caused by increment of shale content,and then the distribution of oolitic beach of Feixianguan Formation can be predicted in SJB area in combination with velocity inversion.And desired results are yielded.
引文
[1]刘划一,张静,洪海涛.四川盆地东北部长兴组飞仙关组气藏形成条件研究[J].天然气勘探与开发,2001,24(2):30-38.
[2]庄成三,王培强,肖姹莉,等.用地震资料预测油气的模式识别方法的一些技术问题[J].石油物探,1995,34(3):69-77.
[3]张红,聂荔,林刚.川东地区石炭系储层横向预测的影响因素[J].石油物探,1997,36(4):99-103.
[4]王延光.储层地震反演方法以及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303.
[2]庄成三,王培强,肖姹莉,等.用地震资料预测油气的模式识别方法的一些技术问题[J].石油物探,1995,34(3):69-77.
[3]张红,聂荔,林刚.川东地区石炭系储层横向预测的影响因素[J].石油物探,1997,36(4):99-103.
[4]王延光.储层地震反演方法以及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303.
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