胜利油田罗家地区泥岩裂缝油气藏地震识别与描述技术
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摘要
随着胜利油田勘探开发形势的发展 ,从过去单纯以寻找构造油气藏为主转变为现在寻找较为复杂的隐蔽油气藏为主。泥岩裂缝油气藏作为一种特殊的隐蔽油气藏类型 ,在济阳拗陷的沾化、车镇、东营等生油凹陷广泛分布 ,并有多口井获得了高产商业油流 ,具有较大的勘探潜力。本文通过对胜利油田罗家地区沙三段泥岩裂缝油气藏进行系统研究 ,划分了该区有利的沉积相带 ,认为灰质泥岩发育区易形成泥岩裂缝油藏 ;根据应力作用形式 ,划分了三种应力场 :断层应力、构造应力和地层压力 ,本文认为利用最大构造曲率法和地层异常高压预测泥岩裂缝发育段是较为有效的方法 ;总结了泥岩裂缝油气藏在正极性剖面上对应负反射系数的地震反射特征和低速度特征 ,应用正演模型技术 ,总结了不同地质条件下泥岩裂缝的振幅、频率特征 ;提出了泥岩裂缝储层地球物理特征重构技术 ,利用本区具有代表性的浅侧向电阻率和 2 .5 m电阻率曲线对泥岩裂缝油气藏进行了地球物理特征曲线的重构 ,在实际资料的运用过程中取得了较好的地质效果。
With the development of E & D circumstances in Shengli oilfield,looking for oil has been transformed from formerly mainly looking purely for structural reservoir into mainly looking for more sophisticated subtle reservoir now.As a kind of special subtle reservoir type,shale-fractured reservoir is widely distributed over Zhanhua,Chezhen,Dongying source depression in Jiyang Depression,in which commercial oil with high production has been obtained in multiple well,and has a great prospecting potential.Through systematic study of shale-fractured reservoir in Sasan section (S3) of Luojia area of Shengli oilfield,the paper divided the area into favorable sedimentary facies zone and considered that shale-fractured reservoir is easy to form in lime-shale development zone.According to the form of stress action,these stress fields have been divided into fault stress,structural stress and stratigraphic stress.The study considered that using maximum structural curvity and stratigraphic anomalous high pressure to predict shale-fractured development zone is effective method.The paper summarized seismic reflecting feature that shale-fractured reservoir corresponds to negative reflection coefficient on positive polarity section and low-velocity feature.The amplitude and frequency characters for shale-fracture in a different geologic condition also are summarized by using forward modeling technique in the paper.The paper proposed a reconstituting technique for geophysical feature of shale-fractured reservoir,reconstituted geophysical characteristic curve for shale-fractured reservoir by using low lateral resistivity and 2.5m resistivety log being representative of the region and achieved the desired and satisfied results in process of using real data.
With the development of E & D circumstances in Shengli oilfield,looking for oil has been transformed from formerly mainly looking purely for structural reservoir into mainly looking for more sophisticated subtle reservoir now.As a kind of special subtle reservoir type,shale-fractured reservoir is widely distributed over Zhanhua,Chezhen,Dongying source depression in Jiyang Depression,in which commercial oil with high production has been obtained in multiple well,and has a great prospecting potential.Through systematic study of shale-fractured reservoir in Sasan section (S3) of Luojia area of Shengli oilfield,the paper divided the area into favorable sedimentary facies zone and considered that shale-fractured reservoir is easy to form in lime-shale development zone.According to the form of stress action,these stress fields have been divided into fault stress,structural stress and stratigraphic stress.The study considered that using maximum structural curvity and stratigraphic anomalous high pressure to predict shale-fractured development zone is effective method.The paper summarized seismic reflecting feature that shale-fractured reservoir corresponds to negative reflection coefficient on positive polarity section and low-velocity feature.The amplitude and frequency characters for shale-fracture in a different geologic condition also are summarized by using forward modeling technique in the paper.The paper proposed a reconstituting technique for geophysical feature of shale-fractured reservoir,reconstituted geophysical characteristic curve for shale-fractured reservoir by using low lateral resistivity and 2.5m resistivety log being representative of the region and achieved the desired and satisfied results in process of using real data.
引文
1 石油勘探开发科学研究院地球物理研究所编.开发地震,1999
2 董冬等.济阳拗陷的泥质岩类油气藏.石油勘探与开发,1993,20(6):15～22
3 苏朝光等.罗西地区泥岩裂缝油气藏地震识别与描述.胜利物探新技术优秀论文集——隐蔽岩性油气藏地震解释技术专集,1999
2 董冬等.济阳拗陷的泥质岩类油气藏.石油勘探与开发,1993,20(6):15～22
3 苏朝光等.罗西地区泥岩裂缝油气藏地震识别与描述.胜利物探新技术优秀论文集——隐蔽岩性油气藏地震解释技术专集,1999
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