陆西凹陷九佛堂组砂体成因类型及储集性能
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摘要
利用岩心观察、薄片鉴定、粒度分析及地震和测井解释等分析方法,对开鲁盆地陆家堡坳陷陆西凹陷九佛堂组砂体成因类型及储集性能进行研究。结果表明,储集砂体主要为曲流河三角洲前缘水下分流河道砂体、辫状河三角洲前缘水下分流河道砂体、扇三角洲前缘水下分流河道砂体和滑塌浊积扇砂体4种类型,其储集性能主要表现为高—中孔、低—特低渗。3类水下分流河道砂体自凹陷南西、南东、北东和北西向五十家子庙洼陷呈收敛状分布,浊积扇砂体则发育在以上3类砂体的前端,呈星点状散布于五十家子庙洼陷的深湖—半深湖相沉积中。3类水下分流河道砂体主要为分布在凹陷主干断裂附近的构造油气藏的储集层,五十家子庙洼陷中九佛堂组上段的滑塌浊积扇砂体可形成砂岩透镜体型岩性油气藏,是今后勘探的有利目标。图10表1参13
Comprehensive analysis of seismic,log,core and granularity data shows that there are four genetic types of sand bodies in Cretaceous Jiufotang Formation in Luxi Sag,including sand bodies of subaqueous distributary channels in the front of meandering river delta,braided river delta and fan-delta,and sand body of fluxoturbidite fan.They have middle to high porosity and low to very low permeability.The sand bodies of subaqueous distributary channels converge towards the Wushijiazimiao subsag from the southwest,southeast,northeast and northwest of the Luxi Sag.The fluxoturbidite fans are developed in front of those sand bodies and scattered in half-deep to deep lake facies of the Wushijiazimiao subsag.The subaqueous distritutary channels sand bodies are reservoirs of the structural petroleum pools near the main fault in Luxi Sag,and the fluxoturbidite fans of the upper segment of Jiufotang Formation developed in Wushijiazimiao subsag may form lenticular sand lithological pools and are the preferred exploration targets in the future.
Comprehensive analysis of seismic,log,core and granularity data shows that there are four genetic types of sand bodies in Cretaceous Jiufotang Formation in Luxi Sag,including sand bodies of subaqueous distributary channels in the front of meandering river delta,braided river delta and fan-delta,and sand body of fluxoturbidite fan.They have middle to high porosity and low to very low permeability.The sand bodies of subaqueous distributary channels converge towards the Wushijiazimiao subsag from the southwest,southeast,northeast and northwest of the Luxi Sag.The fluxoturbidite fans are developed in front of those sand bodies and scattered in half-deep to deep lake facies of the Wushijiazimiao subsag.The subaqueous distritutary channels sand bodies are reservoirs of the structural petroleum pools near the main fault in Luxi Sag,and the fluxoturbidite fans of the upper segment of Jiufotang Formation developed in Wushijiazimiao subsag may form lenticular sand lithological pools and are the preferred exploration targets in the future.
引文
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[4]张辉.内蒙古东部陆西凹陷油气成藏条件与分布规律[J].大庆石油学院学报,2006,30(2):1-4.
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[7]王西文,刘全新,吕焕通,等.储集层预测技术在岩性油气藏勘探开发中的应用[J].石油勘探与开发,2006,33(2):189-193.
[8]朱如凯,郭宏莉,何东博,等.塔中地区志留系柯坪塔格组砂体类型及储集性[J].石油勘探与开发,2005,32(5):16-19,24.
[9]李春华,祝传林,王风华.东营凹陷胜坨地区沙三沙四段扇体特征与岩性类油气藏[J].石油大学学报(自然科学版),2003,27(3):14-16,21.
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[13]周灿灿,王拥军,周凤鸣.近源砂岩原生孔隙储集层岩石相控建模及其应用[J].石油勘探与开发,2006,33(5):553-557.
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