柴西南区石油地质特征及再勘探再研究的建议
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摘要
在分析柴西南地区石油特征的基础上,针对当前勘探工作中存在的问题,提出了进一步开展勘探与研究的建议:①对柴西南区昆仑山前逆掩推覆体开展地震勘探,查明原盆边界,搞清逆掩复杂构造带下盘沉积岩分布范围、构造形态、高点位置,寻找新的勘探领域。②对七个泉—东柴山油气富集带已发现的老油田和含油气构造,充分利用三维大连片地震资料开展变速成图,落实构造形态及储层横向预测,研究深浅层可能存在的新的含油层系,不断提高油田采收率,确保老油田稳产高产;大力开展层序地层学研究,查明烃源岩分布范围、生烃中心与储层有利相带的叠置关系,搞清地层尖灭带、岩性变化带,落实岩性地层圈闭,寻找新的含油层系及含油气领域。③开展构造精细解释:一是研究柴西南区几条大型逆断层下盘生油潜力及其伴生构造对油气聚集的作用;二要研究七个泉—东柴山油气富集带在老油田周边可能存在小断块、小幅度构造;三是落实昆北大断层上盘已发现的局部构造及岩性、地层、古潜山圈闭。
Based on analyzing the petroleum characteristics of Southwestern Qaidam Basin,in view of the existing problems in current exploration,suggestions are proposed for further exploration and study.First,seismic exploration should be launched on the piedmont overthrust nappe in the Kunlun Mountains located in Southwestern Qaidam Basin,learning the original basin boundary,finding out the distribution range,structural attitude,high focus location of downdip sedimentary rock of complex overthrust belt,and finding new exploration domains.Second,with regard to the old oilfields and oil and gas structures that have been discovered in Qigequan-Dongchaishan oil and gas accumulation zone,3D seismic data should be fully used for variable velocity mapping,ascertaining structural attitude and lateral reservoir prediction,studying new hydrocarbon reservoir assemblages probably exist in deep and shallow layers,enhancing oil recovery increasingly,ensuring high and stable yields of old oilfields,launching sequence stratigraphy study with great efforts,identifying the superimposed relation between hydrocarbon center and favorable reservoir facies and the distribution of hydrocarbon source rock,finding out the stratigraphic pinch-out zone and lithologically changing zone,ascertaining lithostratigrapic traps,and finding new hydrocarbon strata and area.Third,fine structural interpretation should be carried out:studying the effect of genetic potential of downdip of several large overthrust belts and its associated structure on oil and gas accumulation;studying the probable existence of small fault blocks and low-amplitude structure in the periphery of old oilfields,ascertaining the local strucure,lithologic traps,stratigraphic traps,and buried-hill traps that have been discovered in the great Kunbei fault.
Based on analyzing the petroleum characteristics of Southwestern Qaidam Basin,in view of the existing problems in current exploration,suggestions are proposed for further exploration and study.First,seismic exploration should be launched on the piedmont overthrust nappe in the Kunlun Mountains located in Southwestern Qaidam Basin,learning the original basin boundary,finding out the distribution range,structural attitude,high focus location of downdip sedimentary rock of complex overthrust belt,and finding new exploration domains.Second,with regard to the old oilfields and oil and gas structures that have been discovered in Qigequan-Dongchaishan oil and gas accumulation zone,3D seismic data should be fully used for variable velocity mapping,ascertaining structural attitude and lateral reservoir prediction,studying new hydrocarbon reservoir assemblages probably exist in deep and shallow layers,enhancing oil recovery increasingly,ensuring high and stable yields of old oilfields,launching sequence stratigraphy study with great efforts,identifying the superimposed relation between hydrocarbon center and favorable reservoir facies and the distribution of hydrocarbon source rock,finding out the stratigraphic pinch-out zone and lithologically changing zone,ascertaining lithostratigrapic traps,and finding new hydrocarbon strata and area.Third,fine structural interpretation should be carried out:studying the effect of genetic potential of downdip of several large overthrust belts and its associated structure on oil and gas accumulation;studying the probable existence of small fault blocks and low-amplitude structure in the periphery of old oilfields,ascertaining the local strucure,lithologic traps,stratigraphic traps,and buried-hill traps that have been discovered in the great Kunbei fault.
引文
高洁等,柴达木盆地西部南区三维连片叠前时间偏移处理解释项目技术设计,2007。
党玉琪等,柴达木盆地油气富集规律、目标综合评价及勘探实践,2004。
青海油田分公司,柴达木盆地石油地质研究新进展,2002。
靳久强等,柴达木盆地石油地质认识与勘探建议,2002。
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[7]王燮培.石油勘探构造分析[M].武汉:中国地质大学出版社,1992:184～228.
党玉琪等,柴达木盆地油气富集规律、目标综合评价及勘探实践,2004。
青海油田分公司,柴达木盆地石油地质研究新进展,2002。
靳久强等,柴达木盆地石油地质认识与勘探建议,2002。
[1]吴崇筠,等.中国含油气盆地沉积学[M].北京:石油工业出版社,1993:361～364.
[2]陈志勇,张道伟,赵东升.柴达木盆地西部南区第三系岩性油藏勘探与实践[J].中国石油勘探,2006,11(6):17～21.
[3]尹成明,江波,韩秦鹏,等.柴达木盆地石油勘探潜力及勘探方向[J].中国石油勘探,2006,11(6):38～41.
[4]甘贵元,雷振锋,赵东升,等.柴达木盆地西部南区沸石分布特征及成因[J].中国石油勘探,2009,14(2):46～49.
[5]池英柳.岩性地层油气藏勘探理论与实践[M].北京:石油工业出版社,2005:147～152.
[6]姜在兴.沉积学[M].北京:石油工业出版社,2003:504～507.
[7]王燮培.石油勘探构造分析[M].武汉:中国地质大学出版社,1992:184～228.
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