酒泉盆地油气勘探领域综合评价
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摘要
酒泉盆地南缘山前冲断带构造油气藏和富油凹陷内的构造—岩性油气藏为该盆地两个主要的勘探领域。山前冲断带勘探面临地质条件复杂,难以确定解释方案,速度建场难度大,难以准确落实构造圈闭形态等技术难点,文中提出采用构造建模与解释技术、变速成图技术等地震解释技术系列;构造—岩性油气藏勘探存在地震资料品质差,储层非均质性强,岩性(地层)圈闭识别难度大等困难,文中提出采用三维地震资料精细构造解释技术、断陷湖盆储层预测及岩性(地层)圈闭识别技术等针对性技术措施。通过对酒泉盆地油气勘探领域的综合评价,得出以下认识:①目前已发现的油田和探明储量主要位于山前冲断带,表明山前冲断带仍具有一定的勘探潜力,应继续加强山前带的地震采集—处理—解释一体化攻关;②酒泉盆地富油凹陷内的构造—岩性(地层)油气勘探领域具有较大的勘探潜力,但目前勘探、研究程度较低,应进一步加大该领域勘探、研究力度;③石大、花海凹陷和青西、营尔凹陷具有相似的结构和沉积特征,勘探已经证实具备一定的生油能力。应加强石大、花海凹陷构造、沉积特征研究,整体评价构造、岩性圈闭,寻找突破口。
The structural reservoir in piedmont thrust zone and structural-lithologic reservoir in oil-rich sag of southern margin of Jiuquan basin are two main exploration fields in the basin.The difficulties of exploration in piedmont thrust zone are complex geologic conditions,difficult to determine the interpretation plan and build up velocity field as well as difficult to accurately classify the feature of structural trap.The paper presented using seismic interpretation technical series of structural model buildup and interpretation technique,and variable velocity mapping technique;the difficulties in exploration of structural-lithologic reservoir are poorer quality of seismic data and strong non-homogeneity of reservoir as well as difficult to identify the traps,the paper presented the purposeful technical measures such as using 3-D seismic data fine structural interpretation technique,sag pond reservoir prediction and lithologic(stratigraphic) trap identified technique.It gained following knowledge by integrative evaluation of oil/gas exploration field in Jiuquan basin: ①the currently discovered oilfield and detected reserve lie mainly in piedmont thrust zone,showing that the piedmont thrust zone has still some exploration potential,and should continue to strengthen the tackling Key problems taking the seismic acquisition,processing and interpretation as an integral whole in piedmont thrust zone;②the structural-lithologic(stratigraphic) oil/gas exploration field in oil-rich sag of Jiuquan basin still has larger exploration potential,but the level of exploration and study is still low and it should further strengthen the efforts of exploration and study in the field;③Shida and Huahai sags have similar structural and sedimentary feature to Qingxi and Ying'er sags,the oil-generated capacity has been proved by exploration,and it should strengthen the study of structural and sedimentary feature for Shida and Huahai sags for purpose of integrative evaluating structural and lithologic traps and finding out breakthrough point.
The structural reservoir in piedmont thrust zone and structural-lithologic reservoir in oil-rich sag of southern margin of Jiuquan basin are two main exploration fields in the basin.The difficulties of exploration in piedmont thrust zone are complex geologic conditions,difficult to determine the interpretation plan and build up velocity field as well as difficult to accurately classify the feature of structural trap.The paper presented using seismic interpretation technical series of structural model buildup and interpretation technique,and variable velocity mapping technique;the difficulties in exploration of structural-lithologic reservoir are poorer quality of seismic data and strong non-homogeneity of reservoir as well as difficult to identify the traps,the paper presented the purposeful technical measures such as using 3-D seismic data fine structural interpretation technique,sag pond reservoir prediction and lithologic(stratigraphic) trap identified technique.It gained following knowledge by integrative evaluation of oil/gas exploration field in Jiuquan basin: ①the currently discovered oilfield and detected reserve lie mainly in piedmont thrust zone,showing that the piedmont thrust zone has still some exploration potential,and should continue to strengthen the tackling Key problems taking the seismic acquisition,processing and interpretation as an integral whole in piedmont thrust zone;②the structural-lithologic(stratigraphic) oil/gas exploration field in oil-rich sag of Jiuquan basin still has larger exploration potential,but the level of exploration and study is still low and it should further strengthen the efforts of exploration and study in the field;③Shida and Huahai sags have similar structural and sedimentary feature to Qingxi and Ying'er sags,the oil-generated capacity has been proved by exploration,and it should strengthen the study of structural and sedimentary feature for Shida and Huahai sags for purpose of integrative evaluating structural and lithologic traps and finding out breakthrough point.
引文
[1]贾承造等.前陆冲断带油气勘探.北京:石油工业出版社,2000
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