松辽盆地南部增盛断陷油气勘探前景分析
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摘要
针对增盛断陷研究程度低且未实现油气勘探突破的现状,开展了沉积特征及油气地质成藏条件系统剖析。研究结果表明:增盛断陷发育有以半深湖或浅湖为背景的扇三角洲-湖泊-湖底扇沉积体系,在沙河子组形成了一定规模的泥质中等气源岩和特低孔、低渗碎屑岩储集层,在营城组形成了特低孔、特低渗碎屑岩储集层,并构成了下生上储型、上生下储型和自生自储型三类生储盖组合,具有一定的油气勘探前景;重点勘探层位是沙河子组,兼探层位是营城组,有利勘探目标是斜坡带下端的砂体上倾尖灭带。
With very few studies undertaken so far and failure to achieve a breakthrough in oil and gas exploration,a systematic analysis of sedimentary characteristics and oil and gas accumulation conditions has been carried out in Zengsheng fault depression. The results show that the Zengsheng fault depression consists of a fan delta-lakesublacustrine fan sedimentary system developed in a semi-deep lacustrine or a shallow lacustrine background. Certain size of argillaceous medium quality source rock and clastic reservoir with ultra-low porosity and low permeability occurred in Shahezi Formation,and clastic reservoir of ultra-low porosity and permeability in Yingcheng Formation occurred. Three types of source-reservoir-cap assemblage are formed,i. e.,lower-generating and upper-storing type,upper-generating and lower-storing type,self-generating and self-storing type,with a certain prospects for oil and gas exploration. The key exploration horizon is Shahezi Formation,followed by Yingcheng Formation. The favorable exploration target is the updip pinch out of the sand body at the lower slope.
With very few studies undertaken so far and failure to achieve a breakthrough in oil and gas exploration,a systematic analysis of sedimentary characteristics and oil and gas accumulation conditions has been carried out in Zengsheng fault depression. The results show that the Zengsheng fault depression consists of a fan delta-lakesublacustrine fan sedimentary system developed in a semi-deep lacustrine or a shallow lacustrine background. Certain size of argillaceous medium quality source rock and clastic reservoir with ultra-low porosity and low permeability occurred in Shahezi Formation,and clastic reservoir of ultra-low porosity and permeability in Yingcheng Formation occurred. Three types of source-reservoir-cap assemblage are formed,i. e.,lower-generating and upper-storing type,upper-generating and lower-storing type,self-generating and self-storing type,with a certain prospects for oil and gas exploration. The key exploration horizon is Shahezi Formation,followed by Yingcheng Formation. The favorable exploration target is the updip pinch out of the sand body at the lower slope.
引文
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[11]赵乐强,贾凡建,曹剑,等.准噶尔盆地西北地区断层内流体活动过程及对断层启闭性的影响[J].石油实验地质,2017,39(4):461-466.ZHAO Le-qiang,JIA Fan-jian,CAO Jian,et al. Fluid activity in faults in Northwest Junggar Basin and its influence on fault opening and closing[J]. Petroleum Experimental Geology,2017,39(4):461-466.
[2]葛肖虹,刘俊来,任收麦,等.中国东部中-新生代大陆构造的形成与演化[J].中国地质,2014,41(1):19-38.GE Xiao-hong,LIU Jun-lai,REN Shou-mai,et al. Formation and evolution of the Mesozoic and Cenozoic continental structures in Eastern China[J]. Chinese Geology,2014,41(1):19-38.
[3]孙晓猛,朱德丰,郑常青,等.松辽盆地东缘中生代断裂构造特征、形成期次及其储层意义[J].吉林大学学报(地球科学版),2007,37(6):1055-1063.SUN Xiao-meng,ZHU De-feng,ZHENG Chang-qing,et al. Structural characteristics of Mesozoic faults in the eastern margin of Songliao Basin,their formation stages and reservoir significance[J]. Journal of Jilin Unviersity(Earth Science Edition),2007,37(6):1055-1063.
[4]张航,刘玉梅,宋立斌,等.吉林通化盆地三棵榆树断陷中新生代构造演化特征[J].世界地质,2017,36(4):1092-1099.ZHANG Hang,LIU Yu-mei,SONG Li-bin,et al. Mesozoic and Cenozoic tectonic evolution of the Sankeyushu fault depression in the Tonghua Basin, Jilin Province[J]. Global Geology,2017,36(4):1092-1099.
[5]孙连浦,刘招君,毛天基,等.伊通盆地莫里青断陷双阳组湖泊水下扇沉积特征[J].世界地质,2005,24(2):137-143.SUN Lian-pu,LIU Zhao-jun,MAO Tian-ji,et al. Sedimentary characteristics of lake subaqueous fan in Shuangyang Formation,Morri fault depression,Yitong Basin[J]. Global Geology,2005,24(2):137-143.
[6]王继远,董清水,林冬萍,等.松辽盆地南部双辽断陷生储盖特征与成藏主控因素分析[J].世界地质,2017,36(1):166-173.WANG Ji-yuan,DONG Qing-shui,LIN Dong-ping,et al. Characteristics of reservoir cap and main controlling factors of reservoir formation in Shuangliao fault depression in the south of Songliao Basin[J]. Global Geology,2017,36(1):166-173.
[7]董清水,史宝彦,苗洪波,等.地堑式断陷盆地油气成藏规律分析:以伊通地堑岔路河断陷南部为例[J].石油实验地质,2008,3(1):6-10.DONG Qing-shui,SHI Bao-yan,MIAO Hong-bo,et al.Analysis of hydrocarbon accumulation rule in graben style basin:a case from south Chaluhe fault depression of the Yitong Graben[J]. Petroleum Geology&Experiment,2008,3(1):6-10.
[8]任燕宁,崔桐,刘杨,等.松辽盆地东部榆树断陷下白垩统岩相展布特征及有利勘探区带预测[J].世界地质,2017,36(1):174-181.REN Yan-ning,CUI Tong,LIU Yang,et al. Lithofacies distribution characteristics of Lower Cretaceous and prediction of favorable exploration zones in Yushu fault depression,eastern Songliao Basin[J]. Global Geology,2017,36(1):174-181.
[9]董清水,赵占银,刘招君,等.半地堑式断陷盆地的油气成藏模式:以松辽盆地梨树断陷为例[J].吉林大学学报(地球科学版),2003,33(1):43-47.DONG Qing-shui,ZHAO Zhan-ying,LIU Zhao-jun,et al. The model for formation reservoir in half graben mode of fault-depression basin:taking the Lishu fault depression in Songliao basin as an example[J]. Journal of Jilin University(Earth Science Edition), 2003, 33(1):43-47.
[10]王玉学,张为民,丛玉梅,等.王府断陷断裂特征及其对深层火山岩气藏的控制作用研究[J].岩石学报,2018,34(7):2189-2199.WANG Yu-xue,ZHANG Wei-min,CONG Yu-mei,et al. Study on fault characteristics of Wangfu fault depression and its controlling effect on deep volcanic gas reservoir[J]. Journal of Petrology,2018,34(7):2189-2199.
[11]赵乐强,贾凡建,曹剑,等.准噶尔盆地西北地区断层内流体活动过程及对断层启闭性的影响[J].石油实验地质,2017,39(4):461-466.ZHAO Le-qiang,JIA Fan-jian,CAO Jian,et al. Fluid activity in faults in Northwest Junggar Basin and its influence on fault opening and closing[J]. Petroleum Experimental Geology,2017,39(4):461-466.