元坝气田下三叠统飞仙关组层序地层研究
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摘要
本文根据岩芯、岩石薄片、钻井和地震等资料的研究成果,将川东北元坝地区飞仙关组划分为两个三级层序:SQ1相当于飞仙关组一段、二段,SQ2相当于飞仙关组三段、四段。SQ1、SQ2由海侵体系域和高位体系域构成,缺少低位体系域。SQ1—TST期,元坝地区主要位于浅水碳酸盐台地上,为开阔台地相沉积,靠近东部为陆棚斜坡相沉积,从西到东依次发育开阔台地-台地边缘-斜坡相沉积。SQ1层序沉积时期,全区呈现西薄东厚的楔形几何形体。SQ2层序沉积时期,由于SQ1期的填平补齐作用,致使研究区整体演变为浅水碳酸盐台地沉积,沉积格局差异不大,以海侵和高位体系域为特征,对应海侵期的开阔台地和高位期的蒸发台地沉积。
The Feixianguan Formation in the Yuanba gas field,northeastern Sichuan may be divided,on the basis of cores,thin sections,well logs and seismic data,into two third-order sequences: SQ1 representing the 1st and 2nd members,and SQ2 representing the 3rd and 4th members of the Feixianguan Formation.Grounded upon the carbonate platform,both SQ1 and SQ2 are made up of the transgressive and highstand systems tracts and lack of the lowstand systems tract.During the deposition of the transgressive systems tract of SQ1,the bulk of the Yuanba area is built up of the open platform deposits on the shallow-water carbonate platform,and continental shelf deposits near the east.During the deposition of the highstand systems tract of SQ2,there are gradations of the open platform-platform margin-slope deposits from west to east.Till the deposition of SQ2,the whole area graded into the shallow-water carbonate platform dominated by the transgressive and highstand systems tracts representing the open platform deposits in the transgressive phase and evaporate platform deposits in the highstand phase.
The Feixianguan Formation in the Yuanba gas field,northeastern Sichuan may be divided,on the basis of cores,thin sections,well logs and seismic data,into two third-order sequences: SQ1 representing the 1st and 2nd members,and SQ2 representing the 3rd and 4th members of the Feixianguan Formation.Grounded upon the carbonate platform,both SQ1 and SQ2 are made up of the transgressive and highstand systems tracts and lack of the lowstand systems tract.During the deposition of the transgressive systems tract of SQ1,the bulk of the Yuanba area is built up of the open platform deposits on the shallow-water carbonate platform,and continental shelf deposits near the east.During the deposition of the highstand systems tract of SQ2,there are gradations of the open platform-platform margin-slope deposits from west to east.Till the deposition of SQ2,the whole area graded into the shallow-water carbonate platform dominated by the transgressive and highstand systems tracts representing the open platform deposits in the transgressive phase and evaporate platform deposits in the highstand phase.
引文
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[9]王银.川东北元坝地区生物礁的识别与追踪[J].天然气技术,2009,3(4):25-30.
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[11]苗顺德,李秋芬,欧阳诚.黄骅坳陷古近系层序地层格架特征及模式研究[J].中国地质,2008,35(2):256-263.
[12]李德江,朱筱敏,董艳蕾,等.辽东湾坳陷古近系沙河街组层序地层分析[J].石油勘探与开发,2007,34(6):669-676.
[13]李军辉,卢双舫,柳成志,等.贝尔凹陷西斜坡南屯组层序特征及其油气成藏模式研究[J].沉积学报,2009,27(2):306-311.
[2]冉隆辉,陈更生,张健,等.四川盆地东北部飞仙关鲕滩储层分布研究与勘探潜力分析[J].中国石油勘探,2002,7(1):46-55.
[3]王一刚,刘划一,文应初,等.川东北飞仙关组鲕滩储层分布规律勘探方法与远景预测[J].天然气工业,2002,22(增刊):14-19.
[4]杨雨,张静,张光荣.川东下三叠统飞仙关组鲕滩分布及其天然气勘探前景[J].成都理工学院学报,2000,27(增刊):147-149.
[5]穆曙光,周茂,华永川.川东北地区下三叠统飞仙关组白云岩成因[J].天然气工业,1994,14(3):23-30.
[6]王罗兴,谢芳,李油.川东北飞仙关组鲕滩气藏地震响应特征及勘探展望[J].天然气工业,2000,20(5):26-30.
[7]马永生,牟传龙,郭彤楼,等,四川盆地东北部飞仙关组层序地层与储层分布[J].矿物岩石,2005,20(4):73-79.
[8]李国军,郑荣才,唐雨林,等.川东北地区飞仙关组层序—岩相古地理特征[J].岩性油气藏,2007,19(4):64-70.
[9]王银.川东北元坝地区生物礁的识别与追踪[J].天然气技术,2009,3(4):25-30.
[10]高长林,刘光祥,张玉箴,等.东秦岭-大巴山逆冲推覆构造与油气远景[J].石油实验地质,2003,25(增刊):523-531.
[11]苗顺德,李秋芬,欧阳诚.黄骅坳陷古近系层序地层格架特征及模式研究[J].中国地质,2008,35(2):256-263.
[12]李德江,朱筱敏,董艳蕾,等.辽东湾坳陷古近系沙河街组层序地层分析[J].石油勘探与开发,2007,34(6):669-676.
[13]李军辉,卢双舫,柳成志,等.贝尔凹陷西斜坡南屯组层序特征及其油气成藏模式研究[J].沉积学报,2009,27(2):306-311.
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