川西坳陷须家河组三段沉积特征及勘探潜力
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摘要
川西坳陷上三叠统须家河组三段的油气勘探一直未能取得突破,前人研究认为该层段主要为湖沼相沉积,缺乏良好的储集条件。为进一步搞清楚该层段的储层特征及勘探潜力,借助层序地层学分析方法,通过地震相和沉积相划分,将须三段分为上、下2个旋回,预测出其有利的沉积相带。从储层发育情况、油气运移通道以及油气藏保存条件等几个方面着手,对该层段的油气勘探潜力进行了综合分析。结论指出:须三段下部旋回在川西坳陷东部斜坡带具有较好的勘探潜力,而上部旋回在西部斜坡带也具有一定的勘探潜力。
No breakthrough has been made in the exploration of the third member of the Upper Triassic Xujiahe Formation in West Sichuan Depression.Previous studies believe that this interval is mainly of limnetic facies without good poroperm characteristics.In order to understand the features and exploration potentials of the reservoirs in this interval,sequence stratigraphic methods,in combination with the division of seismic facies and sedimentary facies,are used to divide this interval into two sedimentary cycles(an upper and a lower cycle)and to predict the favorable sedimentary facies belts.The exploration potential of this interval is comprehensively analyzed in respect of reservoir development,hydrocarbon migration pathways and hydrocarbon preservation.It is pointed out that the lower cycle has relatively high exploration potential in the eastern slope zone,while the upper cycle has some exploration potential in the western slope zone.
No breakthrough has been made in the exploration of the third member of the Upper Triassic Xujiahe Formation in West Sichuan Depression.Previous studies believe that this interval is mainly of limnetic facies without good poroperm characteristics.In order to understand the features and exploration potentials of the reservoirs in this interval,sequence stratigraphic methods,in combination with the division of seismic facies and sedimentary facies,are used to divide this interval into two sedimentary cycles(an upper and a lower cycle)and to predict the favorable sedimentary facies belts.The exploration potential of this interval is comprehensively analyzed in respect of reservoir development,hydrocarbon migration pathways and hydrocarbon preservation.It is pointed out that the lower cycle has relatively high exploration potential in the eastern slope zone,while the upper cycle has some exploration potential in the western slope zone.
引文
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[4]符晓.川西三套成藏系统及勘探研究[J].西南石油学院学报,2004,26(6):13-16.
[5]叶泰然,张虹,唐建明.深层裂缝性致密碎屑岩气藏高效储渗区识别——以川西新场气田上三叠统须家河组气藏为例[J].天然气工业,2009,29(11):22-26.
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[7]谢继容,李国辉,唐大海,等.四川盆地上三叠统须家河组沉积体系与沉积演化[J].天然气工业,2008,28(增刊1):1-4.
[8]曾华盛,郑冰.川西坳陷二叠系—上三叠统油气资源量计算[R].德阳:中国石化西南油气分公司,2008.
[9]谯述蓉,黄光祥,赵爽,等.四川省成都市大邑地区三维地震油气勘探成果报告[R].德阳:中国石化西南油气分公司,2008.
[10]王金琪.早聚晚藏——川西坳陷天然气基本特征[J].天然气工业,2001,21(1):1-8.
[11]林小兵,刘莉萍,魏力民.川西丰谷地区须四段钙屑砂岩含气储层预测[J].西南石油大学学报,2007,29(2):82-84.
[12]叶军.川西坳陷马鞍塘组须二段天然气成矿系统烃源岩评价[J].天然气工业,2003,23(1):21-25.
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