川东北元坝地区长兴组—飞仙关组台地边缘层序地层及其对储层的控制
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摘要
在野外露头、钻井岩心观察与测井、地震资料解释的基础上,开展了四川盆地东北部元坝地区长兴组—飞仙关组层序地层研究,将长兴组—飞仙关组划分为4个Ⅲ级层序,分别为SQ1、SQ2、SQ3及SQ4。对层序与储层的综合研究表明:储层分布明显受Ⅲ级层序体系域及沉积相控制,储层主要分布于SQ1、SQ2及SQ3的高位体系域中,为台地边缘浅滩相及台地边缘礁滩相沉积;长兴组储层岩性以生屑白云岩及生屑灰岩为主,储层物性好;飞仙关组储层岩性以亮晶鲕粒灰岩为主,储层物性一般。
Based on the observation of outcrops and cores as well as on the interpretation of well-log and seismic data,the present paper studied sequence strata of the Changxing and Feixianguan formations in the Yuanba area,and recognized sequence boundaries and system tract boundaries.The Changxing and Feixianguan formations could be divided into four third-order sequences,namely SQ1,SQ2,SQ3 and SQ4.The comprehensive study on the reservoirs and sequences indicated that ① the distribution of reservoirs was clearly controlled by the system tract of the third-order sequence and sedimentary facies;② reservoirs were mainly distributed in high stand system tracts of the SQ1,SQ2 and SQ3 sequences,which were composed of shallow-shoal facies and reef-shoal facies of the platform edge;③ reservoirs in the Changxing Formation were lithologically dominated by bioclastic dolomites and bioclastic limestones with good physical property,while reservoirs in the Feixianguan Formation were mainly composed of oosparites with medium physical property.
Based on the observation of outcrops and cores as well as on the interpretation of well-log and seismic data,the present paper studied sequence strata of the Changxing and Feixianguan formations in the Yuanba area,and recognized sequence boundaries and system tract boundaries.The Changxing and Feixianguan formations could be divided into four third-order sequences,namely SQ1,SQ2,SQ3 and SQ4.The comprehensive study on the reservoirs and sequences indicated that ① the distribution of reservoirs was clearly controlled by the system tract of the third-order sequence and sedimentary facies;② reservoirs were mainly distributed in high stand system tracts of the SQ1,SQ2 and SQ3 sequences,which were composed of shallow-shoal facies and reef-shoal facies of the platform edge;③ reservoirs in the Changxing Formation were lithologically dominated by bioclastic dolomites and bioclastic limestones with good physical property,while reservoirs in the Feixianguan Formation were mainly composed of oosparites with medium physical property.
引文
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[12]戴荔果,郑荣才,李爽,等.川东—渝北地区飞仙关组层序-岩相古地理特征[J].中国地质,2009,36(1):110-119.Dai Liguo,Zheng Rongcai,Li Shuang,et al.Sequence-based litho-facies and paleogeography of Lower Triassic Feixianguan Forma-tion in eastern Sichuan and northern Chongqing area[J].Geologyin China,2009,36(1):110-119.
[2]马永生.四川盆地普光超大型气田的形成机制[J].石油学报,2007,28(2):9-14.Ma Yongsheng.Generation mechanism of Puguang Gas Field inSichuan Basin[J].Acta Petrolei Sinica,2007,28(2):9-14.
[3]徐强,刘宝?,何汉漪,等.四川晚二叠世生物礁层序地层岩相古地理编图[J].石油学报,2004,25(2):47-50.Xu Qiang,Liu Baojun,He Hanyi,et al.Sequence stratigraphylithofacies and paleogeography mapping for the Late Permian reefin Sichuan Basin[J].Acta Petrolei Sinica,2004,25(2):47-50.
[4]牟传龙,谭钦银,余谦,等.川东北地区上二叠统长兴组生物礁组成及成礁模式[J].沉积与特提斯地质,2004,24(3):65-71.Mou Chuanlong,Tan Qinyin,Yu Qian,et al.The organic reefsand their reef-forming model for the Upper Permian ChangxingFormation in northeastern Sichuan[J].Sedimentary Geology andTethyan Geology,2004,24(3):65-71.
[5]马永生,郭旭升,凡睿.川东北普光气田飞仙关组鲕滩储集层预测[J].石油勘探与开发,2005,32(4):60-64.Ma Yongsheng,Guo Xusheng,Fan Rui.Reservoir prediction ofFeixianguan Formation in Puguang Gas Field,Northeast SichuanProvince[J].Petroleum Exploration and Development,2005,32(4):60-64.
[6]马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185.Ma Yongsheng,Mou Chuanlong,Guo Tonglou,et al.Sequencestratigraphy and reservoir distribution of the Changxing Forma-tion in northeastern Sichuan Basin[J].Earth Science Frontiers,2005,12(3):179-185.
[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,2005,25(4):73-79.Ma Yongsheng,Mou Chuanlong,Guo Tonglou,et al.Sequencestratigraphy and reservoir distribution of Feixianguan Formationin northeastern Sichuan[J].Journal of Mineralogy and Petrolo-gy,2005,25(4):73-79.
[8]周琦,卓胜广,魏国齐,等.四川盆地北部下三叠统飞仙关组层序地层分析[J].地层学杂志,2008,32(4):406-410.Zhou Qi,Zhuo Shengguang,Wei Guoqi,et al.Sequence stratigraphicanalysis of the Lower Triassic Feixianguan Formation in northern Si-chuan Basin[J].Journal of Stratigraphy,2008,32(4):406-410.
[9]朱永进,刘玲利,赵睿,等.普光气田飞仙关组层序地层划分[J].断块油气田,2009,16(2):1-4.Zhu Yongjin,Liu Lingli,Zhao Rui,et al.Sequence stratigraphicclassification of Feixianguan Formation in Puguang Gas Field[J].Fault-Block Oil&Gas Field,2009,16(2):1-4.
[10]李国军,郑荣才,唐玉林,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.Li Guojun,Zheng Rongcai,Tang Yulin,et al.Sequence-basedlithofacies and palaeogeography of Lower Triassic FeixianguanFormation in northeastern Sichuan Basin[J].Lithologic Reser-voirs,2007,19(4):64-70.
[11]郑荣才,罗平,文其兵,等.川东北地区飞仙关组层序-岩相古地理特征和鲕滩预测[J].沉积学报,2009,27(1):1-8.Zheng Rongcai,Luo Ping,Wen Qibing,et al.Characteristics ofsequence-based lithofacies and paleogeography,and prediction ofoolitic shoal of the Feixianguan Formation in the northeastern Si-chuan[J].Acta Sedimentologica Sinica,2009,27(1):1-8.
[12]戴荔果,郑荣才,李爽,等.川东—渝北地区飞仙关组层序-岩相古地理特征[J].中国地质,2009,36(1):110-119.Dai Liguo,Zheng Rongcai,Li Shuang,et al.Sequence-based litho-facies and paleogeography of Lower Triassic Feixianguan Forma-tion in eastern Sichuan and northern Chongqing area[J].Geologyin China,2009,36(1):110-119.
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