元坝地区长兴组典型沉积相及各相带物性特征
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摘要
元坝气田是四川盆地继普光气田之后所发现的又一大型海相气田,其中,晚二叠世长兴组是元坝气田的主力产层。研究以不同相带钻井为代表,经过岩芯观察、地震资料、测井解释及样品的孔渗数据分析,对元坝地区长兴组所发育的各种沉积相带特征及各沉积相带的物性特征进行对比研究,结果表明:(1)开阔台地、台地边缘浅滩、台地边缘生物礁、台地边缘斜坡及陆棚相在元坝地区长兴期均有发育;(2)在元坝西北部,越靠近台地边缘,其生物礁建隆越明显;(3)长兴组主要可划分出两期成礁旋回,则均发育于长二段;(4)东南部台地边缘斜坡相带窄,坡度陡,西北部则相反;(5)台地边缘暴露浅滩相物性最好,通常形成良好的孔隙型储层;台地边缘生物礁相、台地边缘浅滩相及开阔台地相物性次之,通常形成孔隙-裂缝复合型储层;而斜坡-陆棚相只形成裂缝型储层。
Beside Puguang gas field,Yuanba gas field is another new large marine gas field discovered by Sinopic in Sichuan basin.In Yuanba gas field,Changxing Formation of Late Permian is the main production layer.Based on the representative drilling wells located in different kind of sedimentary facies,the core observation,datum of well interpretation and testing data of sample,the characteristics of each sedimentary facies and their reservoir petro-physics are researched and summarized.The result shows that:(1) in Yuanba district,open platform facies,platform edge shallow facies,platform edge reef facies,platform edge slope facies and shelf facies have all developed in Changhsingian;(2) in the northwest of Yuanba district,the closer to platform margin,the more obvious of reef buildups;(3) Changxing Formation can be divided into two reef cycles,and both of them developed in the second Member;(4) in southeast of Yuanba district,the platform edge slope facies is narrow and steep,but it is on the contrary in northwest of this district;(5) the petro-physics of the platform edge exposed shallow facies is the best,and it usually formed a good porous reservoirs,and followed by the petro-physics of platform edge reef facies,platform edge shallow facies and open platform facies.They usually formed porous and fractured composite reservoirs,and slope and shelf only formed fractured reservoirs.
Beside Puguang gas field,Yuanba gas field is another new large marine gas field discovered by Sinopic in Sichuan basin.In Yuanba gas field,Changxing Formation of Late Permian is the main production layer.Based on the representative drilling wells located in different kind of sedimentary facies,the core observation,datum of well interpretation and testing data of sample,the characteristics of each sedimentary facies and their reservoir petro-physics are researched and summarized.The result shows that:(1) in Yuanba district,open platform facies,platform edge shallow facies,platform edge reef facies,platform edge slope facies and shelf facies have all developed in Changhsingian;(2) in the northwest of Yuanba district,the closer to platform margin,the more obvious of reef buildups;(3) Changxing Formation can be divided into two reef cycles,and both of them developed in the second Member;(4) in southeast of Yuanba district,the platform edge slope facies is narrow and steep,but it is on the contrary in northwest of this district;(5) the petro-physics of the platform edge exposed shallow facies is the best,and it usually formed a good porous reservoirs,and followed by the petro-physics of platform edge reef facies,platform edge shallow facies and open platform facies.They usually formed porous and fractured composite reservoirs,and slope and shelf only formed fractured reservoirs.
引文
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[12]郭彤楼.元坝气田长兴组储层特征与形成主控因素研究[J].岩石学报,2011,27(8):2381-2391.
[13]张元春,邹华耀,李平平,等.川东北元坝地区长兴组流体包裹体特征及油气充注史[J].新疆石油地质,2010,31(3):250-251.
[14]郭彤楼.元坝深层礁滩气田基本特征与成藏主控因素[J].天然气工业,2011,31(10):12-16.
[15]胡东风.川东北元坝地区隐蔽气藏的勘探突破及其意义[J].天然气工业,2010,30(8):9-12.
[16]刘划一,张静,洪海涛.四川盆地东北部长兴组飞仙关组气藏形成条件研究[J].天然气勘探与开发,2001,24(2):30-38.
[17]戴建全.川东北元坝地区长兴组-飞仙关组气藏勘探潜力评价[J].成都理工大学学报:自然科学版,2010,37(4):419-424.
[18]马永生,蔡勋育.四川盆地川东北区二叠系—三叠系天然气勘探成果与前景展望[J].石油与天然气地质,2006,27(6):741-750.
[19]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.
[20]张建勇,周进高,郝毅,等.四川盆地环开江—梁平海槽长兴组—飞仙关组沉积模式[J].海相油气地质,2011,16(3):45-54.
[21]马永生,储昭宏.普光气田台地建造过程及其礁滩储层高精度层序地层学研究[J].石油与天然气地质,2008,29(5):548-557.
[22]倪新锋,陈洪德,田景春,等.川东北地区长兴组—飞仙关组沉积格局及成藏控制意义[J].石油与天然气地质,2007,28(4):458-465.
①谭钦银,等.《西渝东地区长兴飞仙关组沉积与层序地层研究》,股份有限公司江汉油田分公司,成都理工大学,2010年.
[2]徐强,刘宝珺,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.
[3]马永生,牟传龙,郭旭升,等.四川盆地东北部长兴期沉积特征与沉积格局[J].地质论评,2006,52(1):25-29.
[4]郭彤楼.川东北地区台地边缘礁、滩气藏沉积与储层特征[J].地学前缘,2011,18(4):201-211.
[5]段金宝,黄仁春,程胜辉,等.川东北元坝地区长兴期-飞仙关期碳酸盐岩台地沉积体系及演化[J].成都理工大学学报:自然科学版,2008,35(6):663-668.
[6]程锦翔,谭钦银,郭彤楼,等.川东北元坝地区长兴组-飞仙关组碳酸盐台地边缘沉积特征及演化[J].沉积与特提斯地质,2010,30(4):29-38.
[7]王鸿祯,史晓颖,王训练,等.中国层序地层研究[M].广州:广东科技出版社,2000,1-30.
[8]李凤杰,刘殿鹤,郑荣才,等.四川盆地东北地区上二叠统层序地层特征研究[J].沉积学报,2009,27(6):1116-1124.
[9]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,2005,25(4):73-79.
[10]吴熙纯,刘效曾,杨仲伦,等.川东上二叠统长兴组生物礁控储层的形成[J].石油与天然气地质,1990,11(3):283-297.
[11]刘殊,唐建明,马永生,等.川东北地区长兴组-飞仙关组礁滩相储层预测[J].石油与天然气地质,2006,27(3):332-338.
[12]郭彤楼.元坝气田长兴组储层特征与形成主控因素研究[J].岩石学报,2011,27(8):2381-2391.
[13]张元春,邹华耀,李平平,等.川东北元坝地区长兴组流体包裹体特征及油气充注史[J].新疆石油地质,2010,31(3):250-251.
[14]郭彤楼.元坝深层礁滩气田基本特征与成藏主控因素[J].天然气工业,2011,31(10):12-16.
[15]胡东风.川东北元坝地区隐蔽气藏的勘探突破及其意义[J].天然气工业,2010,30(8):9-12.
[16]刘划一,张静,洪海涛.四川盆地东北部长兴组飞仙关组气藏形成条件研究[J].天然气勘探与开发,2001,24(2):30-38.
[17]戴建全.川东北元坝地区长兴组-飞仙关组气藏勘探潜力评价[J].成都理工大学学报:自然科学版,2010,37(4):419-424.
[18]马永生,蔡勋育.四川盆地川东北区二叠系—三叠系天然气勘探成果与前景展望[J].石油与天然气地质,2006,27(6):741-750.
[19]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.
[20]张建勇,周进高,郝毅,等.四川盆地环开江—梁平海槽长兴组—飞仙关组沉积模式[J].海相油气地质,2011,16(3):45-54.
[21]马永生,储昭宏.普光气田台地建造过程及其礁滩储层高精度层序地层学研究[J].石油与天然气地质,2008,29(5):548-557.
[22]倪新锋,陈洪德,田景春,等.川东北地区长兴组—飞仙关组沉积格局及成藏控制意义[J].石油与天然气地质,2007,28(4):458-465.
①谭钦银,等.《西渝东地区长兴飞仙关组沉积与层序地层研究》,股份有限公司江汉油田分公司,成都理工大学,2010年.
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