天环坳陷西南部延长组长6_3段气藏分析
|
摘要
鄂尔多斯盆地天环向斜南段西翼彭阳地区延长组首次钻出了高产气井,综合测井、地震以及油气地化资料,借助衰减含气检测技术,分析研究储层沉积相、构造特征、气源和气藏类型,以查明气藏成藏规律和有利区分布。研究结果表明,长6_3属三角洲平原—三角洲前缘亚相,微相包括呈北东向展布的分流河道、河口坝等,单层厚度为5～11m,平面上呈透镜状。储层平均孔隙度为18.64%,平均渗透率为4.00mD。长6_3顶面属于北东和北东东向两组断裂切割的复杂断背斜构造。地化资料显示天然气源于张家滩页岩的原油伴生气。分频结果表明,在4条二维地震剖面上的产气井附近,长63反射出现了能量衰减及主频降低现象。综合分析认为,气藏呈3个北东向条带展布,最大气层厚度为15m,气藏边界受断裂和砂体透镜体边界复合控制。以上成果认识,对该区有利区带优选具有一定的指导价值。
Pengyang area is located in the southwestern part of Tianhuan depression of Ordos basin.High productivity gas wells were firstly discovered in Upper Triassic Yanchang formation in Pengyang area.In this paper,reservoir sedimentary facies,tectonic characteristics,gas source and gas reservoir types were analyzed by logging,2D seismic and hydrocarbon geochemical data to provide a new understanding of Yanchang formation gas reservoirs in the study area.The target layer belongs to the delta front-delta front subfacies,and the microfacies include the NNE distributary channel and estuary dam.The average porosity of the reservoir is 18.64%,permeability is 4.00 mD.The top of Chang-6_3 belongs to the complex faulted anticline structure that is cut the north-east and northeast-east faults.Geochemical data showed that natural gas is associated with crude oil derived Zhangjiajie shale.The spectral decomposition results showed that the main frequency of the target layer is reduced at the four seismic sections near the gas well.The analysis showed that the gas reservoirs in the study area are distributed in three northeast bands with the maximum gas layer thickness of 15 m.The boundaries of the gas reservoirs are controlled by the faults and the boundaries of the sand bodies.The above understanding is of guiding value for the optimization of the favorable area in this area.
Pengyang area is located in the southwestern part of Tianhuan depression of Ordos basin.High productivity gas wells were firstly discovered in Upper Triassic Yanchang formation in Pengyang area.In this paper,reservoir sedimentary facies,tectonic characteristics,gas source and gas reservoir types were analyzed by logging,2D seismic and hydrocarbon geochemical data to provide a new understanding of Yanchang formation gas reservoirs in the study area.The target layer belongs to the delta front-delta front subfacies,and the microfacies include the NNE distributary channel and estuary dam.The average porosity of the reservoir is 18.64%,permeability is 4.00 mD.The top of Chang-6_3 belongs to the complex faulted anticline structure that is cut the north-east and northeast-east faults.Geochemical data showed that natural gas is associated with crude oil derived Zhangjiajie shale.The spectral decomposition results showed that the main frequency of the target layer is reduced at the four seismic sections near the gas well.The analysis showed that the gas reservoirs in the study area are distributed in three northeast bands with the maximum gas layer thickness of 15 m.The boundaries of the gas reservoirs are controlled by the faults and the boundaries of the sand bodies.The above understanding is of guiding value for the optimization of the favorable area in this area.
引文
[1]赵俊兴,陈洪德,时志强.古地貌恢复技术方法及其研究意义:以鄂尔多斯盆地侏罗纪沉积前古地貌研究为例[J].成都理工学院学报,2001(3):260-266.
[2]杨华,陶家庆,欧阳征健,等.鄂尔多斯盆地西缘构造特征及其成因机制[J].西北大学学报(自然科学版),2011,41(5):863-868.
[3]兰朝利,王建国,周晓峰,等.鄂尔多斯盆地彭阳油田侏罗系延安组油藏成藏规律[J].油气地质与采收率,2014,21(5):45-48.
[4]刘联群,刘建平,李勇,等.鄂尔多斯盆地彭阳地区侏罗系延安组油气成藏主控因素分析[J].地球科学与环境学报,2010,32(3):263-267.
[5]兰朝利,王奇,张欣.彭阳油田长3段成藏条件与成藏规律[J].西安石油大学学报(自然科学版),2016,31(2):1-10.
[6]付金华,郭正权,邓秀芹.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J].古地理学报,2005,7(1):34-44.
[7]杨华,刘自亮,朱筱敏,等.鄂尔多斯盆地西南缘上三叠统延长组物源与沉积体系特征[J].地学前缘,2013,20(2):10-18.
[8]杨华,窦伟坦,刘显阳,等.鄂尔多斯盆地三叠系延长组长7沉积相分析[J].沉积学报,2010,28(2):254-263.
[9]梁晓伟,王海红,牛小兵,等.鄂尔多斯盆地中西部延长组烃源岩评价及油-源对比[J].成都理工大学学报(自然科学版),2011,38(4):402-407.
[10]胡维强,赵靖舟,李军,等.鄂尔多斯盆地西南部上古生界烃源岩特征及其对天然气藏形成与分布的控制作用[J].天然气地球科学,2015,26(6):1068-1075.
[11]董丽红,安思谨,王变阳.鄂尔多斯盆地三叠系延长组长7、长9油页岩分布特征与油气富集关系[J].非常规油气,2014,1(1):17-21.
[12]苗建宇,赵建设,李文厚,等.鄂尔多斯盆地南部烃源岩沉积环境研究[J].西北大学学报(自然科学版),2005,35(6):771-776.
[13]王香增,高潮.鄂尔多斯盆地南部长7陆相泥页岩生烃过程研究[J].非常规油气,2014,1(1):2-10.
[14]陈刚,孙建博,周立发,等.鄂尔多斯盆地西南缘中生代构造事件的裂变径迹年龄记录[J].中国科学(D辑:地球科学),2007,37(S1):110-118.
[15]任战利,张盛,高胜利,等.鄂尔多斯盆地构造热演化史及其成藏成矿意义[J].中国科学(D辑:地球科学),2007,37(S1):23-32.
[16]乔玉雷.孔隙流体对岩石物理弹性参数的影响及敏感属性参数优选:以济阳坳陷为例[J].油气地质与采收率,2011,18(3):39-43.
[17]CHEN G L,FINN C,NEELAMANI R,et al.Spectral decomposition response to reservoir fluids from a deep water reservoir[C].Technical Program Expanded,1949:1665-1669.
[18]黄饶,陈小宏,李景叶.基于谱分解的气藏识别技术与应用[J].石油地球物理勘探,2010,45(1):35-39.
[19]BURNETT M D,CASTAGNA J P,MENDEZ H E,et al.Application of spectral decomposition to gas basins in Mexico[C].Technical Program Expanded,2003:2332-2332.
[20]宋效文,马世忠,秦秋寒,等.频谱分解技术在深层致密砾岩气藏检测中的应用[J].石油地球物理勘探,2012,47(1):107-114.
[2]杨华,陶家庆,欧阳征健,等.鄂尔多斯盆地西缘构造特征及其成因机制[J].西北大学学报(自然科学版),2011,41(5):863-868.
[3]兰朝利,王建国,周晓峰,等.鄂尔多斯盆地彭阳油田侏罗系延安组油藏成藏规律[J].油气地质与采收率,2014,21(5):45-48.
[4]刘联群,刘建平,李勇,等.鄂尔多斯盆地彭阳地区侏罗系延安组油气成藏主控因素分析[J].地球科学与环境学报,2010,32(3):263-267.
[5]兰朝利,王奇,张欣.彭阳油田长3段成藏条件与成藏规律[J].西安石油大学学报(自然科学版),2016,31(2):1-10.
[6]付金华,郭正权,邓秀芹.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J].古地理学报,2005,7(1):34-44.
[7]杨华,刘自亮,朱筱敏,等.鄂尔多斯盆地西南缘上三叠统延长组物源与沉积体系特征[J].地学前缘,2013,20(2):10-18.
[8]杨华,窦伟坦,刘显阳,等.鄂尔多斯盆地三叠系延长组长7沉积相分析[J].沉积学报,2010,28(2):254-263.
[9]梁晓伟,王海红,牛小兵,等.鄂尔多斯盆地中西部延长组烃源岩评价及油-源对比[J].成都理工大学学报(自然科学版),2011,38(4):402-407.
[10]胡维强,赵靖舟,李军,等.鄂尔多斯盆地西南部上古生界烃源岩特征及其对天然气藏形成与分布的控制作用[J].天然气地球科学,2015,26(6):1068-1075.
[11]董丽红,安思谨,王变阳.鄂尔多斯盆地三叠系延长组长7、长9油页岩分布特征与油气富集关系[J].非常规油气,2014,1(1):17-21.
[12]苗建宇,赵建设,李文厚,等.鄂尔多斯盆地南部烃源岩沉积环境研究[J].西北大学学报(自然科学版),2005,35(6):771-776.
[13]王香增,高潮.鄂尔多斯盆地南部长7陆相泥页岩生烃过程研究[J].非常规油气,2014,1(1):2-10.
[14]陈刚,孙建博,周立发,等.鄂尔多斯盆地西南缘中生代构造事件的裂变径迹年龄记录[J].中国科学(D辑:地球科学),2007,37(S1):110-118.
[15]任战利,张盛,高胜利,等.鄂尔多斯盆地构造热演化史及其成藏成矿意义[J].中国科学(D辑:地球科学),2007,37(S1):23-32.
[16]乔玉雷.孔隙流体对岩石物理弹性参数的影响及敏感属性参数优选:以济阳坳陷为例[J].油气地质与采收率,2011,18(3):39-43.
[17]CHEN G L,FINN C,NEELAMANI R,et al.Spectral decomposition response to reservoir fluids from a deep water reservoir[C].Technical Program Expanded,1949:1665-1669.
[18]黄饶,陈小宏,李景叶.基于谱分解的气藏识别技术与应用[J].石油地球物理勘探,2010,45(1):35-39.
[19]BURNETT M D,CASTAGNA J P,MENDEZ H E,et al.Application of spectral decomposition to gas basins in Mexico[C].Technical Program Expanded,2003:2332-2332.
[20]宋效文,马世忠,秦秋寒,等.频谱分解技术在深层致密砾岩气藏检测中的应用[J].石油地球物理勘探,2012,47(1):107-114.