玛湖凹陷北斜坡百口泉组层序地层格架
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摘要
玛湖凹陷北斜坡百口泉组油藏开发过程中油水分布规律复杂,开发过程中开发层系划分和储层砂体对比存在诸多矛盾。以岩心、测井、地震资料为基础,以层序地层学理论为指导,结合地震剖面反射特征开展三叠系百口泉组层序地层划分和对比,并建立统一层序地层格架,为油藏开发层系划分和储层砂体对比提供依据。玛北地区百口泉组划分为1个长期基准面旋回,呈现为基准面上升及湖侵的特征;可进一步细分为MSC1、MSC2、MSC3等3个中期旋回,其中MSC2旋回厚度最大,为最有利含油层段,垂向上多层含油,T_1b_2~2、T_1b_2~1为主力油层。玛北地区百口泉组层序发育与演化明显受控于构造作用,自盆地边缘向盆地方向存在外坡折、中坡折和内坡折三个坡折带。通过建立统一的三叠系百口泉组层序地层格架为油藏开发层系划分和储层砂体对比提供依据,指导剩余油挖潜和加密井部署。
The oil-water distribution of the Baikouquan Formation reservoirs in the northern slope of the Mahu Sag is complex.There are many differences between development layer division and correlation of reservoir sand bodies.Guided by the theory of sequence stratigraphy,the sequence stratigraphy of the Baikouquan Formation in Triassic was divided and correlated combined with reflection characters of seismic profile based on core,well logging and seismic data.Unified sequence stratigraphic framework was made,which provides basis for development layer division and correlation of reservoir sand bodies.In Mabei area,Baikouquan Formation was divided into one long-term base-level cycle with the characteristics of base-level rising and lake transgression.It can be divided into MSC1,MSC2 and MSC3 three medium-term cycles.Among them,MSC2 cycle with the largest thickness is the most favorable oil-bearing interval,and many vertical layers are oil-bearing with the main pays of T1 b22 and T1 b21.The sequence development and evolution of the Baikouquan Formation was controlled by tectonic action in Mabei area.From the edge of the basin to the basin,there were outer,middle and inner three slope break belts.The unified Triassic Baikouquan Formation sequence stratigraphic framework provides a basis for the development layer division and correlation of reservoir sand bodies,and guides tapping the potential of remaining oil and infill well deployment.
The oil-water distribution of the Baikouquan Formation reservoirs in the northern slope of the Mahu Sag is complex.There are many differences between development layer division and correlation of reservoir sand bodies.Guided by the theory of sequence stratigraphy,the sequence stratigraphy of the Baikouquan Formation in Triassic was divided and correlated combined with reflection characters of seismic profile based on core,well logging and seismic data.Unified sequence stratigraphic framework was made,which provides basis for development layer division and correlation of reservoir sand bodies.In Mabei area,Baikouquan Formation was divided into one long-term base-level cycle with the characteristics of base-level rising and lake transgression.It can be divided into MSC1,MSC2 and MSC3 three medium-term cycles.Among them,MSC2 cycle with the largest thickness is the most favorable oil-bearing interval,and many vertical layers are oil-bearing with the main pays of T1 b22 and T1 b21.The sequence development and evolution of the Baikouquan Formation was controlled by tectonic action in Mabei area.From the edge of the basin to the basin,there were outer,middle and inner three slope break belts.The unified Triassic Baikouquan Formation sequence stratigraphic framework provides a basis for the development layer division and correlation of reservoir sand bodies,and guides tapping the potential of remaining oil and infill well deployment.
引文
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[3]雷德文,陈刚强,刘海磊,等.准噶尔盆地玛湖凹陷大油(气)区形成条件与勘探方向研究[J].地质学报,2017,91(7):1604-1619.
[4]匡立春,唐勇,雷德文,等.准噶尔盆地玛湖凹陷斜坡区三叠系百口泉组扇控大面积岩性油藏勘探实践[J].中国石油勘探,2014,19(6):14-23.
[5]潘建国,郝芳,谭开俊,等.准噶尔盆地红车断裂带古生界火山岩油气藏特征及成藏规律[J].岩性油气藏,2007,19(2):53-57.
[6]史基安,何周,丁超,等.准噶尔盆地西北缘克百地区二叠系沉积特征及沉积模式[J].沉积学报,2010,28(5):121-127.
[7]张顺存,蒋欢,张磊,等.准噶尔盆地玛北地区三叠系百口泉组优质储层成因分析[J].沉积学报,2014,32(6):1171-1180.
[8]黄云飞,张昌民,朱锐,等.准噶尔盆地玛湖凹陷晚二叠世至中三叠世古气候、物源及构造背景[J].地球科学,2017,42(10):1736-149.
[9] GALLOWAY W E.Siliciclastic Slope and Base-of-slope Depositional Systems:Component Facies,Stratigraphic Architecture,and Classification[J].AAPG Bulletin,1998,82(4):569-595.
[10] POSAMENTIER H W.Siliciclastic Sequence Stratigraphy and Petroleum Geology-where to From Here?[J].AAPG Bulletin,1993,77:731-742.
[11]曹耀华.准噶尔盆地陆西莫北地区侏罗系精细沉积相研究[R].新疆石油管理局勘探开发研究院,1999.
[12]曹耀华.准噶尔盆地中拐地区侏罗系砂组及油层沉积相研究[R].新疆石油管理局勘探开发研究院,2001.
[13]罗安屏.准噶尔盆地侏罗系沉积特征及其与油气生成储集的关系[R].新疆石油管理局勘探开发研究院,1994.
[14]齐雪峰,王英明.准噶尔盆地侏罗系层序地层及油气成藏研究[R].新疆石油局研究院,2000.
[15]孙海宁,王洪宝,欧浩文.砂砾岩储层地震预测技术[J].天然气工业,2007,27(增A):397-398.
[16]威尔格斯C K.层序地层学原理[M].徐怀大,译.北京:石油工业出版社,1993.