辽河油田欢2-16-304井区精细油藏描述
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摘要
论文运用高分辨率层序地层学理论为指导,从岩心资料、钻/测井资料、录井资料着手,将欢2-16-304井区大凌河油层划分为2个中期层序旋回,结合中、短期基准面旋回,划分出3个砂岩组(大Ⅱ_1、大Ⅱ_2、大Ⅱ_3),6个小层(大Ⅱ_(11)、大Ⅱ_(12)、大Ⅱ_(21)、大Ⅱ_(22)、大Ⅱ_(31)、大Ⅱ_(32))。
沉积地质分析认为,研究区大Ⅱ油层组主要为湖底扇相沉积,发育了一套灰色至浅灰色的粉、细砂岩、砂砾岩和泥岩的互层。湖底扇相可进一步划分为辫状沟道、辫状沟道间、沟道前缘等微相。纵向上大Ⅱ_3以发育辫状沟道为主,岩性以砂砾岩为主,大Ⅱ_2主要以砂泥岩互层为主,大Ⅱ_1时期以湖相泥岩为主,少部分发育薄层砂岩。平面上主要为中扇亚相沉积,辫状沟道砂岩是其主要的储层。
油水分布规律的研究表明,研究区南北向油藏受断层控制明显,含油层位多,含油丰富,是研究区开采的重点地区。东西向油水规律变化不连续,油水分布受地层岩性的影响较大。垂向上大Ⅱ_1、大Ⅱ_2以油层为主,大Ⅱ_(31)、大Ⅱ_(32)多为油层或水层。平面上受研究区的地形影响,油水界面表现为由西北向东南的逐渐变深。其中1类有利含油区主要位于沿区域近东西向断层下降盘展布的狭长条带,2类有利含油区主要位于研究区中部地带,3类有利含油区主要位于研究区南部,呈条带状展布,4号有利含油区主要位于研究区北部断层上升盘一侧的狭长区域。
最终在对全区100口井测井解释成果分析、地震解释以及储层反演的基础上,对研究区进行地质建模与数值模拟,对研究区的剩余油分布规律进行了讨论。分析表明研究区剩余油主要分布在区块西北部和北部,构造与断层是研究区剩余油主要的控制因素,剩余油主要集中在构造的高部位以及断层附近,微幅度构造控制局部地区剩余油分布,是下一步调整挖潜的有利区域。
This paper divides Dalinghe reservoir of Block Huan 2-16-304 into 2 middle-term sequences by using the high resolution sequence stratigraphy theory,and identifies 3 sandstone groups which named DaⅡ_1,DaⅡ_2 and DaⅡ_3 and 6 small layers which named DaⅡ_(11),DaⅡ_(12),DaⅡ_(21),DaⅡ_(22),DaⅡ_(31) and DaⅡ_(32).
Sedimentary geology analysis shows that turbiditic fan develops in study area, which is further divided into braided channel,interbraided channel and channel front. Braided channel mainly develops in DaⅡ_3,whose lithology is glutinite,while the lithology of DaⅡ_2 are sandstone interbedded occasionally with mudstone,and mudstone mainly deposits in DaⅡ_1 which formed in the lake environment.Middle fan is the main depositional type and braided channel is the main reservoir.
The study of oil distribution shows that the oil pools which develop along the north to the south are controlled by the fault in study area,and with abundant oil, where is the key developing area.Oil distribution along the east to the west changes discontinuously and is mainly controlled by lithology.In vertical,DaⅡ_1 and and DaⅡ_2 are oil layers,DaⅡ_(31) and DaⅡ_(32) are water layers.As the influence of terrain in study area,the boundary of oil and water becomes deep from northwest to southeast. At the end,four types of favorable oil areas are identified.
On the basis of analysis of logging and seismics,this paper founds geology models and numerical simulation,and discusses the remaining oil distribution in study area.The results show that the remaining oil distributes mostly in the northwest and north of study area,faults and tectonics are the main controlling factors.The remaining oil is accumulated at the high place and beside the faults where are the key exploration areas in the future.
沉积地质分析认为,研究区大Ⅱ油层组主要为湖底扇相沉积,发育了一套灰色至浅灰色的粉、细砂岩、砂砾岩和泥岩的互层。湖底扇相可进一步划分为辫状沟道、辫状沟道间、沟道前缘等微相。纵向上大Ⅱ_3以发育辫状沟道为主,岩性以砂砾岩为主,大Ⅱ_2主要以砂泥岩互层为主,大Ⅱ_1时期以湖相泥岩为主,少部分发育薄层砂岩。平面上主要为中扇亚相沉积,辫状沟道砂岩是其主要的储层。
油水分布规律的研究表明,研究区南北向油藏受断层控制明显,含油层位多,含油丰富,是研究区开采的重点地区。东西向油水规律变化不连续,油水分布受地层岩性的影响较大。垂向上大Ⅱ_1、大Ⅱ_2以油层为主,大Ⅱ_(31)、大Ⅱ_(32)多为油层或水层。平面上受研究区的地形影响,油水界面表现为由西北向东南的逐渐变深。其中1类有利含油区主要位于沿区域近东西向断层下降盘展布的狭长条带,2类有利含油区主要位于研究区中部地带,3类有利含油区主要位于研究区南部,呈条带状展布,4号有利含油区主要位于研究区北部断层上升盘一侧的狭长区域。
最终在对全区100口井测井解释成果分析、地震解释以及储层反演的基础上,对研究区进行地质建模与数值模拟,对研究区的剩余油分布规律进行了讨论。分析表明研究区剩余油主要分布在区块西北部和北部,构造与断层是研究区剩余油主要的控制因素,剩余油主要集中在构造的高部位以及断层附近,微幅度构造控制局部地区剩余油分布,是下一步调整挖潜的有利区域。
This paper divides Dalinghe reservoir of Block Huan 2-16-304 into 2 middle-term sequences by using the high resolution sequence stratigraphy theory,and identifies 3 sandstone groups which named DaⅡ_1,DaⅡ_2 and DaⅡ_3 and 6 small layers which named DaⅡ_(11),DaⅡ_(12),DaⅡ_(21),DaⅡ_(22),DaⅡ_(31) and DaⅡ_(32).
Sedimentary geology analysis shows that turbiditic fan develops in study area, which is further divided into braided channel,interbraided channel and channel front. Braided channel mainly develops in DaⅡ_3,whose lithology is glutinite,while the lithology of DaⅡ_2 are sandstone interbedded occasionally with mudstone,and mudstone mainly deposits in DaⅡ_1 which formed in the lake environment.Middle fan is the main depositional type and braided channel is the main reservoir.
The study of oil distribution shows that the oil pools which develop along the north to the south are controlled by the fault in study area,and with abundant oil, where is the key developing area.Oil distribution along the east to the west changes discontinuously and is mainly controlled by lithology.In vertical,DaⅡ_1 and and DaⅡ_2 are oil layers,DaⅡ_(31) and DaⅡ_(32) are water layers.As the influence of terrain in study area,the boundary of oil and water becomes deep from northwest to southeast. At the end,four types of favorable oil areas are identified.
On the basis of analysis of logging and seismics,this paper founds geology models and numerical simulation,and discusses the remaining oil distribution in study area.The results show that the remaining oil distributes mostly in the northwest and north of study area,faults and tectonics are the main controlling factors.The remaining oil is accumulated at the high place and beside the faults where are the key exploration areas in the future.
引文
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Hardy S, Fordm. Numerical modeling of trishear fault propagation folding. Tectonics, 1997, 16: 841-854
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Cross T. A, Lessenger M .A. Sediment volume partitioning: rationale for stratigraphic model evaluation and high-resolution stratigraphic correlation. NPF Special Publication, 1998, 8 :171-195
Cross T. A. The reservoir characterization and pool-forming patterns in terrestrial formation of china. Earth Science Frontiers, 2000, 7(4): 322-350
Emanuel A. S, Alameda G. K, Behrens R. Aet al. Reservoir performance prediction method based on fractal geostatistics. SPE. 1989, 8: 311-318
Finch E, Hardy S, Gawthorpe R. Discrete element modeling of contractional fault-propagation folding above rigid basement fault blocks. Journal of Structural Geology, 2003, 25: 515-528
Galloway W E. Genetic stratigraphic sequences in basin analysis I : Architecture and flooding - surface bounded depositional units. AAPG Bulletin. 1989, 73 (1) : 125-142
Geehan G W. Geological prediction of shale continuity in Prudhoe Bay Field, Reservoir Characterization. Orlando: Academic Press, 1986, 435-444
Haldorsen H H, Damsleth E. Stochastic modeling. JPT. 1990, 404-412
Hardy S, Fordm. Numerical modeling of trishear fault propagation folding. Tectonics, 1997, 16: 841-854
Journel A G, Alabert F G. Focusing on spatial connectivity of extreme - valued attributes: stochastic indicator modes of reservoir heterogeneity. SPE, 1988, 34-45
Journel A G, Isaaks E. Conditional indicator simulation: application to a Saskatchewan uranium deposit. Math Geology, 1984, 16(7): 655-718
Journel A G, Posa D. Characteristic behavior and order relations for indicator variograms. Math Geology,1990,22(8):685-718
Matheron G,Beucher H,De Fouguet C et al.Conditional Simulation of the geometry of flurideltaic resole.Texas:SPE Annual Conference,1987,591-599
陈欢庆,朱玉双,李庆印等.安塞油田杏河区长6油层组沉积微相研究.西北大学学报(自然科学版),2006,36(2):295-300
陈建阳,于兴河,张志杰等.储层地质建模在油藏描述中的应用.庆石油地质与开发,2005,24(3):17-19
陈伟,张百忍,李鹏等.大庆升平油田葡萄花油层沉积微相特征研究.石油天然气学报,2008,30(6):194-197
陈伟,彭承文,李鹏.宋芳屯油田肇35区块葡萄花油层沉积相研究.第四届全国沉积学大会论文集,2008:65-72
陈月明.油藏数值模拟基础.东营:石油大学出版社,1989
邓宏文,王红亮.沉积物体积分配原理—高分辨率层序地层学的理论基础.地学前缘.1998,7(4):305-313
邓宏文,王洪亮,李熙哲.层序地层地层基准面的识别、对比技术及应用.石油与天然气 地质,1996,17(3):177-184
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