古龙南地区葡萄花油层高分辨率层序地层学研究
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摘要
古龙南地区葡萄花油层为松辽盆地大庆长垣以西岩性类油藏富集区,但受多物源体系和地层厚度变化快等因素影响,地层单元划分界限不统一,储层砂体展布规律不清楚。以高分辨率层序地层学理论为基础,利用岩心和测井曲线等资料,以不同级次湖泛面为等时界面,将葡萄花油层划分为1个长期、2个中期、13个短期基准面旋回,同时绘制了时间单元的沉积微相图。研究表明:葡萄花油层发育西部和北部两个物源影响下的河控浅水三角洲前缘亚相,微相类型主要为低水位期的连续型水下分流河道、高水位期的断续型水下分流河道和连片一坨状席状砂;葡萄花油层平面上受双物源和湖岸线距离影响,具有"东西分块、南北分带"特征,垂向上受高频基准面升降影响,发育早期快速水退、中期振荡式升降、晚期缓慢水进、末期快速水进的沉积演化序列。
Putaohua oil reservoirs in South Gulong of Songliao Basin is the lithologic oil enriched region in West Daqing Placanticline,affected by the dual source system,quick change of the formation thickness and other factors,the dividing limits of the stratigraphic units are not uniform and the distribution laws of the reservoir sandbodies are not clear.Based on the high-resolution sequence stratigraphic theory,by means of the core and well logging data and so forth,taking different-level lake flooding surfaces as the equivalent time surfaces,Putaohua oil reservoirs are divided into 1 long-term,2 middle-term and 13 short-term base level cycles,and meanwhile the sedimentary microfacies diagrams for the time units are completed.The study achievements show that the fluvial controlled shallow-water deltaic front subfacies are well developed under the influences of the western and northern provenances in Putaohua oil reservoirs,the microfacies types are mainly continuous underwater distributary channels in the low-water period,uncontinuous underwater distributary channels in the high-water period and contiguous-lump sand sheet;in the plane,the reservoirs are influenced by the double provenances and shoreline distance,thus characterized by "blocks in the eastern-western direction and strips in the northern-southern direction",in the vertical direction,influenced by the high-frequency based-level's lift and drop,the following sedimentary sequences are well developed:rapid water receded in the early stage,oscillatory rise and drop in the medium term,slow water inflow in the late and rapid water inrush in the end.
Putaohua oil reservoirs in South Gulong of Songliao Basin is the lithologic oil enriched region in West Daqing Placanticline,affected by the dual source system,quick change of the formation thickness and other factors,the dividing limits of the stratigraphic units are not uniform and the distribution laws of the reservoir sandbodies are not clear.Based on the high-resolution sequence stratigraphic theory,by means of the core and well logging data and so forth,taking different-level lake flooding surfaces as the equivalent time surfaces,Putaohua oil reservoirs are divided into 1 long-term,2 middle-term and 13 short-term base level cycles,and meanwhile the sedimentary microfacies diagrams for the time units are completed.The study achievements show that the fluvial controlled shallow-water deltaic front subfacies are well developed under the influences of the western and northern provenances in Putaohua oil reservoirs,the microfacies types are mainly continuous underwater distributary channels in the low-water period,uncontinuous underwater distributary channels in the high-water period and contiguous-lump sand sheet;in the plane,the reservoirs are influenced by the double provenances and shoreline distance,thus characterized by "blocks in the eastern-western direction and strips in the northern-southern direction",in the vertical direction,influenced by the high-frequency based-level's lift and drop,the following sedimentary sequences are well developed:rapid water receded in the early stage,oscillatory rise and drop in the medium term,slow water inflow in the late and rapid water inrush in the end.
引文
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[15]王树恒,吴河勇,辛仁臣,等.松辽盆地北部西部斜坡高台子油层三砂组沉积微相研究[J].大庆石油地质与开发,2006,25(3):10-12.
[16]孔凡亮,王德金.他拉哈-齐家地区葡萄花油层成藏特征[J].特种油气藏,2010,17(4):21-24.
[17]陈晓东,卢双舫,张节广,等.松辽盆地红岗阶地青山口组地层层序和沉积特征[J].大庆石油地质与开发,2012,31(3):41-46.
[18]李延平,滕玉红,闫议丹,等.东岭地区营城组沉积层序与沉积相辨析[J].大庆石油地质与开发,2012,31(4):12-17.
[2]Cross T A.Application of high-resolution sequence stratigraphy to reservoir analysis[C]//Proceedings of the 7th Exploration and Production Research Conference,1993,82(13):11-13.
[3]Cross T A.Controls on coal distribution in transgressive-regressive cycles,Upper Cretaceous,Western Interior,U S A[C]//Wilgaus C EC.Sea-level changes:An intergrated approach.SEPM Special Publication,1998,42(18):371-380.
[4]邓宏文.美国层序地层研究中的新学派:高分辨层序地层学[J].石油与天然气地质,1995,16(2):90-97.
[5]顾家裕.陆相盆地层序地层学格架概念及模式[J].石油勘探与开发,1995,22(4):7-10.
[6]樊太亮,李卫东.层序地层应用于陆相油藏预测的成功实例[J].石油学报,1999,20(2):12-17.
[7]邓宏文,徐长贵,王洪亮,等.陆东凹陷上侏罗统层序地层与生储盖组合[J].石油与天然气地质,1998,19(4):275-280.
[8]郑荣才,彭军.陕北志丹三角洲长6油层组高分辨率层序分析与等时对比[J].沉积学报,2002,20(1):92-100.
[9]赵翰卿.高分辨率层序地层对比与我国的小层对比[J].大庆石油地质与开发,2005,24(1):5-9,12.
[10]李景哲,张金亮,李存磊,等.层序地层学在应用中的两点误区[J].特种油气藏,2013,20(6):52-55,143.
[11]李思田,李祯,林畅松,等.含煤盆地层序地层分析的几个基本问题[J].煤田地质与勘探,1993,2l(4):1-8.
[12]纪友亮,张善文,冯建辉,等.陆相湖盆古地形可容空间的体积变化率与层序结构的关系[J].沉积学报,2005,23(4):631-638.
[13]郑荣才,彭军,吴朝容,等.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249-255.
[14]封东晓.惠民凹陷南斜坡强分割地区地层对比方法[J].特种油气藏,2014,2l(6):47-51,143.
[15]王树恒,吴河勇,辛仁臣,等.松辽盆地北部西部斜坡高台子油层三砂组沉积微相研究[J].大庆石油地质与开发,2006,25(3):10-12.
[16]孔凡亮,王德金.他拉哈-齐家地区葡萄花油层成藏特征[J].特种油气藏,2010,17(4):21-24.
[17]陈晓东,卢双舫,张节广,等.松辽盆地红岗阶地青山口组地层层序和沉积特征[J].大庆石油地质与开发,2012,31(3):41-46.
[18]李延平,滕玉红,闫议丹,等.东岭地区营城组沉积层序与沉积相辨析[J].大庆石油地质与开发,2012,31(4):12-17.
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