东濮凹陷河岸地区沙河街组沙一段沉积微相研究
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摘要
本文以沉积学、岩石学、测井学、层序地层学、构造地质学、石油地质学等理论为指导,采用“旋回对比,分级控制”的小层对比方法,系统研究了东濮凹陷河岸地区古近系沙河街组沙一段(Es1)地层特征,根据岩石学特征、沉积构造特征及测井相等相标志划分了沉积微相类型,分析预测了沉积微相及砂体展布特征,探讨了沉积微相与储层、油气分布规律的关系。
河岸地区沙一段较为发育的砂体有三套,Es1上亚段7#-9#砂体、Es1下亚段3#-4#和1#-2#两套砂体,其中沙一下4#标志层附近储层最为发育,连通性好,沿南西部及西部物源方向砂体逐渐向北、北东方向减薄尖灭。对沉积微相研究的结果表明,沙一段为一套浅湖-半深水湖-三角洲前缘-前三角洲交替沉积环境,主要发育有水下分流河道、河口砂坝、分流间湾、前缘席状砂、远砂坝等沉积微相。
在沉积微相研究基础上,结合研究区储层物性及油藏分布规律,分析认为最为有利储集相带是水下分流河道砂岩,河口坝砂岩次之。受河道迁徙冲刷影响,水下分流河道和分流间湾相间分布,形成良好生储盖组合形式。水下分流河道砂体不仅物性好,也是油气聚集有利场所,是今后勘探的主要目标,当其与构造高点得到合理配置时,常形成高产油流聚集区。
This paper according to reservoir beds of 1st member of the Shahejie formation (Es1)of Hean area in Dongpu Depression, Taking sediment logy、lithology、Logging study、sequence stratigraphy、structural geology、petroleum geology etc theories as guidance, and adopting sublayer comparison method of“cycle comparison, grading control”, Are used to systematically research stratigraphic characteristics based on the study of geological background and divisions of sub stratums. The types of sedimentary microfiches are divided and on the basis of lithological characteristics, sedimentary structure characteristics and logging fancies. The paper predicts the character and trend of the distribution of sedimentary microfiches and sand body, and discusses the relationship between microfiches and reservoir, oil and gas distribution.
There are three units relatively development of sand body of The 1st Member of Shahejie Formation in Hean-area, they are the 7#-9# of sandstone of Es1u and the 3#-4# and 1#-2# of two sandstone of Es1 d which, sand layer 4# marks nearly, reservoir most development, good connectivity, sand body gradually north, northeast thinning pointed out along the south west and west content source direction. Microfacies study of the results showed that the sedimentary environment is a period of main shallow lake-half a deep lake-delta front-former delta alternate sedimentary environment, which have been distinguished as follows subaqueous distributary river course,river-mouth bar, between tributary wan, front sheet sands, distal bar and other microfacies.
The study based on the sedimentary fancies, combined with oil and gas distribution, analyzed that the most favorable reservoir fancies belt is the underwater distributary channel sandstone, followed by mouth bar sandstone. By the influence of river course, underwater distributary channel distributes alternating with interdistributary bay which forms the principal source-reservoir-seal assemblage mode. The underwater distributary channel sand bodies which should be the main destinations of exploration of this area in the near future is not merely good physical properly, it is also favourable places for hydrocarbon accumulation. Sand-body development and structural matching is the high-yield area in the study region, oil and gas accumulation in structural highs.
河岸地区沙一段较为发育的砂体有三套,Es1上亚段7#-9#砂体、Es1下亚段3#-4#和1#-2#两套砂体,其中沙一下4#标志层附近储层最为发育,连通性好,沿南西部及西部物源方向砂体逐渐向北、北东方向减薄尖灭。对沉积微相研究的结果表明,沙一段为一套浅湖-半深水湖-三角洲前缘-前三角洲交替沉积环境,主要发育有水下分流河道、河口砂坝、分流间湾、前缘席状砂、远砂坝等沉积微相。
在沉积微相研究基础上,结合研究区储层物性及油藏分布规律,分析认为最为有利储集相带是水下分流河道砂岩,河口坝砂岩次之。受河道迁徙冲刷影响,水下分流河道和分流间湾相间分布,形成良好生储盖组合形式。水下分流河道砂体不仅物性好,也是油气聚集有利场所,是今后勘探的主要目标,当其与构造高点得到合理配置时,常形成高产油流聚集区。
This paper according to reservoir beds of 1st member of the Shahejie formation (Es1)of Hean area in Dongpu Depression, Taking sediment logy、lithology、Logging study、sequence stratigraphy、structural geology、petroleum geology etc theories as guidance, and adopting sublayer comparison method of“cycle comparison, grading control”, Are used to systematically research stratigraphic characteristics based on the study of geological background and divisions of sub stratums. The types of sedimentary microfiches are divided and on the basis of lithological characteristics, sedimentary structure characteristics and logging fancies. The paper predicts the character and trend of the distribution of sedimentary microfiches and sand body, and discusses the relationship between microfiches and reservoir, oil and gas distribution.
There are three units relatively development of sand body of The 1st Member of Shahejie Formation in Hean-area, they are the 7#-9# of sandstone of Es1u and the 3#-4# and 1#-2# of two sandstone of Es1 d which, sand layer 4# marks nearly, reservoir most development, good connectivity, sand body gradually north, northeast thinning pointed out along the south west and west content source direction. Microfacies study of the results showed that the sedimentary environment is a period of main shallow lake-half a deep lake-delta front-former delta alternate sedimentary environment, which have been distinguished as follows subaqueous distributary river course,river-mouth bar, between tributary wan, front sheet sands, distal bar and other microfacies.
The study based on the sedimentary fancies, combined with oil and gas distribution, analyzed that the most favorable reservoir fancies belt is the underwater distributary channel sandstone, followed by mouth bar sandstone. By the influence of river course, underwater distributary channel distributes alternating with interdistributary bay which forms the principal source-reservoir-seal assemblage mode. The underwater distributary channel sand bodies which should be the main destinations of exploration of this area in the near future is not merely good physical properly, it is also favourable places for hydrocarbon accumulation. Sand-body development and structural matching is the high-yield area in the study region, oil and gas accumulation in structural highs.
引文
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[2]常振恒.河岸地区沙一、二段资源潜力及勘探开发整体部署意见[R].濮阳:中原油田勘探开发研究院,2002.
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[4]文慧俭.大庆长垣北部高台子油层沉积微相研究[D].大庆石油学院硕士学位论文, 2009.
[5]冯增昭等著.中国沉积学[M].北京:石油工业出版社,1994.
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[7]胡望水.测井曲线在沉积微相研究中的应用[J].西部探程,2010,7:61~64.
[8]梁桂蓉,黄晓红,赵宪生.利用地震波多参数组合预测沉积微相研究[J].地震研究,2004,27(3):252~255.
[9]秦亚玲,计平,郑宇霞.神经网络自动识别沉积微相在胡状集油田的应用[J].断块油气田,2001, 8(1):10~12.
[10]陈钢花,申辉林,雍世和.应用数理统计方法自动解释地层岩性及沉积微相[J].石油大学学报,1996, 20(4):26~29.
[11]王威,李臻,田敏等.岩性一地层油气藏勘探方法技术研究现状及进展[J].岩性油气藏,2009, 21(2):121~125.
[12]费宝生.隐蔽油气藏的勘探[J].油气地质与采油率,2002,9(6):29~32.
[13]常振恒.河岸地区油气成藏条件及勘探开发潜力评价[R].濮阳:中原油田勘探开发研究院,2002.
[14]李令喜.东濮凹陷河岸地区构造演化与油气聚集规律研究[D].中国地质大学(北京)硕士学位论文,2006.
[15]于兴河.东濮凹陷北部盐湖盆地沙三段沉积体系与控砂机制研究[R].北京:中国地质大学2008.
[16]程秀申.河南东濮凹陷构造样式分析[J].现代地质,2009, 23(3):414~422.
[17]王秀林.东濮凹陷文南地区沙二下段储层展布与有利目标评价[R].濮阳:中原油田勘探开发研究院,2008.
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[19]苏惠,曲丽萍,张金川等.裂陷盆地构造演化及盆地伸展模式-东濮凹陷为例[J].石油与天然气地质,2006,27(1):70~77.
[20]胥菊珍,张孝义,张虹等.东濮凹陷北部古近系与盐岩有关的油气藏类型[J].石油与天然气地质,2003,24(2):152~156.
[21]禹金营,张洪安,慕小水.东濮凹陷盐岩沉积模式研究[J].江汉石油学院学报,2003,25报,2003,25(3):40~42.
[22]李丽丽.喇嘛甸油田储层单砂体识别方法研究[D].大庆石油学院硕士学位论文, 2009.
[23]王俊玲,任纪舜.嫩江现代河流沉积体岩相及内部构形要素分析[J].地质科学,2001,36(4):385~394.
[24]廖金华,翟勇,梁君霞.密井网条件下河流相储层单一成因砂体的识别及其意义[J].内蒙古石油化工,2007,12:407~409.
[25]赵翰卿,付志国,吕晓光,等.大型河流-三角洲沉积储层精细描述方法[J].石油学报,2000,21(4):109-113.
[26]苏惠.东濮凹陷浅层成藏条件与分布规律研究[R].濮阳:中原油田勘探开发研究院,2007.
[27]屠志慧,成世琦,慈建发.有利砂体识别与解释[J].西南石油学院学报,2005, 27(1):24~27.
[28] Horning J,Aigner T.Reservoir architecture in a terminal alluvial plain anoutcrop analogue study[J].JPG.2002, 25(1):3~30.
[29]熊运斌,杨建文,陈云英等.文南油田开发中后期沉积微相精细研究[J].石油勘探与开发,2003,30(2):482~497.
[30]常振恒.东濮凹陷沙一段成藏条件分析与勘探目标评价[R].濮阳:中原油田勘探开发研究院,2004.
[31]杨军,张春生,杨薇.刘庄地区沙一段储层特征及影响因素分析[J].西安石油大学学报(自然科学版) ,2010,25(3):19~22.
[32]常振恒,蒋有录,鲁雪松.文南-刘庄地区沙一段油气层“四性”关系研究[J].内蒙古石油化工,2003,29:152~153.
[33] Bloeh S,Franks SG.Preservation of shallow plagioclas n dissolution porosity dur- ing burial; implications for porosity prediction and aluminum mass balance[J].AA PG Bulletin,1993,77(7):1488~1501.
[34]马朋善,严海波,曾忠玉等.刘庄油田孔隙发育影响因素分析[J].特种油气藏,2006,13(5):52~55.
[35]姜在兴.沉积学[M]..北京:石油工业出版社,2003.
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