不整合面剥蚀量恢复及其构造意义——以贝南凹陷T_(22)不整合面为例
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摘要
文中综合应用声波时差法和地震反射结构外延法对T22不整合面进行剥蚀趋势恢复,进而探讨其构造活动强度及对油气运移和成藏的影响。研究表明,剥蚀厚度沿主干断裂边缘及古隆起斜坡带呈NE—SW向分布,最大剥蚀厚度位于南部苏德尔特断隆东缘,可达900 m,紧邻斜坡的低洼处剥蚀较小,约150 m。剥蚀量大小和分布形态与区域构造活动密切相关,南屯组末期,由于受来自NW—SE方向挤压应力作用,造成先存的同沉积断裂发生构造反转。反转断裂沟通底部油源向上运移,在断隆高部位,由于剥蚀较大而造成早期油气散失,而斜坡部位则由于反转适度,有利于油气的保存,其中贝8、贝3等5口井出现工业油流,其余4口亦出现良好的油气显示。因此,预测贝南斜坡带是下一步油气勘探的重要区带。
This paper built up the erosion estimates of T22 unconformity boundary and discussed the effects caused by erosion on the migration and accumulation of hydrocarbon by using the method of interval transit time and the characteristics of seismic reflection.The results show that the erosion thickness mostly distributes along the edge of main faults and the slope of ancient uplift,oriented in NE-SW trending.The maximum thickness of 900 m is sited on the rim of Sudeerte Fault,while the minimum thickness is about 150 m in the low-lying position close to the slope.The amount and the distribution patterns of erosion are closely related to regional tectonic activities.In the final sedimentary stage of Nantun Formation,compressed by NW-SE trending stress,the pre-existing synsedimentary faulting was reversed.The hydrocarbon migrated upward because of reverse fault.In the high position of fault uplift,the oil and gas dissipated due to the early erosion,while the slope was conducive to the preservation of hydrocarbon owing to proper reversing.There were commercial oil flows in some wells such as B8 and B3,etc.There were oil and gas shows in the other wells in the slope position.So it is predicted that the slope zone is an important target for next oil and gas exploration.
This paper built up the erosion estimates of T22 unconformity boundary and discussed the effects caused by erosion on the migration and accumulation of hydrocarbon by using the method of interval transit time and the characteristics of seismic reflection.The results show that the erosion thickness mostly distributes along the edge of main faults and the slope of ancient uplift,oriented in NE-SW trending.The maximum thickness of 900 m is sited on the rim of Sudeerte Fault,while the minimum thickness is about 150 m in the low-lying position close to the slope.The amount and the distribution patterns of erosion are closely related to regional tectonic activities.In the final sedimentary stage of Nantun Formation,compressed by NW-SE trending stress,the pre-existing synsedimentary faulting was reversed.The hydrocarbon migrated upward because of reverse fault.In the high position of fault uplift,the oil and gas dissipated due to the early erosion,while the slope was conducive to the preservation of hydrocarbon owing to proper reversing.There were commercial oil flows in some wells such as B8 and B3,etc.There were oil and gas shows in the other wells in the slope position.So it is predicted that the slope zone is an important target for next oil and gas exploration.
引文
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[13]李宏义,姜振学,董月霞,等.冀东油田南堡2号构造古潜山成藏条件及模式[J].断块油气田,2010,17(6):678-681.Li Hongyi,Jiang Zhenxue,Dong Yuexia,et al.Buried-hill reservoir forming conditions and models in Nanpu No.2structure,Jidong Oilfield[J].Fault-Block Oil&Gas Field,2010,17(6):678-681.
[14]高长海,张新征,林玉.不整合对油气藏的破坏作用[J].石油地质与工程,2010,24(2):25-28.Gao Changhai,Zhang Xinzheng,Lin Yu.Destructive effects of unconformity towards oil and gas reservoirs[J].Petroleum Geology and Engineering,2010,24(2):25-28.
[15]牛会玲,谢润成,戴建文,等.靖边气田盒8段储层特征及控制因素[J].石油地质与工程,2010,24(1):16-19.Niu Huiling,Xie Runcheng,Dai Jianwen,et al.Reservoir characteristics and its controlling factors of H8formation in Jingbian Gas Field[J].Petroleum Geology and Engineering,2010,24(1):16-19.
[2]赵刚,张群,王兴亚,等.贝尔凹陷南二段油成藏的地质条件[J].大庆石油学院学报,2010,33(4):9-12.Zhao Gang,Zhang Qun,Wang Xingya,et al.Favorable geological conditions of oil accumulation in K 1 n 2 in Beier Depression[J].Journal of Daqing Petroleum Institute,2010,33(4):9-12.
[3]付广,许泽剑,韩冬玲,等.不整合面在油气藏形成中的作用[J].大庆石油学院学报,2001,25(1):1-4.Fu Guang,Xu Zejian,Han Dongling,et al.Role of surface of unconformity in formation of oil or gas reservoirs[J].Journal of Daqing Petroleum Institute,2001,25(1):1-4.
[4]何登发.不整合面的结构与油气聚集[J].石油勘探与开发,2007,34(2):142-149.He Dengfa.Structure of unconformity and its control on hydrocarbon accumulation[J].Petroleum Exploration and Development,2007,34(2):142-149.
[5]Athy L F.Density,porosity and compaction of sedimentary rocks[J].AAPG Bulletin,1930,14(1):1-24.
[6]胡少华.基于地震资料的构造-沉积综合分析法:一种剥蚀厚度恢复新方法[J].石油地球物理勘探,2004,39(4):478-483.Hu Shaohua.Integrative structural-sedimentary analysis method based on seismic data:a new method for restoring denuded thickness[J].Oil Geophysical Prospecting,2004,39(4):478-483.
[7]林畅松.沉积盆地的构造地层分析:以中国构造活动盆地研究为例[J].现代地质,2006,20(2):185-194.Lin Changsong.Tectono-stratigraphic analysis of sedimentary basins:A case study on the inland tectonically active basins in China[J].Geoscience,2006,20(2):185-194.
[8]Magara K.Thickness of removed sedimentary rocks,paleoporepressure,and paleotemperature,southwestern part of Western Canada Basin[J].AAPG Bulletin,1976,60(4):554-565.
[9]彭清华,周江羽,揭异新.声波时差法对南堡凹陷东营组剥蚀量的恢复[J].断块油气田,2009,16(6):50-53.Peng Qinghua,Zhou Jiangyu,Jie Yixin.Erosion thickness restoration of Dongying Formation reservoir in Nanpu Depression by using interval transit time method[J].Fault-Block Oil&Gas Field,2009,16(6):50-53.
[10]李占东,李阳,张海翔,等.海拉尔盆地乌尔逊—贝尔凹陷大磨拐河组油气成藏条件[J].石油实验地质,2011,33(5):480-487.Li Zhandong,Li Yang,Zhang Haixiang,et al.Petroleum accumulation conditions of Damoguaihe Formation in Urxun-Beier Sags,Hailaer Basin[J].Petroleum Geology&Experiment,2011,33(5):480-487.
[11]付广,刘雪雪.三肇凹陷扶杨油层成藏要素空间匹配与油分布关系[J].断块油气田,2010,17(5):533-536.Fu Guang,Liu Xuexue.Relation between space matching of oil accumulation factors and oil distribution in Fuyang Oil Layer of Sanzhao Depression[J].Fault-Block Oil&Gas Field,2010,17(5):533-536.
[12]王运所,刘亚洲,贾斌峰,等.东濮凹陷庆祖集地区断裂对油气成藏控制作用浅析[J].断块油气田,2010,17(3):304-308.Wang Yunsuo,Liu Yazhou,Jia Binfeng,et al.Control of fracture system on hydrocarbon pooling in Qingzuji Region of Dongpu Depression[J].Fault-Block Oil&Gas Field,2010,17(3):304-308.
[13]李宏义,姜振学,董月霞,等.冀东油田南堡2号构造古潜山成藏条件及模式[J].断块油气田,2010,17(6):678-681.Li Hongyi,Jiang Zhenxue,Dong Yuexia,et al.Buried-hill reservoir forming conditions and models in Nanpu No.2structure,Jidong Oilfield[J].Fault-Block Oil&Gas Field,2010,17(6):678-681.
[14]高长海,张新征,林玉.不整合对油气藏的破坏作用[J].石油地质与工程,2010,24(2):25-28.Gao Changhai,Zhang Xinzheng,Lin Yu.Destructive effects of unconformity towards oil and gas reservoirs[J].Petroleum Geology and Engineering,2010,24(2):25-28.
[15]牛会玲,谢润成,戴建文,等.靖边气田盒8段储层特征及控制因素[J].石油地质与工程,2010,24(1):16-19.Niu Huiling,Xie Runcheng,Dai Jianwen,et al.Reservoir characteristics and its controlling factors of H8formation in Jingbian Gas Field[J].Petroleum Geology and Engineering,2010,24(1):16-19.
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