东濮凹陷文南油田文138断块沙二段下亚段层序地层
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摘要
运用基准面旋回原理,通过岩心、录井、测井和地震资料的综合分析,在东濮凹陷文南油田文138井沙二段下亚段中识别出3种基本结构类型和7个亚类型的短期基准面旋回层序。其中,向上"变深"的非对称型主要发育在距物源区较近或物源供给较充分的三角洲前缘中的分流水道、河道间湾沉积区;向上"变浅"的非对称型发育在距物源供给区相对较远但供给量逐渐增多的三角洲前缘中的河口坝、远砂坝沉积区;向上"变深"复"变浅"的对称型往往发育于沉积速率始终小于可容纳空间增长率的三角州前缘区。研究结果表明,文138井沙二段下亚段发育中期基准面旋回(4级)14个,短期旋回(5级)40个,超短期旋回(6级)92个;单个中期基准面旋回的厚度一般为18~32m,单个超短期旋回的厚度平均为4m。
Based on the base-level cycles,three types of basic structure and seven subtypes of short-term base-level cyclical sequences were recognized through comprehensive analysis of cores,well-logging and seismic information in the lower part of the second member of Shahejia Formation in Well Wen 138,Dongpu Depression.The up-depthening nonsymmetry types were mainly developed at the distributary channel and inter-distributary bay of delta front with supplies abundant and short distance from source area to sedimentary province.The up-shallowening nonsymmetry types were grown in the river bar and distal sand bar of the delta front with long distance from source area to sedimentary province,and the supplies gradually increased.The up-depthening to up-shallowening symmetry types were produced in the delta front with rate of sedimentation continuously smaller than that of the accommodation space increasing.14 mid-terms,40 short-terms,and 92 supershort-terms base-level cyclical sequences were classified.The thickness of a middle-term base-level cyclical sequences is 18 to 32m,and that of a supershort-term base-level cyclical sequences is 4m.
Based on the base-level cycles,three types of basic structure and seven subtypes of short-term base-level cyclical sequences were recognized through comprehensive analysis of cores,well-logging and seismic information in the lower part of the second member of Shahejia Formation in Well Wen 138,Dongpu Depression.The up-depthening nonsymmetry types were mainly developed at the distributary channel and inter-distributary bay of delta front with supplies abundant and short distance from source area to sedimentary province.The up-shallowening nonsymmetry types were grown in the river bar and distal sand bar of the delta front with long distance from source area to sedimentary province,and the supplies gradually increased.The up-depthening to up-shallowening symmetry types were produced in the delta front with rate of sedimentation continuously smaller than that of the accommodation space increasing.14 mid-terms,40 short-terms,and 92 supershort-terms base-level cyclical sequences were classified.The thickness of a middle-term base-level cyclical sequences is 18 to 32m,and that of a supershort-term base-level cyclical sequences is 4m.
引文
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[3]吕新华,陈开远,陈新军,等.东濮凹陷文西斜坡古盐湖沉积的油气储层预测[J].盐湖研究,2003,11(1):45-61.
[4]王洪亮,邓宏文.东濮凹陷濮卫环洼带层序划分与沉积体系[J].古地理学报,2000,2(1):49-53.
[5]吴东胜,郭建华,刘生国.T-R旋回层序在东濮凹陷前梨园地区Es33亚段储层研究中的应用[J].矿物岩石,2001,21(2):42-46.
[6]陈发亮,朱晖,李绪涛,等.东濮凹陷下第三系沙河街组层序地层划分及岩盐成因探讨[J].沉积学报,2000,18(3):384-388.
[7]胥菊珍,蒋飞虎,张孝义,等.河南东濮凹陷古近系沙河街组盐岩沉积特征及成因[J].古地理学报,2003,5(2):162-170.
[8]赵祥春,纪友亮,赵俊青.东濮凹陷下第三系沙三段高频层序地层学模式[J].油气地质与采收率,2003,10(1):6-8.
[9]邓君.东濮凹陷毛岗地区水下扇体的沉积特征[J].内蒙古石油化工,2002,29(2):167-169.
[10]呼舜兴,耿师江,侯平舒,等.非均质复杂断块油藏沉积微相研究及应用[J].西安石油学院学报:自然科学版,2003,18(4):23-25.
[11]胡玉杰,高协为,黄红兵.东濮凹陷西洼北部沉积体系与含油气性[J].断块油气田,2001,8(1):7-11.
[12]林又玲,吴贤涛,潘结南,等.东濮凹陷老第三系沙河街组盐类沉积模式新见[J].古地理学报,2000,2(4):66-75.
[13]史忠生,陈开远,何胡军,等.锶同位素在沉积环境分析方面的应用[J].石油与天然气地质,2003,24(2):187-192.
[14]谢英刚,郭建华,蒋小琼,等.东濮凹陷沙三段与沙二段接触关系讨论[J].油气地质与采收率,2003,10(6):3-5.
[15]李伟,冷济高,宋东勇.文留地区盐间泥岩裂缝油气藏成藏作用[J].油气地质与采收率,2006,13(3):31-34.
[16]邓宏文,王洪亮,李熙喆.层序地层地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177-184.
[17]郑荣才,彭军,吴朝容.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.
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