辽东湾辽中凹陷中部古近系东营组震浊积岩特征研究
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摘要
辽东湾辽中凹陷中部古近系东营组地层中发育多期大规模浊积扇,利用岩芯、薄片、测井及地震资料,对这些浊积岩及其下伏地层的沉积成岩特征、沉积构造和岩石类型分析,认为研究区东营组浊积岩与典型的原地震积岩伴生,属于地震成因的浊积岩。这些浊积扇的扇中以长石砂岩和岩屑长石砂岩为主,埋深一般在1 500 m~2 500 m左右,为早成岩演化B1期,测井解释孔隙度平均为27.5%,储层物性良好,并且具有良好的生储盖组合,钻探证实其良好的含油气性。此类浊积扇与地震活动紧密相关,其分布具有一定的等时性,因此可以推测渤海海域郯庐断裂两侧在活跃期发育的大规模浊积扇,具有良好的岩性油气藏勘探前景。
Large-scale Paleogene turbidite fan of multiple stages is developed in the Dongying Formation of central Liaozhong depression,Liaodong bay.In this paper,the sedimentation and diagenesis characters,sedimentary structure and rock types of turbidite and underlying layer are analyzed by using cores,slice,well-logging and seismic data.It is believed that the turbidite in Dongying Formation is associated with typical seismoturbidite and is induced by earthquake.The middle of the turbidite fan is dominated by arkose and lithic arkose,with burial depth of 1 500 m~2 500 m,and was fell under early diagenetic B1 stage.Well logging interpretation reveals that the average porosity is 27.5%.The physical property of reservoir is of good,with favorable source-reservoir-cap assemblage.Well drillings further proves that its oil bearing property is satisfactory.This kind of turbidite fan is closely related with earthquake and distributed isochronously in some degree.So it can be inferred that large scale turbidite fan is developed in the centre of the lake basin at both sides of the Tanlu fault in Bohai area during active fracturing period.
Large-scale Paleogene turbidite fan of multiple stages is developed in the Dongying Formation of central Liaozhong depression,Liaodong bay.In this paper,the sedimentation and diagenesis characters,sedimentary structure and rock types of turbidite and underlying layer are analyzed by using cores,slice,well-logging and seismic data.It is believed that the turbidite in Dongying Formation is associated with typical seismoturbidite and is induced by earthquake.The middle of the turbidite fan is dominated by arkose and lithic arkose,with burial depth of 1 500 m~2 500 m,and was fell under early diagenetic B1 stage.Well logging interpretation reveals that the average porosity is 27.5%.The physical property of reservoir is of good,with favorable source-reservoir-cap assemblage.Well drillings further proves that its oil bearing property is satisfactory.This kind of turbidite fan is closely related with earthquake and distributed isochronously in some degree.So it can be inferred that large scale turbidite fan is developed in the centre of the lake basin at both sides of the Tanlu fault in Bohai area during active fracturing period.
引文
[1]杨剑萍,陈顺霞,查明,等.惠民凹陷中央隆起带古近系地震浊积岩特征研究[J].煤田地质与勘探,2006,34(5):1-4.
[2]Seilacher A.Fault-graded bed interpreted as seismites[J].Sedimentoloy,1969,13(1-2):155-159.
[3]梁定益,聂泽同,万晓樵,等.试论震积岩及震积不整合-以川西、滇西地区为例[J].现代地质,1991,5(2):138-147.
[4]杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000(4):389-394.
[5]路慎强.济阳坳陷古近系碎屑岩地层中震积岩识别标志研究[J].中国石油大学学报(自然科学版),2006,30(5):8-13.
[6]翟光明.中国石油地质志(卷十六).沿海大陆架及毗邻海域油气区(上册)[M].北京:石油工业出版社,1990.
[7]漆家福,杨桥,陈发景,等.辽东湾-下辽河盆地新生代构造的运动学特征及其演化过程[J].现代地质,1994,8(1):1-9.
[8]加东辉,徐长贵,杨波,等.辽东湾地区辽东带中南部古近纪古地貌恢复、演化及其对沉积体系的控制[J].古地理学报,2007,9(2):155-165.
[9]梁定益,聂泽同,宋志敏.再论震积岩及震积不整合-以川西、滇西地区为例[J].地球科学,1994,19(6):845-850.
[10]滕玉波,周心怀,加东辉,等.辽东湾锦州31-A区块岩性圈闭成藏条件分析[J].石油地质,2007,(5):26-29.
[11]刘志斌,李绪宣,李幼铭,等.辽东湾31-6区块隐蔽油气藏的地球物理识别[J].石油地球物理勘探,2006,41(2):198-203.
[2]Seilacher A.Fault-graded bed interpreted as seismites[J].Sedimentoloy,1969,13(1-2):155-159.
[3]梁定益,聂泽同,万晓樵,等.试论震积岩及震积不整合-以川西、滇西地区为例[J].现代地质,1991,5(2):138-147.
[4]杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000(4):389-394.
[5]路慎强.济阳坳陷古近系碎屑岩地层中震积岩识别标志研究[J].中国石油大学学报(自然科学版),2006,30(5):8-13.
[6]翟光明.中国石油地质志(卷十六).沿海大陆架及毗邻海域油气区(上册)[M].北京:石油工业出版社,1990.
[7]漆家福,杨桥,陈发景,等.辽东湾-下辽河盆地新生代构造的运动学特征及其演化过程[J].现代地质,1994,8(1):1-9.
[8]加东辉,徐长贵,杨波,等.辽东湾地区辽东带中南部古近纪古地貌恢复、演化及其对沉积体系的控制[J].古地理学报,2007,9(2):155-165.
[9]梁定益,聂泽同,宋志敏.再论震积岩及震积不整合-以川西、滇西地区为例[J].地球科学,1994,19(6):845-850.
[10]滕玉波,周心怀,加东辉,等.辽东湾锦州31-A区块岩性圈闭成藏条件分析[J].石油地质,2007,(5):26-29.
[11]刘志斌,李绪宣,李幼铭,等.辽东湾31-6区块隐蔽油气藏的地球物理识别[J].石油地球物理勘探,2006,41(2):198-203.