歧南洼陷西斜坡滩坝砂隐蔽油气藏研究与评价

doi:10.11743/ogg20040417

摘要/Abstract

摘要：

通过岩心、测井、地震资料的综合研究及其层序界面的划分,歧南洼陷西斜坡,发育沙河街组滩坝砂、近岸水下扇及重力流水道等多种类型砂体。沙河街组底超、顶剥、中间相变明显,易形成多个层系、多种类型非构造圈闭。歧口凹陷西斜坡为继承性发育构造斜坡,是歧口凹陷油气运移的主要指向区,供油条件优越。广泛分布其间的的沙河街组三段滩、坝砂体平均孔隙度24.8%。平均渗透率175.5×10^-3μm²,具有高孔高渗特征。而且,滩、坝砂体沉积后没有遭受大规模构造运动破坏,油气保存条件有利。多年来的勘探成果,区内发现以歧647井油藏为代表的不整合油藏、以联盟为代表的上翘尖灭型油藏,以歧南9-1井为代表的构造-岩性油气藏等多种类型的油气藏,具备形成一定规模隐蔽油气藏的成藏条件。根据岩心相、测井相和地震相研究,预测歧南西斜坡沙三段低水位水下扇砂体及歧北斜坡的坡折带是下一步勘探的有利地区。其中,扣50南岩性圈闭及庄43井断块是最有利地区。

关键词: 隐蔽油气藏, 斜坡勘探, 滩坝, 层序地层学, 歧南洼陷

Abstract:

Comprehensive study of core, logging and seismic data, and classification of stratigraphic sequence interfaces show that various types of sandbodies, including beach and bar sands, coastal subaqueous fan and gravitational flow channel sands in Shahejie Formation, are developed on the western slope of Qinan sag. Basal overlapping, top denudation, and facies variation between them are evident in Shahejie Formation, thus multiple layer systems and various types of non-structural traps can be formed.The western slope in Qikou depression,an inherent structural slope,is the main directional area of hydrocarbon migration in the depression, and has excellent hydrocarbon supplying conditions. The beach and bar sandbodies in the 3 member of Shahejie Formation are widely distributed, and have an average porosity of 24.8% and average permeability of 175.5×10^-3μm²,thus belong to high porosity and high permeability reservoirs.Moreover, these sandbodies have never been disrupted by large tectonic movement since their sedimentation, thus the area would have favorable hydrocarbon preservation conditions. Various types of reservoirs have been discovered during previous exploration, including unconformity reservoirs, upwarping pinch-out reservoirs, and structural-lithologic reservoirs represented by Qi674 well reservoir, Lianmeng reservoir and Qinan 9-1 well reservoir, respectively, indicating that the area possesses the condition of forming certain size subtle reservoirs. According to the study of core, log and seismic facies, it is predicted that the low stand subaqueous fan sandbodies in the 3^rd member of Shahejie Formation on the western slope of Qinan sag and the slope break zone of the slope in Qibei sag would be the favorable areas in the later exploration; among which, the lithologic traps to the south of Kou 50 well and Zhuang 43 well fault block would firstly be selected as the exploration targets.

Key words: subtle oil/gas reservoir, slope exploration, beach and bar, sequence stratigraphy, Qinan sag

中图分类号:

TE112.322

毛宁波,范哲清,李玉海,等. 歧南洼陷西斜坡滩坝砂隐蔽油气藏研究与评价[J]. 石油与天然气地质, 2004, 25(4): 455-461. doi: 10.11743/ogg20040417 Mao Ningbo,Fan Zheqing,Li Yuhai,et al. A study of beach and bar sands subtle reservoirs in western slope of Qinan sag[J]. Oil & Gas Geology, 2004, 25(4): 455-461. doi: 10.11743/ogg20040417

参考文献

[1] 袁选俊,谯汉生.渤海湾盆地富油气凹陷隐蔽油气藏勘探[J]. 石油与天然气地质,2002, 23(2):130～133
[2] 朱筱敏,信荃麟,张晋仁.断陷湖盆滩坝储集体沉积特征及沉积模式[J].沉积学报,1994,12(2):20～27
[3] 陈世悦,杨剑萍,操应长.惠民凹陷西部下第三系沙河街组两种滩坝沉积特征[J].煤田地质与勘探,2000,28(3):1～4
[4] 吴崇筠.湖盆砂体类型[J].沉积学报,1986,4(4):1～27
[5] 周丽清,邵德艳,房世瑜,等.板桥凹陷沙河街组滩坝砂体[J].石油与天然气地质,1998,19(4):351～355
[6] 孙锡年,刘渝,满燕.东营凹陷西部沙四段滩坝砂岩油气成藏条件[J].国外油田工程,2003,19(7):24～25
[7] Soreghan M J,Andrews C. Textural and compositional variability across littiral segments of Lake Tanganyika:the effect of asymmetric basin structure on sedimentation in large rift lakes [J].AAPG Bull,1996,80(3):382～409
[8] 李绍光,吴涛.中国石油地质志, 卷4,大港油田[M]. 北京:石油工业出版社,1991
[9] 孟元林,周玥,付静茹.歧南凹陷下第三系成岩阶段划分[J].地学前缘,2004,11(1):10
[10] van Wagoner J C,Posamentier H W,Mitchum R M,et al. An overview of the fun damentials of sequence stratigraphy and key definitions[A].In:Wilgus C K,Hastings B S,Kendall C G St C,et al.Sea-level changes:an integrated approach[C].SEP M Spec Pub,1988,42:39～45
[11] 陈开远,孙爱霞,杜宁平.成油体系中的层序地层学[J]. 石油与天然气地质,1998,19(3):221～225
[12] 薛良清.湖相盆地中的层序、体系域与隐蔽油气藏[J].石油与天然气地质,2002,23( 2):115～120
[13] 蒲仁海.断陷湖盆层序地层学的几点进展[J]. 石油与天然气地质,2002,23(4):410～413
[14] 许淑梅,翟世奎,李三忠,等.歧口凹陷滩海区下第三系地震反射特征及层序划分[J].青岛海洋大学学报,2001,31(5):739～746
[15] 赵澄林,张善文,袁静,等.胜利油区沉积储层与油气[M].北京:石油工业出版社,1999
[16] 陈昭年,陈发景,周建生,等.黄骅坳陷中北区和歧口凹陷断裂构造特征及古应力分析 [J].现代地质,1997,11(4):471～477
[17] 刘伟兴,谭守强,袁淑琴,等.歧口凹陷中浅层油气富集因素及成藏模式[J].中国海上油气(地质),2002,16(3):183～188
[18] 王光奇,漆家福,岳云福.歧口凹陷及周缘新生代构造的成因和演化[J]. 地质科学, 2003,38(2):230～240
[19] 吴元燕,付建生,周建生,等.歧口凹陷含油气系统及其评价[J].石油学报,2000,21(6):18～22