歧口凹陷港西凸起物源特征及控砂机制分析
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摘要
为进一步明确渤海湾盆地歧口凹陷板桥高斜坡物源特征、控砂机制及油气成藏富集规律,通过地震、测井、岩心测试化验分析资料,采用源汇分析方法对港西凸起物源轻重矿物组合特征、沟槽输砂通道与沉积微相空间分布规律进行详细论述,并进一步总结板桥高斜坡控砂机制与油气成藏富集规律。研究认为,港西凸起作为板桥高斜坡主要物源,其在沙二段和东营组高位体系域(HST)沉积时期,凸起出露面积相对较大,物源供给能力增强,在地震剖面上能够识别出数个与近岸小型扇三角洲相对应的下切侵蚀沟槽,组成相对闭合的"源-渠-汇"系统,进一步总结出港西凸起沟槽控砂模式;同时,沙二段不整合面与港东、滨海断裂系组成的油气疏导系统使得该地区具备形成地层上倾尖灭油气藏、地层超覆油气藏和地层岩性油气藏3种油气成藏条件。针对该勘探目标区,实施多口探井,获得千万吨级探明储量,证实歧口凹陷港西凸起作为内部物源能够形成有利砂体并具备油气成藏条件,为下一步勘探指明了方向。
To further clarify the provenance characteristics,sand control mechanism and hydrocarbon accumulation and enrichment regularity of Banqiao high slope in Qikou sag,Bohai Bay Basin,the source sink analysis methods are used to elaborate the provenance characteristics of light and heavy mineral assemblage,guttering sand transportation channel,spatial distribution regularities of microfacies in Gangxi uplift through seismic,well logging and core testing data.And the sand control mechanism and oil and gas reservoir accumulation and enrichment regularity of Banqiao high slope are further summarized.According to the study,Gangxi uplift,the main provenance of Banqiao high slope,its outcrop area is relatively large during the sedimentary period of the second member of Shahejie formation and Dongying formation in highstand system tract(HST),and provenance supply capacity enhanced.On the seismic section,several undercut erosion grooves corresponding to the near-shore small fan delta can be identified to form a relatively closed source-conduitsink system.The authors further summarize sand control mode of guttering in Gangxi uplift.The area has three hydrocarbon accumulation conditions:hydrocarbon reservoirs with stratigraphic updip pinchout,the stratigraphic onlap hydrocarbon reservoir and stratigraphic and lithologic hydrocarbon reservoir because of the oil and gas drainage system consisting unconformity surface of the second member of Shahejie formation and Gangdong and Binhai rift systems.A number of exploration wells are implemented in this exploration target area and ten million tons of proven reserves are obtained.It is confirmed that Gangxi uplift in Qikou sag as an internal provenance can form favorable sand bodies and has hydrocarbon accumulation conditions.The study instructs the next exploration.
To further clarify the provenance characteristics,sand control mechanism and hydrocarbon accumulation and enrichment regularity of Banqiao high slope in Qikou sag,Bohai Bay Basin,the source sink analysis methods are used to elaborate the provenance characteristics of light and heavy mineral assemblage,guttering sand transportation channel,spatial distribution regularities of microfacies in Gangxi uplift through seismic,well logging and core testing data.And the sand control mechanism and oil and gas reservoir accumulation and enrichment regularity of Banqiao high slope are further summarized.According to the study,Gangxi uplift,the main provenance of Banqiao high slope,its outcrop area is relatively large during the sedimentary period of the second member of Shahejie formation and Dongying formation in highstand system tract(HST),and provenance supply capacity enhanced.On the seismic section,several undercut erosion grooves corresponding to the near-shore small fan delta can be identified to form a relatively closed source-conduitsink system.The authors further summarize sand control mode of guttering in Gangxi uplift.The area has three hydrocarbon accumulation conditions:hydrocarbon reservoirs with stratigraphic updip pinchout,the stratigraphic onlap hydrocarbon reservoir and stratigraphic and lithologic hydrocarbon reservoir because of the oil and gas drainage system consisting unconformity surface of the second member of Shahejie formation and Gangdong and Binhai rift systems.A number of exploration wells are implemented in this exploration target area and ten million tons of proven reserves are obtained.It is confirmed that Gangxi uplift in Qikou sag as an internal provenance can form favorable sand bodies and has hydrocarbon accumulation conditions.The study instructs the next exploration.
引文
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[7]周立宏,蒲秀刚,周建生,等.黄骅坳陷歧口凹陷古近系坡折体系聚砂控藏机制分析[J].石油实验地质,2011,33(4):371-377.ZHOU Lihong,PU Xiugang,ZHOU Jiansheng,et al.Sand-gathering and reservoir-controlling mechanisms of Paleogene slope-break system in Qikou Sag of Huanghua Depression,Bohai Bay Basin[J].Petroleum Geology and Experiment,2011,33(4):371-377.
[8]吴林钢,朱筱敏,范乐元,等.黄骅坳陷北大港构造带沙河街组沉积体系定量研究[J].古地理学报,2008,10(3):241-250.WU Lingang,ZHU Xiaomin,FAN Leyuan,et al.Quantitative studies on depositional systems of Shahejie formation in north Dagang structure zone,Huanghua depression[J].Journal of Palaeogeography,2008,10(3):241-250.
[9]赵贤正,蒲秀刚,周立宏,等.渤海湾盆地歧口凹陷古近系沉积体系重建与储集层评价[J].成都理工大学学报(自然科学版),2017,44(5):565-578.ZHAO Xianzheng,PU Xiugang,ZHOU Lihong,et al.Reconstruction and reservoir evaluation of Paleogene sedimentary system in Qikou Sag of Bohai Bay Basin[J].Journal of Chengdu University of Technology(Science&Technology Edition),2017,44(5):565-578.
[10]陶晓风,刘登忠,朱利东.陆相盆地沉积作用与构造作用的关系[J].沉积学报,2001,19(3):410-414.TAO Xiaofeng,LIU Dengzhong,ZHU Lidong.Relationship between sedimentary process in terrestrial basin and tectonic process[J].Acta Sedimentologica Sinica,2001,19(3):410-414.
[11]林畅松,刘景彦,胡博.构造活动盆地沉积层序形成过程模拟:以断陷和前陆盆地为例[J].沉积学报,2010,28(5):868-874.LIN Changsong,LIU Jingyan,HU Bo.Computer simulation on the formation of depositional sequences in tectonic active basin:case study on rift and foreland basins[J].Acta Sedimentologica Sinica,2010,28(5):868-874.
[12]吴孔友,秦磊,谭明友,等.构造对东营凹陷深层砂体发育的控制作用[J].沉积学报,2014,32(5):893-900WU Kongyou,QIN Lei,TAN Mingyou,et al.Research on structures controlling the development of deep sand bodies in Dongying Sag[J].Acta Sedimentologica Sinica,2014,32(5):893-900.
[13]赵贤正,周立宏,肖敦清,等.歧口凹陷斜坡区油气成藏与勘探实践[J].石油学报,2016,37(增刊2):1-9.ZHAO Xianzheng,ZHOU Lihong,XIAO Dunqing,et al.Hydrocarbon accumulation and exploration practice of slope area in Qikou sag[J].Acta Petrolei Sinica,2016,37(s2):1-9.
[2]徐长贵,赖维成,薛永安,等.古地貌分析在渤海古近系储集层预测中的应用[J].石油勘探与开发,2004,31(5):53-56.XU Changgui,LAI Weicheng,XUE Yong'an,et al.Palaeo-geomorphology analysis for the Paleogene reservoir prediction in Bohai sea area[J].Petroleum Exploration and Development,2004,31(5):53-56.
[3]周立宏,肖敦清,蒲秀刚,等.陆相断陷湖盆复式叠合油气成藏与优势相富集新模式:以渤海湾盆地歧口凹陷为例[J].岩性油气藏,2010,22(1):7-10.ZHOU Lihong,XIAO Dunqing,PU Xiugang,et al.New pattern of composite superimposed reservoirs and advantageous phase accumulation in continental rifted lake basin:a case study from Qikou Sag of Bohai Bay Basin[J].Lithologic Reservoirs,2010,22(1):7-10.
[4]蒲秀刚,吴永平,周建生,等.歧口凹陷岩性地层油气藏特征及勘探潜力[J].石油学报,2007,28(2):35-39.PU Xiugang,WU Yongping,ZHOU Jiansheng,et al.Characteristics and exploration potential of lithologicstratigraphic hydrocarbon reservoirs in Qikou Sag of Dagang Oilfield[J].Acta Petrolei Sinica,2007,28(2):35-39.
[5]蒲秀刚,柳飒,周建生,等.“三元耦合”控藏机制与勘探有利区分析:以渤海湾盆地歧口凹陷古近系岩性地层油气藏为例[J].石油实验地质,2008,30(6):575-579.PU Xiugang,LIU Sa,ZHOU Jiansheng,et al.Mechanism of ternary factors coupling for controlling reservoir and analysis of beneficial exploration areas:an example of the eogene stratigraphic reservoir of Qikou Sag in Huanghua Depression of the Bohai Bay Basin[J].Petroleum Geology and Experiment,2008,30(6):575-579.
[6]蒲秀刚,陈长伟,柳飒,等.歧口凹陷歧北斜坡沙三段挠曲坡折体系与岩性油气藏勘探[J].成都理工大学学报(自然科学版),2011,38(6):611-618.PU Xiugang,CHEN Changwei,LIU Sa,et al.The flexure slope break systems and lithologic reservoir exploration of the third member of Shahejie formation in Qibei slope of Qikou Sag[J].Journal of Chengdu University of Technology(Science&Technology Edition),2011,38(6):611-618.
[7]周立宏,蒲秀刚,周建生,等.黄骅坳陷歧口凹陷古近系坡折体系聚砂控藏机制分析[J].石油实验地质,2011,33(4):371-377.ZHOU Lihong,PU Xiugang,ZHOU Jiansheng,et al.Sand-gathering and reservoir-controlling mechanisms of Paleogene slope-break system in Qikou Sag of Huanghua Depression,Bohai Bay Basin[J].Petroleum Geology and Experiment,2011,33(4):371-377.
[8]吴林钢,朱筱敏,范乐元,等.黄骅坳陷北大港构造带沙河街组沉积体系定量研究[J].古地理学报,2008,10(3):241-250.WU Lingang,ZHU Xiaomin,FAN Leyuan,et al.Quantitative studies on depositional systems of Shahejie formation in north Dagang structure zone,Huanghua depression[J].Journal of Palaeogeography,2008,10(3):241-250.
[9]赵贤正,蒲秀刚,周立宏,等.渤海湾盆地歧口凹陷古近系沉积体系重建与储集层评价[J].成都理工大学学报(自然科学版),2017,44(5):565-578.ZHAO Xianzheng,PU Xiugang,ZHOU Lihong,et al.Reconstruction and reservoir evaluation of Paleogene sedimentary system in Qikou Sag of Bohai Bay Basin[J].Journal of Chengdu University of Technology(Science&Technology Edition),2017,44(5):565-578.
[10]陶晓风,刘登忠,朱利东.陆相盆地沉积作用与构造作用的关系[J].沉积学报,2001,19(3):410-414.TAO Xiaofeng,LIU Dengzhong,ZHU Lidong.Relationship between sedimentary process in terrestrial basin and tectonic process[J].Acta Sedimentologica Sinica,2001,19(3):410-414.
[11]林畅松,刘景彦,胡博.构造活动盆地沉积层序形成过程模拟:以断陷和前陆盆地为例[J].沉积学报,2010,28(5):868-874.LIN Changsong,LIU Jingyan,HU Bo.Computer simulation on the formation of depositional sequences in tectonic active basin:case study on rift and foreland basins[J].Acta Sedimentologica Sinica,2010,28(5):868-874.
[12]吴孔友,秦磊,谭明友,等.构造对东营凹陷深层砂体发育的控制作用[J].沉积学报,2014,32(5):893-900WU Kongyou,QIN Lei,TAN Mingyou,et al.Research on structures controlling the development of deep sand bodies in Dongying Sag[J].Acta Sedimentologica Sinica,2014,32(5):893-900.
[13]赵贤正,周立宏,肖敦清,等.歧口凹陷斜坡区油气成藏与勘探实践[J].石油学报,2016,37(增刊2):1-9.ZHAO Xianzheng,ZHOU Lihong,XIAO Dunqing,et al.Hydrocarbon accumulation and exploration practice of slope area in Qikou sag[J].Acta Petrolei Sinica,2016,37(s2):1-9.
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