埕海高斜坡区地层岩性油气藏勘探技术
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摘要
埕海高斜坡区构造上位于黄骅坳陷埕海断坡区南部缓坡区,勘探面积600 km2,受羊二庄—羊二庄南断层和埕宁隆起控制,古近系地层北厚南薄,向南逐渐尖灭于埕宁隆起北坡。长期发育的主干断裂和不整合面为沟通歧口凹陷的油气资源提供了优越的运移通道,同时该区古近纪时期南部物源充足,发育多个大型的辫状河三角洲沉积,储层物性良好,是形成地层岩性油气藏的有利地区。由于该区开展勘探工作较晚,基础研究仍相对薄弱,尤其是近物源、砂体多期叠置且横向变化快的难题给地层岩性油气勘探带来较大困难,也对勘探技术提出了更高的要求,笔者以埕海高斜坡区勘探实践为例,在对该区基础地质特征研究的基础上,充分运用三维可视化、地震多属性分析及井约束反演等技术和方法,结合前期钻探成果,科学合理的开展埕海高斜坡区古近系沙一段大型岩性圈闭的边界刻画与储层含油气预测等工作,有效地克服了储层识别与含油气预测中的多解性,提高了地层岩性油气藏勘探的成功率。
Chenghai high slope,which covers an exploration area of about 600 km2,is located in the southern gentle slope of Chenghai fault ramp zone of Huanghua Depression.Controlled by Yangerzhuang-South Yangerzhuang fault and Chengning uplift,Paleogene formation is thick in the north and thin in the south,with gradual piching out towards the south in the northern slope of Chengning uplift.The main fault and unconformity developed for a long time supplied the high-quality migration pathway for the hydrocarbon coming from the Qikou Sag.At the same time,several large-scale braided river deltas were developed because of the southern sufficient sources of Paleogene in the area,with high quality reservoir property,which became the favorable zone of stratigraphic-lithologic hydrocarbon reservoir generation.Because of the late exploration in the area,fundamental research is weak.Especially the problems of proximal provenance,multiple phase superposition of sand body and quick lateral change bring a great difficulty for the exploration of stratigraphic-lithologic hydrocarbon reservoir,which proposes a high demand to exploration technique.Based on the study of basic geologic characteristics and combined with the early drilling result,taking the exploration practice in Chenghai high slope as an example,this paper conducts the boundary depicting of large-scale lithologic trap and reservoir prediction for the first section of Shahejie Formation in Paleogene high slope of Chenghai through the use of 3D visualization,seismic multi-attribute analysis,constrained inversion of well.The ambiguity of the reservoir identification and hydrocarbon prediction are overcome effectively,which improves the exploration success rate of stratigraphic-lithologic reservoir.
Chenghai high slope,which covers an exploration area of about 600 km2,is located in the southern gentle slope of Chenghai fault ramp zone of Huanghua Depression.Controlled by Yangerzhuang-South Yangerzhuang fault and Chengning uplift,Paleogene formation is thick in the north and thin in the south,with gradual piching out towards the south in the northern slope of Chengning uplift.The main fault and unconformity developed for a long time supplied the high-quality migration pathway for the hydrocarbon coming from the Qikou Sag.At the same time,several large-scale braided river deltas were developed because of the southern sufficient sources of Paleogene in the area,with high quality reservoir property,which became the favorable zone of stratigraphic-lithologic hydrocarbon reservoir generation.Because of the late exploration in the area,fundamental research is weak.Especially the problems of proximal provenance,multiple phase superposition of sand body and quick lateral change bring a great difficulty for the exploration of stratigraphic-lithologic hydrocarbon reservoir,which proposes a high demand to exploration technique.Based on the study of basic geologic characteristics and combined with the early drilling result,taking the exploration practice in Chenghai high slope as an example,this paper conducts the boundary depicting of large-scale lithologic trap and reservoir prediction for the first section of Shahejie Formation in Paleogene high slope of Chenghai through the use of 3D visualization,seismic multi-attribute analysis,constrained inversion of well.The ambiguity of the reservoir identification and hydrocarbon prediction are overcome effectively,which improves the exploration success rate of stratigraphic-lithologic reservoir.
引文
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[2]翟光明.大港石油地质志[M].北京:石油工业出版社,1991:155-158.Zhai Guangming.The geological record of Dagang Oilfield[M].Beijing:Petroleum Industry Press,1991:155-158.
[3]魏嘉,丁唐杰,武港山,等.地震叠前三维可视化技术探讨[J].勘探地球物理进展,2009,32(1):12-22.Wei Jia,Ding Tangjie,Wu Gangshan,et al.On 3-D visualization ofprestack seismic data[J].Progress in Exploration Geophysics,2009,32(1):12-22.
[4]万琳.地震属性分析及其在储层预测中的应用[J].油气地球物理,2001,74(3):43-46.Wan Lin.The analysis of seismic attributes and the application in theprediction of reservoir[J].Petroleum Geophysics,2001,74(3):43-46.
[5]牛小芳,张春林,汪立蓉,等.地震反演技术在前8块储层预测中的应用[J].断块油气田,2003,10(2):8-11.Niu Xiaofang,Zhang Chunlin,Wang Lirong,et al.The application ofseismic invertrace technology in reservoir prediction of Qian8 Block[J].Fault-Block Oil&Gas Field,2003,10(2):8-11.
[6]殷八斤,曾灏.AVO技术的理论与实践[M].北京:石油工业出版社,1995:37-45.Yin Bajin,Zeng Hao.The theory and practise of AVO[M].Beijing:Petroleum Industry Press,1995:37-45
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