沧东凹陷孔二段常非一体化成藏研究与实践
|
摘要
沧东凹陷是大港探区第二大富油凹陷,总面积为4 700 km~2,其中孔二段有效勘探面积1 500 km~2,最大埋深5 000 m。其勘探主要经历了以构造理念为主的构造油气藏发现阶段和以岩性理念为主的岩性油气藏发现阶段,对于非常规油气藏的认识仅以单井出油气点的形式存在,没有进行深入的研究。近几年,以孔南1 760 km~2三维地震数据体为依托,开展全凹陷构造、沉积储集层、烃源岩与成藏模式等的重建研究,揭示了孔二段独特的地质特征与成藏规律。通过对常规油气藏和非常规油气藏开展一体化成藏条件分析,建立了孔二段在有效烃源岩控制下形成常规油与页岩油有序分布、连片聚集,满凹含油的油藏模式,即:斜坡主砂体区形成岩性油藏,细粒沉积区源储互层形成页岩油藏,为下步勘探潜力区带优选提供了依据。
Cangdong sag is the second largest oil-rich sag in Dagang exploration area with a total area of 4700 km~2.The effective exploration area of member 2 of Kongdian formation is 1500 km~2,and the maximum buried depth is 5000 m.The exploration has mainly experienced the discovery stage of structural hydrocarbon reservoirs based on structural concept and the discovery stage of lithologic oil and gas reservoirs based on lithology concept.The understanding of unconventional oil and gas reservoirs exists only in the form of single well oil and gas production points,and no in-depth research has been conducted.In recent years,based on the 1 760 km~2 seismic data volume of Kongnan,the rebuild studies of the whole sag structure,sedimentary reservoir,source rock and hydrocarbon accumulation pattern have been carried out,revealing the unique geologic characteristics and accumulation law of member 2 of Kongdian formation.With the analysis of the integrated hydrocarbon accumulation conditions of conventional oil and gas reservoirs and unconventional oil and gas reservoirs,a reservoir model of conventional oil and shale oil orderly distribution and continuous accumulation,and oil bearing in whole sag under the control of effective source rocks in member 2 of Kongdian formation was established.It means that the lithologic oil reservoirs are formed in the main sand body area of the slope,and the shale oil reservoirs are formed in the source-storage interbeds of the fine-grained sedimentary area,which provides a basis for the further exploration potential zone optimization.
Cangdong sag is the second largest oil-rich sag in Dagang exploration area with a total area of 4700 km~2.The effective exploration area of member 2 of Kongdian formation is 1500 km~2,and the maximum buried depth is 5000 m.The exploration has mainly experienced the discovery stage of structural hydrocarbon reservoirs based on structural concept and the discovery stage of lithologic oil and gas reservoirs based on lithology concept.The understanding of unconventional oil and gas reservoirs exists only in the form of single well oil and gas production points,and no in-depth research has been conducted.In recent years,based on the 1 760 km~2 seismic data volume of Kongnan,the rebuild studies of the whole sag structure,sedimentary reservoir,source rock and hydrocarbon accumulation pattern have been carried out,revealing the unique geologic characteristics and accumulation law of member 2 of Kongdian formation.With the analysis of the integrated hydrocarbon accumulation conditions of conventional oil and gas reservoirs and unconventional oil and gas reservoirs,a reservoir model of conventional oil and shale oil orderly distribution and continuous accumulation,and oil bearing in whole sag under the control of effective source rocks in member 2 of Kongdian formation was established.It means that the lithologic oil reservoirs are formed in the main sand body area of the slope,and the shale oil reservoirs are formed in the source-storage interbeds of the fine-grained sedimentary area,which provides a basis for the further exploration potential zone optimization.
引文
[1] Daniel A,Brain B,Bobbi JC,et al.Evaluation implication of hydraulic fracturing in shale gas reservoirs[C].SPE Americas E&P Environment and Satety Conference:San Antion,Texas,2009.
[2] 庞正炼,邹才能,陶士振,等.中国致密油形成分布与资源潜力评价[J].中国工程科学,2012,14(7):60-67.PANG Zhenglian,ZOU Caineng,TAO Shizhen,et al.Formation,distribution and resourc evaluation of tight oil in China [J].China Engineering Sciences,2012,14 (7):60-67.
[3] 蒲秀刚,周立宏,韩文中,等.细粒相沉积地质特征与致密油勘探:以渤海湾盆地沧东凹陷孔店组二段为例[J].石油勘探与开发,2016,43(1):24-33.PU Xiugang,ZHOU Lihong,HAN Wenzhong,et al.Geologic features of fine-grained facies sedimentation and tight oil exploration:A case from the second Member of Paleogene Kongdian Formation of Cangdong sag,Bohai Bay Basin[J].Petroleum Exploration and Development,2016,43(1):24-33.
[4] 官全胜.沧东凹陷孔二段控藏机制研究与勘探成效[J].非常规油气,2017,4(4):41-46.GUAN Quansheng.Study on the mechanism of reservoir control in the second member of Kongdian formation in Cangdong Sag and its exploration effect[J].Unconventional Oil & Gas,2017,4(4):41-46.
[5] 赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):393-406.ZHAO Jingzhou.Conception,classification and resource potential unconventional hydrocarbons[J].Natural Gas Geo Science,2012,23(3):393-406.
[6] 赵贤正,蒲秀刚,韩文中,等.细粒沉积岩性识别新方法与储集层甜点分析:以渤海湾盆地沧东凹陷孔店组二段为例[J].石油勘探与开发,2017,44(4):492-502.ZHAO Xianzheng,PU Xiugang,HAN Wenzhong,et al.A new method for lithology identification of fine grained deposits and reservoir sweet spot analysis:A case study of Kong 2 Member in Cangdong sag,Bohai Bay Basin,China[J].Petroleum Exploration and Development,2017,44(4):492-502.
[2] 庞正炼,邹才能,陶士振,等.中国致密油形成分布与资源潜力评价[J].中国工程科学,2012,14(7):60-67.PANG Zhenglian,ZOU Caineng,TAO Shizhen,et al.Formation,distribution and resourc evaluation of tight oil in China [J].China Engineering Sciences,2012,14 (7):60-67.
[3] 蒲秀刚,周立宏,韩文中,等.细粒相沉积地质特征与致密油勘探:以渤海湾盆地沧东凹陷孔店组二段为例[J].石油勘探与开发,2016,43(1):24-33.PU Xiugang,ZHOU Lihong,HAN Wenzhong,et al.Geologic features of fine-grained facies sedimentation and tight oil exploration:A case from the second Member of Paleogene Kongdian Formation of Cangdong sag,Bohai Bay Basin[J].Petroleum Exploration and Development,2016,43(1):24-33.
[4] 官全胜.沧东凹陷孔二段控藏机制研究与勘探成效[J].非常规油气,2017,4(4):41-46.GUAN Quansheng.Study on the mechanism of reservoir control in the second member of Kongdian formation in Cangdong Sag and its exploration effect[J].Unconventional Oil & Gas,2017,4(4):41-46.
[5] 赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):393-406.ZHAO Jingzhou.Conception,classification and resource potential unconventional hydrocarbons[J].Natural Gas Geo Science,2012,23(3):393-406.
[6] 赵贤正,蒲秀刚,韩文中,等.细粒沉积岩性识别新方法与储集层甜点分析:以渤海湾盆地沧东凹陷孔店组二段为例[J].石油勘探与开发,2017,44(4):492-502.ZHAO Xianzheng,PU Xiugang,HAN Wenzhong,et al.A new method for lithology identification of fine grained deposits and reservoir sweet spot analysis:A case study of Kong 2 Member in Cangdong sag,Bohai Bay Basin,China[J].Petroleum Exploration and Development,2017,44(4):492-502.