莱州湾凹陷南斜坡原油地球化学特征及差异分布成因
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摘要
根据原油宏观地球化学特点,结合原油沉积环境及成熟度特征划分原油成因类型,分析莱州湾凹陷超压及其与油气成藏关系,明确南斜坡油气差异成藏规律。结果表明:莱州湾凹陷南斜坡原油可划分为3种成因类型,分别为沙三淡水型、沙四咸化型和混源型;原油分布明显受沙三中—下亚段下部"超压系统"控制,在超压系统作用下,沙三段烃源岩生成的油气以垂向及侧向运移为主;在上覆超压系统围限作用下,沙四段烃源岩生成的油气多发生侧向运移,斜坡内带原油类型为沙三淡水型;斜坡外带原油类型表现为沙四咸化型和混源型。该结果为研究区下一步油气勘探提供指导。
The nature of crude oil in the south slope of Laizhouwan Sag is very different,and the law of petroleum accumulation is not clear,so it is difficult to meet the needs of fine exploration.Combined with the macroscopic geochemical characteristics of crude oil,the genetic types of crude oil are classified according to the sedimentary environment and maturity characteristics of crude oil.At the same time,the overpressure in Laizhouwan Sag and its relationship with petroleum accumulation are analyzed.The oil and gas reservoir formation law of south slope is clear.The results show that the crude oil in the south slope of Laizhouwan Sag can be divided into three genetic types,namely,the fresh water oil,the salinized oil and the mixed source crude oil.The distribution of crude oil is obviously controlled by the "overpressure system" in the lower part of the middle and lower submember of Shahejie Formation.Under the action of the overpressure system,the source rocks of the third member of the formation mainly migrate vertically and laterally.The hydrocarbon source rocks of the fourth member of the Shahejie Formation often migrate laterally under the overpressure system.The oil types in the inner slope of the slope are the type of " Sha San fresh water",while the types of the oil in the outer zone of the slope are mostly mixed source type.The understanding of differential reservoir forming geology in the south slope of Laizhouwan Sag has certain guiding significance for oil and gas exploration in this area.
The nature of crude oil in the south slope of Laizhouwan Sag is very different,and the law of petroleum accumulation is not clear,so it is difficult to meet the needs of fine exploration.Combined with the macroscopic geochemical characteristics of crude oil,the genetic types of crude oil are classified according to the sedimentary environment and maturity characteristics of crude oil.At the same time,the overpressure in Laizhouwan Sag and its relationship with petroleum accumulation are analyzed.The oil and gas reservoir formation law of south slope is clear.The results show that the crude oil in the south slope of Laizhouwan Sag can be divided into three genetic types,namely,the fresh water oil,the salinized oil and the mixed source crude oil.The distribution of crude oil is obviously controlled by the "overpressure system" in the lower part of the middle and lower submember of Shahejie Formation.Under the action of the overpressure system,the source rocks of the third member of the formation mainly migrate vertically and laterally.The hydrocarbon source rocks of the fourth member of the Shahejie Formation often migrate laterally under the overpressure system.The oil types in the inner slope of the slope are the type of " Sha San fresh water",while the types of the oil in the outer zone of the slope are mostly mixed source type.The understanding of differential reservoir forming geology in the south slope of Laizhouwan Sag has certain guiding significance for oil and gas exploration in this area.
引文
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[14]吴俊刚,王昕,柴永波,等.隐性走滑断裂识别标志及其与油气聚集的关系:以青东—莱州湾构造带为例[J].东北石油大学学报,2017,41(3):1-8.WU Jungang,WANG Xin,CHAI Yongbo,et al.Identification marks of subtle strike-slip faults and its relationship with hydrocarbon accumulation in Qingdong-Laizhouwan Tectonic Belt[J].Journal of Northeast Petroleum University,2017,41(3):1-8.
[15]朱文森,刘士磊,王立红,等.渤海始新统沙四段层序地层特征及与周边油区的对比[J].地层学杂志,2010,34(2):154-160.ZHUWensen,LIUShilei,WANGLihong,etal.Thecharacteristicsofthemember4ofShahejieFormation in Bohai Basin and its correlation with neighbouring oilfields[J].Journal of Stratigraphy,2010,34(2):154-160.
[16]王军,郭永华,李建平,等.根据原油成熟度参数确定排烃门限的新方法[J].中国海上油气,2012,24(4):20-24.WANG Jun,GUO Yonghua,LI Jianping,et al.A new method to determine hydrocarbon-expulsion threshold by an oil maturity parameter[J].China Offshore Oil and Gas,2012,24(4):20-24.
[17]张明星,郭耿生,张琳璞.济阳坳陷青东凹陷古近系沙河街组烃源岩地球化学特征及生烃潜力综合评价[J].东北石油大学学报,2017,41(3):34-43.ZHANG Mingxing,GUO Gengsheng,ZHANG Linpu.Comprehensive evaluation of geochemical characteristic and hydrocarbon generation potential of source rocks of Paleogene Shahejie Formation in Qingdong Sag,Jiyang Depression[J].Journal of Northeast Petroleum University,2017,41(3):34-43.
[18]朱光有,金强,戴金星,等.东营凹陷油气成藏期次及其分布规律研究[J].石油与天然气地质,2004,25(2):209-215.ZHU Guangyou,JIN Qiang,DAI Jinxing,et al.A study on periods of hydrocarbon accumulation and distribution pattern of oil and gas pools in Dongying Depression[J].Oil&Gas Geology,2004,25(2):209-215.
[19]Price P L,O'Sullivan T,Alexander R.The nature and occurrence of oil in Seram,Indonesia[M]∥Indonesian Petroleum Association Proceedings of the Indonesian Petroleum Association Sixteen Annual Convention Jakarta Indonesian Petroleum Association.Jakarta Indonesia:Indonesian Petroleum Association,1987:141-173.
[20]朱扬明,张春明,张敏,等.沉积环境的氧化还原性对重排甾烷形成的作用[J].沉积学报,1997,15(4):103-108.ZHU Yangming,ZHANG Chunming,ZHANG Ming,et al.The effect of oxidation reduction nature of depositional environments on the formation of diasteranes[J].Acta Sedimentologica Sinica,1997,15(4):103-108.
[21]徐源,庞雄奇,胡涛,等.利用泥岩声波时差预测地层压力方法优选[J].特种油气藏,2018,25(4):46-50.XU Yuan,PANG Xiongqi,HU Tao,et al.Selection of formation pressure prediction methods based on mudstone interval transit time[J].Special Oil&Gas Reservoirs,2018,25(4):46-50.
[22]郝芳,金之钧,邹华耀,等.超压盆地生烃作用动力学与油气成藏机理[M].北京:科学出版社,2004:197-207.HAO Fang,JIN Zhijun,ZOU Huayao,et al.Kinetics of hydrocarbon generation and mechanisms of petroleum accumulation in overpressured basins[M].Beijing:Science Press,2004:197-207.
[23]刘华,蒋有录,卢浩,等.渤南洼陷流体包裹体特征与成藏期流体压力恢复[J].地球科学,2016,41(8):1384-1394.LIU Hua,JIANG Youlu,LU Hao,et al.Restoration of fluid pressure during hydrocarbon accumulation period and fluid inclusion feature in the Bonan Sag[J].Earth Science,2016,41(8):1384-1394.
[2]张爽,叶加仁,刘文超.莱州湾凹陷断裂控藏机理[J].新疆石油地质,2013,34(2):179-182.ZHANG Shuang,YE Jiaren,LIU Wenchao.Mechanism of controlling of fault on oil accumulation in Laizhouwan Sag in southern Bohai Bay Basin[J].Xinjiang Petroleum Geology,2013,34(2):179-182.
[3]王孝辕,黄江波,杨海风,等.莱北低凸起构造成因演化及其对沉积体系的控制作用[J].东北石油大学学报,2018,42(2):1-10.WANG Xiaoyuan,HUANG Jiangbo,YANG Haifeng,et al.Tectonic origin and evolution of Laibei Low Uplift and its control over sedimentary system[J].Journal of Northeast Petroleum University,2018,42(2):1-10.
[4]辛云路,任建业,李建平.构造—古地貌对沉积的控制作用:以渤海南部莱州湾凹陷沙三段为例[J].石油勘探与开发,2013,40(3):302-308.XIN Yunlu,REN Jianye,LI Jianping.Control of tectonic-paleogeomorphology on deposition:a case from the Shahejie Formation Sha3member,Laizhouwan Sag,southern Bohai Sea[J].Petroleum Exploration and Development,2013,40(3):302-308.
[5]王德英,于海波,王启明,等.渤海海域湖盆萎缩期浅水三角洲岩性油气藏差异成藏模式[J].东北石油大学学报,2018,42(3):16-25.WANG Deying,YU Haibo,WANG Qiming,et al.Differences of hydrocarbon accumulation models of extremely shallow water delta in lacustrine basin shrinking period,Bohai Sea[J].Journal of Northeast Petroleum University,2018,42(3):16-25.
[6]王鑫,蒋有录,王永诗,等.济阳坳陷生烃洼陷沉降类型及其油气地质意义[J].特种油气藏,2017,24(2):24-29.WANG Xin,JIANG Youlu,WANG Yongshi,et al.Settlement types of hydrocarbon-generating sag in the Jiyang Depression and their geologic significance for hydrocarbon accumulations[J].Special Oil&Gas Reservoirs,2017,24(2):24-29.
[7]姜丽娜.莱州湾凹陷烃源岩生烃历史模拟[J].科技导报,2011,29(13):52-56.JIANG Lina.Simulation of hydrocarbon generation history of source rocks in Laizhouwan Sag[J].Science&Technology Review,2011,29(13):52-56.
[8]胡志伟,黄志.渤海海域庙西中南洼勘探潜力分析[J].特种油气藏,2017,24(2):69-74.HU Zhiwei,HUANG Zhi.Exploration potentials of Miaoxizhongnan Sag in Bohai Sea[J].Special Oil&Gas Reservoirs,2017,24(2):69-74.
[9]孙和风,周心怀,彭文绪.莱州湾凹陷油气成藏动力学特征[J].西安石油大学学报(自然科学版),2009,24(4):27-35.SUN Hefeng,ZHOU Xinhuai,PENG Wenxu.Dynamic characteristics of the hydrocarbon accumulation in Laizhouwan Sag[J].Journal of Xi'an Shiyou University(Natural Science Edition Science),2009,24(4):27-35.
[10]王亮,周心怀,牛成民,等.渤海海域莱州湾凹陷构造演化对油气成藏的控制作用[J].地质科学,2011,46(3):838-846.WANG Liang,ZHOU Xinhuai,NIU Chengmin,et al.The effect of structure evolution on hydrocarbon accumulation in Laizhouwan Depression,Bohai Bay[J].Chinese Journal of Geology,2011,46(3):838-846.
[11]杨波,胡志伟,李果营,等.渤海莱州湾凹陷南部斜坡带构造特征及油气成藏规律[J].中国海上油气,2016,28(5):22-29.YANG Bo,HU Zhiwei,LI Guoying,et al.Tectonic characteristics and hydrocarbon accumulation rules in south slope of Laizhouwan Sag in Bohai Sea[J].China Offshore Oil and Gas,2016,28(5):22-29.
[12]彭文绪,辛仁臣,孙和风,等.渤海海域莱州湾凹陷的形成和演化[J].石油学报,2009,30(5):654-660.PENG Wenxu,XIN Renchen,SUN Hefeng,et al.Formation and evolution of Laizhouwan Bay Sag in Bohai Bay[J].Acta Petrolei Sinica,2009,30(5):654-660.
[13]黄雷,王应斌,武强,等.渤海湾盆地莱州湾凹陷新生代盆地演化[J].地质学报,2012,86(6):867-876.HUANG Lei,WANG Yingbin,WU Qiang,et al.Cenozoic tectonic evolution of the Laizhouwan Sag in Bohai Bay Basin[J].Acta Geologica Sinica,2012,86(6):867-876.
[14]吴俊刚,王昕,柴永波,等.隐性走滑断裂识别标志及其与油气聚集的关系:以青东—莱州湾构造带为例[J].东北石油大学学报,2017,41(3):1-8.WU Jungang,WANG Xin,CHAI Yongbo,et al.Identification marks of subtle strike-slip faults and its relationship with hydrocarbon accumulation in Qingdong-Laizhouwan Tectonic Belt[J].Journal of Northeast Petroleum University,2017,41(3):1-8.
[15]朱文森,刘士磊,王立红,等.渤海始新统沙四段层序地层特征及与周边油区的对比[J].地层学杂志,2010,34(2):154-160.ZHUWensen,LIUShilei,WANGLihong,etal.Thecharacteristicsofthemember4ofShahejieFormation in Bohai Basin and its correlation with neighbouring oilfields[J].Journal of Stratigraphy,2010,34(2):154-160.
[16]王军,郭永华,李建平,等.根据原油成熟度参数确定排烃门限的新方法[J].中国海上油气,2012,24(4):20-24.WANG Jun,GUO Yonghua,LI Jianping,et al.A new method to determine hydrocarbon-expulsion threshold by an oil maturity parameter[J].China Offshore Oil and Gas,2012,24(4):20-24.
[17]张明星,郭耿生,张琳璞.济阳坳陷青东凹陷古近系沙河街组烃源岩地球化学特征及生烃潜力综合评价[J].东北石油大学学报,2017,41(3):34-43.ZHANG Mingxing,GUO Gengsheng,ZHANG Linpu.Comprehensive evaluation of geochemical characteristic and hydrocarbon generation potential of source rocks of Paleogene Shahejie Formation in Qingdong Sag,Jiyang Depression[J].Journal of Northeast Petroleum University,2017,41(3):34-43.
[18]朱光有,金强,戴金星,等.东营凹陷油气成藏期次及其分布规律研究[J].石油与天然气地质,2004,25(2):209-215.ZHU Guangyou,JIN Qiang,DAI Jinxing,et al.A study on periods of hydrocarbon accumulation and distribution pattern of oil and gas pools in Dongying Depression[J].Oil&Gas Geology,2004,25(2):209-215.
[19]Price P L,O'Sullivan T,Alexander R.The nature and occurrence of oil in Seram,Indonesia[M]∥Indonesian Petroleum Association Proceedings of the Indonesian Petroleum Association Sixteen Annual Convention Jakarta Indonesian Petroleum Association.Jakarta Indonesia:Indonesian Petroleum Association,1987:141-173.
[20]朱扬明,张春明,张敏,等.沉积环境的氧化还原性对重排甾烷形成的作用[J].沉积学报,1997,15(4):103-108.ZHU Yangming,ZHANG Chunming,ZHANG Ming,et al.The effect of oxidation reduction nature of depositional environments on the formation of diasteranes[J].Acta Sedimentologica Sinica,1997,15(4):103-108.
[21]徐源,庞雄奇,胡涛,等.利用泥岩声波时差预测地层压力方法优选[J].特种油气藏,2018,25(4):46-50.XU Yuan,PANG Xiongqi,HU Tao,et al.Selection of formation pressure prediction methods based on mudstone interval transit time[J].Special Oil&Gas Reservoirs,2018,25(4):46-50.
[22]郝芳,金之钧,邹华耀,等.超压盆地生烃作用动力学与油气成藏机理[M].北京:科学出版社,2004:197-207.HAO Fang,JIN Zhijun,ZOU Huayao,et al.Kinetics of hydrocarbon generation and mechanisms of petroleum accumulation in overpressured basins[M].Beijing:Science Press,2004:197-207.
[23]刘华,蒋有录,卢浩,等.渤南洼陷流体包裹体特征与成藏期流体压力恢复[J].地球科学,2016,41(8):1384-1394.LIU Hua,JIANG Youlu,LU Hao,et al.Restoration of fluid pressure during hydrocarbon accumulation period and fluid inclusion feature in the Bonan Sag[J].Earth Science,2016,41(8):1384-1394.