琼东南盆地浅水区与深水区烃源岩热演化差异性影响因素研究
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摘要
为找出琼东南盆地浅水区与深水区烃源岩有机质热演化差异原因,在综合开展琼东南盆地构造演化、沉积充填与地球化学特征研究基础上,对影响烃源岩有机质成熟度的各要素进行逐一分析。结果表明,深水区高地温梯度、低沉积速率背景对有机质热演化有明显的促进作用,而深水区低海底温度对有机质热演化有一定的抑制作用,超压对有机质热演化作用不明显。综合盆地模拟各要素表明,深水区有机质热演化程度明显高于浅水区,深水区生烃门限浅的特点扩大了深水区烃源岩成熟面积,增加了烃源岩的生排烃量,从而提高了盆地的资源潜力。研究成果对其他深水盆地的烃源岩热演化相关研究有很好的借鉴意义。
In order to find out the reasons for the difference of organic thermal evolution of source rocks in shallow and deep water areas,on the basis of integrated study of tectonic evolution,sedimentary filling and geochemical characteristics of Southeastern Hainan Basin,the factors affecting the maturity of organic matter in source rocks were analyzed one by one. The study results show that the background of high geothermal gradient and low deposition rate in the deep water area can obviously promote the thermal evolution of organic matter,while the low bottom-water temperature in the deep water area has a certain inhibition on the thermal evolution of organic matter,and the overpressure has no obvious effect on the thermal evolution of organic matter. The integrated basin modelling shows that the thermal evolution degree of organic matter in deep water area is obviously higher than that in shallow water area,and the characteristic of shallow hydrocarbon generation threshold in deep water area enlarges the maturation area of source rock in deep water area,increases the hydrocarbon generation and expulsion capacity of source rock,and improves the resource potential of the basin accordingly. The study achievements can be used for reference in the study of thermal evolution of source rocks in other deep water basins.
In order to find out the reasons for the difference of organic thermal evolution of source rocks in shallow and deep water areas,on the basis of integrated study of tectonic evolution,sedimentary filling and geochemical characteristics of Southeastern Hainan Basin,the factors affecting the maturity of organic matter in source rocks were analyzed one by one. The study results show that the background of high geothermal gradient and low deposition rate in the deep water area can obviously promote the thermal evolution of organic matter,while the low bottom-water temperature in the deep water area has a certain inhibition on the thermal evolution of organic matter,and the overpressure has no obvious effect on the thermal evolution of organic matter. The integrated basin modelling shows that the thermal evolution degree of organic matter in deep water area is obviously higher than that in shallow water area,and the characteristic of shallow hydrocarbon generation threshold in deep water area enlarges the maturation area of source rock in deep water area,increases the hydrocarbon generation and expulsion capacity of source rock,and improves the resource potential of the basin accordingly. The study achievements can be used for reference in the study of thermal evolution of source rocks in other deep water basins.
引文
[1]谢玉洪.南海北部自营深水天然气勘探重大突破及其启示[J].天然气工业,2014,34(10):1-8.
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[7]周杰,杨希冰,甘军,等.琼东南盆地深水区断裂对沉积充填的控制作用[J].特种油气藏,2017,24(2):75-77.
[8]唐历山,朱继田,姚哲,等.琼东南盆地松南低凸起潜山演化及成藏条件[J].特种油气藏,2017,24(1):87-91.
[9]黄保家,黄合庭,李里,等.莺-琼盆地海相烃源岩特征及高温高压环境有机质热演化[J].海相油气地质,2010,15(3):11-18.
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[11]黄保家,李绪深,王振峰,等.琼东南盆地深水区烃源岩特征与天然气潜力[J].中国海上油气,2012,24(4):1-7.
[12]梁刚,甘军,李兴.琼东南盆地陵水凹陷天然气成因类型及来源[J].中国海上油气,2015,27(4):47-53.
[13]张迎朝,徐新德,甘军,等.琼东南盆地深水大气田地质特征、成藏模式及勘探方向研究[J].地质学报,2017,91(7):1620-1633.
[14]张迎朝,甘军,杨希冰,等.琼东南盆地陵水凹陷构造演化及其对深水大气田形成的控制作用[J].海洋地质前沿,2017,33(10):22-31.
[15]徐新德,张迎朝,梁刚,等.南海北部琼东南盆地深水区烃源条件及天然气成藏机制[J].天然气地球科学,2016,27(11):1985-1992.
[16]熊小峰,徐新德,郭潇潇,等.沉积过程对莺歌海盆地烃源岩生气的控制作用[J].天然气地球科学,2016,27(12):2169-2174.
[17]WAPLES D W.Time and temperature in petroleum formation:application of Lopatin’s method to petroleum exploration[J].AAPG Bulletin,1980,64(6):916-926.
[18]SWEENEY J J,BURNHAM A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,1990,74(10):1559-1570.
[19]郝芳,邹华耀,方勇,等.超压环境有机质热演化和生烃作用机理[J].石油学报,2006,37(5):9-18.
[20]万志峰,夏斌,何家雄,等.沉积盆地超压形成机制及其对油气运聚成藏过程的影响[J].天然气地球科学,2007,18(2):219-223.
[21]ALBERT Defant.Physical Oceanography[M].Oxford:Pergamon Press,1961:75-86.
[2]杨金海,李才,李涛,等.琼东南盆地深水区中央峡谷天然气成藏条件与成藏模式[J].地质学报,2014,88(11):2141-2149.
[3]姚哲,王振峰,左倩媚,等.琼东南盆地中央峡谷深水大气田形成关键要素与勘探前景[J].石油学报,2015,36(11):1358-1366.
[4]王振峰,孙志鹏,朱继田,等.南海西部深水区天然气地质与大气田重大发现[J].天然气工业,2015,35(10):11-20.
[5]雷超,任建业,李绪深,等.琼东南盆地深水区结构构造特征与油气勘探潜力[J].石油勘探与开发,2011,38(5):560-569.
[6]朱继田,裴健翔,孙志鹏,等.琼东南盆地新构造运动及其对晚期油气成藏的控制[J].天然气地球科学,2011,22(4):649-656.
[7]周杰,杨希冰,甘军,等.琼东南盆地深水区断裂对沉积充填的控制作用[J].特种油气藏,2017,24(2):75-77.
[8]唐历山,朱继田,姚哲,等.琼东南盆地松南低凸起潜山演化及成藏条件[J].特种油气藏,2017,24(1):87-91.
[9]黄保家,黄合庭,李里,等.莺-琼盆地海相烃源岩特征及高温高压环境有机质热演化[J].海相油气地质,2010,15(3):11-18.
[10]BAO Jiahuang,HUI Tian,XU Shenli,et al.Geochemistry,origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin,South China Sea[J].Marine and Petroleum Geology,2016,72(4):254-267.
[11]黄保家,李绪深,王振峰,等.琼东南盆地深水区烃源岩特征与天然气潜力[J].中国海上油气,2012,24(4):1-7.
[12]梁刚,甘军,李兴.琼东南盆地陵水凹陷天然气成因类型及来源[J].中国海上油气,2015,27(4):47-53.
[13]张迎朝,徐新德,甘军,等.琼东南盆地深水大气田地质特征、成藏模式及勘探方向研究[J].地质学报,2017,91(7):1620-1633.
[14]张迎朝,甘军,杨希冰,等.琼东南盆地陵水凹陷构造演化及其对深水大气田形成的控制作用[J].海洋地质前沿,2017,33(10):22-31.
[15]徐新德,张迎朝,梁刚,等.南海北部琼东南盆地深水区烃源条件及天然气成藏机制[J].天然气地球科学,2016,27(11):1985-1992.
[16]熊小峰,徐新德,郭潇潇,等.沉积过程对莺歌海盆地烃源岩生气的控制作用[J].天然气地球科学,2016,27(12):2169-2174.
[17]WAPLES D W.Time and temperature in petroleum formation:application of Lopatin’s method to petroleum exploration[J].AAPG Bulletin,1980,64(6):916-926.
[18]SWEENEY J J,BURNHAM A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,1990,74(10):1559-1570.
[19]郝芳,邹华耀,方勇,等.超压环境有机质热演化和生烃作用机理[J].石油学报,2006,37(5):9-18.
[20]万志峰,夏斌,何家雄,等.沉积盆地超压形成机制及其对油气运聚成藏过程的影响[J].天然气地球科学,2007,18(2):219-223.
[21]ALBERT Defant.Physical Oceanography[M].Oxford:Pergamon Press,1961:75-86.