北部湾盆地迈陈凹陷油气成藏期次、特征及模式
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摘要
北部湾盆地迈陈凹陷在斜坡带、断裂带等不同区带分别发现油气藏,为查明不同区带油气藏的油气成藏期次与特征,利用流体包裹体分析技术在迈陈凹陷开展了储层流体包裹体特征描述和成藏期次、成藏过程的研究。研究表明,迈陈凹陷至少存在3期油气充注成藏,分别是早中新世下洋组沉积时期、中中新世角尾组沉积之后、中新世末灯楼角组沉积之后。三期油气成藏具有不同的成藏特点:I期成藏油气沿断裂呈"管流"运聚成藏,II期成藏油气沿连通裂隙呈"网流"运聚成藏,III期成藏油气沿有限连通孔隙"渗流"运聚成藏。结合实例建立了迈陈凹陷不同区带的成藏模式:斜坡带为侧向运移为主、垂向运移为辅的油气成藏模式,断裂-深凹带为垂向运移为主、侧向运移为辅的油气成藏模式。
There are several oil and gas pools found in different zones(the slope zone, fault zone, etc.) in Maichen Sag, Beibuwan basin. In order to identify the stages and features of hydrocarbon accumulation in different zones, the feature of reservoir fluid inclusions, the accumulation stages and process have been studied by using fluid inclusion technology. The research results show that there are at least three stages of hydrocarbon charging and accumulation in Maichen Sag, which are the early Miocene, Middle Miocene and the late Miocene. Three-stage hydrocarbon accumulation has different features. During Stage I, oil and gas migrated and accumulated along faults as "pipe flow". During Stage II, oil and gas migrated and accumulated along the connected fractures as "network flow". During Stage III, oil and gas migrated and accumulated along the limited connected pores. Then the accumulation patterns of different zones have been established by examples. The slope zone is an accumulation pattern with lateral migration as the major and vertical migration as the minor. The deep depression zone and the fault zone are characterized by vertical migration as the major and lateral migration as the minor.
There are several oil and gas pools found in different zones(the slope zone, fault zone, etc.) in Maichen Sag, Beibuwan basin. In order to identify the stages and features of hydrocarbon accumulation in different zones, the feature of reservoir fluid inclusions, the accumulation stages and process have been studied by using fluid inclusion technology. The research results show that there are at least three stages of hydrocarbon charging and accumulation in Maichen Sag, which are the early Miocene, Middle Miocene and the late Miocene. Three-stage hydrocarbon accumulation has different features. During Stage I, oil and gas migrated and accumulated along faults as "pipe flow". During Stage II, oil and gas migrated and accumulated along the connected fractures as "network flow". During Stage III, oil and gas migrated and accumulated along the limited connected pores. Then the accumulation patterns of different zones have been established by examples. The slope zone is an accumulation pattern with lateral migration as the major and vertical migration as the minor. The deep depression zone and the fault zone are characterized by vertical migration as the major and lateral migration as the minor.
引文
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[15]宋胜浩.从断裂带内部结构剖析油气沿断层运移规律[J].大庆石油学院学报, 2006, 30(3):17-20.
[16]郝芳,邹华耀,方勇,等.断—压双控流体流动与油气幕式快速成藏[J].石油学报, 2004, 25(6):38-43, 47.
[2]李美俊,王铁冠,刘菊,等.由流体包裹体均一温度和埋藏史确定油气成藏时间的几个问题——以北部湾盆地福山凹陷为例[J].石油与天然气地质, 2007, 28(2):151-158.
[3]赵力彬,黄志龙,高岗,等.关于用包裹体研究油气成藏期次问题的探讨[J].油气地质与采收率, 2005, 12(6):6-9, 18.
[4]柳广弟,张仲培,陈文学,等.焉耆盆地油气成藏期次研究[J].石油勘探与开发, 2002, 29(1):69-71.
[5]袁际华,柳广弟,姜丽娜,等.海安凹陷泰州组流体包裹体特征与油气成藏期次分析[J].西安石油大学学报(自然科学版),2011, 26(1):34-36, 41.
[6]毛毳,陈勇,周瑶琪,等.改进后的烃类流体包裹体热力学模拟方法及其在油气成藏研究中的应用[J].吉林大学学报(地球科学版), 2015, 45(5):1352-1364.
[7]江汝锋,查明,陈中红,等.克拉玛依油田石炭系火山岩油气成藏期次及成藏演化[J].西安石油大学学报(自然科学版),2013, 28(6):27-33.
[8]魏春光,何雨丹,耿长波,等.北部湾盆地北部坳陷新生代断裂发育过程研究[J].大地构造与成矿学, 2008, 32(1):28-35.
[9]朱伟林,江文荣.北部湾盆地涠西南凹陷断裂与油气藏[J].石油学报, 1998, 19(3):6-10.
[10]李春荣,张功成,梁建设,等.北部湾盆地断裂构造特征及其对油气的控制作用[J].石油学报, 2012, 33(2):195-203.
[11]李颂,杨小晏.北部湾盆地涠西南凹陷油气运聚成藏特征[J].世界地质, 2012, 31(2):365-370.
[12]张景茹,何家雄,龚晓峰,等.南海北部湾盆地福山凹陷含油气系统与油气运聚成藏规律[J].海洋地质前沿, 2012, 28(1):30-37.
[13]刘恩涛,王华,林正良,等.北部湾盆地福山凹陷构造转换带及其油气富集规律[J].中南大学学报(自然科学版), 2012,43(10):3946-3953.
[14]于俊吉,罗群,张多军,等.北部湾盆地海南福山凹陷断裂特征及其对油气成藏的控制作用[J].石油实验地质, 2004, 26(3):241-248.
[15]宋胜浩.从断裂带内部结构剖析油气沿断层运移规律[J].大庆石油学院学报, 2006, 30(3):17-20.
[16]郝芳,邹华耀,方勇,等.断—压双控流体流动与油气幕式快速成藏[J].石油学报, 2004, 25(6):38-43, 47.