石油与天然气地质 ›› 2010, Vol. 31 ›› Issue (5): 664-670.doi: 10.11743/ogg20100516

• 石油与天然气地质 • 上一篇    下一篇

辽东湾地区辽西低凸起油气田成藏地质条件的差异

  

  1. 中国石油大学油气资源与探测国家重点实验室，北京102249
  • 出版日期:2010-10-28 发布日期:2010-12-10
  • 作者简介:李潍莲（1969—），女，副教授，石油地质学。
  • 基金资助:

    国家“十五”重大科技攻关项目（SC04TJ-TQL-001）。

Differences of geological conditions of hydrocarbon accumulation am ong fields in the L iaoxi Low Uplift，the L iaodong Bay

  • Online:2010-10-28 Published:2010-12-10

PDF (PC)

682

被引次数

56

摘要：

在油气藏特征、油气来源、输导体系等综合对比分析的基础上，总结了辽东湾地区辽西低凸起JZ20-2凝析气田、JZ25-1S油气田、SZ36-1油田3个大中型油气田成藏模式的差异性。JZ20-2为单向双源成藏模式，以东营组二段下亚段—东营组三段区域超压盖层分隔，上部东营组正常地层压力油藏为辽中北洼东营组三段烃源岩排出的油气沿东营组二段三角洲砂体运聚而成，下部沙河街组及潜山超压凝析气藏则是由辽中北洼沙河街组烃源岩释放出的超压凝析油气沿不整合运聚而成。JZ25-1S为双向油源混合型成藏模式，辽西凹陷的油气沿西侧辽西1号、辽西2号边界断层垂向运移到辽西低凸起，同时辽中凹陷油气沿东斜坡不整合、砂体侧向运移，最终两个方向油气在JZ25-1S构造沙河街组二段砂体或太古界潜山储集体混合聚集成藏。SZ36-1为单向油源成藏模式，辽中南洼的油气沿油源断层-三角洲砂体大规模、长距离运移至SZ36-1构造东营组二段砂体中聚集成藏。

关键词: 油-源对比, 输导体系, 油气成藏模式, 油气藏特征, 辽西低凸起, 辽东湾

Abstract:

Based on comprehensive analyses of reservoir features，source rocks and carrier systems，this paper summarizes differences ofhydrocarbon accumulation among threem iddle and large oilfields（the JZ20-2，JZ25-1S and SZ36-1oilfields）in the Liaoxi Low Uplift，the Liaodong Bay area.For the JZ20-2oilfield，the hydrocarbon accumulation pattern is singlem igration direction and double sources.Separated by the regional overpressure cap rocks consisting of the lower part of the2 nd member and the3 rd member of the Dongying Formation，the upper oil pool in the Dongying Formation has normal pressure and its hydrocarbonswere generated by source rocks in the3 rd member of the Dongying Formation in the northern Liaozhong subsag，andm igrated along the delta sandbodies in the2 nd member of the Dongying Formation，while the lower condensate gas pool in the Shahejie Formation and buried hill has overpressure and the hydrocarbons were generated by source rocks in the Shahejie Formation in the northern Liaozhong subsag and m igrated along unconform ities.For the JZ25-1S oilfield，the hydrocarbon accumulation pattern is doublem igration direction and m ixed sources.Hydrocarbons sourced from the Liaoxi sag m igrated vertically to the Liaoxi low uplift along the Liaoxi-1and Liaoxi-2boundary faults，and hydrocarbons sourced from the Liaozhong sag m igrated laterally along unconform ities and sandbodies in the eastern slope. Finally，these hydrocarbonsm ixed and accumulated in the sandstone of the2 nd member of the Shahejie Formation in the JZ25-1S structure and the reservoirs in Archaeozoic buried hills.For the SZ36-1oilfield，hydrocarbon accumulation pattern is single m igration direction and single source.Hydrocarbon sourced from the southern Liaozhong subsagm igrated in large scale and long distance along the faults connecting source rocks and reservoirs and delta sandbodies to sandstones in the2 nd member of the Dongying Formation in the SZ36-1structure.

Key words: oil-source correlation, carrier system, hydrocarbon accumulation pattern, reservoir characteristics, Liaoxi Low Uplift, Liaodong Bay