摘要
饶阳凹陷沙河街组普遍发育异常高压,而异常高压与油气关系密切。采用平衡深度法计算了该区沙河街组的异常压力。结果表明:饶阳凹陷异常高压主要发育在凹陷中部洼槽区,向凹陷边缘压力逐渐降低。快速沉积导致的欠压实作用和烃类生成是该区异常高压形成的主要原因。异常高压对油气运聚具有重要的影响:一方面,异常高压为油气提供了重要的运移动力;另一方面,异常高压在一定的地质背景下控制了油气分布,油气藏多分布在异常高压层内或邻近异常高压带,同时异常高压形成的流体势能驱动流体从凹陷中心向边缘流动,最终形成了油气藏围绕生油洼槽呈"环状"分布的格局。
Abnormal high pressure is widely distributed in Shahejie Formation of Raoyang Sag, which is closely related with hydrocarbon accumulation. Based on the logging data, this paper analyzed the distribution and forming mechanism of abnormal high pressure by equilibrium depth method. The results show that abnormal high pressure is mainly distributed in hydrocarbon generation sag areas, and it decreases towards the margin of sag. Uncompaction caused by rapid deposition and the hydrocarbon generation are the main reasons for the forming of abnormal high pressure. The effects of abnormal high pressure on hydrocarbon accumulation are significant. On one hand, abnormal high pressure is an important dynamic source for hydrocarbon migration. On the other hand, abnormal high pressure controls the distribution of oil and gas under certain geologic conditions. The reservoirs are always found in high pressure formations or surrounding high pressure areas. Meanwhile the fluid potential resulted from abnormal high pressure drove fluids to migrate from the center to the margin of sag, and oil and gas are distributed around hydrocarbon generation sag.
出处
《岩性油气藏》
CSCD
2014年第6期15-19,共5页
Lithologic Reservoirs
基金
国家油气重大专项"中国大型气田形成条件
富集规律及目标评价"(编号:2011ZX05007)资助
关键词
异常高压
油气成藏
成藏机制
饶阳凹陷
abnormal high pressure
hydrocarbon accumulation
formation mechanism
Raoyang Sag
