桩海潜山场-势效应与油气聚集的关系

Relationship between dynamic fields and hydrocarbon accumulation in buried hill of Zhuanghai area

利用钻井、测井、三维地震及速度谱资料,分别采用有限元法、Fillippone法和Hubbert法模拟和研究了胜利油田桩海地区太古界潜山油藏应力场、压力场及流体势场的特征,并分析讨论了其与油气聚集之间的关系。研究结果表明,潜山油气藏的形成直接受地应力场、压力场、温度场及流体势场的控制和制约。表现为:现今油气的富集区基本上位于地应力场中的张应力和张扭应力分布区、整体正常压力系数分布的相对高值区和地温梯度的相对高值区。潜山油气运聚在宏观上遵循由高势区向低势区运移、聚集的规律,但在局部地区,油气的富集还与流体势场等值线的形态等因素密切相关。

The data of drilling, logging,3D seismic and velocity spectrum were used to simulate the stress field, pressure field and fluid potential field of Archaean buried hill oil pool of Zhuanghai area in Shengli Oilfield with the finite element method, Fillippone method and Hubbert method. The characteristics of dynamic fields and the relationship between dynamic fields and hydrocarbon accumulation were analyzed. It is revealed that hydrocarbon accumulation of oil pool in buried hill was controlled directly by dynamic fields. The tensile stress, higher pressure coefficient in whole normal condition and higher ground temperature gradient were respon- sible for abundance of hydrocarbon accumulation. In addition, oil and gas in buried hill migrated from high fluid potential zone to low potential zone and accumulated in the sealed low potential zone. The efficiencies of oil and gas migration and accumulation were influenced greatly by the shapes of contour line of fluid potential field in local area.