新庄油田南三块断裂带保存条件研究

Preservation conditions of the southern 3 area fault zones in Xinzhuang oilfield,Henan,China

河南新庄油田核桃园组断块稠油藏埋藏浅，油藏保存条件主要受控于断层的封闭性。根据地层流体对比分析结果，计算断层的断面压力和泥质涂抹系数，结合区域动、静态资料，对油田南三块的断层封闭性进行从定性到定量评价。研究表明，断层处于半封闭状态，在一定程度上受地表渗入水的影响整体保存条件较差，但随埋深的增加保存条件交好。研究区的泥质涂抹系数主要在40％～50％之间，即断层的侧向封闭性中等，油藏的保存条件主要取决于断面压力的大小。断层埋深越大，倾角越小，断面压力越大，导致断层所控制的油藏保存条件也就越好，反之则保存条件越差。

The fault block reservoirs of the Paleogene Hetaoyuan Formation in the Xinzhuang oilfield are shallow heavy oil reservoirs. The conservation conditions of the reservoirs are controlled by the fault sealing ability. Based on the comparison and analysis of the formation fluids, the calculation of the pressure exerted on the fault zone and SSF, and combined the dynamic data with the static data, the authors make an evaluation of the fault sealing ability in the southern 3 area fault zones of the oilfield from the qualitative to quantitative. The studies show that the fault is in a semi-closed state and is effected by the surface infiltration water in a certain extent. So as a whole, the preservation conditions of the fault are poor, but getting better with the buried depth increasing of faults. TheSSF of the study region mainly is 40%-50%. This means that the lateral seal of faults is better. The preservation conditions of oil pools rely on the range of the pressure exerted on the fault zone. The deeper the buried depth, the smaller the angle, and the higher the pressure, the better the conservation conditions of the oil reservoir controlled by the fault are, or they would be worse.