西峰油田白马中区长8段储层裂缝发育特点及水淹预测

Developing characteristic and water flooding prediction of the reservoir fracture of mid Baima area Chang-8 formation in Xifeng oilfield

西峰油田白马中区长8段为低孔低渗储层,该油田主要采用超前注水和压裂方式投产,致使储层中的隐裂缝开启。隐裂缝的开启一方面起到了油气运移通道的作用,另一方面使注水沿裂缝窜流,造成油井水淹。通过该区裂缝产生的应力场背景、岩心发育特征和特殊测井响应特征等研究对裂缝段进行了识别;根据常规测井系列深、浅感应电阻率的变化与测试结果,定量解释了西峰油田白马中区部分井的裂缝率,结合用生产动态资料判断的暴性水淹井和水淹井的来水方向,指出凡是由裂缝引起暴性水淹的井一般都遵循由低裂缝率到高裂缝率的规律。

The Chang - 8 formation reservoir of mid Baima area in Xifeng oilfield is low porous and low permeable reservoir. The field production mainly adopts advancing water injection and fracturing, which caused subtle fractures open. On one hand, the open of concealed fractures plays the role of oil and gas migration channel; on the other hand, it can make the injected water fluid channeling a-long the fractures, which caused water flooding. This paper tries to identify the fracture segment based on the research on stress field background, core developing characteristics and special logging response characteristics. According to the change between deep and shallow inductivity of the conventional logging series and the test result, this paper quantitatively interprets the fracture rate of some wells in mid Baima area, analyzes the sudden water flooding wells and the direction of water flooding based on dynamic materials, and points out the direction of water flooding is from the low to high as a rule of sudden water flooding well induced by fractures.