JZS油田潜山裂缝储层形成机制及分布预测

Formation mechanism and distribution of fractured buried hill reservoir in JZS oilfiled

黄保纲 汪利兵 赵春明 杨庆红 曹树春 童凯军 宋洪亮

Huang Baogang Wang Libing Zhao Chunming Yang Qinghong Cao Shuchun Tong Kaijun Song Hongliang

依据岩石化学指标和微观特征,JZS潜山纵向上自上而下化学风化程度相应地可划分为风化、半风化和未风化3个级别。以岩心观察、岩石薄片鉴定和成像测井等资料为基础,结合生产测井资料,认为JZS潜山由表及里也可分为风化壳、半风化壳和基岩3个带,与化学风化级别相对应;潜山储层储集空间主要为半风化壳的构造缝及风化壳的溶蚀缝;裂缝储层发育受岩性、构造运动及风化溶蚀作用等因素综合控制,主控因素是构造运动。按断裂期次及倾角大小,JZS潜山构造缝可划分为4类,即早期半充填-充填水平缝、早期半充填-充填垂直缝、晚期半充填碎裂缝和晚期开启倾斜缝。应用原油包裹体检测技术确定JZS潜山主要有效裂缝为晚期开启倾斜缝和半充填碎裂缝。通过岩心和成像测井资料标定,建立了JZS潜山常规测井资料识别有效裂缝的标准并重构有效裂缝识别曲线。利用重构曲线,进行裂缝储层反演及分布预测。该方法预测结果与其他地球物理方法预测结果吻合较好,为开发井部署提供了地质依据。

According to litho-chemical index and microscopic features,the buried hill in JZS oilfield can be divided vertically from top to bottom into three zones with different levels of chemical weathering:weathered,semi-weathered and un-weathered zones.Similarly,based on core observation,thin section analysis and image logging and in combination with production logging data,it also can be divided into three zones from surface to core:weathered crust,semi-weathered crust and basement,corresponding to the three chemical weathering levels respectively.The reservoir space of buried hill is dominated by structural fractures in semi-weathered crust and the solution fractures in weathered crust.The development of fracture reservoir is controlled by multiple factors such as lithology,tectonic movement,weathering and dissolution,of which tectonic movement is the main controlling factor.According to the timing of faults and their dip angle,the structural fractures of buried hill in JZS can be grouped into four types:early semi-filled/filled horizontal fracture,early semi-filled/filled vertical fracture,late semi-filled cataclastic fracture and late open slant fracture.By using crude oil inclusion detection technique,we recognized that the main effective fracture types of the buried hill in JZS are late semi-filled cataclastic fracture and late open slant fracture.We also established criteria for identifying effective fractures with conventional logging data calibrated by core and image logging data and restructured a new effective structure identification curve for fractured reservoir inversion and distribution prediction.Application shows that the prediction results of this method correlate well with that of other geophysical methods.This method provides the neccesary geological basis for development well emplacement.

10.11743/ogg20110509