巴喀油田裂缝发育特征及常规测井识别方法

Feature of Fracture Development and Evaluate Fractures by Conventional Logging Data in Baka Oilfield

巴喀油田中侏罗统西山窑组砂岩属低孔特低渗透裂缝性储集层。裂缝的高渗透性和渗透率非均质性影响了巴喀油田注水开发方案的部署。在结合区域构造背景和岩心观察基础上,通过对常规测井裂缝响应特征分析,应用综合概率指数与分形维数相结合的方法,开展了常规测井曲线的裂缝识别研究。巴喀油田主要发育中高角度构造剪切裂缝,近NWW向和NNE向两组裂缝在工区广泛发育。应用综合概率指数与分形维数相结合法对巴喀油田砂岩裂缝取得了良好识别效果。

Fractured sandstone reservoir of Middle Jurassic in Baka oilfield is low porosity and lowest permeability.High seepage and permeability anisotropy of the fractures are the main factors of influencing the development program of Baka oilfield,the way, which is based on using data of core and area exploration,analyzes and studys the logging responses of fratures in reservoir by combining conventional logging and finally uses CWP and DFA to discriminate the degree of fracture by conventional logging.Most of fractures are shear fractures with middle-high dip angles.There are usually two groups of fractures of NWW and NNE in Baka oilfield.This way is good to identify fractures in Baka oilfield.