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degree of fracture development
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     The method of confirming fracture parameter and development degree in carbonate reservoir
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     Study on the degree of fracture development in fractured formation is very important.
     裂缝发育程度在裂缝性地层的研究中非常重要。
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     GREY CLUSTER EVALUATION OF THE DEGREE OF FRACTURE DEVELOPMENT IN SINGLE WELL
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Study on the degree of fracture development in fractured formation is very important. A new method for discriminating it using conventional log data is put forward. Formation conductivity and the features on resistivity curve within the interval of fractured formation increase due to the presence of fracture. Thus three parameters that reflect the degree of fracture development within shallow, intermediate and deep radial investigation depths are extracted. They are SR/R XO , SR 2/(R...

Study on the degree of fracture development in fractured formation is very important. A new method for discriminating it using conventional log data is put forward. Formation conductivity and the features on resistivity curve within the interval of fractured formation increase due to the presence of fracture. Thus three parameters that reflect the degree of fracture development within shallow, intermediate and deep radial investigation depths are extracted. They are SR/R XO , SR 2/(R XO ·R I) and SR 3/(R t·R I·R XO ). Resistivity of non-fractured formation and the criteria for fracture discrimation with the three parameters are determined for model samples. Then they are used to discriminate the degree of fracture development for non-model samples. This method is used in fractured sandy-conglomerate formation, Xinjiang Oilfield. Case history shows the result is good.

裂缝发育程度在裂缝性地层的研究中非常重要。提出了利用常规测井资料识别裂缝发育程度的新参数和方法。根据裂缝的存在能增加地层的导电性和裂缝性地层电阻率曲线特征 ,提取反映浅、中、深探测范围内裂缝发育程度的 3个参数 ,即 SR/ RXO、SR2 / (RXO· RI)和 SR3/ (Rt· RI· RXO) ;在模型样本上确定出非裂缝层的电阻率和以上 3参数识别裂缝发育程度的标准 ,然后用于识别非模型样本的裂缝发育程度。在新疆某油田裂缝性砂砾岩地层的应用表明 ,效果良好。

As a novel multiparameter non-linear classification , the grey cluster method may be used for more accurately evaluating certain complicated geological parameters as the degree of fracture development, etc. , by which the one-sidedness formed by the evaluation only with single parameter can be greatly decreased and the multi-solvability caused by use of linear methods can be overcome. On the basis of extracting 15 parameters as log parameter, logging shows and sedimentary mi-crofacies, etc. , the change...

As a novel multiparameter non-linear classification , the grey cluster method may be used for more accurately evaluating certain complicated geological parameters as the degree of fracture development, etc. , by which the one-sidedness formed by the evaluation only with single parameter can be greatly decreased and the multi-solvability caused by use of linear methods can be overcome. On the basis of extracting 15 parameters as log parameter, logging shows and sedimentary mi-crofacies, etc. , the change law of each parameter with the degree of fracture development was investigated and a manifest function expressing the assessment grade of each parameter to the degree of fracture development was set up. According to the data collected from tested layers, a pilot calculation was carried out to determine whether the model may be used to make a prediction, then, on the basis of above-mentioned manifest function and of the initial parameters of evaluating untested layers, the degree of fracture developm ent in the untested layers was predicted by the model. Through prediction it is found that the assessment grade of the degree of fracture development in certain untested layers is high, therefore their development potential should be taken into account. The research results indicate that this method is of many advantages, such as suitable evaluation parameters, scientific operational rule, high modeling accuracy and credible prediction outcome,etc.

灰色聚类方法是一种新型的多参数非线性分类法,能大大降低仅由单一参数评价所带来的片面性,并能克服线性方法的多解性,可以用来对裂缝发育程度之类的复杂地质参数进行更准确的评价。通过提取包括测井参数、录井显示特征以及沉积微相等多达15种控制或反映裂缝发育程度的参数,研究各种参数随裂缝发育程度的变化规律,建立各个评价参数对于裂缝发育程度评价级别的白化函数。以已测试层作为建模样本层,对已测试层进行模型试算以确定模型是否可以用来进行预测,用所建立的白化函数与未测试层的评价原始参数进行运算,对未知层的裂缝发育程度作出预测,预测结果发现有一定数量的未测试层裂缝发育程度评价级别较高,对其开发潜力应予以重视。研究表明该方法参数提取适当、运算法则科学、建模精度较高、预测结果可信。

Fracture development in Qijia buried hill trap of Huanxiling oilfield has been studied by using fractal theory to find favorable oil and gas accumulation. The result of research is that fractures are most developed in trap 2 and 3, where the most favorable hydrocarbon accumulations in Qijia buried hill are located; fractal theory can quantitatively assess the degree of fracture development in fractured buried hill reservoir.

应用分形理论对欢喜岭油田齐家古潜山圈闭裂缝发育程度进行研究 ,以确定有利的油气聚集区。研究结果认为 :2号和 3号圈闭裂缝最发育 ,是齐家古潜山的最有利油气聚集区 ;应用分形理论对裂缝性潜山油藏各圈闭的裂缝发育程度可以进行定量评价。

 
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