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阵列侧向测井反演方法研究与应用
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摘要
阵列侧向测井是一种新型测井方式,能够同时给出5~6条不同探测深度的测井曲线,因而可给出比较丰富的地层信息。除浅探测深度的响应以外,视电阻率受井眼的影响较小,适用于薄层测井和测量井周围非均匀地层的性质。另外,阵列侧向经过反演可得到较为精确的侵入半径、侵入电阻率和原状地层真电阻率等信息。因此,对阵列侧向测井反演方法的研究,具有一定的理论和现实意义。
     阵列侧向测井正演问题是一偏微分方程边值问题,利用变分原理可将偏微分方程边值问题转化为泛函极小问题,因而可使用有限元理论来求解。建立了适合阵列侧向测井响应的泛函表达式,采用网格自动剖分和边界处理技术,从而把求解域离散化。经过单元组装,形成求解域的总矩阵方程,使用多核并行优化的前线解法进行求解,最终实现了阵列侧向测井响应的正演计算。并针对斜井和水平井,对有侵和无侵等条件下的阵列侧向测井响应进行了数值模拟。
     阵列侧向测井反演问题一般转化为优化问题进行求解,通过对高斯-牛顿法、Marquardt等传统方法理论上的分析,指出了其在反演计算中所存在的缺点和修订措施,特别给出了Jacobi矩阵计算和阻尼因子定义方式等方面适合阵列侧向测井反演的方案。实现了三参数(原状地层电阻率、侵入带地层电阻率和泥浆侵入半径)和四参数(冲洗带地层电阻率、冲洗带泥浆侵入半径、过渡带泥浆侵入半径和原状地层电阻率)反演。通过对薄层的反演计算,在计算过程中,该改进算法收敛速度快,计算结果准确。
     传统优化方法不论怎样改进,仍是一种局部优化方法。而差分进化智能算法是一种全局优化算法,但其后期收敛速度较慢,不能适应实际反演计算。通过把传统优化方法和差分进化智能算法相结合,提出了一种差分进化混合反演算法。计算案例表明,该混合反演算法有全局搜索能力强、局部搜索速度快以及抗噪能力强等特点。
     煤层气作为一种新型能源,其勘探开发已经引起广泛重视。而裂隙评价是煤层评价的关键,对煤层气勘探开发及后期管理均有十分重要的作用。使用阵列侧向测井研究了煤层的裂隙参数,从计算结果可以看出,阵列侧向测井响应与裂缝孔隙度、裂缝倾角之间存在良好的相关性。并用Marquardt反演方法对其进行反演处理,可确定相应的裂缝孔隙度及裂缝倾角。
The Array Lateral logging is a new logging mode which can provide five-six logging curves with different investigation depth simultaneously so as to obtain rich formation information. The Array Lateral logging whose apparent resistivity except shallow investigation depth is little affected by borehole is applied to thin layer and inhomogeneous formation around measured well. Some information, such as invasion radius, invasion resistivity, virgin zone resistivity are accurately obtained by inversion. Therefore, the research on inversion of Array Lateral logging has important theoretical and practical significance.
     The forward problem of Array Lateral logging is a kind of boundary value problem in partial differential equations which can be solved by finite element method after being transformed into minimum problem of norm function by variational principle. Using the automatic mesh generation and boundary processing method, the solution domain is discretized after building up the norm function suitable for the response of Array Lateral logging. The total matrix equation of solution domain is formed by unit assembly. The frontier solution of multiple cores parallel optimization is applied to achieve the forward calculation finally. Besides, the response of Array Lateral logging with invasion or non-invasion in deviated well and horizontal well is numerically simulated.
     In general the inversion problem of Array Lateral logging is solved by being transformed into optimization problem. By analyzing the traditional methods theoretically, such as gauss-newton method, Marquardt method, the existing disadvantages in inversion and corresponding correction measures are pointed out, especially some measures suitable for inversion of Array Lateral logging, like computing the Jacobi matrix and defining damping factor. The three parameters inversion (virgin zone resistivity, invading zone resistivity and invasion radius) and four parameters inversion (flushed zone resistivity, invasion radius of flushed zone, invasion radius of transitional zone and virgin zone resistivity) are carried out. By improving the inversion algorithm for thin layer, the calculation results with fast convergence are accurate.
     Whatever we improve the traditional methods, they still belong to local optimization. However, the differential evolution algorithm is a type of global optimization method with slow convergence at later stage and can’t be used for practical inversion. A hybrid inversion method of differential evolution algorithm is proposed in combination with traditional optimization methods and differential evolution algorithm. The calculation results show the hybrid inversion has characteristics of strong global searching ability, fast local searching speed and strong anti-noise ability.
     The coal bed methane is a kind of new energy and its exploration and development has attracted extensive attention. As a key to the evaluation of coal bed, the fracture evaluation plays an important role in exploration and development of coal bed methane and later stage management. The Array Lateral logging is applied to study the fracture parameters in coal bed. The results show that the logging response has good correlation with fracture porosity and fracture dip. Using Marquardt inversion for the response, the corresponding fracture porosity and fracture dip can be obtained.
引文
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