塔中北斜坡走滑断裂断距对碳酸盐岩油气藏的影响

塔中北斜坡奥陶系碳酸盐岩的储层改造和油气分布,都受到走滑断裂的影响。由于区域内较大规模的走滑断裂均表现为北东向,水平断距较小,使得利用地震资料直接计算断距时存在着较大的困难。实际上,走滑断裂还普遍表现出北西向拉张特征,并沿断裂走向形成了宽度不同的拉分区域。断裂多沿北东向平直延伸,表明这些拉分区域的宽度和高度主要是受局部应力作用而形成的。这些拉分区域的宽度和高度在三维地震资料中较容易识别。根据断裂的拉分特征,提出通过计算拉分区域的宽度和高度间接识别走滑断裂的断距的方法。断距计算结果符合走滑断裂发育的地质规律,断距较大处是走滑断裂活动性较强的区域,同时也是储层改造作用强烈和油气分布较好的区域。

塔中北斜坡走滑断裂断距及其与油气的关系

塔中北斜坡奥陶系碳酸盐岩储集层内的油气分布受北东向走滑断裂的影响,走滑断裂的断距影响着油气富集的程度。由于储集层埋藏较深,用来描述储集层分布的三维地震资料的分辨率和信噪比都较低,使得利用地震资料计算断距比较困难。又由于走滑断裂的水平断距过小,垂向断距变化较大,进一步影响着断距的计算。为此通过三维地震资料分析发现,走滑断裂普遍表现出北西向拉张的特征,并沿断裂走向形成了宽度不同的拉分区域。根据拉分特征,提出通过计算走滑断裂拉分区域的宽度和高度的方法,来间接确定走滑断裂的断距。计算结果不但符合走滑断裂发育的地质规律,还同该区域的油气分布有较好的吻合性,能够用来认识区域内油气的分布。

Power Allocation for Energy Harvesting in Wireless Body Area Networks

Wireless Body Area Networks(WBANs) are expected to achieve high reliable communications among a large number of sensors.The outage probability can be used to measure the reliability of the WBAN.In this paper,we optimize the outage probability with the harvested energy as constraints.Firstly,the optimal transmit power of the sensor is obtained while considering a single link between an access point(AP) located on the waist and a sensor attached on the wrist over the Rayleigh fading channel.Secondly,an optimization problem is formed to minimize the outage probability.Finally,we convert the non-convex optimization problem into convex solved by the Lagrange multiplier method.Simulations show that the optimization problem is solvable.The outage probability is optimized by performing power allocation at the sensor.And our proposed algorithm achieves minimizing the outage probability when the sensor uses energy harvesting.We also demonstrate that the average outage probability is reduced with the increase of the harvested energy.