Within New Zealand, the East Coast Basin represents the primary shale oil and gas play in which the Whangai Formation is widespread. This formation is oil and gas prone and prevalent throughout a large area of the East Coast Basin and is typically composed of the Upper Calcareous, Porangahau, and Rakauroa Members.The primary goal of this study was to develop an integrated methodology to define the best stimulation intervals in the formation. To do this, we evaluated four different definitions of the brittleness index for the Rakauroa Member, the only member drilled in the three study wells. A Python-based automated process was specifically developed for this purpose and uses four indexes: elastic parameters, internal friction coefficient, mineralogy, and total organic carbon content. Through this process, these four indexes were analytically combined to select intervals with the highest brittleness values and identify the optimum stimulation interval and most desirable perforation intervals in the pay zone.Our results show that the Whangai Formation contains 25% clay (and reaching up to 70% clay content in some intervals) and a maximum organic matter content of 2.54%. The geomechanical model indicates a uniform distribution of high pore pressure across the entire reservoir section. The interval between 1497 and 1750 m in the Opoutama-1 well located in the Coastal block presents high combined brittleness indexes, indicating excellent characteristics from a stimulation standpoint.

中文翻译：

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脆性模型选择了新西兰旺艾组页岩烃源岩中的最佳增产带

在新西兰内部，东海岸盆地是旺盖组广泛分布的主要页岩油气层。该地层易生油气，在东海岸盆地的大部分地区普遍存在，通常由上钙质，波朗阿高和拉库罗阿成员组成。这项研究的主要目的是开发一种综合方法来确定最佳增产措施。编队的间隔。为此，我们评估了Rakauroa成员的脆性指数的四种不同定义，Rakauroa成员是在三个研究井中唯一钻出的成员。为此专门开发了一个基于Python的自动化过程，该过程使用四个指标：弹性参数，内部摩擦系数，矿物学和总有机碳含量。通过这个过程，通过分析将这四个指标结合起来，以选择脆性值最高的层段，并确定该产层中的最佳增产层段和最理想的射孔层段。我们的研究结果表明，旺艾组含25％的粘土（粘土含量最高可达70％）在一定时间间隔内），最大有机物含量为2.54％。地质力学模型表明，整个储层中高孔隙压力的均匀分布。位于沿海地块的Opoutama-1井的1497和1750 m之间的间隔表现出较高的综合脆性指数，从增产角度看，表明具有出色的特性。我们的研究结果表明，旺盖组含25％的黏土（在某些间隔内黏土含量达到70％）和最大有机物含量为2.54％。地质力学模型表明，整个储层中高孔隙压力的均匀分布。位于沿海地块的Opoutama-1井的1497和1750 m之间的间隔表现出较高的综合脆性指数，从增产角度看，表明具有出色的特性。我们的研究结果表明，旺艾组的泥质含量为25％（在某些时间间隔内达到70％），最大有机物含量为2.54％。地质力学模型表明，整个储层中高孔隙压力的均匀分布。位于沿海地块的Opoutama-1井的1497和1750 m之间的间隔表现出较高的综合脆性指数，从增产角度看，表明具有出色的特性。