Comparative Characterization of Petrophysical and Mechanical Properties of Siliciclastic Reservoir Rocks within a compressional structure of the Teapot Dome Oilfield, Wyoming, USA

Rotimi Oluwatosin John, Ogunkunle Temitope, Onuh Charles Yunusa, A. Anthony, Enaworu Efeoghene, Ekeledo Ifeoma Faith, G. Amaechi
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引用次数: 1

Abstract

Abstract Working with subsurface engineering problems in Hydrocarbon exploration as regard rock elastic and petrophysical properties necessitate accurate determination of in-situ physical properties. Several techniques have been adopted in correlating log-derived parameters with petrophysical and mechanical behavior of the rocks. However, limited field applications show there are no particular parameters and correlations that are generally acceptable due to the regional variation in geologic features (i.e., degree of mineralogy, texture, etc.). This study presents a method that assesses the disparity in petrophysical properties of oil and gas reservoir rocks in relation to their elastic/mechanical properties from 10 well-logs and 3D migrated seismic data. Two distinct facies were identified from seismic data after computing attributes. Reflection strength attribute of 2.5 and above depicts Bright spots within the central section of the field as clearly revealed by Variance and Chaos attributes. Formation properties calculated from logs were conformally gridded in consonance with the reflection patterns from the seismic data. The average Brittleness index (BI) of 0.52 corresponds to Young’s modulus (E) values of between 8 and 16 for the dense portion. This portion is the laminated, reasonably parallel, and undeformed part, flanked by the unlaminated and chaotic zones. From cross plots, the distinguished lower portion on the plot is the segment with higher sand of more than 50 %. This segment corresponds to the reservoir in this study as confirmed from the genetic algorithm neural network Acoustic impedance inversion process result. Similarly, the plot of Compressional velocity (Vp) and Poisson’s ratio (ν), reveals the laminated sand value of not less than 0.32 of ν, and Vp of about 4.2 km/s. The average porosity is about 16 %, average water saturation is about 16 %, and average permeability is approximately 25 md. Rock properties trends in a unique pattern and showing fluctuation that confirms the compressive nature of the structure with corresponding petrophysical properties. This trend is sustained in permeability computed and suggests a significant gravity-assisted compaction trend and fluid movement. It gives a reasonable idea of the fluid movement interplay and mechanical property variation within the sequence and across the dome. This part probably has been subjected to fair compressional deformational forces initiated from outside the survey.
美国怀俄明州Teapot Dome油田挤压构造中硅质储层岩石物理力学性质对比表征
摘要在油气勘探中,地下工程问题涉及岩石弹性和岩石物性,因此需要准确地确定原位物性。在将测井参数与岩石的物理和力学行为联系起来时,采用了几种技术。然而,有限的现场应用表明,由于地质特征(即矿物学程度、结构等)的区域差异,没有普遍可接受的特定参数和相关性。该研究提出了一种方法,通过10口测井和3D偏移地震数据,评估油气储层岩石物理性质与弹性/力学性质之间的差异。计算属性后,从地震资料中识别出两种不同的相。2.5及以上的反射强度属性描绘了场中央部分的亮点,方差和混沌属性清楚地揭示了这一点。根据测井计算的地层性质与地震资料的反射模式进行了保形网格化。致密部分的平均脆性指数(BI)为0.52,对应的杨氏模量(E)值在8 ~ 16之间。这部分是层压的、相当平行的、未变形的部分,两侧是未层压的和混沌的区域。从交叉样地看,样地下部明显为含沙量大于50%的段。遗传算法神经网络声阻抗反演过程结果证实,该段对应本研究的储层。同样,纵波速度(Vp)和泊松比(ν)曲线也显示了层压砂值不小于ν的0.32,Vp约为4.2 km/s。平均孔隙度约为16%,平均含水饱和度约为16%,平均渗透率约为25md。岩石性质呈独特的趋势,呈现波动,证实了具有相应岩石物理性质的结构的压缩性质。这一趋势在渗透率计算中得到了延续,表明存在明显的重力辅助压实趋势和流体运动。给出了层序内和圆顶内流体运动、相互作用和力学性能变化的合理概念。这部分可能受到了来自外部测量的相当大的压缩变形力。
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