U.S. Geological Survey 2010 Petroleum Resource Assessment of the National Petroleum Reserve in Alaska (NPRA): GIS Play Maps

The 2010 updated assessment of NPRA evaluated each of the 24 plays based on the availability of new geologic data available from exploration activities and scientific research. Quantitative assessments were revised for 11 plays, and no revisions were made for 9 plays. Estimates of the volume of technically recoverable, undiscovered oil and nonassociated gas resources in these 20 plays are reported elsewhere (Houseknecht and others, 2010). The NPRA assessment study area includes Federal and Native onshore land and adjacent State offshore areas. A map showing the areal extent of each play was prepared by USGS geologists as a preliminary step in the assessment process. Boundaries were drawn on the basis of a variety of information, including seismic reflection data, results of exploration drilling, and regional patterns of rock properties. Play boundary polygons were captured by digitizing the play maps prepared by USGS geologists.2010年更新的国家石油资源评估（National Petroleum Resource Assessment，NPRA）基于勘探活动与科学研究获取的新地质数据，对全部24个油气区带逐一开展评估。其中11个油气区带的定量评估结果得到修订，剩余9个油气区带未作调整。上述20个油气区带的技术可采未发现石油与非伴生气资源量估算成果已在其他文献中公布（Houseknecht等，2010）。 本次NPRA评估的研究区域涵盖联邦所有、原住民所有的陆上地块，以及毗邻的州属近海区域。作为评估工作的前置步骤，美国地质调查局（United States Geological Survey，USGS）的地质人员编制了一张标注各油气区带空间分布范围的地图。区带边界的划定依据多类资料，包括地震反射数据、勘探钻井成果以及区域岩石物性分布规律。研究人员通过对USGS地质人员编制的油气区带地图进行数字化处理，提取得到了各油气区带的边界多边形矢量数据。