USGS National and Global Oil and Gas Assessment Project—Los Angeles Basin Province: Assessment Unit Boundaries, Assessment Input Data, and Fact Sheet Data Tables

This data release contains the boundaries of assessment units and input data for the assessment of undiscovered conventional and continuous oil and gas resources in the Los Angeles Basin Province, California. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a set of known or postulated oil and (or) gas accumulations sharing similar geologic, geographic, and temporal properties within the Total Petroleum System, such as source rock, timing, migration pathways, trapping mechanism, and hydrocarbon type. The Assessment Unit boundary is defined geologically as the limits of the geologic elements that define the Assessment Unit, such as reservoir rock, geologic structures, source rock, and seal lithologies. The only exceptions to this are Assessment Units that border a Federal-State water boundary. In these cases, the Federal-State water boundary forms part of the Assessment Unit boundary. In addition to the shapefile, for U.S. assessments, allocation tables are provided that enumerate percentages assigned to various land categories. Machine-readable tables are also provided that contain the input and results for each assessment unit summarized in the USGS Fact Sheet. Methodology of assessments are documented in USGS Data Series 547 for continuous assessments (https://pubs.usgs.gov/ds/547) and USGS DDS69-D, Chapter 21 for conventional assessments (https://pubs.usgs.gov/dds/dds-069/dds-069-d/REPORTS/69_D_CH_21.pdf). See supplemental information for a detailed list of files included this data release.

本数据集发布内容包含美国加利福尼亚州洛杉矶盆地省未发现常规与连续型油气资源评价所需的评价单元（Assessment Unit）边界与输入数据。评价单元是美国国家油气资源评价项目中开展未发现油气资源评价的基本单元，需在更高层级的全油气系统（Total Petroleum System）框架下进行定义。本次发布的评价单元地理边界由负责该盆地省的地质人员解译、定义并绘制，其涵盖一系列在全油气系统内具备相似地质、地理与时间属性的已知或推测油气藏，包括烃源岩、成藏时序、运移路径、圈闭机制以及烃类类型等要素。评价单元边界在地质层面被定义为构成该单元的各类地质要素的分布范围，例如储集岩、地质构造、烃源岩与盖层岩性等。仅存在一类例外情况：当评价单元与联邦-州属水域边界接壤时，该联邦-州属水域边界将作为评价单元边界的组成部分。除矢量格式文件（shapefile）外，针对美国境内的评价工作，本数据集还提供了各类土地类别的占比分配表；同时附带机器可读表格，汇总了美国地质调查局（USGS）情况说明书中提及的每个评价单元的输入数据与评价结果。连续型油气资源评价方法详见USGS数据系列报告547（USGS Data Series 547），链接为https://pubs.usgs.gov/ds/547；常规油气资源评价方法详见USGS技术数据系列DDS69-D第21章，链接为https://pubs.usgs.gov/dds/dds-069/dds-069-d/REPORTS/69_D_CH_21.pdf。本数据集包含的全部文件明细，请参阅补充信息。