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含油气系统从识别、划分、描述到评价是一个完整的不可分割的整体，其最终目的是要对各系统进行比较，筛选出最有勘探前景的系统，并指出勘探方向。以歧口凹陷为例，根据石油地质、盆地模拟和地球化学的最新研究成果，揭示出歧口凹陷有两个含油气系统，即沙三含油气系统和沙一含油气系统，前者又可分为沙三－下第三系亚含油气系统和沙三－上第三系亚含油气系统。在此基础上，尝试以含油气系统为基本单元，分三个单元进行资源评价，综合评价表明歧口凹陷具有良好的勘探远景，并指出沙三含油气系统应是今后勘探的重点，其中沙三－下第三系亚含油气系统最具勘探前景，应特别注意加强该亚系统前第三系及其它层位的勘探。沙－含油气系统仍具有较好的勘探前景。
The ultimate goal of petroleum-oil-bearing system, from identification, division and description to evaluation, is to form a complete and indivisible whole. The ultimate goal of the system is to compare the systems and screen out the systems with the most exploration prospects and indicate the exploration directions. Taking Qikou depression as an example, according to the latest research results of petroleum geology, basin modeling and geochemistry, it is revealed that there are two petroleum-bearing systems in Qikou depression, that is, Shasan petroleum system and Sha1 petroleum system. The former can be divided into Sand III - Lower Tertiary Sub-system and Sand III - Upper Triassic sub-system. Based on this, we try to evaluate the resources in three units based on the petroleum system, and the comprehensive evaluation indicates that the Qikou sag has a good exploration prospect. It is pointed out that the Sha 3 oil and gas system should be the focus of exploration in the future. Thirdly, the Tertiary sub-petroliferous system has the most exploration prospect. Special attention should be paid to the exploration for strengthening the Tertiary and other strata before the sub-system. Sand-petroliferous systems still have good exploration prospects.