Source-to-Sink System Fine Description and Petroleum Exploration Practice of the Northern Section of Liaoxi Low Uplift

The northern section of Liaoxi low uplift used to be regarded as a "forbidden zone" for exploration because it has been believed to be short of generation supply capacity and high-quality reservoirs as a result of its small existing provenance area. In order to determine the provenance features and distribution of reservoir of northern section of Liaoxi low uplift, drilling, logging and 3D seismic data are used for the fine description of the elements of Source-to-Sink system, including ancient provenance features, ancient valleys and slope break system in this study.In addition, the horizontal distribution of sand rich deposits is predicted, and the controlling factors of differential enrichment of sand were are discussed. It is found that the recessive provenance areas developed are distributed from south to north in a shape of several isolated archipelagos in the study area. What's more, two kinds of ancient valleys, namely, half filling type and erosion type, and 8 kinds of combination type of slope break zone also develop in the study area and several proximal sedimentary deposits are distributed around the provenance. The coupling relationship of Source-to-Sink plays a decisive role in the enrichment degree of sand bodies, among which the size and duration of provenance are the determining factors in the development of sand bodies. Furthermore, the fault activity and types of slope break further determine the difference of the enrichment degree of sand bodies in different positions. The study results have been applied in the discovery of Jinzhou 25-1 and Jinzhou 20-2N oil and gas fields.