Abstract:

The east side of Huilu low uplift is Lufeng south hydrocarbon rich depression. In order to clarify the source and sedimentary reservoir distribution law on the east side of the low uplift, the research comprehensively uses the drilling and 3D seismic data to restore the ancient source area, describe the source to sink system elements, predict the plane distribution of sand rich sedimentary bodies, and discuss the control factors of sand body differential enrichment. The results show that Huilu low uplift develops a complete source and sink system controlled by paleogeomorphology. The lower Wenchang Formation of Paleogene in the study area can be further divided into eight uplift group units: A-H. On the basis of paleogeomorphology restoration, the eight uplift group units can be divided into 17 source and sink systems composed of independent watersheds and corresponding sedimentary areas. Among them, six independent source and sink systems composed of Watershed 1-6 are developed on the east side of Huilu low uplift, and Watershed  2, 4, and 6 have a large denudation range and denudation strength, and a large number of water systems, which are relatively concentrated. They are the main dominant source supply areas. The large denudation area, granite and volcanic rocks in Watershed 2 (eastern gentle slope of Lufeng 13 east sag) provide the material basis for the development of a large braided river delta and high quality reservoirs. The advantageous convergence of multiple water systems provides good development conditions for high-quality underwater distributary channel sandstone reservoirs.

Key words: Huilu low uplift, Lufeng depression, source and sink system, Early Wenchang Period, exploration practice