Geological Conditions of Hydrocarbon Accumulation in the South of Liaozhong Sag

Abstract

The south of Liaozhong sag is a hydrocarbon-rich area but lack of detailed study. This paper aims to analyze the geological conditions of pool forming in this area. Based on the geochemical and other geological data, it is known that source rocks of the study area are suggested to the third member of Dongying Formation and the whole Shahejie Formation. Reservoirs are allocated to the Guantao Formation and Minghuazhen Formation with middle to high permeability and high porosity. As for the caprock, it is considered to be the well-developed mudstones or shale of lower Ed, Es1 and Es3 Formation. There are two kinds of source-reservoir-caprock combinations, the lower generation to upper reservoir and self-generation to self-storage. In addition, the hydrocarbon reservoirs are mostly related to faults.