摘要
The mechanism of hydrocarbon migration and entrapment occurring in complex carbonate pore-fissure-fracture reservoirs is a key problem for effective hydrocarbon exploration and development of the lower part of an overlapped basin. The production, gas/oil ratio and the composition of crude oils and natural gas in the TZ83 Well block are high at the intersection point of the NE and NW-strike fault and decrease gradually along the ridge of the structure. A basic model of the pore-fissure-fracture system is built based on the achievements in the research on carbonate karstification. As a result, gas is enriched near the hydrocarbon injection point and drives away the oil which is enriched in compartments farther from the injection point, and the complex gas-oil-water relationship is controlled by the lateral connected networks.