Characteristics of fault and its controlling to hydrocarbon accumulation in the yumin area, northern songliao basin

摘要

By using seismic, logging, test oil data, based on the analysis about development characteristics and movement stages of faults, and their control to the deposition of Fuyu oil layer, this paper studied the control of fault belts to hydrocarbon accumulation and characteristics of hydrocarbon migration and accumulation in different fault belts. Study shows that the faults of Fuyu oil layer are made up of middle and long-term faults, which are mainly formed or active in the early deposition of Qingshankou Formation, in a plane the faults are dense to be in belt by the control of basement fault. The distribution of sand bodies and strike of distributary channel of Fuyu oil layer is controlled by basement fault and long-term growth fault, there are three spatial combinations between fault belts and distributary channel : Low-angle intersection, High-angle intersection, and distributary channel's long-distance extension along the fault belt in the upside of the boundary fault. The spatial combinations between fault belts and sand bodies determine hydrocarbon migration way and its accumulation in the fault belts: in the eastern hydrocarbon is transported by "transporting fault-sand" mode, the traps within and besides the fault belt communicated by transporting passage are both accumulated by hydrocarbon, in the western hydrocarbon is transported by "boundary fault-sand" mode, the oiliness becomes gradually poor from both sides to the inter of fault belt.