东辛地区油气藏类型及其分布特征

本文以我国典型的复式油气聚集区--东营凹陷的东辛地区为例,主要分析了该区的油气藏类型及其分布特征。研究区油气藏类型以屋脊式断块油气藏为主体,在断块油气田中具有一定的代表性。沙三上-东营组油气藏,绝大多数为断块型;岩性和断层-岩性复合油气藏主要分布于沙三中下部,且油气藏类型与油气性质具有某种联系。下部沙三-沙二段为低饱和油藏,中部沙一段-东营组多为高饱和油藏及油气藏,浅部上第三系出现纯气藏。由深到浅依次出现油藏、油气藏、气藏的完整序列。断裂对于多层系、叠瓦式展布的油气藏的形成具有重要作用。 

OIL-GAS POOL TYPES AND THEIR DISTRIBUTION CHARACTERISTICS OF DONGXIN COMPLEX FAULT-BLOCK OIL & GAS FIELD

The oil-gas pool types and their occurrences in the largest fault block oil and gas field of China,Dongxin oil-gas field,are mainly discussed in the paper.The oil and gas pools can be divided into fault bolck,fault-nose,lithologic,and combining types of fault and lithologic ones,etc.,and fault-block pool is the most important among them.In the fault blocks,the multiple oil and gas pools,usually a few dozens,occurred vertically along fault as a superposition pattern.From the lower hydrocarbon-bearing horizons to the upper ones,oil pools,oil-gas pools and gas pools occur in turn.The distributions of oil and gas in different fault-blocks are uneven,and both flanks of the fault-anticline zone concentrated more oil and gas than other parts of the structure.Faults played an important role during the migration and accumulation of hydrocarbons,and it is the double parts both barriers and passways to fluid migration that formed multiple petroliferous horizons in Dongxin complex fault-block oil-gas field.