东营凹陷压力系统与油气成藏

Pressure System and Oil / gas Reservoir Forming in Dongying Sag

东营凹陷作为中国东部最为典型的陆相富油断陷盆地之一,油气成藏具有油藏类型多样性、油气分布不均衡性、有序性、成藏环境差异性的特点。研究表明,东营凹陷古近系普遍存在异常高压。根据地层压力的纵横向分布特征将东营凹陷划分为深部超压系统、中部的过渡压力系统、浅部的常压系统。通过不同压力系统下油藏特征差异性的分析,建立了不同压力系统下的油气成藏模式,明确了压力结构的差异性决定油藏类型和分布的有序性。

Dongying Sag,as one of the most typical continental faulted-sag basin rich in oil in the eastern China,is characterized by diverse oil / gas reservoirs,uneven but orderly distribution of oil / gas and different environments for reservoir forming. Research indicates that abnormal pressure exists extensively in Paleogene,Dongying Sag. Based on the lateral and vertical distribution features of formation pressure,Dongying Sag can be divided into: over-pressure system in deep formation,transitional pressure system in mid-deep formation,and normal pressure system in shallow formation. Through analysis on difference of reservoir features under different pressure systems,the oil / gas reservoir-forming modes under different pressure systems have been established,the difference of pressure systems has been clarified and the reservoir type as well as distribution sequence has been identified.