临清坳陷德古2井油气成藏分析

Analysis of Reservoir Formation of Well Degu 2 in Linqing Depression

德古2井流体包裹体、天然气组分及碳同位素分析结果表明:①油气进入德古2井圈闭的时间是在沙三段—馆陶组沉积时期;②在烃源岩的低熟和成熟阶段早期,油气就开始运移、聚集于德古2井圈闭;③烃类气体主要来自于Ⅲ型干酪根的早期干酪根的裂解气,表现出的是低熟的煤成气特征,天然气成熟度R0约为0.8%。从油气运移角度分析并指出,德古2井获低产气流的主要原因是烃源岩生排烃能力低和储层储集性差。

The analysis results of fluid inclusion,gas components and carbon isotope of Well Degu 2 show that:①it is in the period of Es_3-Ng sedimentation when the petroleum accumulated to the trap of Well Degu 2;②the petroleum began to migrate and accumulate to the trap of Well Degu 2 when the source rock was in low maturity stage and early stage of maturity;③gaseous hydrocarbon which is characterized by low-maturity coal-eerived gas is mainly from the cracked gas of type Ⅲ kerogen in early time.The maturity of gas is 0.8% around.Analysed from the view of petroleum migration,it is pointed out that the main failure reason of Well Degu 2 is the poor capacity of hydrocarbon-generating and expulsion and the poor physical property of reservoir.