江汉盆地马王庙地区石油运移的探讨

ON THE OIL MIGRATION IN MAWANGMIAO REGION INJIANGHAN BASIN

从石油运移应用性研究出发探讨了马王庙地区原油产出的地质、地化特征和石油运移条件以及与石油运移有关的地球化学证据。本区在以古向斜的轴线为分界的石油运移聚集单元内,主要生油层系为下始新统新沟嘴组下段。该生油层系在向斜带内的上始新统潜四段沉积末期,古埋深超过成熟和排烃的深度(2100m),全部属于排烃范围,成为该区石油大量生成和运移的主要时期。石油运移的方向是由西南(高过剩压力的总口、吊堤口向斜带),向东北(低过剩压力的马王庙鼻状构造带)运移。

This paper deals mainly with the geology, geochemistry and oil migration conditions related to the oil occurence. The Lower Eocene lower Xingouzui formation is the maior source seauence in this oil migration and accumulation association. Within the syclinal belt, the depth of burial of the source sequence is over 2100 meters, a depth of over maturation and hydrocarbon drainage, at the end of the depositional time of the No.4 member in Late Eocene Qianjiang formation. In the synclinal belt, all the source sequence falls inside the limits of oil drainage, making this area an important period of oil maturation and migration occured on a large scale. The direction of oil migration is from Zhongkou to Mawangmiao nose of abnormally high pressure area in the southwest to Mawangmiao nose of abnormally low temperature area in the northeast successively.