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中国东部中新生代断块区主要由八个含油气盆地近100个箕状断陷组成。由于地处大陆边缘,具有近海湖盆性质。自下而上发育晚侏罗世—早白垩世、古新世—始新世、渐新世三套生油层系,形成了三种成油剖面类型。有机母质类型以渐新统最好,古新统—始新统次之,上侏罗统—下白垩统相对较差。有机质的成熟度,由于生油母质类型的差别和埋藏时间与地温梯度的不一,在不同盆地中每个演化阶段的深度并不完全一致,石油窗厚度大致1450—1830米,埋深4000米以下,主要蕴藏天然气和凝析油。油源对比证实区内有两套油源层系。
The Mesozoic-Cenozoic fault block in eastern China consists mainly of nearly 100 half-graben faults in eight petroliferous basins. Because of its location on the edge of the mainland, it has the characteristics of offshore lake basin. From the bottom up, the three Jurassic-Early Cretaceous, Paleocene-Eocene and Oligocene oil-bearing formations developed three types of oil profiling. The organic parental types are the Oligocene, Paleocene-Eocene, and the Upper Jurassic to Lower Cretaceous are relatively poor. Organic matter maturity, due to the type of parent oil parent material and the difference between burial time and geothermal gradient, the depth of each evolution stage in different basins is not exactly the same, the thickness of the oil window is about 1450-1830 meters, the depth of 4000 meters The following, the main reservoir of natural gas and condensate. Comparison of oil sources confirmed that there are two sets of oil source zones in the area.