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中生代时期,在华南地区有许多孤立的地幔热源活动,它们对该区中生代地温场有很大的影响。古地温场对沉积层中有机质的热演变及成熟度,油气的运移及保存都有密切的关系。对我国南方海相碳酸盐岩进行含油气远景评价时,不仅要考虑其生油气的地化特征,还应把油气的保存条件列为重要因素来考虑,它要求成油期后地壳变动及上地壳沉积层受地幔热源活动的作用要弱一些。如含油层系地温高于250℃以上,对油气的保存均有不利的影响。由于中生代地温场的不均一性,华南地区古生代油气的保存是因地而异的,大致在雪峰山以西地区相对较好,东部地区相对较差。
During the Mesozoic, there were many isolated mantle thermal activities in southern China, which greatly influenced the Mesozoic geothermal field in this area. The paleotemperature field has a close relationship with the thermal evolution and maturity of organic matter in the sediments, the migration and preservation of oil and gas. When evaluating the hydrocarbon-bearing vistas of the marine carbonate rocks in southern China, we should consider not only the geochemical characteristics of hydrocarbon generation, but also the preservation conditions of hydrocarbons as an important factor. It requires that the crustal changes after oil formation and Upper crust deposits are less active by the mantle source. Such as oil-bearing geothermal above 250 ℃ above, the preservation of oil and gas have a negative impact. Due to the heterogeneity of geothermal field in the Mesozoic, the conservation of Paleozoic hydrocarbons in South China varies from place to place. Generally, the area west of Xuefeng Mountain is relatively good while the area in the east is relatively poor.