Abstract: The migration of oil and gas in a multiple pay, multiple source rock, structurally complex, and extensively faulted region is very complicated. In such regions, a study of the compositions of carbon and hydrogen isotopes is one of the most effective techniques in the investigation of the direction of migration of oil and gas to determine the origin of the oil and gas in certain pay zones and its relation to the source rocks. Based on a correlation of the compositions of carbon and hydrogen isotopes from different source rocks in certain oil-and gas-bearing regions, this paper gives a conclusion that the oil and gas in reservoir Yan-10, Yian Formation in Baiyanjing Oil Fiell are originated from different source rocks. It is demonstrated that the crude oil is migrated from Yinchang Formation(source rock), while the solution gas is mainly originated from the coal-bearing Permian and Carboniferous Formations through migration. It points out also that the gas in Zhouzhuang Gas Reservoir is a thermal cracking gas originated from Funing Formation rather then biogenic gas originated from reservoir formation itself; and that the coaliferous gas accumulated in the coal bearing Xiangxi Group in Naxi Gas Field, Sichuan Province is petroliferous gas originated from the underneath Jialingjiang Formation rather than the coaliferous gas from the reservoir formation itself.

摘要： 在多产层、多源岩、构造复杂断层发育的油气区,油气运移是十分复杂的。在这样地区,研究油气的碳、氢同位素组成,是探索油气运移方向,确定某产层油气来自何源岩的最有效手段之一。本文根据有关油气区不同源岩形成油气的碳、氢同位素组成对比,确定了鄂尔多斯盆地摆宴井油田延安组延10油层中不同源的油气,石油是由延长组生成运移来的,其溶解气主要是由石炭二叠系含煤地层生成的煤成气运移来的;同时指出苏北盆地周庄气藏并非是自生自储的生化气,而是阜宁组生成的油型热解气;四川盆地纳溪气田香溪群含煤地层中产层聚集的煤成气不是自生自储,而主要是由下伏嘉陵江组生成油型气运移来的。