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通过系统测定塔东地区下古生界烃源层和储层中的固体沥青含量,进而估算了原油裂解气资源量。整体来看,塔东地区下古生界原始烃源岩曾具有巨大的生烃潜力,并且曾生成过大量原油。在区块上,单位面积固体沥青含量由西向东依次增高;在层位上,中寒武统(烃源层)含固体沥青最多;在期次上,以较早期生成的固体沥青为主,较晚期生成的固体沥青为次;在赋存空间(储集层与烃源层)上,绝大部分(87%)固体沥青均停留在烃源层中,储集层中固体沥青仅占固体沥青总量的13%。裂解生气量、裂解气资源量和固体沥青含量是密切相关的,它们的分布特征也与固体沥青相同,考虑固体沥青的形成期次,遴选适宜的聚集系数,最终计算塔东地区下古生界裂解气资源量为(2.18～4.37)×1012m3,表明塔东地区下古生界具有较好的天然气勘探潜力。
By measuring the content of solid bitumen in the Lower Paleozoic hydrocarbon source and reservoir in Tarong area, the amount of pyrolysis gas in crude oil was estimated. Overall, the Lower Paleozoic source rocks in the Tadong area had great potential for hydrocarbon generation and had produced large quantities of crude oil. In the block, the content of solid bitumen per unit area increases from west to east; in the horizon, the content of solid bitumen in the middle Cambrian (hydrocarbon source layer) is the highest; in the period, the solid bitumen is mainly produced in the earlier period, The later generation of solid bitumen was secondary. The vast majority (87%) of solid bitumen stayed in the hydrocarbon source layer in the reservoir space (reservoir and hydrocarbon source) and the solid bitumen in the reservoir accounted for only solid 13% of the total amount of asphalt. The amount of pyrolysis gas, pyrolysis gas resources and solid bitumen content are closely related, and their distribution characteristics are also the same as that of solid bitumen. Considering the formation period of solid bitumen, the suitable aggregation coefficient is selected, and finally the Lower Paleozoic The amount of pyrolysis gas resources is (2.18 ~ 4.37) × 1012m3, indicating that the Lower Paleozoic in the Tadong area has a good natural gas exploration potential.